CN210855981U - Dry quenching coke and coke oven flue gas combined purification system - Google Patents
Dry quenching coke and coke oven flue gas combined purification system Download PDFInfo
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- CN210855981U CN210855981U CN201921362852.XU CN201921362852U CN210855981U CN 210855981 U CN210855981 U CN 210855981U CN 201921362852 U CN201921362852 U CN 201921362852U CN 210855981 U CN210855981 U CN 210855981U
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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
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Abstract
The utility model relates to a coke dry quenching and coke oven flue gas combined purification system, which comprises a coke oven waste flue gas introduction system, a heat exchanger I, a coke dry quenching furnace, a dry desulfurization device, a primary dust remover, a waste heat boiler, an SCR denitration device, a heat exchanger II, a secondary dust remover, a draught fan and a chimney; the utility model discloses with coke oven waste flue gas waste heat recovery and SOx/NOx control purification technology and dry coke quenching technology organic integration, when realizing red burnt waste heat and coke oven waste flue gas waste heat recovery, 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 and gas cleaning technical field especially relate to a dry coke quenching and coke oven flue gas combined purification system.
Background
In the production process of the coke oven, coal gas (blast furnace gas, coke oven gas or mixed gas) is combusted in a combustion chamber and simultaneously supplies heat to a carbonization chamber, high-temperature flue gas generated by combustion is discharged after heat exchange of a heat storage chamber, and the temperature of the flue gas reaches 200 ℃ and 300 ℃, so that the waste flue gas 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 process flow of sodium carbonate desulfurization and SCR denitration is mostly adopted for the purification of coke oven waste flue gas. The Selective Catalytic Reduction (SCR) is the most mature flue gas denitration technology at present, and uses a reducing agent (NH)3Urea) with NO selectively in the presence of a metal catalystxReaction to form N2And H2And O, so that the smoke meets the emission requirement. The mainstream SCR reactor is divided into medium-temperature (260-380 ℃) catalytic denitration and low-temperature (120-300 ℃) catalytic denitration. Because the distance of the coke oven waste flue gas is longer before the coke oven waste flue gas enters the desulfurization and denitrification device, the cooling is obvious due to the large heat dissipation capacity of the pipeline, and a flue gas heating system is required to be configured to ensure that the temperature of the coke oven waste flue gas meets the condition of SCR denitrification reaction.
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, environmental protection in 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 coke dry quenching and coke oven flue gas combined purification system organically fuses coke oven waste flue gas waste heat recovery and SOx/NOx control purification technology and coke dry quenching technology, when realizing red burnt waste heat and coke oven waste flue gas waste heat recovery, accomplishes the purification of coke oven waste flue gas, makes smoke emission satisfy national standard, reduces the atmosphere pollution.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the combined coke dry quenching and coke oven flue gas purifying system includes coke oven waste flue gas introducing system, heat exchanger I, dry quenching furnace, dry desulfurizing device and primary desulfurizing deviceThe system comprises a dust remover, a waste heat boiler, an SCR denitration device, a heat exchanger II, a secondary dust remover, a draught 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 coke oven waste 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 coke oven waste flue gas outlet and a chimney; the coke oven waste gas outlet is connected with a waste flue gas inlet of the first heat exchanger through a coke oven 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, an SCR (selective catalytic reduction) denitration device, a heat exchanger II, a secondary dust remover, an induced draft fan and a chimney through a waste flue gas conveying pipeline; NaHCO is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover along the flow direction of the waste flue gas3Spraying in, through NaHCO3Spraying pipeline is connected with NaHCO3Supply device, NaHCO3Spraying into the pipeline and NaHCO3The supply devices jointly form a dry desulfurization device.
And 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 primary dust remover is a gravity dust remover.
The secondary dust remover is a 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 is organically integrated in a waste heat recovery system, when improving coke oven waste flue gas waste heat recovery heat quality, increase dry quenching waste heat utilization ability, the SOx/NOx control purification treatment of coke oven waste flue gas has been realized, the configuration of relevant flue gas treatment equipment such as dust removal facility, fan and power facility has been reduced, the 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, and the flue gas environment suitable for medium-temperature SCR denitration catalytic reaction is formed by controlling the temperature of the coke oven waste flue gas behind the waste heat boiler, so that a heating system does not need to be additionally arranged, the cost of a denitration catalyst is reduced, and the denitration efficiency is improved;
3) after SCR denitration, the waste flue gas is purified by adopting a bag type dust removal device, the dust removal efficiency is high, and the concentration of dust discharged by a secondary dust remover is 10mg/m3The induced draft fan arranged behind the secondary dust collector does not need to be provided with a special wear-resistant measure, and compared with the traditional dry quenching circulating fan, the induced draft fan can obviously reduce the replacement and maintenance cost of the fan, reduce the failure rate and improve the stability of the dry quenching continuous operation;
4) the utility model discloses when carrying out SOx/NOx control purification treatment to coke oven exhaust fume, compare with current dry quenching technology, need not to consider the desulfurization problem of diffusing cycle gas, the gas of discharging into the chimney can reach the environmental protection standard requirement completely.
Drawings
FIG. 1 is a schematic structural diagram of a combined purification system for dry quenching and coke oven flue gas of the present invention.
In the figure: 1. the dry quenching furnace 2, the dry desulfurization device 3, the primary dust remover 4, the waste heat boiler 5, the SCR denitration device 6, the secondary dust remover 7, the dust collecting device 8, the heat exchanger I9, the induced draft fan 10, the heat exchanger I11, the coke oven main flue 12, the chimney 13, the flue turning plate 14, the high-temperature coke
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in figure 1, the coke dry quenching and coke oven flue gas combined purification system comprises a coke oven waste flue gas introduction system, a heat exchanger I10, a dry quenching furnace 1,The system comprises a dry desulfurization device 2, a primary dust remover 3, a waste heat boiler 4, an SCR denitration device 5, a heat exchanger II 8, a secondary dust remover 6, an induced draft 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 coke oven waste gas outlet is arranged on the coke oven main flue 11, and the flue turning plate 13 is arranged on the coke oven main flue 11 between the coke oven waste flue gas outlet and a chimney 12; the coke oven waste gas outlet is connected with a waste flue gas inlet of a heat exchanger I10 through a coke oven waste flue gas pipeline, and a waste flue gas outlet of the heat exchanger I10 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, an SCR denitration device 5, a heat exchanger II 8, a secondary dust remover 6, an induced draft fan 9 and a chimney 12 through a waste flue gas conveying pipeline; NaHCO is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover 3 along the flow direction of the waste flue gas3Spraying in, through NaHCO3Spraying pipeline is connected with NaHCO3Supply device, NaHCO3Spraying into the pipeline and NaHCO3The feeding devices together constitute a dry desulphurization device 2.
And the first heat exchanger 10 is provided with a demineralized water inlet and a demineralized water outlet which are respectively connected with the economizer of the waste heat boiler 4 through demineralized water pipelines.
A waste flue gas inlet, a waste flue gas outlet, a demineralized water inlet and a demineralized water outlet are formed in the heat exchanger II 8, 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 primary dust remover is a gravity dust remover.
The secondary dust remover 6 is a bag type dust remover.
The working principle of the coke dry quenching and coke oven flue gas combined purification system is as follows: the waste flue gas of the coke oven generated in the heating process of the coke oven is sent into a dry quenching furnace 1 after heat exchange and temperature reduction, the high-temperature coke 14 is cooled by heat exchange, the waste flue gas discharged from the dry quenching furnace 1 is dedusted by a primary deduster 3, and simultaneously, desulfurization is sprayed into the primary deduster 3Agent NaHCO3The desulfurized waste flue gas enters a waste heat boiler 4 to recover heat, and the waste heat boiler 4 controls the outlet temperature of the waste flue gas, so that the waste flue gas discharged after heat exchange directly enters an SCR denitration device 5 to carry out SCR denitration catalytic reaction; the denitrated waste flue gas is sent to a chimney 12 for discharging after heat exchange, temperature reduction and secondary dust removal.
The technical process of the coke dry quenching and coke oven flue gas combined purification 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 enters 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 to be sent to the waste heat boiler 4, and the coke oven waste flue gas after heat exchange 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 absorbing coke heat is discharged from the upper section of the dry quenching furnace 1 and then enters a primary dust remover 3, and cooled coke is discharged through a coke discharging system at the lower part of the dry quenching furnace 1;
4) dry desulfurization unit 2 with NaHCO3Spraying NaHCO into the primary dust remover 3 by the spraying pipeline3In a primary precipitator 3, NaHCO3With SO in waste flue gas2Fully contact to react to generate NaHSO3、Na2SO3Realizing SO in the waste flue gas2Removing; produced NaHSO3、Na2SO3And the coke powder carried by 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, 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, and the recycling of coking waste heat is realized; the waste flue gas after heat recovery by the waste heat boiler 4 directly enters the SCR denitration device 5 through a pipeline for denitration treatment;
6) the waste flue gas subjected to denitration treatment by the SCR denitration device 5 enters a second heat exchanger 8 for cooling treatment; 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 sent to the waste heat boiler 4, and the cooled waste flue gas is sent to the secondary dust remover 6;
7) in the secondary dust remover 6, solid particles and dust carried in the waste flue gas are removed by adopting a filtering and dust removing mode, the collected particles and dust are recycled by a dust collecting device 7 at the lower part of the secondary dust remover 6 and then discharged for treatment, and the waste flue gas after filtering and dust removing is sent to a chimney 12 by an induced draft fan 9 and then discharged.
With the utility model discloses in coke that coke dry quenching furnace 1 matches is packed into device, coke eduction gear and with the raw materials that equipment such as primary dust remover 3, secondary dust remover 6, dry process desulphurization unit 2, SCR denitrification facility 5 matches is supplied with facilities, powder eduction facilities, denitration catalyst regeneration facility etc. and is current mature technique, belongs to the known technique of technical personnel in the field, no longer gives unnecessary details here.
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 (5)
1. The coke dry quenching and coke oven flue gas combined purification system is characterized by comprising a coke oven waste flue gas introducing system, a heat exchanger I, a coke dry quenching furnace, a dry desulfurization device, a primary dust remover, a waste heat boiler, an SCR denitration device, a heat exchanger II, a secondary dust remover, 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 coke oven waste 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 coke oven waste flue gas outlet and a chimney; the coke oven waste gas outlet is connected with a heat exchanger I through a coke oven waste gas pipelineThe waste flue gas inlet of the heat exchanger I and the waste flue gas outlet of the heat exchanger I are 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, an SCR (selective catalytic reduction) denitration device, a heat exchanger II, a secondary dust remover, an induced draft fan and a chimney through a waste flue gas conveying pipeline; NaHCO is arranged on the waste flue gas conveying pipeline at the upstream of the primary dust remover along the flow direction of the waste flue gas3Spraying in, through NaHCO3Spraying pipeline is connected with NaHCO3Supply device, NaHCO3Spraying into the pipeline and NaHCO3The supply devices jointly form a dry desulfurization device.
2. The coke dry quenching and coke oven flue gas combined purification system as claimed in claim 1, wherein 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 a waste heat boiler through demineralized water pipelines.
3. The coke dry quenching and coke oven flue gas combined purification system as claimed in claim 1, wherein 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.
4. The combined coke dry quenching and coke oven flue gas purification system of claim 1, wherein the primary dust collector is a gravity dust collector.
5. The combined coke dry quenching and coke oven flue gas purification system of claim 1, wherein the secondary dust collector is a bag collector.
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| CN201921362852.XU CN210855981U (en) | 2019-08-21 | 2019-08-21 | Dry quenching coke and coke oven flue gas combined purification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110437849A (en) * | 2019-08-21 | 2019-11-12 | 中冶焦耐(大连)工程技术有限公司 | Dry coke quenching and coke oven flue gas combined purifying technique and system |
| PL445537A1 (en) * | 2021-07-01 | 2023-10-02 | Biuro Projektów Koksoprojekt Spółka Z Ograniczoną Odpowiedzialnością | Heat recovery system for coke oven battery firing |
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2019
- 2019-08-21 CN CN201921362852.XU patent/CN210855981U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110437849A (en) * | 2019-08-21 | 2019-11-12 | 中冶焦耐(大连)工程技术有限公司 | Dry coke quenching and coke oven flue gas combined purifying technique and system |
| CN110437849B (en) * | 2019-08-21 | 2024-04-26 | 中冶焦耐(大连)工程技术有限公司 | Dry quenching and coke oven flue gas combined purification process and system |
| PL445537A1 (en) * | 2021-07-01 | 2023-10-02 | Biuro Projektów Koksoprojekt Spółka Z Ograniczoną Odpowiedzialnością | Heat recovery system for coke oven battery firing |
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