CN106139897A - Coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and device - Google Patents

Coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and device Download PDF

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Publication number
CN106139897A
CN106139897A CN201510174816.0A CN201510174816A CN106139897A CN 106139897 A CN106139897 A CN 106139897A CN 201510174816 A CN201510174816 A CN 201510174816A CN 106139897 A CN106139897 A CN 106139897A
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gas
flue gas
flue
denitration
coke oven
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CN201510174816.0A
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朱华东
于宝会
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TIANJIN HUANENG ENERGY EQUIPMENT CO Ltd
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TIANJIN HUANENG ENERGY EQUIPMENT CO Ltd
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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
    • 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
    • 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
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

Coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and device.A kind of coke oven flue exhaust gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process, comprise the steps: 1. mix with coke oven flue gas by the flue gas of gas-fired furnace and mix with ammonia afterwards to more than 320 DEG C, completes denitration in entrance SCR denitration system；2. complete the flue gas after denitration to enter residual neat recovering system and carry out exhaust heat stepped utilization: using in waste heat being used for product as negative pressure benzene removal and ammonia still process thermal source, now flue-gas temperature is down to 160-170 DEG C；3. being down to the flue gas of 160-170 DEG C, enter ammonia desulfuration equipment desulfurization after smoke induced draught fan pressurizes, rear flue gas up to standard is through smoke stack emission, and byproduct ammonium sulfate delivers to sulfur ammonium workshop concentrate drying.The present invention, by integrated with waste heat recovery to stack gases denitration, desulfurization, both saved the consumption of coal gas and steam, and has reduced waste gas discharge and administer point, reduced handling and the discharge pressure of waste water simultaneously.

Description

Coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and device
Technical field
The present invention relates to field of Environment Protection, particularly to a kind of coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and equipment therefor.
Background technology
Coke oven flue waste gas is the product after coke oven heating system burning, and because of the type of furnace, coke oven fuel and the difference of coke oven load, the flue-gas temperature of coke oven main chimney flue is between 230～300 DEG C, and flue gas contains a large amount of heat energy.Meanwhile, containing substantial amounts of NO in coke oven flue gasXAnd SO2, NOXContent is 600～1200mg/Nm3Between；SO2Content is generally 60～150mg/Nm3, for the enterprise that organic sulfur content in feed coal is higher, the SO2 content in its coke oven flue waste gas is up to 350mg/Nm3, far beyond the limit value of effluent standard.Along with the enforcement of " coke oven atmosphere pollutants emission standards " (GB16171-2012), coke oven flue gas has arrived the stage of necessary improvement；And reduce discharging from industry energy conservation, reducing the needs of production cost, the waste heat in coke oven flue gas also must obtain efficient and rational utilization.
The denitrating flue gas method the most commonly used, Technical comparing is ripe is SCR (selective catalytic reduction) method.In SCR technique, NH3Make reducing agent, under the effect of catalyst, NOx is reduced to nitrogen and water, more than 320 DEG C, is typically capable of preferable denitration effect.But coke oven flue gas temperature is just below this temperature, for ensureing the properly functioning of denitration effect and denitrification apparatus, need separately to set gas-fired heater and stack gases is heated up.
Flue gas heats up and necessarily consumes a part of coke-stove gas, for this, waste heat be can be used for the negative pressure benzene removal during cokingization is produced and ammonia still process workshop section, take off benzene (tube furnace is by consuming heated by gas) and steam ammonia still process (traditional ammonia still process steam heats) replacing traditional tube furnace.Waste heat intrinsic to the heat of newly-increased gas-fired furnace and flue gas is carried out effective and reasonable utilization, on the one hand the waste heat in the coal gas heat energy of afterburning and flue gas effectively can be utilized, on the other hand may replace the tube furnace of original system, reduce waste gas emission point and administer point.
Negative pressure benzene removal technique is coke oven gas purification new technology, take off benzene with normal pressure compared with there is the advantages such as energy-conservation, reduction of discharging, environmental protection, synthesis energy saving rate more than 25%.It uses cycling hot oil-poor replacement steam to make thermal source, carries out de-benzene under negative pressure, during be not introduced into steam, greatly reduce the generation amount separating water,
The direct ammonia still process of flue gas, not only reduces steam consumption (0.2-0.3T steam/ton waste water), and reduces equivalent wastewater biochemical handling, reduces wastewater discharge about 25%.
Flue gas after waste heat recovery, uses the ammonia process of desulfurization (SO2), discharge after flue gas is up to standard, byproduct ammonium sulfate is delivered to sulfur ammonium workshop and is dried.
Summary of the invention
A kind of coke oven flue exhaust gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integrated apparatus and technique are it is an object of the invention to provide, by increasing gas-fired furnace, improve coke oven flue gas temperature, complete NO_x Reduction by Effective, then by exhaust heat stepped utilization, produce and ammonia still process for changing crude benzol in product, finally carry out the wet desulphurization of flue gas, it is achieved the pollution control of stack gases and comprehensive utilization.
For achieving the above object, the present invention is achieved through the following technical solutions: a kind of coke oven flue exhaust gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process, it is characterised in that: comprise the steps:
1. the flue gas of gas-fired furnace is mixed with coke oven flue gas and mix with ammonia after more than 320 DEG C, enter in SCR denitration system and complete denitration；
2. complete the entrance residual neat recovering system of the flue gas after denitration and carry out exhaust heat stepped utilization: first flue gas is heated to 240-250 DEG C as regenerator distillation thermal source using oil-poor for the heat come at the bottom of regenerator, and then oil-poor the 230-245 of being heated to DEG C of the cycling hot extracted out at the bottom of debenzolizing tower is delivered at the bottom of debenzolizing tower as debenzolizing tower thermal source by flue gas, the circulation ammonia waste water come at the bottom of ammonia still is heated to 120-130 DEG C and delivers to ammonia still as ammonia still process thermal source by last flue gas, and now flue-gas temperature is down to 160-170 DEG C；
3. being down to the flue gas of 160-170 DEG C, enter ammonia desulfuration equipment desulfurization after smoke induced draught fan pressurizes, rear flue gas up to standard is through smoke stack emission, and byproduct ammonium sulfate delivers to sulfur ammonium workshop concentrate drying.
Above-mentioned coke oven flue exhaust gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process equipment therefor, it is characterised in that: include gas-fired furnace, flue, SCR denitration system, residual neat recovering system, air-introduced machine and desulphurization system；The import of described flue connects with gas-fired furnace and coke oven underground flue respectively, the outlet of flue communicates with the import of described SCR denitration system, the outlet of described SCR denitration system communicates with the import of described residual neat recovering system, and the outlet of described residual neat recovering system is connected with regenerator, debenzolizing tower, ammonia still and air-introduced machine respectively；The outlet of described air-introduced machine and the inlet communication of described desulphurization system.
Above-mentioned residual neat recovering system includes the lean oil heater of regenerator cycling hot, the lean oil heater of debenzolizing tower cycling hot and recycling waste water heater.
Present invention have the advantage that and good effect:
1, invention increases heated by gas method, after the high-temperature flue gas that heated by gas produces mixes with coke oven flue gas, coke oven flue gas can be heated to more than 320 DEG C, after coke oven flue gas after heating enters back into SCR desulphurization system after mixing with ammonia, NOx is reduced to nitrogen and water such that it is able to realize preferable denitration effect under the effect of catalyst.
2, the flue gas after denitration is carried out waste heat negative pressure benzene removal and the direct deamination of waste heat by the present invention successively.Waste heat negative pressure benzene removal substitutes traditional tube furnace and takes off benzene, reduces the generation amount of crude benzol separation waste water；Substitute tube furnace, also reduce waste gas emission point, it is to avoid waste gas multiple spot is administered, reduce environmental protection facility investment.The direct deamination of waste heat instead of traditional steam ammonia still process, reduces coal gas and steam consumption, reduces biochemical water processing cost, reduces wastewater discharge.
3, the present invention finally carries out the wet desulphurization of flue gas, it is achieved thereby that the pollution control of stack gases and comprehensive utilization.
Accompanying drawing illustrates:
Fig. 1 is the process flow diagram of the present invention.
Detailed description of the invention:
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further:
As shown in the figure: a kind of coke oven flue exhaust gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and used device thereof, work process is:
1, from the high-temperature flue gas of gas-fired furnace 1, the waste gas of 230-300 DEG C extracted with coke oven underground flue 6 mixes to more than 320 DEG C at flue 7, then mixes with ammonia, enters and catalytic reduction reaction occurs in SCR denitration system 2, complete the removing of NOx, reduction NOXFor N2And H2O.Flue valve 8 is installed, for realizing the normal switching between underground flue 6 and flue 7 of the coke oven flue gas extraction from underground flue 6 and flue gas on described underground flue.
2, complete the flue gas of about 320 DEG C of denitration, enter residual neat recovering system 3, first pass through the lean oil heater of regenerator cycling hot, return to regenerator after oil-poor the 240-250 of being heated to DEG C of the heat will come at the bottom of regenerator, and distill thermal source as regenerator；And then flue gas enters the lean oil heater of debenzolizing tower cycling hot, delivers at the bottom of debenzolizing tower as debenzolizing tower thermal source after oil-poor the 230-245 of being heated to DEG C of the cycling hot will extracted out at the bottom of debenzolizing tower；Flue gas enters recycling waste water heater subsequently, delivers to ammonia still as ammonia still process thermal source after the circulation ammonia waste water come is heated to 120-130 DEG C at the bottom of ammonia still, and now flue-gas temperature is down to 160-170 DEG C.
3,160-170 DEG C of flue gas subsequently, pressurizes through smoke induced draught fan 5, enters desulphurization system 4, first through spraying cooling, enters back into desulfurizing tower, flue gas and the ammonia counter current contacting of spray, completes desulfurization, and neat stress discharges through chimney 9；The sulfur ammonium formed is delivered to Liu An workshop, coke-oven plant through underflow pump and is carried out concentrate drying.
The ammonia of ammonia still process in waste gas SCR denitration reducing agent ammonia of the present invention, desulfurization ammonia Jun Shi coke-oven plantization product.
The present invention is by integrated with waste heat recovery to stack gases denitration, desulfurization, and waste heat recovery organically combines with production technology, instead of gas pipe type furnace and the steam of ammonia still process of the de-benzene of tradition, both the consumption of coal gas and steam had been saved, and reduce waste gas discharge and administer point, reduce handling and the discharge pressure of waste water simultaneously.This technique can be widely applied to pollution control and the comprehensive utilization of coking production enterprise coke oven flue waste gas.

Claims (3)

1. the desulfurization of coke oven flue exhaust gas denitration and a UTILIZATION OF VESIDUAL HEAT IN integral process, its feature It is: comprise the steps:
1. the flue gas of gas-fired furnace is mixed with coke oven flue gas and mix with ammonia after more than 320 DEG C Close, enter in SCR denitration system and complete denitration；
2. complete the entrance residual neat recovering system of the flue gas after denitration and carry out exhaust heat stepped utilization: first Flue gas using at the bottom of regenerator come heat oil-poor be heated to 240-250 DEG C as regenerator distill thermal source, And then flue gas delivers to de-benzene by oil-poor for the cycling hot extracted out at the bottom of debenzolizing tower the 230-245 of being heated to DEG C As debenzolizing tower thermal source at the bottom of tower, the circulation ammonia waste water come at the bottom of ammonia still is heated to by last flue gas Delivering to ammonia still as ammonia still process thermal source for 120-130 DEG C, now flue-gas temperature is down to 160-170 DEG C；
3. it is down to the flue gas of 160-170 DEG C, after smoke induced draught fan pressurizes, enters ammonia process of desulfurization dress Putting desulfurization, rear flue gas up to standard is through smoke stack emission, and byproduct ammonium sulfate delivers to sulfur ammonium workshop concentrate drying.
2. a coke oven flue exhaust gas denitration desulfurization according to claim 1 and UTILIZATION OF VESIDUAL HEAT IN Integral process equipment therefor, it is characterised in that: include gas-fired furnace, flue, SCR Denitrating system, residual neat recovering system, air-introduced machine and desulphurization system；The import of described flue Connect with gas-fired furnace and coke oven underground flue respectively, the outlet of flue and described SCR The import of denitrating system communicates, the outlet of described SCR denitration system and described residual neat recovering system Import communicate, the outlet of described residual neat recovering system respectively with regenerator, debenzolizing tower, ammonia still process Tower and air-introduced machine connect；The outlet of described air-introduced machine and the inlet communication of described desulphurization system.
The desulfurization of coke oven flue exhaust gas denitration and UTILIZATION OF VESIDUAL HEAT IN integration the most according to claim 2 Technique equipment therefor, it is characterised in that: above-mentioned residual neat recovering system include regenerator cycling hot Lean oil heater, the lean oil heater of debenzolizing tower cycling hot and recycling waste water heater.
CN201510174816.0A 2015-04-14 2015-04-14 Coke oven flue gas denitration desulfurization and UTILIZATION OF VESIDUAL HEAT IN integral process and device Pending CN106139897A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107267163A (en) * 2017-07-11 2017-10-20 南京华电节能环保设备有限公司 A kind of coke oven flue waste gas afterheat recovery unit of integration desulfurization denitration
CN108704455A (en) * 2018-07-05 2018-10-26 安徽顺达环保科技股份有限公司 A kind of flue gas desulfurization denitration dust-removing technique
CN112619410A (en) * 2020-11-19 2021-04-09 北京科技大学 Coke oven flue gas SCR denitration and waste heat gradient utilization integrated system and process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107267163A (en) * 2017-07-11 2017-10-20 南京华电节能环保设备有限公司 A kind of coke oven flue waste gas afterheat recovery unit of integration desulfurization denitration
CN107267163B (en) * 2017-07-11 2023-11-03 南京华电节能环保股份有限公司 Coke oven flue waste gas waste heat recovery device of integrated desulfurization denitration
CN108704455A (en) * 2018-07-05 2018-10-26 安徽顺达环保科技股份有限公司 A kind of flue gas desulfurization denitration dust-removing technique
CN112619410A (en) * 2020-11-19 2021-04-09 北京科技大学 Coke oven flue gas SCR denitration and waste heat gradient utilization integrated system and process
CN112619410B (en) * 2020-11-19 2021-11-30 北京科技大学 Coke oven flue gas SCR denitration and waste heat gradient utilization integrated system and process

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Application publication date: 20161123