CN221371106U - Zero release lime-coal gas combined preparation system - Google Patents
Zero release lime-coal gas combined preparation system Download PDFInfo
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- CN221371106U CN221371106U CN202323337418.5U CN202323337418U CN221371106U CN 221371106 U CN221371106 U CN 221371106U CN 202323337418 U CN202323337418 U CN 202323337418U CN 221371106 U CN221371106 U CN 221371106U
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- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000003034 coal gas Substances 0.000 title abstract description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 61
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 61
- 239000004571 lime Substances 0.000 claims abstract description 61
- 238000002485 combustion reaction Methods 0.000 claims abstract description 44
- 238000002309 gasification Methods 0.000 claims abstract description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 15
- 235000019738 Limestone Nutrition 0.000 claims abstract description 10
- 239000006028 limestone Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 130
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 43
- 239000003546 flue gas Substances 0.000 claims description 43
- 238000010438 heat treatment Methods 0.000 claims description 32
- 230000001172 regenerating effect Effects 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 39
- 238000000034 method Methods 0.000 description 13
- 238000001354 calcination Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- -1 raw gas Chemical compound 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to the field of gas preparation, in particular to a lime-gas combined preparation system with zero emission, which comprises a heat exchanger connected with combustion air, wherein the heat exchanger is provided with a combustion working condition and an air supply working condition; the combustion working condition and the air supply working condition are selected or synchronously used; the heat exchanger, the gasification reaction furnace and the gas storage tank are sequentially communicated along the gas flow direction and form a gas preparation circulation loop, and carbonaceous materials which can perform gasification reaction with high-temperature carbon dioxide are arranged in the gasification reaction furnace; under the working condition of air supply, the heat exchanger is communicated with the lime kiln and forms a lime preparation circulation loop, and limestone raw materials are filled in the lime kiln; the utility model can recycle the carbon dioxide tail gas of the lime kiln, realizes the combined preparation of lime and coal gas, has economic and environment-friendly preparation method, and greatly reduces the capture and recovery cost of carbon dioxide.
Description
Technical Field
The utility model relates to the field of gas preparation, in particular to a lime-gas combined preparation system with zero emission.
Background
Lime, namely calcium oxide, is widely used in the iron and steel industry, the calcium carbide industry, the alumina industry, the refractory industry and the like, and is one of the production raw materials required in the large-scale industrial fields, and the basic principle of lime firing is to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide by means of high temperature.
The lime calcining process includes three steps of preheating, calcining and cooling, and a shaft kiln (divided into a double-hearth kiln, a sleeve kiln, a shaft kiln, a beam kiln and the like), a rotary kiln and the like are generally adopted. In lime production, the production tail gas of the kilns mainly comprises fuel combustion flue gas and cooling air tail gas, and the main components of the kiln are carbon dioxide and nitrogen. When the kiln type, the cooling mode and the fuel type are different, the carbon dioxide content in the tail gas of lime production is also different, and the total content range is 25-35%. Because the carbon dioxide concentration of the tail gas is low, the tail gas is directly discharged into the atmosphere after being subjected to dust removal and purification in many lime preparation places, so that the environmental CO 2 is polluted; although the CO 2 can be captured by adopting pressure swing adsorption and other methods to the tail gas of lime preparation with low CO 2 concentration, the methods need to invest in special facilities, and the economic benefits of enterprises are obviously affected due to low CO 2 concentration and high production and operation cost, so that the method is difficult to popularize widely in the lime industry.
In order to solve the problems of high emission of CO 2, high investment for capturing CO 2 from tail gas, high operation cost and the like in the existing lime calcination process, the methods of separating cooling air from the product gas (CO 2) in the calcination process, radiation heating by a partition wall, independently pumping the cooling air in a kiln and the like are presented. However, these methods have disadvantages such as poor isolation between the exhaust gas and the cooling air, uneven heating of the limestone, and the like, and have not been widely put into practical use.
There are two types of processing approaches for captured and separated CO 2, one is sequestration (CCS), a transfer of CO 2, with future uncertainty in sequestering large amounts of CO 2; the other category is utilization (CCU), including food industry, steelmaking, chemical production raw materials, alcohol energy sources and the like, the quantity of CO 2 used in the food industry and steelmaking is limited, and research on the CO 2 chemical production raw materials, alcohol energy sources and the like has achieved effects, but the problems to be solved by cost, energy utilization and the like are faced, and the wide industrial application conditions are not yet provided.
Lime is one of the main raw materials of industries such as steel, calcium carbide, alumina, refractory materials and the like, and more than one hundred million tons of lime are needed in the year. The existing lime production has the problems of environmental impact caused by CO 2, difficult wide application of the existing trapping technical equipment caused by the excessive trapping and recycling cost, huge CO 2 application problems even if trapping and recycling are realized, and the like, so that the problems need to be solved.
Disclosure of utility model
In order to avoid and overcome the technical problems in the prior art, the utility model provides a lime-gas combined preparation system with zero emission. The utility model can recycle the carbon dioxide tail gas of the lime kiln, realizes the combined preparation of lime and coal gas, has economic and environment-friendly preparation method, and greatly reduces the capture and recovery cost of carbon dioxide.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
A lime-coal gas combined preparation system with zero emission comprises a heat exchanger connected with combustion air, wherein the heat exchanger is provided with a combustion working condition and an air supply working condition; the combustion working condition and the air supply working condition are selected or synchronously used;
The heat exchanger, the gasification reaction furnace and the gas storage tank are sequentially communicated along the gas flow direction and form a gas preparation circulation loop, and carbonaceous materials which can perform gasification reaction with high-temperature carbon dioxide are arranged in the gasification reaction furnace;
the heat exchanger is communicated with the lime kiln and forms a lime preparation circulating loop, and the lime kiln is filled with limestone raw materials.
As a further scheme of the utility model: raw gas discharged from the gasification reaction furnace is purified by a first purifying chamber to obtain purified gas, the purified gas is conveyed into a gas storage tank, and an outlet of the gas storage tank is branched to form a purified gas return pipe communicated with a heat exchanger and a purified gas external supply pipe for directly supplying the gas.
As still further aspects of the utility model: exhaust gas of the lime kiln enters the heat exchanger through an exhaust pipeline, a second purifying chamber for purifying the exhaust gas of the lime kiln and a blower for accelerating gas delivery are arranged on the exhaust pipeline, and a temperature controller is arranged on the exhaust pipeline.
As still further aspects of the utility model: the heat exchanger is communicated with the chimney through a first flue pipe to discharge flue gas generated by combustion working conditions.
As still further aspects of the utility model: the first flue gas pipe forms the exhaust pipe and the second flue gas pipe of communicating with exhaust duct with chimney intercommunication after the reposition of redundant personnel, installs discharge valve and flue gas valve on exhaust pipe and the second flue gas pipe respectively in order to control the pipeline and opens and close, installs the draught fan that is used for leading the flue gas in the heat exchanger in the exhaust duct on the second flue gas pipe.
As still further aspects of the utility model: along the gas flow direction, the temperature controller, the second purifying chamber and the blower are connected in sequence, and the interface of the second flue gas pipe and the exhaust pipeline is positioned at the downstream end of the second purifying chamber.
As still further aspects of the utility model: the mixed gas heated by the heat exchanger under the air supply working condition is respectively communicated with the gasification reaction furnace and the lime kiln through hot air pipelines.
As still further aspects of the utility model: the heat exchanger is also connected with a starting combustion source for starting the gas as the combustion working condition of the heat exchanger.
As still further aspects of the utility model: the carbon-containing substance in the gasification reaction furnace is any one of coke, semi-coke, coal and gangue or a mixture of at least two of the above components.
As still further aspects of the utility model: the heat exchanger is a heat accumulating type heating furnace, and at least two heat accumulating type heating furnaces are arranged so that at least one heat accumulating type heating furnace is in a combustion working condition and at least one heat accumulating type heating furnace is in an air supply working condition; each regenerative heating furnace can be switched between a combustion working condition and an air supply working condition, so that the lime-gas combined preparation system can continuously prepare gas.
Compared with the prior art, the utility model has the beneficial effects that:
1. The utility model heats the tail gas of the lime kiln, CO 2 trapped from the lime kiln and the combustion flue gas of the regenerative heating furnace set into CO 2 -containing high-temperature gas with the temperature higher than 1000 ℃ by using the regenerative heating furnace set, so that the high-temperature gas and carbonaceous substances are gasified, CO 2 in the high-temperature gas is directly converted into CO, the clean gas which can be directly used is obtained, the problem that gasifying agents such as high-price oxygen, hydrogen or air, water and the like are additionally added in the traditional coal gasification process is solved, the gasification process flow is simplified, the preparation cost is reduced, and the problems of overhigh trapping cost of the lime kiln CO 2 and direct discharge of environmental pollution are solved.
2. According to the utility model, the lime kiln tail gas, CO 2 trapped from the lime kiln and combustion flue gas of the heat accumulating type heating furnace set are heated to be high-temperature gas higher than 1000 ℃, the high-temperature gas is used for a heat carrier for calcining lime, and the lime kiln calcined tail gas is reheated to prepare gas and recycled for limestone calcination, so that the problems of low concentration of the lime kiln tail gas and the combustion flue gas CO 2 of the heating furnace, high separation and recovery cost, high operation cost and environmental pollution in the prior art are solved.
3. The utility model converts CO 2 separated from the tail gas of the lime kiln and the combustion waste gas of the regenerative heating furnace group into CO to prepare clean gas which can be directly used, and solves the problems of future uncertainty and difficult realization of wide application of the existing CCS and CCU treatment modes of the gases.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of the present utility model.
Fig. 2 is a schematic structural diagram of a second embodiment of the present utility model.
In the figure:
1. A heat exchanger; 11. combustion air;
12. starting coal gas; 13. a first flue gas pipe;
14. a discharge pipe; 141. a discharge valve;
15. a second flue pipe; 151. a smoke valve;
16. An induced draft fan; 17. a hot air duct;
2. A gasification reaction furnace; 21. a first decontamination chamber;
3. A gas storage tank; 31. a clean gas return pipe; 32. an external clean gas supply pipe;
4. Lime kiln; 41. a temperature controller; 42. a second clean room;
43. A blower; 44. an exhaust duct;
5. And (5) a chimney.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 2, in an embodiment of the present utility model, a lime-gas combined preparation system with zero emission includes a heat exchanger 1, where the heat exchanger 1 is preferably at least two regenerative heating furnaces. The heat exchanger 1 is communicated with the starting gas 12, and the starting gas 12 is only used when the heat exchanger 1 is started and is used for normal combustion working conditions; combustion air 11 is also connected to the inlet of the heat exchanger 1 to provide oxygen for combustion.
The high-temperature exhaust gas of the air supply working condition of the heat exchanger 1 is led into two hot air pipelines 17, wherein one hot air pipeline 17 is communicated with the lime kiln 4, and the other hot air pipeline 17 is communicated with the gasification reaction furnace 2. The gasification reaction furnace 2 is internally provided with carbon-containing matters, wherein the carbon-containing matters are any one of coke, semi-coke, coal and gangue or a mixture of at least two of the carbon-containing matters.
After the high-temperature gas enters the gasification reaction furnace 2, the carbon dioxide in the high-temperature gas and the carbon-containing substances in the gasification reaction furnace 2 are gasified, so that carbon monoxide, namely raw gas, is generated.
The outlet of the gasification reaction furnace 2 is communicated with the gas storage tank 3 through the first purifying chamber 21, and after being purified by the first purifying chamber 21, the raw gas is converted into clean gas. After entering the gas storage tank 3, one part of the clean gas flows back to the heat exchanger 1 through the clean gas return pipe 31 to enter a combustion working condition, and burns with oxygen in the combustion air 11 to generate carbon dioxide and generate heat, and the other part of the clean gas is supplied to a user through the clean gas external supply pipe 32. The gas circularly flows along the heat exchanger 1, the gasification reaction furnace 2 and the gas storage tank 3 to form a gas preparation circulation loop.
The outlet of the lime kiln 4 enters the heat exchanger 1 through an exhaust pipe 44, and a temperature controller 41 for controlling the temperature, a second purifying chamber 42 for purifying the exhaust gas of the lime kiln 4 and a blower 43 for accelerating the exhaust gas of the lime kiln 4 are sequentially arranged on the exhaust pipe 44 along the gas flow direction.
The heat exchanger 1 is also provided with an outlet for discharging flue gas under the combustion working condition, the flue gas outlet of the heat exchanger 1 is communicated with the first flue gas pipe 13, and the first flue gas pipe 13 is communicated with the second flue gas pipe 15 and the discharge pipe 14 after being split. The exhaust pipe 14 is provided with an exhaust valve 141, and the exhaust pipe 14 is communicated with the chimney 5 so as to directly exhaust the flue gas. The second flue gas pipe 15 is provided with a flue gas valve 151, the second flue gas pipe 15 is communicated with an exhaust pipeline 44 of the lime kiln 4, and a connection point is positioned between the second purifying chamber 42 and the blower 43. After entering the exhaust pipeline 44 through the second flue gas pipe 15, the flue gas is mixed with the exhaust gas of the lime kiln 4 and enters the heat exchanger 1 to enter the air supply working condition.
The combined preparation method specifically comprises the following steps:
S1, loading carbonaceous matters into a gasification reaction furnace 2 of a lime-gas combined preparation system, and loading limestone into a lime kiln 4; starting the heat exchanger 1, wherein the heat exchanger 1 has a combustion working condition and an air supply working condition, and one or the other of the combustion working condition and the air supply working condition is used synchronously;
The heat exchanger 1 can be a regenerative heating furnace; the heat exchanger 1 in the utility model is preferably at least two regenerative heating furnaces, at least one of which is in a combustion condition, and at least one of which is in an air supply condition. The regenerative heating furnace can be switched between an air supply working condition and a combustion working condition.
Combustion conditions: the heat exchanger 1 burns and starts the coal gas and/or the clean coal gas from the air storage tank 3 until the heat accumulator in the heat exchanger 1 reaches the set temperature required by the air supply working condition; the set temperature is a temperature at which the carbon dioxide gas is gasified and the calcium carbonate is decomposed, and is preferably more than one thousand degrees. The start gas 12 is only used when the system is started, and only the clean gas from the gas storage tank 3 is needed when the system runs stably.
And (3) air supply working conditions: the heat accumulator in the heat exchanger 1 heats the low-temperature mixed gas containing CO 2 to a set temperature;
S2, introducing part of mixed gas heated to a set temperature under an air supply working condition into a lime kiln 4 to calcine limestone, and introducing the other part of mixed gas into a gasification reaction furnace 2 to carry out gasification reaction with carbon-containing substances to generate coal gas;
S3, exhaust gas in the calcination process of the lime kiln 4 enters a heat exchanger 1 under an air supply working condition, and is heated to a set temperature by the heat exchanger 1; part of the high-temperature gas heated to the set temperature enters the lime kiln 4 through one of the hot air pipelines 17 to calcine limestone; the other part enters the gasification reaction furnace 2 through the other hot air pipeline 17.
The CO 2 component in the high-temperature gas and the carbon-containing substances in the gasification reaction furnace 2 are subjected to gasification reaction and discharged out of the gasification reaction furnace 2, so that crude gas is obtained; the crude gas is purified by the second purifying chamber 42 to become purified gas, and the purified gas enters the gas storage tank 3;
Part of the clean gas in the gas storage tank 3 is conveyed to a regenerative heating furnace in a burning state through a clean gas return pipe 31 for burning, and the other part of the clean gas is supplied to other users through a clean gas external supply pipe 32.
In the system operation, the gasification reactor 2 is intermittently charged with carbonaceous material according to the progress of the gasification reactor 2, and ash is intermittently discharged from the gasification reactor 2. Lime stone is intermittently charged into the lime kiln 4 according to the progress of the lime kiln 4, and the prepared lime is intermittently discharged from the lime kiln 4.
In the first embodiment, the heat exchanger 1 is a three-seat regenerative heating furnace, and after the combustion flue gas in the first flue gas pipe 13 enters the second flue gas pipe 15, the combustion flue gas is discharged to the connection point of the second flue gas pipe 15 and the exhaust pipeline 44 of the lime kiln through the flue gas valve 151 and the induced draft fan 16; after entering an exhaust pipeline 44, the exhaust gas of the lime kiln 4 passes through a temperature controller 41 and a second purifying chamber 42, is mixed with combustion flue gas from a second flue gas pipe 15, and enters a regenerative heating furnace under an air supply working condition. When the temperature of the heat accumulation body of the heat accumulation type heating furnace under the air supply working condition is lower than the set temperature, the heat accumulation type heating furnace under the air supply working condition is converted into the combustion working condition; when the temperature of the heat accumulation body of the heat accumulation type heating furnace under the combustion working condition reaches the set temperature, the heat accumulation type heating furnace under the combustion working condition is changed into an air supply working condition.
In the second embodiment, the heat exchanger 1 is two heat accumulating type heat exchangers, and the combustion flue gas in the first flue gas pipe 13 enters the second flue gas pipe 15 and is discharged through the chimney 5. After entering an exhaust pipeline 44, the exhaust gas of the lime kiln 4 passes through a temperature controller 41 and a second purifying chamber 42 and enters a regenerative heating furnace under the air supply working condition under the action of an air blower 43.
In the first embodiment and the second embodiment, continuous joint preparation of lime-gas can be realized through continuous switching of the working states of the regenerative heating furnaces. As a degradation of the first and second embodiments, the heat exchanger 1 may use only one regenerative heating furnace, which is continuously switched under the combustion condition and the air supply condition, thereby intermittently preparing lime-gas.
The effect of converting lime kiln tail gas, carbon dioxide gas trapped from lime kiln and heating furnace flue gas into clean gas is shown in the following table 1:
TABLE 1 conversion Effect of the utility model
Table 1 shows that the calorific value of the three gases after conversion is above 4900KJ/Nm 3, which is higher than the common calorific value of the blast furnace gas at present, namely 3200-3400 KJ/Nm 3, and the method can be widely used. In particular, the calorific value of lime captured CO 2 converted by adopting the method can reach more than 17000KJ/Nm 3. Therefore, the utility model has great significance for developing new fuel gas with high calorific value and reducing carbon emission.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
Claims (10)
1. The lime-gas combined preparation system with zero emission is characterized by comprising a heat exchanger (1) connected with combustion air (11), wherein the heat exchanger (1) has a combustion working condition and an air supply working condition; the combustion working condition and the air supply working condition are selected or synchronously used;
Along the gas flow direction, the heat exchanger (1), the gasification reaction furnace (2) and the gas storage tank (3) are sequentially communicated and form a gas preparation circulation loop, and carbonaceous materials which can be gasified and reacted with high-temperature carbon dioxide are arranged in the gasification reaction furnace (2);
The heat exchanger (1) is communicated with the lime kiln (4) and forms a lime preparation circulation loop, and the lime kiln (4) is filled with limestone raw materials.
2. The lime-gas combined preparation system with zero emission according to claim 1, wherein the raw gas discharged from the gasification reaction furnace (2) is purified by the first purifying chamber (21) to obtain clean gas, and then the clean gas is conveyed into the gas storage tank (3), and the outlet of the gas storage tank (3) is branched to form a clean gas return pipe (31) communicated with the heat exchanger (1) and a clean gas external supply pipe (32) for directly supplying the gas.
3. The lime-gas combined preparation system with zero emission according to claim 1 or 2, characterized in that the exhaust gas of the lime kiln (4) enters the heat exchanger (1) through an exhaust pipe (44), a second purifying chamber (42) for purifying the exhaust gas of the lime kiln (4) and a blower (43) for accelerating the gas delivery are arranged on the exhaust pipe (44), and a temperature controller (41) is arranged on the exhaust pipe (44).
4. A lime-gas combined preparation system with zero emission according to claim 3, characterized in that the heat exchanger (1) communicates with the chimney (5) through a first flue pipe (13) for discharging flue gases generated by combustion conditions.
5. The lime-gas combined preparation system with zero emission according to claim 4, wherein the first flue gas pipe (13) is split to form a discharge pipe (14) communicated with the chimney (5) and a second flue gas pipe (15) communicated with the exhaust pipeline (44), a discharge valve (141) and a flue gas valve (151) are respectively arranged on the discharge pipe (14) and the second flue gas pipe (15) to control the opening and closing of the pipeline, and a draught fan (16) for leading the flue gas in the heat exchanger (1) into the exhaust pipeline (44) is arranged on the second flue gas pipe (15).
6. The lime-gas combined preparation system with zero emission according to claim 5, wherein the temperature controller (41), the second purifying chamber (42) and the blower (43) are connected in sequence along the gas flow direction, and the interface of the second flue pipe (15) and the exhaust pipe (44) is positioned at the downstream end of the second purifying chamber (42).
7. The lime-gas combined preparation system with zero emission according to claim 1 or 2, wherein the mixed gas heated by the heat exchanger (1) under the air supply working condition is respectively communicated with the gasification reaction furnace (2) and the lime kiln (4) through a hot air pipeline (17).
8. The lime-gas combined preparation system with zero emission according to claim 1 or 2, wherein the heat exchanger (1) is further connected with a starting gas (12) as a starting combustion source for the combustion condition of the heat exchanger (1).
9. The zero-emission lime-gas combined preparation system according to claim 1 or 2, wherein the carbon-containing substances in the gasification reaction furnace (2) are any one of coke, semi-coke, coal and gangue or a mixture of at least two of the above.
10. The zero-emission lime-gas combined preparation system according to claim 1 or 2, wherein the heat exchanger (1) is a regenerative heating furnace, and at least two regenerative heating furnaces are arranged so that at least one regenerative heating furnace is in a combustion condition and at least one regenerative heating furnace is in an air supply condition; each regenerative heating furnace can be switched between a combustion working condition and an air supply working condition, so that the lime-gas combined preparation system can continuously prepare gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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