CN210595918U - Coking waste heat comprehensive recovery system - Google Patents
Coking waste heat comprehensive recovery system Download PDFInfo
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- CN210595918U CN210595918U CN201921363879.0U CN201921363879U CN210595918U CN 210595918 U CN210595918 U CN 210595918U CN 201921363879 U CN201921363879 U CN 201921363879U CN 210595918 U CN210595918 U CN 210595918U
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model relates to a coking waste heat comprehensive recovery system, which comprises a coke oven waste flue gas introduction system, a heat exchanger I, a dry quenching furnace, a denitration reducing agent supply device, a primary dust remover, a waste heat boiler, a dry desulfurization device, a secondary dust remover, a heat exchanger II, an induced draft fan and a chimney; the utility model discloses with coke oven waste flue gas waste heat recovery and SOx/NOx control clean system and dry coke quenching system organic integration, when realizing the recovery of red burnt waste heat and coke oven waste flue gas waste heat, accomplish the purification of coke oven waste flue gas, make fume emission satisfy national standard, reduce the atmosphere pollution.
Description
Technical Field
The utility model relates to a coking waste heat recovery technical field especially relates to a coking waste heat comprehensive recovery system.
Background
In the production process of the coke oven, gas (blast furnace gas, coke oven gas or mixed gas) is combusted in the combustion chamber and simultaneously supplies heat to the carbonization chamber, high-temperature flue gas generated by combustion is discharged after heat exchange of the heat accumulation chamber, and the temperature of the flue gas reaches 200 ℃ and 300 ℃, and is called coke oven waste flue gas. Removing N carried in air from coke oven waste flue gas2CO generated after combustion2And H2In addition to O, a small amount of residual O2And SO formed during combustion2、NOXSO contained in coke oven waste flue gas2One of the important pollution sources of the atmosphere, NOXIs one of the pollution sources causing photochemical fog, and the pollution and the harm to the atmospheric environment caused by the photochemical fog are very large.
The emission standard of pollutants for the coking chemical industry (GB16171-2012) specifies: the emission of sulfur dioxide in the coke oven flue gas from 1 month and 1 day of 2015 is not more than 50mg/m3Nitrogen oxide emission must not exceed 500mg/m3With the increasing emphasis on ecological environment protection in China, more and more places and industries begin to implement more strict special emission standards, and the comprehensive treatment of pollutants in coke oven waste flue gas becomes a basic requirement for focusing production enterprises. At present, the purification of the waste flue gas of the coke oven mostly adopts the technological process of sodium carbonate desulfurization and SCR denitration and the integrated process of activated carbon desulfurization and denitration, large-scale flue gas purification devices such as an SCR denitration reactor, an activated carbon denitration reactor and a dust remover need to be configured, the one-time investment reaches 35-45 yuan per ton of coke, the operation cost is about 13 yuan per ton of coke, and the process has large investment and high treatment cost.
The dry quenching process is a technology for efficiently and continuously recovering and utilizing sensible heat of high-temperature (950-1100 ℃) red coke by using inert gas, and mainly comprises a dry quenching furnace, a circulating fan, a primary dust remover, a boiler, a secondary dust remover and other equipment which are connected by pipelines. In the coke quenching process, red coke enters from the top of the coke dry quenching furnace and flows in a reverse direction with circulating cooling gas to complete a convection heat exchange process, cooled solid particles are discharged from the bottom of the shaft furnace, and high-temperature gas which fully absorbs the sensible heat of the red coke enters a subsequent device through an exhaust port of the coke dry quenching furnace to perform waste heat utilization, such as steam generation or power generation. The process has the advantages of high waste heat recovery rate, environment-friendly operation and the like, and is widely used. However, in the process of dry quenching, because of the burning of residual volatile components in red coke and the burning loss of part of coke powder, a certain amount of sulfur dioxide is contained in the circulating gas and is continuously accumulated in the operation process, so that the content of sulfur dioxide in the circulating gas diffused behind the fan is higher, and therefore, the diffused part of the circulating gas needs to be subjected to desulfurization and purification treatment before being discharged into the atmosphere. The existing methods are different, and a desulfurization purification device is separately arranged for the desulfurization purification treatment of the part of the diffused circulating gas, but a complete system with complete facilities needs to be invested, so that certain investment is increased. The waste gas is introduced into a desulfurization and denitrification system for the waste flue gas of the coke oven, but the part of the diffused gas contains dust with higher concentration, so that necessary dust removal facilities are required to be added, and the temperature of the waste flue gas of the coke oven is reduced to a certain extent, so that the operation of the desulfurization and denitrification system for the waste flue gas of the coke oven is adversely affected.
Disclosure of Invention
The utility model provides a recovery system is synthesized to coking waste heat organically fuses coke oven waste flue gas waste heat recovery and SOx/NOx control clean system and dry coke quenching system, when realizing the recovery of red burnt waste heat and coke oven waste flue gas waste heat, accomplishes the purification of coke oven waste flue gas, makes fume emission satisfy national standard, reduces the atmosphere pollution.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a comprehensive recovery system for coking waste heat comprises a coke oven waste flue gas introduction system, a heat exchanger I, a dry quenching furnace, a denitration reducing agent supply device, a primary dust remover, a waste heat boiler, a dry desulfurization device, a secondary dust remover, a heat exchanger II, an induced draft fan and a chimney; the coke oven waste flue gas introducing system comprises a coke oven main flue and a flue turning plate, wherein a waste flue gas outlet is formed in the coke oven main flue, and the flue turning plate is arranged on the coke oven main flue between the waste flue gas outlet and a chimney; the waste flue gas outlet is connected with a waste flue gas inlet of the first heat exchanger through a waste flue gas pipeline, and a waste flue gas outlet of the first heat exchanger is connected with a gas supply device at the lower part of the dry quenching furnace; a waste flue gas outlet at the upper part of the dry quenching furnace is sequentially connected with a primary dust remover, a waste heat boiler, a dry desulphurization device, a secondary dust remover, a heat exchanger II, a fan and a chimney through a waste flue gas conveying pipeline; along the flowing direction of the waste flue gas, a denitration reducing agent spraying inlet is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover and is connected with a denitration reducing agent supply device through a reducing agent supply pipeline.
The primary dust remover is a gravity dust remover.
The dry desulphurization device is an SDS sodium-based dry desulphurization device, and the NaHCO is arranged in the SDS sodium-based dry desulphurization device3Supply means by NaHCO3The spraying pipe is connected with the waste flue gas conveying pipeline.
The dry desulfurization device is an active coke dry desulfurization device.
The first heat exchanger is provided with a demineralized water inlet and a demineralized water outlet, and the demineralized water inlet and the demineralized water outlet are respectively connected with an economizer of the waste heat boiler through demineralized water pipelines.
The heat exchanger II is provided with a waste flue gas inlet, a waste flue gas outlet, a demineralized water inlet and a demineralized water outlet, the waste flue gas inlet is connected with a waste flue gas conveying pipeline at the upstream of the heat exchanger II, and the waste flue gas outlet is connected with a waste flue gas conveying pipeline at the downstream of the heat exchanger II; the demineralized water inlet and the demineralized water outlet are respectively connected with the economizer of the waste heat boiler through demineralized water pipelines.
The secondary dust remover is a bag type dust remover, and a dust collecting device is arranged at the bottom of the bag type dust remover.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model discloses utilize coke oven waste flue gas to cool off high temperature coke as heat transfer medium, the waste heat recovery of two big waste heat resources of high temperature red coke and coke oven waste flue gas in the coking production process organically fuses in a waste heat recovery system, improve coke oven waste flue gas waste heat recovery heat quality, when increasing dry quenching waste heat utilization ability, realized the desulfurization denitration purification treatment of coke oven waste flue gas, reduced the configuration of relevant flue gas treatment facility such as dust removal facility, fan and power facility, overall process layout is simple, take up an area of for a short time, disposable construction cost and running cost are low;
2) the high-temperature coke is used for heating the coke oven waste flue gas, a relatively suitable SNCR flue gas denitration environment is formed, and the problems of high use cost, difficult recovery and treatment and the like of the catalyst caused by the SCR method used for the coke oven waste flue gas denitration are solved by adopting the SNCR flue gas denitration process;
3) the bag type dust removal device is adopted to treat the flue gas, the dust removal efficiency is high, the dust concentration at the discharge outlet of the dust removal device can be below 10mg/m3, a draught fan arranged behind the dust removal device is not required to be provided with a special wear-resistant measure, compared with the traditional dry quenching circulating fan, the purchase and maintenance cost of the fan can be obviously reduced, the failure rate is reduced, and the stability of the dry quenching continuous operation is improved;
4) when the coke oven waste flue gas is subjected to desulfurization, denitrification and purification treatment, compared with the existing dry quenching process, the problem of desulfurization of the diffused circulating gas is not required to be considered, and the gas discharged into a chimney can completely meet the requirement of environmental protection standard.
Drawings
FIG. 1 is a schematic structural diagram of a comprehensive recovery system for coking waste heat of the present invention.
Fig. 2 is a schematic structural diagram of a comprehensive recovery system for coking waste heat of the present invention.
In the figure: 1. the method comprises the following steps of (1) dry quenching furnace 2, denitration reducing agent supply device 3, primary dust remover 4, waste heat boiler 51, SDS sodium based dry desulphurization device 52, active coke dry desulphurization device 6, secondary dust remover 7, dust collection device 8, heat exchanger II 9, induced draft fan 10, heat exchanger I11, coke oven main flue 12, chimney 13, flue turning plate 14 and high-temperature coke
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
referring to fig. 1 and 2, the comprehensive recovery system for coking waste heat of the present invention comprises a coke oven waste flue gas introduction system, a first heat exchanger 10, a dry quenching furnace 1, a denitration reducing agent supply device 2, a primary dust remover 3, a waste heat boiler 4, a dry desulfurization device, a secondary dust remover 6, a second heat exchanger 8, a draught fan 9 and a chimney 12; the coke oven waste flue gas introducing system comprises a coke oven main flue 11 and a flue turning plate 13, wherein a waste flue gas outlet is formed in the coke oven main flue 11, and the flue turning plate 13 is arranged on the coke oven main flue 11 between the waste flue gas outlet and a chimney 12; the waste flue gas outlet is connected with a waste flue gas inlet of the first heat exchanger 10 through a waste flue gas pipeline, and a waste flue gas outlet of the first heat exchanger 10 is connected with a gas supply device at the lower part of the dry quenching furnace 1; a waste flue gas outlet at the upper part of the dry quenching furnace 1 is sequentially connected with a primary dust remover 3, a waste heat boiler 4, a dry desulphurization device, a secondary dust remover 6, a heat exchanger II 8, a fan 9 and a chimney 12 through a waste flue gas conveying pipeline; along the flow direction of the waste flue gas, a denitration reducing agent spraying inlet is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover 3, and is connected with a denitration reducing agent supply device 2 through a reducing agent supply pipeline.
The primary dust collector 3 is a gravity dust collector.
The dry desulphurization device is an SDS sodium-based dry desulphurization device 51, and the NaHCO is arranged in the SDS sodium-based dry desulphurization device3Supply means by NaHCO3The spraying pipe is connected with the waste flue gas conveying pipeline.
The dry desulfurization device is an active coke dry desulfurization device 52.
The first heat exchanger 10 is provided with a demineralized water inlet and a demineralized water outlet, and the demineralized water inlet and the demineralized water outlet are respectively connected with the economizer of the waste heat boiler 4 through demineralized water pipelines.
The heat exchanger II 8 is provided with a waste flue gas inlet, a waste flue gas outlet, a demineralized water inlet and a demineralized water outlet, the waste flue gas inlet is connected with a waste flue gas conveying pipeline at the upstream of the heat exchanger II 8, and the waste flue gas outlet is connected with a waste flue gas conveying pipeline at the downstream of the heat exchanger II 8; the demineralized water inlet and the demineralized water outlet are respectively connected with the economizer of the waste heat boiler 4 through demineralized water pipelines.
The secondary dust remover 6 is a bag type dust remover, and a dust collecting device is arranged at the bottom of the bag type dust remover.
The working principle of the coking waste heat comprehensive recovery system is as follows: the method comprises the following steps of (1) leading out coke oven waste flue gas generated in the heating process of a coke oven from a coke oven main flue 11, feeding the coke oven waste flue gas into a dry quenching furnace 1 as a cooling medium after heat exchange and cooling to exchange heat with high-temperature coke, feeding the waste flue gas discharged from the dry quenching furnace 1 into a primary dust remover 3 to remove dust and purify, and spraying a denitration reducing agent into the primary dust remover 3; the waste flue gas after primary dust removal and denitration enters a waste heat boiler 4 for heat exchange, the waste flue gas after heat exchange is subjected to SDS sodium-based dry desulfurization or active coke-drying desulfurization, and the desulfurized waste flue gas is subjected to secondary dust removal and heat exchange and then is sent to a chimney 12 for emission.
The technical process of the comprehensive coking waste heat recovery system is as follows:
1) the coke oven waste flue gas generated in the heating process of the coke oven is led out from a coke oven main flue 11 through a coke oven waste flue gas leading-in system and is sent into a heat exchanger I10;
2) in the heat exchanger I10, the coke oven waste flue gas with the temperature of 200-300 ℃ is cooled to below 150 ℃ by desalted water from the waste heat boiler 4 in an indirect heat exchange mode, part of heat carried by the coke oven waste flue gas is recycled and then is sent to the waste heat boiler 4, and the cooled coke oven waste flue gas enters the dry quenching furnace 1 through a gas supply device at the lower part of the dry quenching furnace 1;
3) in the dry quenching furnace 1, coke oven waste flue gas is in reverse contact with high-temperature coke 14, the waste flue gas after absorbing the heat of the coke is discharged from the upper section of the dry quenching furnace 1 and enters a primary dust remover 3, and the cooled coke is discharged through a coke discharging system at the lower part of the dry quenching furnace 1;
4) the denitration reducing agent supply device 2 sprays the denitration reducing agent into the primary dust remover 3 through the reducing agent supply pipeline, the denitration reducing agent and NOx in the waste flue gas generate SNCR reaction at the environmental temperature of 800-1000 ℃, and the NOx is reduced into N2And other harmless gases, and simultaneously, the coke powder carried in the waste flue gas is separated from the flue gas through inertial collision and sedimentation in the primary dust remover 3;
5) the waste flue gas after primary dust removal enters a waste heat boiler 4, and the waste heat boiler 4 generates high-temperature high-pressure steam by using heat carried by the waste flue gas for power generation or equipment driving; the waste flue gas with heat recovered by the waste heat boiler 4 enters a dry desulphurization device;
6) according to the outlet temperature of the waste flue gas on the waste heat boiler 4, the following two different dry desulphurization processes are adopted:
firstly, Sodium Dodecyl Sulfate (SDS) dry desulfurization: controlling the temperature of the waste flue gas outlet of the waste heat boiler 4 to be more than 200 ℃, and spraying NaHCO into the waste flue gas conveying pipeline by adopting an SDS sodium-based dry desulphurization device 513，NaHCO3With SO in waste flue gas2Fully contact to generate chemical reaction to generate NaHSO3、Na2SO3Realizing SO in the waste flue gas2Removal of (2), the NaHSO formed3、Na2SO3Enters a subsequent secondary dust remover 6 along with the waste flue gas;
secondly, active coke dry method desulfurization; controlling the temperature of the waste flue gas outlet of the waste heat boiler 4 below 150 ℃, and adopting an active coke dry desulphurization device 52 to remove SO in the waste flue gas2Carrying out removal treatment, and enabling the desulfurized waste flue gas to enter a subsequent secondary dust remover 6;
7) the waste flue gas entering the secondary dust remover 6 is sent to a second heat exchanger 8 after solid particles carried in the waste flue gas are removed in a filtering and dust removing mode;
8) in the second heat exchanger 8, the waste flue gas is cooled by the desalted water from the waste heat boiler 4 in an indirect heat exchange mode, part of heat carried by the waste flue gas is recycled and then sent to the waste heat boiler 4, and the waste flue gas after heat exchange is sent to a chimney 12 to be discharged under the action of an induced draft fan 9.
The denitration reducing agent is ammonia gas, ammonia water or urea.
It should be noted that, in the present invention, the coke charging device and the coke discharging device that are associated with the dry quenching furnace 1, and the raw material supply facility, the powder discharge facility, the activated coke recycling facility, etc. that are associated with the primary dust collector 3, the secondary dust collector 6, the dry desulfurization device, the denitration reducing agent supply device 2, etc. are all the existing mature technologies, and belong to the technologies known to those skilled in the art, and are not described herein again.
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 (7)
1. A comprehensive recovery system for coking waste heat is characterized by comprising a coke oven waste flue gas introduction system, a heat exchanger I, a dry quenching furnace, a denitration reducing agent supply device, a primary dust remover, a waste heat boiler, a dry desulfurization device, a secondary dust remover, a heat exchanger II, an induced draft fan and a chimney; the coke oven waste flue gas introducing system comprises a coke oven main flue and a flue turning plate, wherein a waste flue gas outlet is formed in the coke oven main flue, and the flue turning plate is arranged on the coke oven main flue between the waste flue gas outlet and a chimney; the waste flue gas outlet is connected with a waste flue gas inlet of the first heat exchanger through a waste flue gas pipeline, and a waste flue gas outlet of the first heat exchanger is connected with a gas supply device at the lower part of the dry quenching furnace; a waste flue gas outlet at the upper part of the dry quenching furnace is sequentially connected with a primary dust remover, a waste heat boiler, a dry desulphurization device, a secondary dust remover, a heat exchanger II, a fan and a chimney through a waste flue gas conveying pipeline; along the flowing direction of the waste flue gas, a denitration reducing agent spraying inlet is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover and is connected with a denitration reducing agent supply device through a reducing agent supply pipeline.
2. The comprehensive recovery system for coking waste heat according to claim 1, wherein the primary dust collector is a gravity dust collector.
3. The comprehensive recovery system for coking waste heat according to claim 1, wherein the dry desulphurization device is an SDS sodium based dry desulphurization device, and the NaHCO is arranged in the SDS sodium based dry desulphurization device3Supply means by NaHCO3The spraying pipe is connected with the waste flue gas conveying pipeline.
4. The comprehensive recovery system for coking waste heat according to claim 1, wherein the dry desulphurization device is an active coke dry desulphurization device.
5. The comprehensive recovery system for coking waste heat according to claim 1, wherein the heat exchanger is provided with a desalted water inlet and a desalted water outlet, and the desalted water inlet and the desalted water outlet are respectively connected with an economizer of the waste heat boiler through desalted water pipelines.
6. The comprehensive recovery system for coking waste heat according to claim 1, wherein the second heat exchanger is provided with a waste flue gas inlet, a waste flue gas outlet, a desalted water inlet and a desalted water outlet, the waste flue gas inlet is connected with a waste flue gas conveying pipeline at the upstream of the second heat exchanger, and the waste flue gas outlet is connected with a waste flue gas conveying pipeline at the downstream of the second heat exchanger; the demineralized water inlet and the demineralized water outlet are respectively connected with the economizer of the waste heat boiler through demineralized water pipelines.
7. The comprehensive recovery system of coking waste heat according to claim 1, wherein the secondary dust collector is a bag type dust collector, and a dust collecting device is arranged at the bottom of the bag type dust collector.
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| CN201921363879.0U CN210595918U (en) | 2019-08-21 | 2019-08-21 | Coking waste heat comprehensive recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110484283A (en) * | 2019-08-21 | 2019-11-22 | 中冶焦耐(大连)工程技术有限公司 | A kind of coking residual heat integrative recovery process and system |
| CN110484283B (en) * | 2019-08-21 | 2024-04-26 | 中冶焦耐(大连)工程技术有限公司 | Comprehensive recovery process and system for coking waste heat |
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2019
- 2019-08-21 CN CN201921363879.0U patent/CN210595918U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110484283A (en) * | 2019-08-21 | 2019-11-22 | 中冶焦耐(大连)工程技术有限公司 | A kind of coking residual heat integrative recovery process and system |
| CN110484283B (en) * | 2019-08-21 | 2024-04-26 | 中冶焦耐(大连)工程技术有限公司 | Comprehensive recovery process and system for coking waste heat |
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