CN212082021U - High-efficient waste heat recovery sintering ignition system - Google Patents
High-efficient waste heat recovery sintering ignition system Download PDFInfo
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- CN212082021U CN212082021U CN202020213492.3U CN202020213492U CN212082021U CN 212082021 U CN212082021 U CN 212082021U CN 202020213492 U CN202020213492 U CN 202020213492U CN 212082021 U CN212082021 U CN 212082021U
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Abstract
An efficient waste heat recovery sintering ignition system, the system comprising: an ignition furnace and a flue preheating device; the flue preheating device is arranged on a flue of the sintering machine, and the flue gas of the flue of the sintering machine can completely pass through the flue preheating device; and combustion-supporting gas and/or fuel of the ignition furnace exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device. The technical scheme that this application provided can increase substantially waste heat recovery efficiency, improves sintering ignition stove combustion air and coal gas enthalpy, improves the ignition effect, reduces gas consumption, utilizes the waste heat volume that sintering process itself produced, reduces whole sintering process energy resource consumption, reduction in production cost.
Description
Technical Field
The utility model relates to a sintering ignition system, concretely relates to high-efficient waste heat recovery sintering ignition system belongs to mineral aggregate sintering processing technology field.
Background
The modern sintering process is a process of mixing various powdery iron-containing raw materials with a proper amount of fuel and flux, adding a proper amount of water, mixing and pelletizing, and then enabling the materials to generate a series of physical and chemical changes on sintering equipment to bond mineral powder particles into blocks, wherein a sintering machine is a main device in the air draft sintering process. The sintering ignition furnace is throat equipment for completing the sintering process, is positioned at the machine head part of the sintering machine, and is mainly used for igniting internal solid fuel in a mixture at a certain temperature and time and completing the sintering process of the mixture under the action of a main pump.
The existing sintering ignition technology can meet the ignition temperature requirement by using the traditional ignition technology (namely, normal temperature gas and normal temperature combustion air are directly ignited) when high and medium heat value gas (the heat value is about 5000KJ/Nm3 or more, such as coke oven gas, mixed gas, converter gas, generator gas and the like) is used as fuel. Many iron and steel enterprises do not have high-calorific value gas (coke oven gas) or the high-calorific value gas is insufficient, only low-calorific value gas (blast furnace gas) can be adopted for sintering ignition, and the requirement of ignition temperature can be ensured only by determining the mode of increasing the enthalpy of ignition combustion-supporting air and ignition gas.
Aiming at the problem, the traditional scheme adopts a mode of independently arranging a combustion furnace to preheat ignition combustion air and ignition coal gas for production. With the improvement of the process, the ignition of low calorific value gas, especially blast furnace gas, in the existing technical scheme mainly has the following problems: the preheating ignition type (air single preheating, air gas double preheating and the like) is adopted, and the ignition effect is ensured by consuming more heat sources, so that the method is not economical and environment-friendly; for the combustion-supporting ignition technology of taking hot air from the low-temperature section of the circular cooler, the air temperature is lower, and the ignition effect is difficult to improve for a large sintering machine; the hot air taken from the high-temperature section of the circular cooler affects the waste heat power generation of the circular cooler. Meanwhile, in the conventional mode of placing a conventional square box type heat exchanger in a flue, due to the structural form of the heat exchanger, the upper end and the lower end of the heat exchanger in the flue have the problem of wind cross short circuit, so that the heat exchange efficiency is low.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide an efficient waste heat recovery sintering ignition system capable of improving the waste heat recovery rate of a sintering machine and reducing the energy consumption.
SUMMERY OF THE UTILITY MODEL
The not enough to above-mentioned prior art, the utility model discloses an aim at sets up the flue through the complete interception in the sintering machine flue and preheats the heat exchanger, improves the waste heat recovery rate of sintering machine, reduces energy resource consumption. The utility model provides a high-efficient waste heat recovery sintering ignition system, this system includes: an ignition furnace and a flue preheating device; the flue preheating device is arranged on a flue of the sintering machine, and flue gas of the flue of the sintering machine passes through the flue preheating device; and combustion-supporting gas and/or fuel of the ignition furnace exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device.
According to the utility model discloses an embodiment provides a high-efficient waste heat recovery sintering ignition system:
an efficient waste heat recovery sintering ignition system, the system comprising: an ignition furnace and a flue preheating device; the flue preheating device is arranged on a flue of the sintering machine, and flue gas of the flue of the sintering machine passes through the flue preheating device; and combustion-supporting gas and/or fuel of the ignition furnace exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device.
Preferably, the flue preheating device includes: a heat exchange body; the heat exchange main body is arranged in a flue of the sintering machine, and combustion-supporting gas and/or fuel are introduced into the heat exchange main body.
Preferably, the heat exchange main body is a finned coil, and the overall appearance is a plate-shaped structure.
Preferably, the included angle A between the heat exchange main body and the flow direction of flue gas in the flue of the sintering machine is 0-90 degrees;
preferably, the included angle A between the heat exchange main body (201) and the flow direction of flue gas in the flue of the sintering machine is 90 degrees. The heat exchange area of the heat exchange main body (201) is equal to the cross-sectional area of the sintering machine flue.
Preferably, the ignition furnace includes: a furnace body, a fuel pipeline and a combustion-supporting gas pipeline; the fuel inlet of the furnace body is communicated with a fuel source through a fuel pipeline; the combustion-supporting gas inlet of the furnace body is communicated with a combustion-supporting gas source through a combustion-supporting gas pipeline; and the fuel pipeline and/or the combustion-supporting gas pipeline exchange heat with the flue of the sintering machine through the flue preheating device.
Preferably, the fuel source is coal gas, and the temperature Tm of the preheated coal gas is 80-300 ℃; the preferred Tm is 100-200 ℃; more preferably, the Tm is 130-150 ℃.
Preferably, the combustion-supporting gas source is air, and the temperature Tk after the air is preheated is 150-380 ℃; preferably, Tk is 200-300 ℃; more preferably, Tk is 220-280 ℃.
Preferably, the heat exchange between the combustion-supporting gas pipeline and the flue of the sintering machine through the flue preheating device is specifically as follows: the ignition furnace further comprises: the device comprises a first combustion-supporting gas pressure detector, a second combustion-supporting gas pressure detector, a first combustion-supporting gas fan, a first combustion-supporting gas temperature detector and a combustion-supporting gas flow detector; the combustion-supporting gas pipeline is divided into a combustion-supporting heat exchange front pipeline and a combustion-supporting heat exchange rear pipeline; the first combustion-supporting gas pressure detector and the first combustion-supporting gas fan are arranged on the combustion-supporting heat exchange front pipeline, and the first combustion-supporting gas pressure detector is positioned at the downstream of the first combustion-supporting gas fan; the second combustion-supporting gas pressure detector is arranged on the combustion-supporting heat exchange rear pipeline; the first combustion-supporting gas temperature detector is arranged on the combustion-supporting heat exchange rear pipeline, and the combustion-supporting gas flow detector is positioned at the downstream of the preheating device.
Preferably, the ignition furnace further comprises: the device comprises a combustion-supporting gas switching valve, a standby combustion-supporting gas pipeline, a standby combustion-supporting gas fan and a second combustion-supporting gas temperature detector; one end of the standby combustion-supporting gas pipeline is connected into the combustion-supporting gas pipeline through a combustion-supporting gas switching valve, and the other end of the standby combustion-supporting gas pipeline is communicated with a combustion-supporting gas source; the standby combustion-supporting gas fan is arranged on the standby combustion-supporting gas pipeline; the second combustion-supporting gas temperature detector is arranged on the combustion-supporting heat exchange rear pipeline and is positioned at the downstream of the combustion-supporting gas switching valve, and the first combustion-supporting gas temperature detector is positioned at the upstream of the combustion-supporting gas switching valve.
Preferably, the heat exchange between the fuel pipeline and the flue of the sintering machine through the flue preheating device is as follows: the ignition furnace further comprises: a first fuel pressure detector, a second fuel pressure detector, a first fuel flow detector, a first fuel temperature detector; the fuel pipeline is divided into a fuel heat exchange front pipeline and a fuel heat exchange rear pipeline; the first fuel pressure detector is arranged on the fuel heat exchange front pipeline and is positioned at the upstream of the preheating device; the second fuel pressure detector is arranged on the fuel heat exchange rear pipeline; the first fuel temperature detector is arranged on the fuel heat exchange pipeline.
Preferably, the ignition furnace further comprises: a fuel switching valve, a spare fuel pipeline and a spare fuel temperature detector; one end of the spare fuel pipeline is connected to the fuel pipeline through the fuel switching valve, and the other end of the spare fuel pipeline is communicated with a fuel source; the spare fuel temperature detector is arranged on the fuel heat exchange rear pipeline and is positioned at the downstream of the fuel switching valve.
The existing sintering ignition technology generally adopts a mode of additionally arranging a preheating furnace to meet the requirements of production technology, high-temperature flue gas generated by the preheating furnace is used for improving the enthalpy of ignition air and coal gas, so that the coal gas consumption is increased, the fixed investment is increased, and a conventional maintenance device is additionally arranged; by adopting the hot air ignition technology of the ring cooling machine, the ring cooling power generation can be interfered by heat taking due to the mature and stable process requirement of the ring cooling machine power generation technology, and the utilization efficiency of the ring cooling hot air is not improved.
The existing part of sintering plants adopt a mode of arranging a common serial single-group or multi-group common heat exchanger in a large flue for heat exchange, the heat exchanger can only partially occupy partial area of the section of the flue in the flue, the heat exchanger is simple in structure and low in heat exchange efficiency, the temperature after heat exchange can only reach more than 100 degrees, heat is dissipated along the way, and the actual combustion-supporting temperature is lower.
In this application, waste heat recovery sintering ignition system preheats the fuel or the combustion-supporting gas of ignition furnace through the waste heat that utilizes the sintering machine flue to increase the enthalpy of ignition furnace fuel or combustion-supporting gas, so that the heat and the temperature that produce after fuel and the combustion-supporting gas burning satisfy the production demand. And combustion-supporting gas and/or fuel of the ignition furnace exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device. The heat content of combustion air and coal gas of the sintering ignition furnace can be improved, the ignition effect is improved, the coal gas consumption is reduced, the energy consumption of the whole sintering process is reduced by utilizing the waste heat generated by the sintering process, and the production cost is reduced.
After the mineral aggregate enters the sintering machine, the mineral aggregate is ignited and combusted by the ignition furnace. The ignition furnace generally adopts high-calorific-value gas (coke oven gas) for igniting the pellet ore material, but some iron and steel enterprises do not have the coke oven gas and only can adopt low-calorific-value gas (blast furnace gas). And the combustion enthalpy of the low-heat value gas can not meet the process requirement. Therefore, low heating value gas (fuel) and/or combustion-supporting gas (air) need to be preheated, so that the enthalpy is increased, and the process requirements are met.
In this application, flue preheating device includes the heat transfer main part, and the heat transfer main part is coiled into the preheating device that whole shape is platelike structure by heat transfer pipeline according to certain mode of coiling. Certain space for smoke to pass through is formed between the heat exchange pipelines of the heat exchange main body, so that the resistance of the whole flue preheating device to the flow of sintering smoke in the flue of the sintering machine is reduced.
In the application, the included angle A between the heat exchange main body and the flue gas flowing direction in the flue of the sintering machine is 0-90 degrees, and the heat exchange area of the heat exchange main body is equal to the cross sectional area of the flue of the sintering machine, namely, flue gas passing through the flue preheating device in the flue of the sintering machine exchanges heat with the flue preheating device, so that the amount of flue gas participating in heat exchange is increased.
It should be noted that, in an embodiment of the present application, the flue preheating device includes: the heat exchange frame is arranged in the heat exchange frame, one end of the heat exchange frame is connected with the upstream flue, the other end of the heat exchange frame is connected with the downstream flue, namely, the heat exchange frame, the upstream flue and the lower oil smoke channel form a complete pipeline, so that smoke in the flue of the sintering machine can completely penetrate through the heat exchange frame, and the smoke volume participating in heat exchange is improved.
In this application, there are three ways that the ignition system can preheat the fuel or combustion gas of the ignition furnace. Firstly, preheating combustion-supporting gas only by a flue preheating device; secondly, preheating the fuel only through a flue preheating device; thirdly, preheating the fuel and the combustion-supporting gas by a flue preheating device. In the third case, the fuel and the combustion-supporting gas can be preheated separately by two flue preheating devices; the preheating can also be carried out by the same flue preheating device with double independent heat exchange tubes.
In the present application, the fuel and/or combustion-supporting gas is preheated to a specified temperature by means of a flue preheating device.
In this application, can accurately preheat the back to accuse combustion-supporting gas through flue preheating device through first combustion-supporting gas pressure detector, second combustion-supporting gas pressure detector, first combustion-supporting gas fan, first combustion-supporting gas temperature detector, the temperature and the atmospheric pressure state that reach. The temperature information of the preheated combustion-supporting gas is obtained, so that the enthalpy of the combustion-supporting gas can be ensured to reach a preset value, and the temperature of flame ignited by the ignition furnace is ensured to meet the process requirements. The air pressure information is acquired, whether high pressure or low pressure abnormity occurs in a pipeline related to combustion-supporting gas can be monitored in real time, and safety accidents are prevented.
In this application, ignition system still includes reserve combustion-supporting gas entry, and this reserve combustion-supporting gas does not preheat, through the combustion-supporting gas diverter valve, can adjust reserve combustion-supporting gas's the volume of adding to adjust the final combustion-supporting gas's that participates in the burning of entering ignition furnace temperature. When the smoke preheating device or the device related to the main combustion-supporting gas supply fails, the standby combustion-supporting gas can be independently started, so that insufficient combustion in the ignition furnace is prevented.
In the application, the temperature and the air pressure state reached after the fuel is preheated by the flue preheating device can be accurately controlled through the first fuel pressure detector, the second fuel pressure detector, the fuel flow meter and the first fuel temperature detector. The temperature information of the preheated fuel is obtained, the enthalpy of the fuel can reach a preset value, and the temperature of flame ignited by the ignition furnace is ensured to meet the technological requirements. The air pressure information is acquired, whether high pressure or low pressure abnormity occurs in a fuel-related pipeline can be monitored in real time, and safety accidents are prevented.
In this application, the ignition system further comprises a spare fuel inlet, the spare fuel is not preheated, and the adding amount of the spare fuel can be adjusted through the fuel switching valve, so that the temperature of the fuel finally entering the ignition furnace to participate in combustion is adjusted. When the flue gas preheating device breaks down, the standby fuel supply device can be independently started, so that the situation that the ignition furnace is stopped to cause unsmooth production is prevented.
The utility model discloses an aim at utilize sintering machine big flue afterbody bellows exhaust temperature for 300 give first chance to use 400 ℃ flue gas, cut original big flue whole section, high-efficient preheating device occupies whole flue cross sectional area, and the combustion-supporting wind temperature through high-efficient preheating device can reach 200 give first chance to use 300 ℃, and the coal gas temperature can reach 100 give first chance to use 200 ℃.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the technical scheme provided by the application can greatly improve the enthalpy of combustion air and coal gas of the sintering ignition furnace, improve the ignition effect and reduce the coal gas consumption;
2. according to the technical scheme, the temperature of the flue gas in the large flue can be reduced very little and is not lower than the dew point temperature through heat balance calculation;
3. the application provides a technical scheme's high-efficient preheating device has simple structure, equipment is light and handy, simple to operate, overhaul the cycle length, investment low grade advantage, to sintering process, the waste heat volume that can better utilization sintering process itself produced has very big benefit to reducing whole sintering process energy resource consumption.
Drawings
FIG. 1 is a schematic structural diagram of a preheating combustion-supporting gas of an efficient waste heat recovery sintering ignition system in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the preheating fuel of the high-efficiency waste heat recovery sintering ignition system in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of the present invention, in which the high-efficiency waste heat recovery sintering ignition system simultaneously preheats combustion-supporting gas and fuel;
fig. 4 is a main view structure diagram of a flue preheating device of a high-efficiency waste heat recovery sintering ignition system in the flue of a sintering machine in the embodiment of the present invention.
Reference numerals:
1: an ignition furnace; 101: a furnace body; 102: a first combustion supporting gas pressure detector; 103: a second combustion supporting gas pressure detector; 104: a first combustion supporting gas fan; 105: a first combustion supporting gas temperature detector; 106: a combustion-supporting gas switching valve; 107: a second combustion supporting gas fan; 108: a second combustion supporting gas temperature detector; 109: a first fuel pressure detector; 1010: a second fuel pressure detector; 1011: a fuel flow meter; 1012: a first fuel temperature detector; 1013: a fuel switching valve; 1014: a fuel switching valve; 1015: a backup fuel temperature detector; 1016: a combustion air flow rate detector; 2: a flue preheating device; 201: a heat exchange body; 202: a finned coil pipe;
l1: a fuel conduit; l101: a fuel heat exchange front pipeline; l102: a pipeline after heat exchange of the fuel; l2: a combustion supporting gas conduit; l201: a combustion-supporting heat exchange front pipeline; l202: a pipeline after combustion supporting and heat exchange; l3: a standby combustion-supporting gas pipeline; l4: a backup fuel line.
Detailed Description
According to the utility model discloses an embodiment provides a waste heat recovery sintering ignition system:
a waste heat recovery sintering ignition system, the system comprising: an ignition furnace 1 and a flue preheating device 2; the flue preheating device 2 is arranged on a flue 3 of the sintering machine, and flue gas of the flue of the sintering machine passes through the flue preheating device 2; and combustion-supporting gas and/or fuel of the ignition furnace 1 exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device 2.
Preferably, the flue gas preheating device 2 includes: a heat exchange body 201; combustion-supporting gas and/or fuel is introduced into the heat exchange main body 201; the heat exchange main body 201 is internally provided with a fin coil type 202, and the whole appearance is of a plate-shaped structure.
Preferably, the flue preheating device 2 further includes: a finned coil pipe;
preferably, the included angle A between the heat exchange main body 201 and the flow direction of flue gas in the flue of the sintering machine is 0-90 degrees;
preferably, the included angle a between the heat exchange main body 201 and the flue gas flowing direction in the flue of the sintering machine is 90 °. The heat exchange area of the heat exchange main body (201) is equal to the cross-sectional area of the sintering machine flue.
Preferably, the ignition furnace 1 includes: a furnace body 101, a fuel pipeline L1, and a combustion-supporting gas pipeline L2; the fuel inlet of the furnace body 101 is communicated with a fuel source through a fuel pipeline L1; a combustion-supporting gas inlet of the furnace body 101 is communicated with a combustion-supporting gas source through a combustion-supporting gas pipeline L2; the fuel pipeline L1 and/or the combustion-supporting gas pipeline L2 exchange heat with the flue of the sintering machine through the flue preheating device 2.
Preferably, the fuel source is coal gas, and the temperature Tm of the preheated coal gas is 80-300 ℃; the preferred Tm is 100-200 ℃; more preferably, the Tm is 130-150 ℃.
Preferably, the combustion-supporting gas source is air, and the temperature Tk after the air is preheated is 150-380 ℃; preferably, Tk is 200-300 ℃; more preferably, Tk is 220-280 ℃.
Preferably, the heat exchange between the combustion-supporting gas pipeline L2 and the sintering machine flue through the flue preheating device 2 is specifically as follows: the ignition furnace 1 further includes: a first combustion-supporting gas pressure detector 102, a second combustion-supporting gas pressure detector 103, a first combustion-supporting gas fan 104, a first combustion-supporting gas temperature detector 105, and a combustion-supporting gas flow rate detector 1016; the combustion-supporting gas pipeline L2 is divided into a combustion-supporting heat exchange front pipeline L201 and a combustion-supporting heat exchange rear pipeline L202; the first combustion-supporting gas pressure detector 102 and the first combustion-supporting gas fan 104 are arranged on a combustion-supporting heat exchange front pipeline L201, and the first combustion-supporting gas pressure detector 102 is positioned at the downstream of the first combustion-supporting gas fan 104; the second combustion-supporting gas pressure detector 103 is arranged on the combustion-supporting heat exchange rear pipeline L202; the first fuel temperature detector 1012 is arranged on the combustion-supporting heat exchange rear pipeline L202, and the combustion-supporting gas flow detector 1016 is positioned at the downstream of the preheating device.
Preferably, the ignition furnace 1 further includes: a combustion-supporting gas switching valve 106, a standby combustion-supporting gas pipeline L3, a second combustion-supporting gas fan 107, and a second combustion-supporting gas temperature detector 108; one end of a spare combustion-supporting gas pipeline L3 is connected to a combustion-supporting gas pipeline L2 through a combustion-supporting gas switching valve 106, and the other end of the spare combustion-supporting gas pipeline L3 is communicated with a combustion-supporting gas source; the second combustion-supporting gas blower 107 is provided on the spare combustion-supporting gas pipe L3; the second combustion supporting gas temperature detector 108 is disposed on the combustion supporting heat exchange rear pipe L202 and downstream of the combustion supporting gas switching valve 106, and the first combustion supporting gas temperature detector 105 is disposed upstream of the combustion supporting gas switching valve 106.
Preferably, the heat exchange between the fuel pipeline L1 and the sintering machine flue through the flue preheating device 2 is specifically as follows: the ignition furnace 1 further includes: a first fuel pressure detector 109, a second fuel pressure detector 1010, a fuel flow meter 1011, a first fuel temperature detector 1012; the fuel pipeline L1 is divided into a fuel heat exchange front pipeline L101 and a fuel heat exchange rear pipeline L102; the first fuel pressure detector 109 is arranged on the fuel heat exchange front pipeline L101; the second fuel pressure detector 1010 is arranged on the fuel heat exchange pipeline L102; a first fuel temperature detector 1012 is disposed on the post-fuel heat exchange pipe L102.
Preferably, the ignition furnace 1 further includes: fuel switching valve 1013, backup fuel pipe L4, fuel flow meter 1011, backup fuel temperature detector 1015; one end of a spare fuel pipeline L4 is connected into a fuel pipeline L1 through a fuel switching valve 1013, and the other end of the spare fuel pipeline L4 is communicated with a fuel source; a fuel flow meter 1011 is provided on the fuel pipe L102; backup fuel temperature detector 1015 is disposed on fuel after-heat-exchange conduit L102 downstream of fuel switching valve 1013.
Example 1
A waste heat recovery sintering ignition system, the system comprising: an ignition furnace 1 and a flue preheating device 2; the flue preheating device 2 is arranged on a flue of the sintering machine, and flue gas of the flue of the sintering machine passes through the flue preheating device 2; and combustion-supporting gas and/or fuel of the ignition furnace 1 exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device 2.
Example 2
Example 1 was repeated except that the flue preheating device 2 included: a heat exchange body 201; the heat exchange main body 201 is arranged on a flue of the sintering machine, and combustion-supporting gas and/or fuel are introduced into the heat exchange main body 201.
Example 3
Example 2 is repeated except that the heat exchange body 201 is a fin coil type and has a plate-like overall shape.
Example 4
The embodiment 3 is repeated, except that the included angle A between the heat exchange main body 201 and the flue gas flowing direction in the flue of the sintering machine is 90 degrees, and the heat exchange area of the heat exchange main body (201) is equal to the cross-sectional area of the flue of the sintering machine.
Example 5
Example 4 was repeated except that the ignition furnace 1 included: a furnace body 101, a fuel pipeline L1, and a combustion-supporting gas pipeline L2; the fuel inlet of the furnace body 101 is communicated with a fuel source through a fuel pipeline L1; a combustion-supporting gas inlet of the furnace body 101 is communicated with a combustion-supporting gas source through a combustion-supporting gas pipeline L2; the fuel pipeline L1 and/or the combustion-supporting gas pipeline L2 exchange heat with the flue of the sintering machine through the flue preheating device 2.
Example 6
Example 5 was repeated except that the fuel source was coal gas and the temperature Tm after preheating of the coal gas was 150 ℃.
Example 7
Example 5 was repeated, except that the source of the comburent gas was air, and the temperature Tk after preheating of the air was 250 ℃.
Example 8
The embodiment 5 is repeated, except that the heat exchange between the combustion-supporting gas pipeline L2 and the sintering machine flue through the flue preheating device 2 is specifically as follows: the ignition furnace 1 further includes: a first combustion-supporting gas pressure detector 102, a second combustion-supporting gas pressure detector 103, a first combustion-supporting gas fan 104, a first combustion-supporting gas temperature detector 105, and a combustion-supporting gas flow rate detector 1016; the combustion-supporting gas pipeline L2 is divided into a combustion-supporting heat exchange front pipeline L201 and a combustion-supporting heat exchange rear pipeline L202; the first combustion-supporting gas pressure detector 102 and the first combustion-supporting gas fan 104 are arranged on a combustion-supporting heat exchange front pipeline L201, and the first combustion-supporting gas pressure detector 102 is positioned at the downstream of the first combustion-supporting gas fan 104; the second combustion-supporting gas pressure detector 103 is arranged on the combustion-supporting heat exchange rear pipeline L202; the first combustion-supporting gas temperature detector 105 is arranged on the combustion-supporting heat exchange rear pipeline L202, and the combustion-supporting gas flow detector 1016 is positioned at the downstream of the preheating device.
Example 9
Example 8 was repeated except that the ignition furnace 1 further included: a combustion-supporting gas switching valve 106, a standby combustion-supporting gas pipeline L3, a standby combustion-supporting gas fan 107, and a second combustion-supporting gas temperature detector 108; one end of a spare combustion-supporting gas pipeline L3 is connected to a combustion-supporting gas pipeline L2 through a combustion-supporting gas switching valve 106, and the other end of the spare combustion-supporting gas pipeline L3 is communicated with a combustion-supporting gas source; the second combustion-supporting gas blower 107 is provided on the spare combustion-supporting gas pipe L3; the second combustion supporting gas temperature detector 108 is disposed on the combustion supporting heat exchange rear pipe L202 and downstream of the combustion supporting gas switching valve 106, and the first combustion supporting gas temperature detector 105 is disposed upstream of the combustion supporting gas switching valve 106.
Example 10
Example 5 is repeated, except that the heat exchange between the fuel pipeline L1 and the sintering machine flue through the flue preheating device 2 specifically comprises: the ignition furnace 1 further includes: a first fuel pressure detector 109, a second fuel pressure detector 1010, a fuel flow meter 1011, a first fuel temperature detector 1012; the fuel pipeline L1 is divided into a fuel heat exchange front pipeline L101 and a fuel heat exchange rear pipeline L102; the first fuel pressure detector 109 is arranged on the fuel heat exchange front pipeline L101; the second fuel pressure detector 1010 is arranged on the fuel heat exchange pipeline L102; a first fuel temperature detector 1012 is disposed on the post-fuel heat exchange pipe L102.
Example 11
Example 10 was repeated except that the ignition furnace 1 further included: fuel switching valve 1013, backup fuel line L4, backup fuel temperature detector 1015; one end of a spare fuel pipeline L4 is connected to a fuel pipeline L1 through a fuel switching valve 1013, and the other end of the spare fuel pipeline L4 is communicated with a fuel source; a fuel flow meter 1011 is provided on the fuel pipe L102; backup fuel temperature detector 1015 is disposed on fuel after-heat-exchange conduit L102 downstream of fuel switching valve 1013.
Use example 1
The high-efficiency energy-saving ignition furnace system of the sintering machine flue is 265m2The actual production of the sintering machine is taken as an example, the hourly output is 371t, the pressure of the blast furnace gas is 11.8KPa before modification, the temperature is normal temperature, and the gas consumption is 17800Nm3H, wherein the preheater consumes 3700Nm of gas3The temperature of a sintering machine flue is 145 ℃, and the ignition temperature is 1110 ℃; the pressure of the modified blast furnace gas is 11.9KPa, the temperature is normal temperature, and the gas consumption is 14000Nm3The temperature of a sintering machine flue is 140 ℃ and the ignition temperature is 1120 ℃. The flue preheating device can completely replace the preheating effect of the preheating furnace, and the coal gas consumption is reduced on the premise of meeting the process production conditions.
Claims (21)
1. The utility model provides a high-efficient waste heat recovery sintering ignition system which characterized in that: the system comprises: an ignition furnace (1) and a flue preheating device (2); the flue preheating device (2) is arranged on a sintering machine flue (3), and flue gas of the sintering machine flue passes through the flue preheating device (2); and combustion-supporting gas and/or fuel of the ignition furnace (1) exchanges heat with flue gas in a flue of the sintering machine through a flue preheating device (2).
2. The high efficiency heat recovery sintering ignition system of claim 1, wherein: the flue preheating device (2) comprises: a heat exchange body (201); the heat exchange main body (201) is arranged on a flue of the sintering machine, and combustion-supporting gas and/or fuel are introduced into the heat exchange main body (201).
3. The high efficiency heat recovery sintering ignition system of claim 2, wherein: the heat exchange main body (201) is internally provided with a fin coil type (202), and the whole appearance is of a plate-shaped structure.
4. The high efficiency waste heat recovery sintering ignition system of claim 2 or 3, wherein: the included angle A between the heat exchange main body (201) and the flow direction of flue gas in the flue of the sintering machine is 0-90 degrees, and the heat exchange area of the heat exchange main body (201) is equal to the cross sectional area of the flue of the sintering machine.
5. The high efficiency heat recovery sintering ignition system of any one of claims 1-3, wherein: the ignition furnace (1) comprises: a furnace body (101), a fuel pipeline (L1), and a combustion-supporting gas pipeline (L2);
the fuel inlet of the furnace body (101) is communicated with a fuel source through a fuel pipeline (L1);
a combustion-supporting gas inlet of the furnace body (101) is communicated with a combustion-supporting gas source through a combustion-supporting gas pipeline (L2);
the fuel pipeline (L1) and/or the combustion-supporting gas pipeline (L2) exchange heat with the flue of the sintering machine through the flue preheating device (2).
6. The high efficiency heat recovery sintering ignition system of claim 4, wherein: the ignition furnace (1) comprises: a furnace body (101), a fuel pipeline (L1), and a combustion-supporting gas pipeline (L2);
the fuel inlet of the furnace body (101) is communicated with a fuel source through a fuel pipeline (L1);
a combustion-supporting gas inlet of the furnace body (101) is communicated with a combustion-supporting gas source through a combustion-supporting gas pipeline (L2);
the fuel pipeline (L1) and/or the combustion-supporting gas pipeline (L2) exchange heat with the flue of the sintering machine through the flue preheating device (2).
7. The high efficiency heat recovery sintering ignition system of any one of claims 2-3, 6, wherein: the fuel source is coal gas, and the temperature Tm of the preheated coal gas is 80-300 ℃; and/or
The combustion-supporting gas source is air, and the temperature Tk after the air is preheated is 150-380 ℃.
8. The high efficiency heat recovery sintering ignition system of claim 4, wherein: the fuel source is coal gas, and the temperature Tm of the preheated coal gas is 80-300 ℃; and/or
The combustion-supporting gas source is air, and the temperature Tk after the air is preheated is 150-380 ℃.
9. The high efficiency heat recovery sintering ignition system of claim 5, wherein: the fuel source is coal gas, and the temperature Tm of the preheated coal gas is 80-300 ℃; and/or
The combustion-supporting gas source is air, and the temperature Tk after the air is preheated is 150-380 ℃.
10. The high efficiency heat recovery sintering ignition system of claim 7, wherein: the temperature Tm of the preheated coal gas is 100-200 ℃; and/or
The temperature Tk after air preheating is 200-300 ℃.
11. The high efficiency heat recovery sintering ignition system of claim 8 or 9, wherein: the temperature Tm of the preheated coal gas is 100-200 ℃; and/or
The temperature Tk after air preheating is 200-300 ℃.
12. The high efficiency heat recovery sintering ignition system of claim 10, wherein: the temperature Tm of the preheated coal gas is 130-150 ℃; and/or
The temperature Tk after air preheating is 220-280 ℃.
13. The high efficiency heat recovery sintering ignition system of claim 11, wherein: the temperature Tm of the preheated coal gas is 130-150 ℃; and/or
The temperature Tk after air preheating is 220-280 ℃.
14. The high efficiency heat recovery sintering ignition system of claim 5, wherein: the heat exchange between the combustion-supporting gas pipeline (L2) and the sintering machine flue through the flue preheating device (2) is as follows:
the ignition furnace (1) further comprises: a first combustion-supporting gas pressure detector (102), a second combustion-supporting gas pressure detector (103), a first combustion-supporting gas fan (104), a first combustion-supporting gas temperature detector (105) and a combustion-supporting gas flow detector (1016);
the combustion-supporting gas pipeline (L2) is divided into a combustion-supporting heat exchange front pipeline (L201) and a combustion-supporting heat exchange rear pipeline (L202);
a first combustion-supporting gas pressure detector (102) and a first combustion-supporting gas fan (104) are arranged on a combustion-supporting heat exchange front pipeline (L201), and the first combustion-supporting gas pressure detector (102) is positioned at the downstream of the first combustion-supporting gas fan (104);
the second combustion-supporting gas pressure detector (103) is arranged on the combustion-supporting heat exchange rear pipeline (L202); the first combustion-supporting gas temperature detector (105) is arranged on the combustion-supporting heat exchange rear pipeline (L202), and the combustion-supporting gas flow detector (1016) is positioned at the downstream of the preheating device (2).
15. The high efficiency heat recovery sintering ignition system of claim 6, wherein: the heat exchange between the combustion-supporting gas pipeline (L2) and the sintering machine flue through the flue preheating device (2) is as follows:
the ignition furnace (1) further comprises: a first combustion-supporting gas pressure detector (102), a second combustion-supporting gas pressure detector (103), a first combustion-supporting gas fan (104), a first combustion-supporting gas temperature detector (105) and a combustion-supporting gas flow detector (1016);
the combustion-supporting gas pipeline (L2) is divided into a combustion-supporting heat exchange front pipeline (L201) and a combustion-supporting heat exchange rear pipeline (L202);
a first combustion-supporting gas pressure detector (102) and a first combustion-supporting gas fan (104) are arranged on a combustion-supporting heat exchange front pipeline (L201), and the first combustion-supporting gas pressure detector (102) is positioned at the downstream of the first combustion-supporting gas fan (104);
the second combustion-supporting gas pressure detector (103) is arranged on the combustion-supporting heat exchange rear pipeline (L202); the first combustion-supporting gas temperature detector (105) is arranged on the combustion-supporting heat exchange rear pipeline (L202), and the combustion-supporting gas flow detector (1016) is positioned at the downstream of the preheating device (2).
16. The high efficiency heat recovery sintering ignition system of any one of claims 6, 14-15, wherein: the ignition furnace (1) further comprises: a combustion-supporting gas switching valve (106), a standby combustion-supporting gas pipeline (L3), a standby combustion-supporting gas fan (107) and a second combustion-supporting gas temperature detector (108);
one end of a standby combustion-supporting gas pipeline (L3) is connected into the combustion-supporting gas pipeline (L2) through a combustion-supporting gas switching valve (106), and the other end of the standby combustion-supporting gas pipeline (L3) is communicated with a combustion-supporting gas source; the second combustion-supporting gas fan (107) is arranged on the spare combustion-supporting gas pipeline (L3); the second combustion-supporting gas temperature detector (108) is arranged on the combustion-supporting heat exchange rear pipeline (L202) and is positioned at the downstream of the combustion-supporting gas switching valve (106), and the first combustion-supporting gas temperature detector (105) is positioned at the upstream of the combustion-supporting gas switching valve (106).
17. The high efficiency heat recovery sintering ignition system of claim 5, wherein: the ignition furnace (1) further comprises: a combustion-supporting gas switching valve (106), a standby combustion-supporting gas pipeline (L3), a standby combustion-supporting gas fan (107) and a second combustion-supporting gas temperature detector (108);
one end of a standby combustion-supporting gas pipeline (L3) is connected into the combustion-supporting gas pipeline (L2) through a combustion-supporting gas switching valve (106), and the other end of the standby combustion-supporting gas pipeline (L3) is communicated with a combustion-supporting gas source; the second combustion-supporting gas fan (107) is arranged on the spare combustion-supporting gas pipeline (L3); the second combustion-supporting gas temperature detector (108) is arranged on the combustion-supporting heat exchange rear pipeline (L202) and is positioned at the downstream of the combustion-supporting gas switching valve (106), and the first combustion-supporting gas temperature detector (105) is positioned at the upstream of the combustion-supporting gas switching valve (106).
18. The high efficiency heat recovery sintering ignition system of claim 5, wherein: the heat exchange between the fuel pipeline (L1) and the sintering machine flue through the flue preheating device (2) is as follows:
the ignition furnace (1) further comprises: a first fuel pressure detector (109), a second fuel pressure detector (1010), a fuel flow meter (1011), a first fuel temperature detector (1012);
the fuel pipeline (L1) is divided into a fuel heat exchange front pipeline (L101) and a fuel heat exchange rear pipeline (L102);
the first fuel pressure detector (109) is arranged on the fuel heat exchange front pipeline (L101), and the first fuel pressure detector (109) is positioned at the upstream of the preheating device (2);
the second fuel pressure detector (1010) is arranged on the fuel heat exchange pipeline (L102); a first fuel temperature detector (1012) is arranged on the fuel heat exchange rear pipeline (L102).
19. The high efficiency waste heat recovery sintering ignition system of any one of claims 6, 14-15, 17, wherein: the heat exchange between the fuel pipeline (L1) and the sintering machine flue through the flue preheating device (2) is as follows:
the ignition furnace (1) further comprises: a first fuel pressure detector (109), a second fuel pressure detector (1010), a fuel flow meter (1011), a first fuel temperature detector (1012);
the fuel pipeline (L1) is divided into a fuel heat exchange front pipeline (L101) and a fuel heat exchange rear pipeline (L102);
the first fuel pressure detector (109) is arranged on the fuel heat exchange front pipeline (L101), and the first fuel pressure detector (109) is positioned at the upstream of the preheating device (2);
the second fuel pressure detector (1010) is arranged on the fuel heat exchange pipeline (L102); a first fuel temperature detector (1012) is arranged on the fuel heat exchange rear pipeline (L102).
20. The high efficiency heat recovery sintering ignition system of claim 18, wherein: the ignition furnace (1) further comprises: a fuel switching valve (1013), a backup fuel line (L4), and a backup fuel temperature detector (1015);
one end of a spare fuel pipeline (L4) is connected into the fuel pipeline (L1) through a fuel switching valve (1013), and the other end of the spare fuel pipeline (L4) is communicated with a fuel source; the fuel flow meter (1011) is arranged on the first fuel pipeline (L1); a backup fuel temperature detector (1015) is provided on the fuel heat-exchanged pipe (L102) downstream of the fuel switching valve (1013).
21. The high efficiency heat recovery sintering ignition system of claim 19, wherein: the ignition furnace (1) further comprises: a fuel switching valve (1013), a backup fuel line (L4), and a backup fuel temperature detector (1015);
one end of a spare fuel pipeline (L4) is connected into the fuel pipeline (L1) through a fuel switching valve (1013), and the other end of the spare fuel pipeline (L4) is communicated with a fuel source; the fuel flow meter (1011) is arranged on the first fuel pipeline (L1); a backup fuel temperature detector (1015) is provided on the fuel heat-exchanged pipe (L102) downstream of the fuel switching valve (1013).
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| CN113824353A (en) * | 2021-08-18 | 2021-12-21 | 鞍钢股份有限公司 | Green temperature difference power generation device of sintering ignition furnace, use method and power generation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824353A (en) * | 2021-08-18 | 2021-12-21 | 鞍钢股份有限公司 | Green temperature difference power generation device of sintering ignition furnace, use method and power generation method |
| CN113824353B (en) * | 2021-08-18 | 2024-01-09 | 鞍钢股份有限公司 | Green color temperature difference power generation device of sintering ignition furnace, using method and power generation method |
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