CN210560255U - Clean coking system - Google Patents
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- CN210560255U CN210560255U CN201921255881.6U CN201921255881U CN210560255U CN 210560255 U CN210560255 U CN 210560255U CN 201921255881 U CN201921255881 U CN 201921255881U CN 210560255 U CN210560255 U CN 210560255U
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Abstract
The utility model relates to a clean coking system, which comprises a coke oven heating system, a coal high-temperature carbonization system, a coal gas collecting and purifying system, a coal gas hydrogen extraction system, a coke oven flue gas pretreatment system and a coke oven flue gas cooling system; the coke oven heating system is arranged adjacent to the coal high-temperature dry distillation system, and the coal high-temperature dry distillation system is provided with a coal gas outlet which is sequentially connected with a coal gas collecting and purifying system and a coal gas hydrogen extracting system through a coal gas pipeline; the coke oven heating system is provided with a flue gas outlet which is sequentially connected with a coke oven flue gas pretreatment system and a coke oven flue gas cooling system through a flue gas pipeline; the utility model discloses can effectively reduce or avoid coking production in-process atmospheric pollutants's generation, produce clean energy product, improve coking production's resource utilization level, reduce coking production process greenhouse gas's emission, establish green coking production technology.
Description
Technical Field
The utility model relates to a coal coking technical field especially relates to a clean coking system.
Background
Coking is a process of converting coal suitable for coking into coke and coal gas through high-temperature dry distillation. At present, the mechanical heat accumulating type coke oven is most widely applied in the field of coal coking, and a coking oven group is formed by adjacent and spaced coking chambers and combustion chambers. In the combustion chamber, the fuel gas (coke oven gas or other types of fuel gas) for heating the coke oven is mixed with air to generate combustion reaction, and simultaneously, a large amount of heat is released. The heat generated by combustion is transferred to the coal material in the carbonization chamber through the furnace wall between the combustion chamber and the carbonization chamber, the coal material is dry distilled into coke in the carbonization chamber under the continuous high-temperature heat supply effect, and meanwhile, volatile components in the coal material form raw coke gas under the high-temperature effect. The raw gas obtained by dry distillation of the coal material in the carbonization chamber is cooled by circulating ammonia water when passing through an ascending pipe and a bridge pipe at the top of the coke oven, and meanwhile, components such as tar in the raw gas are condensed and then separated from the gas, and the components are collected by a coke oven gas collecting pipe and guided into a gas purification system. In the gas purification system, impurities such as tar, ammonia, benzene, sulfur and the like in the gas and valuable components in the gas are effectively separated, and various chemical products with high added values are formed through the treatment of corresponding processing production processes.
In the above process, when the coke oven is heated, for the coking production of the steel and iron combined enterprise, the mixed gas formed by mixing the blast furnace gas (also called lean gas) from the blast furnace production process and a small amount of coke oven gas treated by the gas purification system is usually adopted to be combusted with air to provide heat energy for the coke oven production. For an independent coking production enterprise, purified coke oven gas (also called rich gas) produced by a coke oven and air are generally combusted to provide heat energy for the production of the coke oven. No matter the mixed gas heating or the coke oven gas heating is used, the combustion reaction is carried out in the combustion chamber to release heat, and simultaneously, the carbon-containing component in the gas can generate CO after being combusted2Under high temperature condition, nitrogen in air can be oxidized to generate NOx, and sulfide in coal gas can be oxidized to generate SO2CO formed after these combustions2NOx and SO2The waste gas enters a small flue, a branch flue and a main flue of the coke oven in sequence along with the combustion waste gas, and is finally discharged into the atmosphere through a coke oven chimney. In the exhaust gas, NOx and SO2Is a pollutant with pollution function to the atmosphere, and must be removed from waste gas under the increasingly strict requirements of environmental protection policy and law and regulationAs much as possible, coke oven flue gas desulfurization and denitration facilities are generally arranged for purifying coke oven flue gas. And CO in the exhaust gas2Is a recognized greenhouse gas, and the emission of a large amount of the greenhouse gas into the atmosphere is an important factor causing the natural disasters such as the rise of the surface temperature of the earth, the initiation of glacier ablation, sea level rise, hurricane, flood, drought and the like, so the greenhouse gas also receives more and more attention from countries and various international organizations in the world, and how to reduce the CO generated by the production and living activities of human beings2And its discharge to the atmosphere, is an important work direction for protecting the environment.
In the current coking production process, NOx and SO generated in the heating process of the coke oven are treated2Although the coke oven flue gas can be purified by arranging the desulfurization and denitrification facility, the construction and operation of the desulfurization and denitrification facility require that more cost and energy are continuously input into the coking production enterprises. For CO in coke oven exhaust gas2No effective emission reduction measures have been implemented.
Taking a coking production facility with a coke production capacity of 100 ten thousand tons/year as an example, roughly calculated, if mixed gas heating is adopted, about 50 ten thousand tons of CO are generated each year2Only according to the data calculation of nearly 1.2 million tons of annual coke yield of the steel and iron combination enterprises in China, 0.6 million tons of CO are discharged to the atmosphere in the coking production of the steel and iron combination enterprises in China every year2。
Therefore, in order to protect the environment in which human beings rely on living and reduce the pollution of coking production enterprises to the atmosphere, the coking production process needs to be continuously improved and a clean and environment-friendly coking process needs to be developed.
Disclosure of Invention
The utility model provides a clean coking system can effectively reduce or avoid coking production in-process atmospheric pollutant's formation, produces clean energy product, improves coking production process's utilization level, reduces coking production process greenhouse gas's emission, founds green coking production technology.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a clean coking system comprising cokeThe system comprises a furnace heating system, a coal high-temperature carbonization system, a coal gas collecting and purifying system, a coal gas hydrogen extraction system, a coke oven flue gas pretreatment system and a coke oven flue gas cooling system; the coke oven heating system comprises a combustion-supporting gas supply unit, a fuel gas supply unit, a combustion chamber and a regenerative chamber, wherein the combustion-supporting gas supply unit is provided with a combustion-supporting gas inlet which is connected with a pure oxygen conveying pipeline, and the fuel gas supply unit is provided with a fuel gas inlet which is connected with a coke oven gas conveying pipeline; the coke oven heating system is arranged adjacent to the coal high-temperature dry distillation system, a partition wall is arranged between a combustion chamber in the coke oven heating system and a carbonization chamber in the coal high-temperature dry distillation system, and a plurality of combustion chambers and carbonization chambers which are arranged at intervals form a coke oven group; the coal high-temperature dry distillation system is provided with a coal gas outlet which is sequentially connected with a coal gas collecting and purifying system and a coal gas hydrogen extracting system through a coal gas pipeline; the coke oven heating system is provided with a flue gas outlet which is sequentially connected with the coke oven flue gas pretreatment system and the coke oven flue gas cooling system through a flue gas pipeline, and the coke oven flue gas cooling system is provided with a condensed water outlet and CO2Flue gas outlet, CO2The flue gas outlet passes through CO2CO on carbonization chamber in flue gas conveying pipeline and coal high-temperature carbonization system2The flue gas inlets are connected; the coal gas hydrogen stripping system is provided with a product hydrogen outlet and a coke oven gas outlet, and the coke oven gas outlet is connected with a coke oven gas conveying pipeline.
The heat storage chamber of the coke oven heating system is connected with the coke oven flue gas pretreatment system through a small flue, a branch flue and a main flue.
The coke oven flue gas pretreatment system comprises a flue gas desulfurization system and a flue gas waste heat recovery system.
The flue gas desulfurization system adopts an active coke desulfurization system
Compared with the prior art, the beneficial effects of the utility model are that:
1) producing clean energy;
the coke oven gas generated by high-temperature dry distillation of coal is rich in H2And H is2H has been receiving increasing attention as a clean energy source2The preparation of (b) has become an insurmountable premise for the hydrogen energy utilization industry. The coking production is the high-efficient conversion and utilization of coal resources and is necessary in the steel production industryThe extraction of hydrogen in the byproduct coke oven gas can greatly reduce the cost of hydrogen preparation by utilizing hydrogen energy, and the hydrogen can become an important hydrogen source for hydrogen energy industry. Therefore, adopt the system draws hydrogen in the coke oven gas, can widen the road of coking industry development, tamps the root of coal coking industry.
2) The source emission reduction of NOx is realized;
the utility model discloses an adopt the pure oxygen burning, reduce and avoided NOx's formation even, will realize the reduction of discharging of pollutant from the source of coking production. Meanwhile, because the existing coke oven heating system does not use air as combustion-supporting gas, the existence of a large amount of N2 in waste gas after combustion is avoided, the volume of coke oven smoke is obviously reduced, and the effective energy loss caused by the discharge of waste gas carrying a large amount of heat is also avoided, so that the energy utilization efficiency of the coke oven heating system is obviously improved, and the energy conservation is realized from the source.
3) Producing high calorific value gas;
after the purified coke oven gas is subjected to hydrogen extraction, the heat value of the residual coke oven gas is improved by nearly 60 percent, and the combustion efficiency and the energy utilization efficiency can be obviously improved no matter the coke oven is heated or used as fuel gas for other purposes. The increase of the heat value is accompanied with the sudden decrease of the volume of the fuel gas, so that the pipeline used for delivering the fuel gas is reduced, and the delivery of the fuel gas is more convenient.
4) Realization of CO2Emission reduction and resource utilization;
because the utility model adopts pure oxygen combustion, the main component of the coke oven smoke generated by the coke oven heating system is CO2And H2And O, the content of the two components is nearly 96 percent of the total amount of the coke oven smoke. H in the flue gas is cooled by a coke oven flue gas cooling system2Cooling the O into condensed water and recycling the condensed water, thereby saving precious water resources. And CO2The coke oven gas is sent into a carbonization chamber, reacts with coal coke materials at high temperature to generate CO, and is converted into usable energy again, so that zero emission of coke oven gas is realized, the heat value of the coke oven gas is improved, and the coke oven gas has positive promotion significance for environmental protection and efficient utilization of energy.
5) The energy utilization efficiency in the coking process is improved;
the heat accumulator with enough heat accumulation capacity is arranged in the heat accumulation chamber, the temperature of the coke oven smoke is reduced to 300 ℃ or below 150 ℃, so that the energy released by the combustion of the coke oven heating system gas is fully used for the dry distillation of the coal in the carbonization chamber, and the energy carried by the discharged waste gas is reduced, thereby improving the utilization efficiency of energy in the coking process and reducing the total energy consumption of the coking process.
Drawings
FIG. 1 is a schematic diagram of a clean coking system according to the present invention.
FIG. 2 is a schematic diagram of the coke oven heating system of the present invention.
In the figure: 1. the system comprises a coke oven heating system 11, a combustion-supporting gas supply unit 12, a fuel gas supply unit 13, a combustion chamber 14, a regenerative chamber 2, a coal high-temperature carbonization system 3, a coal gas collecting and purifying system 4, a coal gas hydrogen extracting system 5, a coke oven flue gas pretreatment system 6 and a coke oven flue gas cooling system
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the clean coking system of the present invention comprises a coke oven heating system 1, a coal high temperature dry distillation system 2, a coal gas collecting and purifying system 3, a coal gas hydrogen extraction system 4, a coke oven flue gas pretreatment system 5 and a coke oven flue gas cooling system 6; as shown in fig. 2, the coke oven heating system 1 includes a combustion-supporting gas supply unit 11, a gas supply unit 12, a combustion chamber 13 and a regenerator 14, wherein the combustion-supporting gas supply unit 11 is provided with a combustion-supporting gas inlet connected to a pure oxygen delivery pipe, and the gas supply unit 12 is provided with a gas inlet connected to a coke oven gas delivery pipe; the coke oven heating system 1 is arranged adjacent to the coal high-temperature dry distillation system 2, a partition wall is arranged between a combustion chamber 13 in the coke oven heating system 1 and a carbonization chamber in the coal high-temperature dry distillation system 2, and a plurality of combustion chambers 13 which are arranged at intervals and the carbonization chambers jointly form a coke oven group; the coal high-temperature dry distillation system 2 is provided with a coal gas outlet which is sequentially connected with a coal gas collecting and purifying system 3 and a coal gas hydrogen extracting system 4 through a coal gas pipeline; the coke oven heating system 1 is provided with a flue gas outlet which is sequentially connected with a coke oven flue gas pretreatment system 5 and a coke oven flue gas cooling system 6 through a flue gas pipeline, the coke oven flue gas cooling system 6 is provided with a condensed water outlet and a CO2 flue gas outlet, and the CO2 flue gas outlet is connected with a CO2 flue gas inlet on a carbonization chamber in the coal high-temperature dry distillation system 2 through a CO2 flue gas conveying pipeline; the coal gas hydrogen stripping system 4 is provided with a product hydrogen outlet and a coke oven gas outlet, and the coke oven gas outlet is connected with a coke oven gas conveying pipeline.
The heat storage chamber of the coke oven heating system 1 is connected with a coke oven flue gas pretreatment system 5 through a small flue, a branch flue and a main flue.
The coke oven flue gas pretreatment system 5 comprises a flue gas desulfurization system and a flue gas waste heat recovery system.
The flue gas desulfurization system adopts an active coke desulfurization system
The technical process of the clean coking system is as follows:
1) in a combustion chamber 13 of the coke oven heating system 1, oxygen and coke oven gas are fully combusted and release heat, and coal materials in a carbonization chamber in the coal high-temperature carbonization system 2 are heated and carbonized;
2) the main component of the coke oven smoke generated after the combustion of the coke oven heating system 1 is CO2、H2O and small amount of SO2The coke oven flue gas enters a coke oven flue gas pretreatment system 5; in a coke oven flue gas pretreatment system, desulfurizing coke oven flue gas and recovering waste heat;
3) the coke oven smoke after pretreatment enters a coke oven smoke cooling system 6; in the coke oven flue gas cooling system 6, water vapor in the flue gas is condensed into liquid condensate water, and the liquid condensate water is recycled through a condensate water recycling system;
4) the main component of the coke oven smoke after the water vapor is removed is CO2The main component is CO2The coke oven smoke is sent to a carbonization chamber of the coal high-temperature carbonization system 2; in a carbonization chamber, CO2Contact with high-temperature coal coke material to generate chemical reaction, CO2Is converted into CO and is discharged into a gas collecting and purifying system 3 along with the coke oven gas generated in the carbonization chamber through an ascending pipe, thereby realizing CO2Resource transformation is carried out;
5) the coke oven gas entering the gas collecting and purifying system 3 is cooled and purified, then impurities in the coke oven gas are removed, corresponding tar, ammonia water, benzene products and byproducts are obtained, and the purified coke oven gas enters a gas hydrogen stripping system 4;
6) in the gas hydrogen extraction system 4, hydrogen in the coke oven gas is separated out to be used as product hydrogen, the coke oven gas after hydrogen extraction is used as product gas, and a part of the coke oven gas returns to the coke oven heating system 1 to be used as fuel gas.
In the coke oven heating system 1, the combustion-supporting gas adopts pure oxygen, and the purified and hydrogen-extracted coke oven gas contains CH4CO and other hydrocarbons.
The coke oven flue gas generated by the coke oven heating system 1 is collected by the regenerator 14, the small flue, the branch flue and the main flue and then enters the coke oven flue gas pretreatment system 5.
A heat accumulator is arranged in the heat accumulator 14, the coke oven smoke passing through the heat accumulator 14 is cooled to below 300 ℃ after heat exchange with the heat accumulator, and the cooled coke oven smoke enters the coke oven smoke pretreatment system 5; the coke oven flue gas pretreatment system 5 comprises a flue gas desulfurization system and a flue gas waste heat recovery system, wherein the flue gas desulfurization system removes SO in the coke oven flue gas2And the flue gas waste heat recovery system recovers the waste heat of the coke oven flue gas.
The heat accumulator is arranged in the heat accumulator 14, the coke oven smoke passing through the heat accumulator 14 can be cooled to below 150 ℃ after heat exchange with the heat accumulator, and the cooled coke oven smoke enters the coke oven smoke pretreatment system 5; the coke oven flue gas pretreatment system 5 comprises a flue gas desulfurization system and a flue gas waste heat recovery system, coke oven flue gas firstly passes through the flue gas waste heat recovery system to recover the waste heat of coke oven flue gas, and then enters the flue gas desulfurization system to remove SO2And the flue gas desulfurization system adopts an active coke desulfurization system.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. A clean coking system is characterized by comprising a coke oven heating system, a coal high-temperature carbonization system, a coal gas collecting and purifying system, a coal gas hydrogen extraction system, a coke oven flue gas pretreatment system and a coke oven flue gas cooling system; the coke oven heating system comprises a combustion-supporting gas supply unit, a fuel gas supply unit, a combustion chamber and a regenerative chamber, wherein the combustion-supporting gas supply unit is provided with a combustion-supporting gas inlet which is connected with a pure oxygen conveying pipeline, and the fuel gas supply unit is provided with a fuel gas inlet which is connected with a coke oven gas conveying pipeline; the coke oven heating system is arranged adjacent to the coal high-temperature dry distillation system, a partition wall is arranged between a combustion chamber in the coke oven heating system and a carbonization chamber in the coal high-temperature dry distillation system, and a plurality of combustion chambers and carbonization chambers which are arranged at intervals form a coke oven group; the coal high-temperature dry distillation system is provided with a coal gas outlet which is sequentially connected with a coal gas collecting and purifying system and a coal gas hydrogen extracting system through a coal gas pipeline; the coke oven heating system is provided with a flue gas outlet which is sequentially connected with the coke oven flue gas pretreatment system and the coke oven flue gas cooling system through a flue gas pipeline, and the coke oven flue gas cooling system is provided with a condensed water outlet and CO2Flue gas outlet, CO2The flue gas outlet passes through CO2CO on carbonization chamber in flue gas conveying pipeline and coal high-temperature carbonization system2The flue gas inlets are connected; the coal gas hydrogen stripping system is provided with a product hydrogen outlet and a coke oven gas outlet, and the coke oven gas outlet is connected with a coke oven gas conveying pipeline.
2. The clean coking system of claim 1 in which the regenerators of the coke oven heating system are connected to the coke oven flue gas pretreatment system by small flues, sub-flues and main flues.
3. The clean coking system of claim 1, wherein the coke oven flue gas pretreatment system includes a flue gas desulfurization system and a flue gas waste heat recovery system.
4. The clean coking system of claim 3 in which the flue gas desulfurization system is an active coke desulfurization system.
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| CN201921255881.6U CN210560255U (en) | 2019-08-05 | 2019-08-05 | Clean coking system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452724A (en) * | 2019-08-05 | 2019-11-15 | 中冶焦耐(大连)工程技术有限公司 | A kind of clean coking process and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452724A (en) * | 2019-08-05 | 2019-11-15 | 中冶焦耐(大连)工程技术有限公司 | A kind of clean coking process and system |
| CN110452724B (en) * | 2019-08-05 | 2024-03-19 | 中冶焦耐(大连)工程技术有限公司 | Clean coking process and system |
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