CN104524959A - Coke oven combustion waste gas denitration system and method - Google Patents
Coke oven combustion waste gas denitration system and method Download PDFInfo
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- CN104524959A CN104524959A CN201410841602.XA CN201410841602A CN104524959A CN 104524959 A CN104524959 A CN 104524959A CN 201410841602 A CN201410841602 A CN 201410841602A CN 104524959 A CN104524959 A CN 104524959A
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- reducing agent
- coke oven
- jetting device
- regenerator
- stop valve
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Abstract
The embodiment of the invention discloses a coke oven combustion waste gas denitration system and method. The system comprises a reducing agent storage device and a reducing agent jetting device located inside a coke oven heat storage chamber and connected with the reducing agent storage device outside the coke oven heat storage chamber through a connecting pipeline, and a first stop valve is arranged on the connecting pipeline. Compared with the prior art, because different denitration technologies are adopted, a denitration catalytic device is not needed; according to the technical scheme, the construction investment is small, the operation cost is low and a small area of land is occupied.
Description
Technical field
The present invention relates to coke oven combustion waste gas purification field, particularly a kind of coke oven combustion exhaust gas denitration system and method.
Background technology
Coal chemical enterprise can produce a large amount of coke oven combustion waste gas in process of production, and coke oven combustion waste gas mentioned here refers to the gas that mixed combustion in coke oven vertical flame path produces by coal gas and air.Containing a large amount of nitrogen oxide (NO in the coke oven combustion waste gas produced
x).The coke oven combustion waste gas of present each coal chemical enterprise all needs to enter air through flue, regenerator, bottom flue, waste gas exchange shutter, point flue, main chimney flue, chimney, wherein regenerator is positioned in the middle part of coke oven body is the unit of Mist heat recovering, and the direct discharge of coke oven combustion waste gas causes severe contamination to environment.China's regulation was from 1 day January in 2015, and existing coal chemical enterprise must perform GB16171-2012 discharge standard.That is, the coke oven combustion waste gas that coal chemical enterprise produces later has to pass through denitration (i.e. denitrifying oxide) process before discharge.
In the prior art, the denitration of coke oven combustion waste gas is all that main chimney flue place utilizes catalysis technique and carries out denitration according to fluidization principle after coke oven combustion exhaust gas disc.Fig. 1 is a kind of structural representation of existing coke oven combustion exhaust gas denitration system, and the coke oven combustion waste gas that coke oven combustion chamber 2 produces enters coke oven flue gas main chimney flue 3 by coke oven regenerator 1, exhaust gas disc 12.On coke oven flue gas main chimney flue 3, UNICOM arranged side by side loop smoke pipe 7, loop smoke pipe 7 is disposed with denitration catalyst device 8 and air-introduced machine 9, and the arrival end of loop smoke pipe and the port of export are provided with the first stop valve 6 and the second stop valve 10.Denitrification reducing agent and ammoniacal liquor or ammonia enter loop smoke pipe 7 between the first stop valve 6 and denitration catalyst device 8, and denitration catalyst device 8 is built with catalyst layer.Coke oven combustion waste gas removes the nitrogen oxide (NO in flue gas under the effect of reducing agent and catalyst
x), and discharge from chimney 5.
In the prior art above-mentioned, the denitration of coke oven combustion waste gas is all that main chimney flue place utilizes catalysis technique and carries out denitration according to fluidization principle after coke oven waste gas disk, in denitrating technique, the ammonia that reducing agent adopts coal chemical enterprise ammonia still process workshop section to produce mostly, as reducing agent, utilizes catalyst layer composite construction can nitrogen oxide in low burnt gas as denitration means.Adopt above-mentioned denitrating technique, need to increase denitrating catalyst, and need to set up large discharge high-temperature blower to overcome Catalytic Layer resistance, therefore cause the construction investment of this technology large, operating cost is high, takes up an area large.
Summary of the invention
For solving the problem, the embodiment of the invention discloses a kind of coke oven combustion exhaust gas denitration system and method.Technical scheme is as follows:
A kind of coke oven combustion exhaust gas denitration system, can comprise: reducing agent storage device, reducing agent jetting device; Wherein, reducing agent jetting device is positioned at coke oven regenerator, and described reducing agent jetting device is connected with the reducing agent storage device of coke oven regenerator outside by connecting pipe, and described connecting pipe is provided with the first stop valve.
In the preferred embodiment of the present invention, described reducing agent jetting device is specially: at least one reducing agent sprays into pipeline.
In the preferred embodiment of the present invention, also comprise: instrument control device, described instrument control device is for controlling described first stop valve.
In the preferred embodiment of the present invention, described reducing agent is ammonia-containing gas or contains ammonia liquid.
In the preferred embodiment of the present invention, the reducing agent outlet of described reducing agent jetting device is positioned at the region that coke oven regenerator temperature is 850 DEG C-1100 DEG C.
In the preferred embodiment of the present invention, described reducing agent jetting device outer setting protection chuck, has the air of flowing or water for lowering the temperature for reducing agent jetting device in described protection chuck.
Simultaneously, the invention also discloses a kind of application rights and require that the system described in 1 carries out the method for coke oven combustion exhaust gas denitration, comprise: when the coke oven combustion waste gas generated enters coke oven regenerator from the top of coke oven regenerator, when making that in coke oven regenerator, primary air flows downward, open the first stop valve, reducing agent in reducing agent storage device is introduced in reducing agent jetting device, and by the reducing agent outlet of reducing agent jetting device, reducing agent is injected in coke oven regenerator, reaction of nitrogen oxides in active component in the reducing agent sprayed and coke oven combustion waste gas, conversion of nitrogen oxides is become nitrogen, realize coke oven combustion exhaust gas denitration, wherein, active component in described reducing agent is ammonia.
In the preferred embodiment of the present invention, by the reducing agent outlet of reducing agent jetting device, reducing agent is injected in coke oven regenerator, is specially:
By the reducing agent outlet of reducing agent jetting device, reducing agent being injected to temperature in coke oven regenerator is the region of 850 DEG C-1100 DEG C.
In the preferred embodiment of the present invention, described system also comprises: instrument control device, and described instrument control device is for controlling the open and close of described first stop valve; Described method is specially: when coke oven regenerator primary air flows downward, the first stop valve is opened by described instrument control device; Described method also comprises: when coke oven regenerator primary air upwards flows, the first stop valve cuts out by described instrument control device.
Technical scheme of the present invention, on the basis of the existing process units of coal chemical enterprise, by increasing reducing agent storage device, and in coke oven regenerator, increase reducing agent jetting device, just can realize after the coke oven combustion waste gas generated enters coke oven regenerator from the top of coke oven regenerator, reducing agent in reducing agent storage device is introduced in reducing agent jetting device, and to be injected to temperature in coke oven regenerator by the outlet of the reducing agent of reducing agent jetting device be the region of 850 DEG C-1100 DEG C, make the active component in reducing agent and the reaction of nitrogen oxides in coke oven combustion waste gas, conversion of nitrogen oxides is become nitrogen, realize coke oven combustion exhaust gas denitration, reach the discharge standard of country.Compared with prior art, owing to have employed different denitrating techniques, do not need to arrange denitration catalyst device, therefore technical scheme construction investment of the present invention is little, and operating cost is lower, takes up an area little.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of coke oven combustion exhaust gas denitration system architecture schematic diagram of existing coke oven denitrating technique;
Fig. 2 is the structural representation of the first coke oven combustion exhaust gas denitration system provided by the invention;
Fig. 3 is the structural representation of the second coke oven combustion exhaust gas denitration system provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is a kind of coke oven combustion exhaust gas denitration system provided by the invention, can comprise: reducing agent storage device 01, reducing agent jetting device 03; Wherein, reducing agent jetting device 03 is positioned at coke oven regenerator 02, and the outlet of the reducing agent of reducing agent jetting device 03 is positioned at the region that coke oven regenerator 02 temperature is 850 DEG C-1100 DEG C, reducing agent jetting device 03 is connected by the reducing agent storage device 01 of connecting pipe with coke oven regenerator 02 outside, and described connecting pipe is provided with the first stop valve 04.
It should be noted that, reducing agent storage device 01 can be determined according to the concrete form of reducing agent by those skilled in the art, such as when reducing agent is liquid, reducing agent storage device 01 just can adopt accordingly for the device of storage of liquids, can also configure reducing agent gasification installation.When reducing agent is gaseous state, reducing agent storage device 01 just can adopt corresponding for storing the device of gas.
It should be noted that further, the reducing agent jetting device 03 shown in Fig. 1 is a kind of schematic diagram just, and the present invention of its specific implementation form does not need to limit.As long as the former also agent in reducing agent storage device 01 can be incorporated in coke oven regenerator 02 by it, and reducing agent to be injected to temperature in coke oven regenerator 02 be the region of 850 DEG C-1100 DEG C.
In the production process of reality, it is coke oven combustion chamber 05 above coke oven regenerator 02, coke oven combustion waste gas is generated after coal gas and air mixed combustion in coke oven combustion chamber 05, after this coke oven combustion waste gas enters coke oven regenerator 02 recovery section heat from the flue of coke oven combustion chamber 05, then discharge enters bottom flue bottom coke oven regenerator 02.After coke oven exhaust gas has discharged, coal gas and air enter coke oven combustion chamber 05 flue after absorbing heat by coke oven regenerator 02 has again burnt.
In coke oven regenerator 02, spray into opportunity in order to reducing agent jetting device 03 can be controlled easily, need installation first stop valve 04.First stop valve 04 controls reducing agent jetting device 03 and opens when primary air flows downward in coke oven regenerator 02, closes when in coke oven regenerator 02, primary air upwards flows.
In actual production process, this first stop valve 04 can by controlling manually, but in order to realize the automation of producing, in the preferred embodiment of the present invention, this system can also comprise: instrument control device, and described instrument control device is for controlling this first stop valve 04 described.Like this, save artificial on the one hand, control also can be made on the other hand more accurate.It should be noted that, the specific embodiment of above-mentioned instrument control device can adopt related art scheme of the prior art to realize, and the present invention does not do concrete restriction at this.
In the process of actual production, sometimes because the reasons such as maintenance need the operation stopping whole exhaust gas denitration system, now need reducing agent storage device 01 and reducing agent jetting device 03 to separate completely.Although close the first stop valve 04 also can play effect reducing agent storage device 01 and reducing agent jetting device 03 separated, but in order to prevent because the first stop valve 04 is malfunctioning and cause adverse consequences, in the preferred embodiment of the present invention, as shown in Figure 2, connecting pipe between described first stop valve 04 and reducing agent storage device 01 also comprises the second stop valve 06, second stop valve 06 and can also control reducing agent jetting device 03 sprays into amount from reducing agent to coke oven regenerator 02.
Crucial part of the present invention is, the reducing agent outlet of reducing agent jetting device 03 is positioned at the region that coke oven regenerator 02 temperature is 850 DEG C-1100 DEG C, preferably, the reducing agent outlet of reducing agent jetting device 03 is positioned at the region that coke oven regenerator 02 temperature is 900 DEG C-1000 DEG C.The particular location of this region in coke oven regenerator 02 can be determined according to the concrete form of the condition of production of reality and coke oven regenerator 02 by those skilled in the art, and the present invention does not do concrete restriction at this.Preferably, described reducing agent jetting device can be: at least one reducing agent sprays into pipeline.The quantity that reducing agent sprays into pipeline can be determined according to the concrete form of coke oven regenerator and the amount of coke oven exhaust gas that produces by those skilled in the art, and the present invention does not do concrete restriction at this.Be understandable that, because reducing agent jetting device 03 is in the higher working environment of temperature, therefore, reducing agent jetting device 03 can adopt high temperature resistant material, such as can adopt the stainless steel 310S material of tolerance 1000 DEG C, a thermal insulation chuck can be increased in the outside of this reducing agent jetting device 03 when material cannot adapt to high temperature, pass into the cooling-air of cooling or water in the middle of the chuck to ensure the normal work of reducing agent jetting device 03.
After above-mentioned coke oven combustion exhaust gas denitration system, coke oven combustion waste gas can remove nitrogen oxide (NO wherein
x), and enter coke oven flue gas main chimney flue by exhaust gas disc 07, finally discharge from chimney.
Coke oven combustion exhaust gas denitration system above corresponding, present invention also offers and a kind ofly apply the method that above-mentioned system carries out coke oven combustion exhaust gas denitration, can comprise: when the coke oven combustion waste gas generated enters coke oven regenerator 02 from the top of coke oven regenerator 02, when accumulation of heat indoor air flow is flowed downward, open the first stop valve 04, reducing agent in reducing agent storage device 01 is introduced in reducing agent jetting device 03, and to be injected to temperature in coke oven regenerator 02 by the outlet of the reducing agent of reducing agent jetting device 03 be the region of 850 DEG C-1100 DEG C, reaction of nitrogen oxides in active component in the reducing agent sprayed and coke oven combustion waste gas, conversion of nitrogen oxides is become nitrogen, realize coke oven combustion exhaust gas denitration, coke oven combustion waste gas after denitration is discharged bottom coke oven regenerator 02.Wherein, the active component in described reducing agent is ammonia.
What the crucial part of this method was reducing agent sprays into position, and namely in coke oven regenerator 02, temperature is that the region of 850 DEG C-1100 DEG C sprays into reducing agent.Only have at this temperature, the active component ammonia in reducing agent could when there is no catalyst with the reaction of nitrogen oxides in coke oven combustion waste gas, conversion of nitrogen oxides is become nitrogen, realizes coke oven combustion exhaust gas denitration.Preferably, in coke oven regenerator 02, temperature is that the region of 900 DEG C-1000 DEG C sprays into reducing agent, and the extent of reaction of ammonia and nitrogen oxide can be made higher, and coke oven combustion exhaust gas denitration carries out more thorough.
It should be noted that, as long as said reducing agent comprises active component ammonia in of the present invention, and other composition can not damage the reaction of ammonia and nitrogen oxide, and that is, reducing agent can be selected ammonia-containing gas or contain ammonia liquid.Be understandable that, the content of the ammonia in reducing agent is higher, and the efficiency of reaction is also higher, and the amount of required reducing agent is also lower.Therefore preferred, reducing agent is ammonia or liquefied ammonia.Consider economic factor, the ammoniacal liquor that preferred employing coal chemical enterprise ammonia still process workshop section produces or the ammonia that ammonia still process tower top is discharged, when the ammonia utilizing ammonia still process tower top to discharge, ammonia still system can as reducing agent storage device 01.
Adopt technical scheme of the present invention to carry out coke oven combustion exhaust gas denitration, the content of the coke oven combustion nitrogen oxides of exhaust gas of final discharge can be made to be less than 200mg/m
3, lower than the GB16171-2012 discharge standard of country.
It should be noted that, each embodiment in this description all adopts relevant mode to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for embodiment of the method, because it is substantially similar to system embodiment, so description is fairly simple, relevant part illustrates see the part of system embodiment.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (9)
1. a coke oven combustion exhaust gas denitration system, is characterized in that, comprising: reducing agent storage device, reducing agent jetting device; Wherein, reducing agent jetting device is positioned at coke oven regenerator, and described reducing agent jetting device is connected with the reducing agent storage device of coke oven regenerator outside by connecting pipe, and described connecting pipe is provided with the first stop valve.
2. the system as claimed in claim 1, is characterized in that, described reducing agent jetting device is specially: at least one reducing agent sprays into pipeline.
3. the system as claimed in claim 1, is characterized in that, also comprises: instrument control device, and described instrument control device is for controlling described first stop valve.
4. the system as claimed in claim 1, is characterized in that, described reducing agent is ammonia-containing gas or contains ammonia liquid.
5. the system as claimed in claim 1, is characterized in that, the reducing agent outlet of described reducing agent jetting device is positioned at the region that coke oven regenerator temperature is 850 DEG C-1100 DEG C.
6. the system as claimed in claim 1, is characterized in that, described reducing agent jetting device outer setting protection chuck, has the air of flowing or water for lowering the temperature for reducing agent jetting device in described protection chuck.
7. an application rights requires that the system described in 1 carries out the method for coke oven combustion exhaust gas denitration, it is characterized in that, comprise: when the coke oven combustion waste gas generated enters coke oven regenerator from the top of coke oven regenerator, when making that in coke oven regenerator, primary air flows downward, open the first stop valve, reducing agent in reducing agent storage device is introduced in reducing agent jetting device, and by the reducing agent outlet of reducing agent jetting device, reducing agent is injected in coke oven regenerator, reaction of nitrogen oxides in active component in the reducing agent sprayed and coke oven combustion waste gas, conversion of nitrogen oxides is become nitrogen, realize coke oven combustion exhaust gas denitration, wherein, active component in described reducing agent is ammonia.
8. method as claimed in claim 7, is characterized in that, is injected in coke oven regenerator, is specially by the reducing agent outlet of reducing agent jetting device by reducing agent:
By the reducing agent outlet of reducing agent jetting device, reducing agent being injected to temperature in coke oven regenerator is the region of 850 DEG C-1100 DEG C.
9. method as claimed in claim 7, it is characterized in that, described system also comprises: instrument control device, and described instrument control device is for controlling the open and close of described first stop valve; Described method is specially: when coke oven regenerator primary air flows downward, the first stop valve is opened by described instrument control device; Described method also comprises: when coke oven regenerator primary air upwards flows, the first stop valve cuts out by described instrument control device.
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| CN201410841602.XA CN104524959A (en) | 2014-12-30 | 2014-12-30 | Coke oven combustion waste gas denitration system and method |
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| CN201410841602.XA CN104524959A (en) | 2014-12-30 | 2014-12-30 | Coke oven combustion waste gas denitration system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105126582A (en) * | 2015-08-11 | 2015-12-09 | 北京神雾环境能源科技集团股份有限公司 | Coking flue gas denitration method and denitration system |
| CN105169918A (en) * | 2015-09-29 | 2015-12-23 | 中冶焦耐工程技术有限公司 | Method and system for reducing emission of nitrogen oxide in smoke of coking furnace |
| CN106893602A (en) * | 2017-04-27 | 2017-06-27 | 广州绿华环保科技有限公司 | A kind of coke oven combustion exhaust gas denitration device and its method of denitration |
| CN110105971A (en) * | 2019-06-18 | 2019-08-09 | 华泰永创(北京)科技股份有限公司 | A kind of coke oven regenerator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105126582A (en) * | 2015-08-11 | 2015-12-09 | 北京神雾环境能源科技集团股份有限公司 | Coking flue gas denitration method and denitration system |
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| CN106893602A (en) * | 2017-04-27 | 2017-06-27 | 广州绿华环保科技有限公司 | A kind of coke oven combustion exhaust gas denitration device and its method of denitration |
| CN106893602B (en) * | 2017-04-27 | 2022-12-30 | 广州绿华环保科技股份有限公司 | Coke oven combustion waste gas denitration device and denitration method thereof |
| CN110105971A (en) * | 2019-06-18 | 2019-08-09 | 华泰永创(北京)科技股份有限公司 | A kind of coke oven regenerator |
| CN110105971B (en) * | 2019-06-18 | 2024-01-26 | 华泰永创(北京)科技股份有限公司 | Coke oven regenerator |
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Application publication date: 20150422 |