CN212269983U - Coke oven coal charging flue gas purification system - Google Patents
Coke oven coal charging flue gas purification system Download PDFInfo
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- CN212269983U CN212269983U CN202021230160.2U CN202021230160U CN212269983U CN 212269983 U CN212269983 U CN 212269983U CN 202021230160 U CN202021230160 U CN 202021230160U CN 212269983 U CN212269983 U CN 212269983U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 239000003546 flue gas Substances 0.000 title claims abstract description 188
- 238000000746 purification Methods 0.000 title claims abstract description 133
- 239000000571 coke Substances 0.000 title claims abstract description 87
- 239000003245 coal Substances 0.000 title claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 96
- 238000001179 sorption measurement Methods 0.000 claims abstract description 82
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- 238000011084 recovery Methods 0.000 claims abstract description 29
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Abstract
The utility model relates to a coke oven coal-charging flue gas purification system, this coke oven coal-charging flue gas purification system includes coal-charging dust collector, gas heat exchanger, adsorb purifier, regenerative heater and sulphur recovery unit, coal-charging dust collector's air inlet is used for the coal-charging jogged joint with the coke oven, coal-charging dust collector's gas outlet is connected with gas heat exchanger's air inlet, gas heat exchanger's first gas outlet is connected with the air inlet that adsorbs purifier, gas heat exchanger's second gas outlet is connected with regenerative heater's air inlet, regenerative heater's gas outlet is connected with adsorption purifier's air inlet, adsorption purifier's return air inlet is connected with gas heat exchanger's air inlet, adsorption purifier's gas outlet is connected with sulphur recovery unit's air inlet. The utility model solves the technical problems of poor system operation stability and poor purifying effect of pollutants such as sulfide in the coal charging process of the coke oven.
Description
Technical Field
The utility model relates to a flue gas treatment field especially relates to a coke oven coal-charging flue gas purification system.
Background
With the rapid development of the steel industry, the usage amount of the coking coal is greatly improved. A large amount of sulfur dioxide and smoke dust generated in the coking process become important sources of air pollution, a large amount of smoke gas escapes from a coal charging hole in the coal charging operation process of the coke oven, pollutants are discharged in a burst mode along with the coal charging operation, the pollutants discharged to the outside in the coal charging process account for 50-60% of the total pollutants discharged in the coking process, and the pollutants contain a large amount of dust and sulfides.
The existing method for purifying the coke oven coal-charging flue gas can remove most of dust in the pollutants discharged to the outside in the coal charging process by arranging the ground dust removal station, but cannot effectively remove the pollutants such as sulfide in the flue gas, so that the coke oven coal-charging flue gas is discharged in an overproof manner. Therefore, before entering the atmosphere, the coke oven coal-charging flue gas not only needs to remove dust in the flue gas, but also needs to be further purified to remove pollutants such as sulfide carried in the flue gas.
At present, most of coke oven coal-charging flue gas of comprehensive iron and steel plants and independent coke plants is treated by a ground dust removal station, part of dust is removed, and then the flue gas is directly discharged into the atmosphere, and a small number of enterprises adopt wet desulphurization or semi-dry desulphurization technology to further treat the flue gas after dust removal, so that the above methods cannot ensure that the flue gas reaches the standard and is discharged. Mainly due to the following reasons: the method comprises the following steps that firstly, the coal charging process of the coke oven belongs to intermittent operation, the coal charging flue gas of the coke oven is emitted in a burst manner, so that the fluctuation of the gas flow of the flue gas is large, and the fluctuation of the content of impurities such as sulfide in the flue gas in different periods is also large, so that the wet method and semi-dry method desulfurization technology is adopted, a control system needs to be frequently adjusted to deal with the fluctuation of the gas flow and the impurities in the flue gas, the steady-state operation of the system is not facilitated, the energy consumption is large, the scale; secondly, because the content of impurities such as sulfide in the coal charging flue gas of the coke oven is influenced by the quality of the coal to be charged, when different batches of coal are used for coking operation, the concentration difference of the impurities such as sulfide in the coal charging flue gas is large, so the existing operation system and the consumption of energy media need to be readjusted, a large amount of secondary pollution can be generated, and the stable operation and the operation of the system are not facilitated.
Aiming at the problems of poor system operation stability and poor purifying effect of pollutants such as sulfide and the like in the coal charging process of a coke oven in the related technology, no effective solution is provided at present.
Therefore, the inventor provides a coke oven coal-charging flue gas purification system by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coke oven coal-charging flue gas purification system, take the flue gas dust removal through coke oven coal-charging flue gas, the pressurization of flue gas fan, the heat transfer cooling, cooling and absorption purification treatment, pollutants such as sulphide in the effective desorption coke oven coal-charging flue gas, the flue gas after the purification passes through the chimney and emits into the atmosphere, and through to the absorbent regeneration operation of desulfurization, the assurance system can circulate, stable operation, and carry out subsequent processing to substances such as sulphide in the gas after regeneration, better solution system operation stability poor, the not good problem of pollutant purifying effect such as sulphide, can be used to the production and the purification of coke oven coal-charging flue gas.
The purpose of the utility model can be realized by adopting the following technical scheme:
the utility model provides a coke oven coal charging flue gas purification system, coke oven coal charging flue gas purification system includes coal charging dust collector, gas heater, adsorbs purifier, regenerative heater and sulphur recovery unit, wherein:
the gas inlet of the coal charging and dust removing device is used for being connected with a coal charging hole of the coke oven, the gas outlet of the coal charging and dust removing device is connected with the gas inlet of the flue gas heat exchanger, the first gas outlet of the flue gas heat exchanger is connected with the gas inlet of the adsorption and purification device, the second gas outlet of the flue gas heat exchanger is connected with the gas inlet of the regeneration heater, the gas outlet of the regeneration heater is connected with the gas inlet of the adsorption and purification device, the gas return port of the adsorption and purification device is connected with the gas inlet of the flue gas heat exchanger, and the gas outlet of the adsorption and purification device is connected with the gas inlet of the sulfur recovery.
The utility model discloses an in a preferred embodiment, coke oven coal-charging flue gas purification system still includes the flue gas cooler, the flue gas cooler set up in flue gas heat exchanger with adsorb between the purifier, flue gas cooler's air inlet with flue gas heat exchanger's first gas outlet is connected, flue gas cooler's gas outlet with adsorb purifier's air inlet and connect.
The utility model discloses an in a preferred embodiment, coal-charging dust collector with be provided with the flue gas fan between the gas heater, the air inlet of flue gas fan with coal-charging dust collector's gas outlet is connected, the gas outlet of flue gas fan with gas heater's air inlet is connected.
The utility model discloses an in a preferred embodiment, adsorb purifier with be provided with the regeneration fan between the sulphur recovery unit, the air inlet of regeneration fan with adsorb purifier's gas outlet and connect, the gas outlet of regeneration fan with adsorb purifier's air inlet and connect.
In a preferred embodiment of the present invention, the third gas outlet of the flue gas heat exchanger is connected to the chimney.
In a preferred embodiment of the present invention, the coal charging dust removing device is a coke oven coal charging ground dust removing station and its supporting facilities.
In a preferred embodiment of the present invention, the flue gas heat exchanger is an indirect heat exchanger.
In a preferred embodiment of the present invention, the adsorption purification apparatus is a plurality of adsorption purification towers, each of which is connected in parallel, and each of which is provided with an adsorbent capable of being recycled and reused.
In a preferred embodiment of the present invention, the adsorbent is microcrystalline material, molecular sieve or activated carbon.
In a preferred embodiment of the present invention, at least one of the adsorption and purification towers is a spare adsorption and purification tower.
In a preferred embodiment of the present invention, the regenerative heater is a steam heater or an electric heater.
In a preferred embodiment of the present invention, the sulfur recovery device is an acid production plant or a salt production plant.
From the above, the utility model discloses a coke oven coal-charging flue gas purification system's characteristics and advantage are: the air inlet of the coal-charging dust removal device is connected with the coal-charging hole of the coke oven, and the coal-charging dust removal device filters dust contained in the coal-charging flue gas, so that the effect of preliminarily purifying the coal-charging flue gas is achieved. In addition, the gas outlet of the coal-charging dust removal device is connected with the gas inlet of the adsorption purification device through the flue gas heat exchanger, pollutants such as sulfide and the like contained in the coal-charging flue gas can be adsorbed and removed through the adsorption purification device, the standard emission of the coal-charging flue gas of the coke oven is realized, the flue gas heat exchanger is connected with the gas inlet of the adsorption purification device through the regenerative heater, the gas return port of the adsorption purification device is connected with the gas inlet of the flue gas heat exchanger, the adsorbent in an adsorption saturation state in the adsorption purification device can be regenerated through heating, the purified flue gas is used as the regeneration gas in the regeneration process of the adsorbent, the regeneration gas is not required to be introduced from the outside, the reduction emission of the pollution gas can be realized, the regenerated adsorbent can continuously adsorb and remove the pollutants such as the sulfide and the like contained in the coal-charging flue gas, stable operation reduces secondary pollution simultaneously and discharges, because the gas outlet of adsorbing purifier is connected with sulfur recovery unit's air inlet, the sulphide accessible sulfur recovery unit of desorption carries out subsequent processing from the adsorbent, reaches the abundant purification to pollutants such as sulphide in the coal-charging flue gas. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: is a structural block diagram of a first embodiment in the coal charging flue gas purification system of the coke oven.
FIG. 2: is a structural block diagram of a second embodiment in the coal-charging flue gas purification system of the coke oven.
FIG. 3: is a structural block diagram of a third embodiment in the coal-charging flue gas purification system of the coke oven.
FIG. 4: is a structural block diagram of a fourth embodiment in the coal charging flue gas purification system of the coke oven.
FIG. 5: is a structural block diagram of a fifth embodiment in the coal charging flue gas purification system of the coke oven.
FIG. 6: is a process flow block diagram of the coke oven coal charging flue gas purification system.
The utility model provides an reference numeral does:
1. a coke oven; 2. A coal charging dust removal device;
3. a flue gas fan; 4. A flue gas heat exchanger;
5. a flue gas cooler; 6. An adsorption purification device;
7. a regenerative heater; 8. A regenerative fan;
9. a chimney; 10. A sulfur recovery unit.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
Example one
As shown in figure 1, the utility model provides a coke oven coal charging flue gas purification system, this coke oven coal charging flue gas purification system include coal charging dust collector 2, gas heat exchanger 4, adsorb purifier 6, regenerative heater 7 and sulphur recovery unit 10, wherein: the air inlet of the coal charging and dust removing device 2 is used for being connected with the coal charging hole of the coke oven 1, the air outlet of the coal charging and dust removing device 2 is connected with the air inlet of the flue gas heat exchanger 4, the first air outlet of the flue gas heat exchanger 4 is connected with the air inlet of the adsorption and purification device 6, the second air outlet of the flue gas heat exchanger 4 is connected with the air inlet of the regenerative heater 7, the air outlet of the regenerative heater 7 is connected with the air inlet of the adsorption and purification device 6, the air return port of the adsorption and purification device 6 is connected with the air inlet of the flue gas heat exchanger 4, and the air outlet of the adsorption and purification.
The utility model discloses well coal-charging dust collector 2's air inlet and coke oven 1's coal-charging jogged joint carry out the filtering through coal-charging dust collector 2 to the dust that contains in the coal-charging flue gas, reach the effect to the preliminary purification of coal-charging flue gas. In addition, the gas outlet of the coal-charging dust-removing device 2 is connected with the gas inlet of the adsorption and purification device 6 through the flue gas heat exchanger 4, pollutants such as sulfide and the like contained in the coal-charging flue gas can be adsorbed and removed through the adsorption and purification device 6, the standard discharge of the coal-charging flue gas of the coke oven is realized, the flue gas heat exchanger 4 is connected with the gas inlet of the adsorption and purification device 6 through the regenerative heater 7, the gas return port of the adsorption and purification device 6 is connected with the gas inlet of the flue gas heat exchanger 4, the adsorbent in the adsorption and purification device 6 in the adsorption and purification state can be regenerated through heating, in the regeneration process of the adsorbent, the purified flue gas is used as the regeneration gas, the regeneration gas is not required to be introduced from the outside, the reduction and discharge of the pollution gas can be realized, and the regenerated adsorbent can continuously adsorb and remove the pollutants such, the system can be ensured to operate circularly and stably, and the secondary pollution emission is reduced simultaneously, because the gas outlet of the adsorption and purification device 6 is connected with the gas inlet of the sulfur recovery device 10, the sulfide desorbed from the adsorbent can be subjected to subsequent treatment through the sulfur recovery device 10, and the full purification of pollutants such as sulfide in the coal-charging flue gas is achieved. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
In an optional embodiment of the present invention, as shown in fig. 2, the coke oven coal-charging flue gas purification system further includes a flue gas cooler 5, the flue gas cooler 5 is disposed between the flue gas heat exchanger 4 and the adsorption purification device 6, an air inlet of the flue gas cooler 5 is connected to the first air outlet of the flue gas heat exchanger 4, and an air outlet of the flue gas cooler 5 is connected to the air inlet of the adsorption purification device 6. The coal-charging flue gas passing through the flue gas heat exchanger 4 is further cooled by the flue gas cooler 5, so that sulfides contained in the coal-charging flue gas can be fully adsorbed by the adsorbent after entering the adsorption and purification device 6.
In an optional embodiment of the utility model, as shown in fig. 3, be provided with flue gas fan 3 between coal-charging dust collector 2 and the gas heater 4, flue gas fan 3's air inlet and coal-charging dust collector 2's gas outlet are connected, and flue gas fan 3's gas outlet is connected with gas heater 4's air inlet. The coal-charging flue gas passing through the coal-charging dust removal device 2 is pressurized by the flue gas fan 3, and the coal-charging flue gas can be enabled to completely enter the flue gas heat exchanger 4.
In an optional embodiment of the present invention, as shown in fig. 4, a regeneration fan 8 is disposed between the adsorption and purification device 6 and the sulfur recovery device 10, an air inlet of the regeneration fan 8 is connected to an air outlet of the adsorption and purification device 6, and an air outlet of the regeneration fan 8 is connected to an air inlet of the adsorption and purification device 6. Pressurize the sulphur gas who follows desorption among the adsorption purification device 6 through regeneration blower 8, guarantee that sulphur gas can all enter into to sulphur recovery unit 10 in for can fully get rid of sulphur gas.
In an alternative embodiment of the present invention, as shown in fig. 5, the third gas outlet of the flue gas heat exchanger 4 is connected to the chimney 9. The low-temperature coal-charging flue gas in the adsorption and purification device 6 from which the sulfide is removed by the adsorbent returns to the flue gas heat exchanger 4 through the air return port of the adsorption and purification device 6 to be used as a heat exchange medium, and can be directly discharged to the outside through the chimney 9 after exchanging heat with the coal-charging flue gas to be treated.
Further, the coal charging dust removal device 2 is composed of a coke oven coal charging ground dust removal station and supporting facilities thereof, and comprises a motor, a fan, a dust collecting main pipe, a bag-type dust remover, a flue gas adsorption device, a humidifying dust unloading machine and other equipment, so that dust in the coal charging flue gas can be filtered.
Further, the flue gas heat exchanger 4 is an indirect heat exchanger.
Furthermore, the adsorption purification device 6 is composed of 2 to 12 adsorption purification towers, all the adsorption purification towers are connected in parallel, an adsorbent capable of being recycled and regenerated is arranged in each adsorption purification tower, and each adsorption purification tower can be used for independently adsorbing and removing pollutants such as sulfide contained in the coal-charging flue gas.
In the utility model provides an optional embodiment, the adsorbent is microcrystalline material, molecular sieve or active carbon, and the adsorbent can adsorb pollutants such as sulphide that the coal-charging flue gas contains, and the adsorbent can carry out desorption regeneration to pollutants such as sulphide after rising temperature.
Specifically, a microcrystalline materialThe material can be made of material containing at least one element of magnesium, calcium, strontium, yttrium, lanthanum, cerium, europium, iron, cobalt, nickel, copper, silver, zinc and the like; specifically, the microcrystalline material is selected from at least one of X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, beta-type molecular sieve, MCM-type molecular sieve and SAPO-type molecular sieve, wherein the catalyst for converting organic sulfur into inorganic sulfur comprises Fe-Co-Mn-Mo-Ni catalyst, CO-K-Al catalyst2O3、ZrO2/TiO2At least one of catalysts; and in practical implementation, the amount of the catalyst can be reasonably set by a person skilled in the art according to the field operation requirement. Wherein, the microcrystal material has stronger adsorption capacity at the temperature of 20-80 ℃, can be desorbed and regenerated at the temperature of 160-350 ℃, and the adsorbed organic sulfur is catalytically converted into inorganic sulfur in situ during regeneration.
Furthermore, at least one of the adsorption purification towers is a standby adsorption purification tower.
Further, the regenerative heater 7 may be, but is not limited to, a steam heater or an electric heater.
Further, the sulfur recovery device 10 is a sulfuric acid production facility or a sulfate production facility, and can react with pollutants such as sulfide introduced into the sulfur recovery device 10.
Example two
As shown in FIG. 6, the process flow of the coke oven coal charging flue gas purification system of the present invention comprises the following steps:
step S1: the coal charging flue gas of the coke oven escapes from a coal charging hole of the coke oven 1 and forms a first air flow, the first air flow is discharged in a burst manner, and the flow rate of the first air flow and the concentration of pollutants such as dust, sulfide and the like in the first air flow show larger fluctuation in the coal charging process and the coal charging intermittent process.
Step S2: the first air flow enters the coal charging dust removal device 2, the coal charging dust removal device 2 generally comprises a coke oven coal charging ground dust removal station and matched equipment, the coal charging dust removal device 2 removes most of dust contained in the first air flow and forms a second air flow, the temperature of the second air flow is 40-120 ℃, and the temperature of the second air flow is in the second air flowThe sulfide content was 10mg/m3To 120mg/m3The dust content in the second gas stream was 0.01mg/m3To 20mg/m3。
Step S3: the second air flow enters the flue gas heat exchanger 4, the second air flow and the medium in the flue gas heat exchanger 4 exchange heat and cool, a third air flow is formed, and the flue gas heat exchanger 4 generally adopts indirect heat exchange.
Step S4: the third air flow enters an adsorption purification device 6, and an adsorbent in the adsorption purification device 6 adsorbs sulfides contained in the third air flow to form a fourth air flow; the adsorption purification device 6 generally comprises 2 to 12 adsorption purification towers, wherein at least 1 adsorption purification tower is in a standby or regeneration state; each adsorption purification tower in the adsorption purification device 6 is filled with an adsorbent, the adsorbent can be selected from microcrystalline materials, molecular sieves, activated carbon and other materials which have good adsorption performance and can be recycled, the adsorbent filled in each adsorption purification tower can be saturated after adsorption purification operation for 5 to 25 days, the saturated adsorbent can be subjected to regeneration desorption through temperature rise, and the adsorbent subjected to regeneration desorption can be recycled.
Step S5: the fourth airflow flows back to the flue gas heat exchanger 4 to be used as a medium in the step S3 to exchange heat with the second airflow and raise the temperature, and a fifth airflow is formed; at this time, the second airflow is a high-temperature side airflow, the fourth airflow is a low-temperature side airflow, the temperature of the second airflow and the fourth airflow is reduced after heat exchange is performed in the flue gas heat exchanger 4, and the temperature of the fourth airflow is increased and sent to the regenerative heater 7.
Step S6: and (3) enabling a part of the fifth airflow to enter the regenerative heater 7, directly discharging the other part of the fifth airflow to the outside through a chimney 9, further heating the fifth airflow by the regenerative heater 7, wherein the regenerative heater 7 can adopt a medium-low pressure steam or electric heating mode and the like so as to enable the temperature of the fifth airflow to reach the temperature for regenerating the adsorbent in the adsorption saturation state in the step S4 and form a sixth airflow, and the temperature of the sixth airflow is 160-260 ℃.
Step S7: the sixth gas flow enters the adsorption purification device 6 to regenerate the adsorbent which reaches the adsorption saturation state, and the regenerated sulfur-containing gas is discharged from the adsorption purification device 6 to form a seventh gas flow;
step S8: and the seventh gas flow enters the sulfur recovery device 10, and the materials in the sulfur recovery device 10 react with the sulfur-containing gas to perform acid making or salt making treatment, so that the impurities such as sulfide and the like carried in the seventh gas flow are subjected to resource recovery.
In an optional embodiment of the present invention, the second airflow in step S2 enters the flue gas heat exchanger 4 in step S3 after being pressurized by the flue gas blower 3. The pressure after the pressurization of the flue gas fan 3 is 3kPa to 10kPa (gauge pressure), and the flue gas fan 3 can carry out frequency conversion adjustment according to the actual output quantity of the second airflow.
In an optional embodiment of the present invention, the third air flow in step S3 is cooled by the flue gas cooler 5 and enters the adsorption purification apparatus 6 in step S4. The flue gas cooler 5 can adopt circulating water or cooling water as a cold source to indirectly cool the third air flow, and the temperature of the cooled third air flow is 40-80 ℃.
In an optional embodiment of the present invention, the seventh air stream in the step S7 is pressurized by the regeneration fan 8 and then enters the sulfur recovery device 10 in the step S8, so as to ensure sufficient recovery of the seventh air stream.
The utility model discloses a coke oven coal-charging flue gas purification system's characteristics and advantage are:
the coke oven coal-charging flue gas purification system filters dust contained in coal-charging flue gas through the coal-charging dust removal device 2 to achieve the effect of primarily purifying the coal-charging flue gas, pollutants such as sulfide contained in the coal-charging flue gas can be adsorbed and removed through the adsorption purification device 6 to achieve standard emission of the coke oven coal-charging flue gas, an adsorbent in an adsorption saturation state in the adsorption purification device 6 can be regenerated through heating, in the regeneration process of the adsorbent, purified flue gas is used as regeneration gas, the introduction of the regeneration gas from the outside is not needed, the consumption of energy media is reduced, the reduction emission of pollution gas can be achieved, the regenerated adsorbent can continuously adsorb and remove the pollutants such as sulfide contained in the coal-charging flue gas, the system can be ensured to operate circularly and stably, meanwhile, the secondary pollution emission is reduced, and the sulfide desorbed from the adsorbent can be subjected to subsequent treatment through the sulfur recovery device 10, the full purification of pollutants such as sulfide in the coal-charging flue gas is achieved, and the standard emission of the flue gas is realized. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
Secondly, the adsorption and purification device 6 is additionally arranged behind the coal-charging dust removal device 2, so that pollutants such as sulfide in the coal-charging flue gas of the coke oven can be removed, and the standard emission of the coal-charging flue gas of the coke oven can be realized.
By using the coke oven coal-charging flue gas purification system, even under the condition that the intermittent discharge of the coal-charging flue gas is caused by the intermittent operation in the coke oven coal-charging process, the purification system does not need to be frequently adjusted to adapt to the intermittent discharge, and the long-time steady-state operation and operation of the purification system can be realized.
By using the coke oven coal-charging flue gas purification system, even under the condition of large fluctuation of impurity concentrations of sulfides and the like in coal-charging flue gas caused by intermittent operation in the coke oven coal-charging process, the purification system does not need to be frequently adjusted to adapt to paroxysmal discharge, and long-time steady-state operation and operation of the purification system can be realized.
By using the coke oven coal-charging flue gas purification system, even if different coal qualities are adopted for charging in the coke oven coal charging process, the concentration of impurities such as sulfide in the coal-charging flue gas is changed, the purification system does not need to be frequently adjusted to adapt to the paroxysmal discharge of the impurities, and the long-time steady-state operation and operation of the purification system can be realized.
Sixth, this coke oven coal-charging flue gas purification system carries out cold, hot flue gas heat transfer through gas heat exchanger 4 in the coke oven coal-charging flue gas purification process, can realize the preliminary cooling of hot flue gas and the preliminary intensification of cold flue gas, can reduce the energy medium consumption in subsequent cooling and intensification process by a wide margin, has also realized the thermal reasonable recovery and utilization of system.
Seventh, this coke oven coal-charging flue gas purification system is in coke oven coal-charging flue gas purification process, through filling in the adsorbent purifying tower that can regenerate the used repeatedly adsorbent, can realize the used circularly of system, reduces secondary pollution emission simultaneously.
Eighth, this coke oven coal-charging flue gas purification system is in the adsorbent regeneration process, through adopting the flue gas after the purification as the regeneration gas, need not to introduce the regeneration gas from the external world again, can realize the minimizing emission of gaseous pollutants.
Ninth, the coke oven coal-charging flue gas purification system can realize resource recovery of pollutants such as sulfide in coal-charging flue gas through the existing sulfur recovery device 10, and realizes that the pollutants are digested in the system without being discharged outside.
In the flue gas cooling and heating process of the coke oven coal-charging flue gas purification system, the required energy media are cooling water, circulating water or medium-low pressure steam, and the energy media are easy to find in a factory, so that the cost is reduced, and the construction is convenient.
Eleven, the coke oven coal-charging flue gas purification system has the advantages of simple process flow, convenient operation, small occupied area, energy conservation and environmental protection, and is suitable for large-scale popularization and use.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (12)
1. The coke oven coal charging flue gas purification system is characterized by comprising a coal charging dust removal device (2), a flue gas heat exchanger (4), an adsorption purification device (6), a regenerative heater (7) and a sulfur recovery device (10), wherein:
the gas inlet of the coal charging and dust removing device (2) is used for being connected with a coal charging hole of the coke oven (1), the gas outlet of the coal charging and dust removing device (2) is connected with the gas inlet of the flue gas heat exchanger (4), the first gas outlet of the flue gas heat exchanger (4) is connected with the gas inlet of the adsorption and purification device (6), the second gas outlet of the flue gas heat exchanger (4) is connected with the gas inlet of the regenerative heater (7), the gas outlet of the regenerative heater (7) is connected with the gas inlet of the adsorption and purification device (6), the gas return port of the adsorption and purification device (6) is connected with the gas inlet of the flue gas heat exchanger (4), and the gas outlet of the adsorption and purification device (6) is connected with the gas inlet of the sulfur recovery device (10).
2. The coke oven coal-charging flue gas purification system of claim 1, further comprising a flue gas cooler (5), wherein the flue gas cooler (5) is disposed between the flue gas heat exchanger (4) and the adsorption purification device (6), an air inlet of the flue gas cooler (5) is connected to a first air outlet of the flue gas heat exchanger (4), and an air outlet of the flue gas cooler (5) is connected to an air inlet of the adsorption purification device (6).
3. The coke oven coal-charging flue gas purification system of claim 1, characterized in that a flue gas fan (3) is arranged between the coal-charging dust removal device (2) and the flue gas heat exchanger (4), the gas inlet of the flue gas fan (3) is connected with the gas outlet of the coal-charging dust removal device (2), and the gas outlet of the flue gas fan (3) is connected with the gas inlet of the flue gas heat exchanger (4).
4. The coke oven coal-charging flue gas purification system of claim 1, wherein a regeneration fan (8) is arranged between the adsorption purification device (6) and the sulfur recovery device (10), an air inlet of the regeneration fan (8) is connected with an air outlet of the adsorption purification device (6), and an air outlet of the regeneration fan (8) is connected with an air inlet of the adsorption purification device (6).
5. The coke oven coal-charging flue gas cleaning system of claim 1, wherein the third gas outlet of the flue gas heat exchanger (4) is connected to a chimney (9).
6. The coke oven coal-charging flue gas purification system of claim 1, wherein the coal-charging dust removal device (2) is composed of a coke oven coal-charging ground dust removal station and its supporting facilities.
7. The coke oven coal charging flue gas cleaning system of claim 1, wherein the flue gas heat exchanger (4) is an indirect heat exchanger.
8. The coke oven coal-charging flue gas purification system of claim 1, wherein the adsorption purification device (6) is a plurality of adsorption purification towers, the adsorption purification towers are connected in parallel, and an adsorbent capable of being recycled and reused is arranged in each adsorption purification tower.
9. The coke oven coal-charging flue gas purification system of claim 8, wherein the sorbent is a microcrystalline material, a molecular sieve, or activated carbon.
10. The coke oven coal-charging flue gas cleaning system of claim 8, wherein at least one of the adsorption cleaning towers is a spare adsorption cleaning tower.
11. The coke oven coal charging flue gas cleaning system of claim 1, characterized in that the regenerative heater (7) is a steam heater or an electric heater.
12. The coke oven coal-charging flue gas cleaning system of claim 1, wherein the sulfur recovery unit (10) is an acid plant or a salt plant.
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