CN204522754U - A kind of coke oven combustion exhaust gas denitration system - Google Patents
A kind of coke oven combustion exhaust gas denitration system Download PDFInfo
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- CN204522754U CN204522754U CN201520208609.8U CN201520208609U CN204522754U CN 204522754 U CN204522754 U CN 204522754U CN 201520208609 U CN201520208609 U CN 201520208609U CN 204522754 U CN204522754 U CN 204522754U
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Abstract
The utility model discloses a kind of coke oven combustion exhaust gas denitration system, wherein, this system comprises: reducing agent storage device, reducing agent jetting device and denitration catalyst oxidant layer; Wherein: reducing agent jetting device is positioned at coke oven regenerator, 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, 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; It is the region of 280 DEG C-800 DEG C, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven three regions that described denitration catalyst oxidant layer is arranged in accumulation of heat indoor temperature.Compared with prior art, because the temperature of denitration catalyst oxidant layer present position is higher, can adopt the denitrating catalyst being applicable to higher temperature, this denitrating catalyst price is lower, therefore, can reduce denitration cost.
Description
Technical field
The utility model relates to coke oven combustion waste gas purification field, particularly a kind of coke oven combustion exhaust gas denitration system.
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 above-mentioned prior art, because the temperature at loop smoke pipe 7 place is lower, generally at 260 DEG C, the denitration carrying out coke oven combustion waste gas herein needs to adopt the denitrating catalyst being suitable for low temperature, and this catalyst price general charged is higher, makes denitration cost higher.
Utility model content
For solving the problem, the utility model embodiment discloses a kind of coke oven combustion exhaust gas denitration system.
Technical scheme is as follows:
A kind of coke oven combustion exhaust gas denitration system, comprising: reducing agent storage device, reducing agent jetting device and denitration catalyst oxidant layer; Wherein:
Reducing agent jetting device is positioned at coke oven regenerator, 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, 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;
It is the region of 280 DEG C-800 DEG C, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven three regions that described denitration catalyst oxidant layer is arranged in accumulation of heat indoor temperature.
Alternatively, described reducing agent jetting device is specially: at least one reducing agent sprays into pipeline.
Alternatively, also comprise: instrument control device, described instrument control device is for controlling described first stop valve.
Alternatively, described reducing agent is ammonia-containing gas or contains ammonia liquid.
Alternatively, checker brick are provided with in described regenerator; Described denitration catalyst oxidant layer is positioned at the region that accumulation of heat indoor temperature is 280 DEG C-800 DEG C, is specially:
Described denitration catalyst oxidant layer is with replace the form of at least one deck checker brick to be positioned at region that accumulation of heat indoor temperature is 280 DEG C-800 DEG C.
Alternatively, 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.
The technical solution of the utility model, on the basis of the existing process units of coal chemical enterprise, by increasing reducing agent storage device, reducing agent jetting device is increased in coke oven regenerator, and be the region of 280 DEG C-800 DEG C in accumulation of heat indoor temperature, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven in three regions is provided with denitration catalyst oxidant layer, 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, realize first time denitration, reacted coke oven combustion waste gas is through denitration catalyst oxidant layer, react with denitrating catalyst, realize second time denitration, compared with prior art, because the temperature of denitration catalyst oxidant layer present position is higher, generally all more than 260 DEG C, therefore, can adopt the denitrating catalyst being applicable to higher temperature, this denitrating catalyst price is lower, therefore, can reduce denitration cost, meanwhile, the utility model removes the nitrogen oxide of coke oven combustion waste gas by twice denitration, makes the coke oven combustion waste gas finally entering air can reach the discharge standard of country.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment 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 embodiments more of the present utility model, 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;
The structural representation of the first coke oven combustion exhaust gas denitration system that Fig. 2 provides for the utility model;
The structural representation of the second coke oven combustion exhaust gas denitration system that Fig. 3 provides for the utility model;
The structural representation of the third coke oven combustion exhaust gas denitration system that Fig. 4 provides for the utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1
The first coke oven combustion exhaust gas denitration system that Fig. 2 provides for the utility model, can comprise: reducing agent storage device 01, reducing agent jetting device 03 and denitration catalyst oxidant layer 06; 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, described connecting pipe is provided with the first stop valve 04, and described denitration catalyst oxidant layer 06 is positioned at the region that regenerator 02 temperature is 280 DEG C-800 DEG C.
In actual applications, denitration catalyst oxidant layer 06 is with replace the form of at least one deck checker brick to be positioned at region that accumulation of heat indoor temperature is 300 DEG C-800 DEG C.
Embodiment 2
The second coke oven combustion exhaust gas denitration system that Fig. 3 provides for the utility model, can comprise: reducing agent storage device 01, reducing agent jetting device 03 and denitration catalyst oxidant layer 06; 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, described connecting pipe is provided with the first stop valve 04, and described denitration catalyst oxidant layer 06 is positioned at coke oven waste gas disk 07 bottom.
Embodiment 3
The third coke oven combustion exhaust gas denitration system that Fig. 4 provides for the utility model, can comprise: reducing agent storage device 01, reducing agent jetting device 03 and denitration catalyst oxidant layer 06; 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, described connecting pipe is provided with the first stop valve 04, and described denitration catalyst oxidant layer 06 is positioned at small flue duct of coke oven 08.
In the above embodiments 1-3, denitration catalyst oxidant layer 06 be lay respectively at accumulation of heat indoor temperature be 280 DEG C-800 DEG C region, in coke oven waste gas disk bottom and small flue duct of coke oven; Be understandable that, in actual application, can be according to actual needs, denitration catalyst oxidant layer 06 is all placed in two positions in above-mentioned three positions or three positions, such as, be that the region of 280 DEG C-800 DEG C and coke oven waste gas disk bottom are equipped with denitration catalyst oxidant layer 06 in accumulation of heat indoor temperature.Specifically which position to place denitration catalyst oxidant layer 06 in, can be determined according to the situation of reality by those skilled in the art, the utility model does not do concrete restriction at this.
It should be noted that, in embodiment 1-3, 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. 2-4 is a kind of schematic diagram just, and its specific implementation form the utility model 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, coke oven combustion chamber 05 above the coke oven regenerator 02 of embodiment 1-3, 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, first stop valve 04 of embodiment 1-3 can by controlling manually, but in order to realize the automation of producing, in a kind of preferred embodiment of the present utility model, 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 utility model 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 a kind of preferred embodiment of the present utility model, connecting pipe between first stop valve 04 and reducing agent storage device 01 of embodiment 1-3 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.
A crucial part of the present utility model 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 utility model 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 utility model 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.
Another crucial part of the present utility model is the position of catalyst layer, namely needs the temperature province of 280 DEG C-800 DEG C to arrange catalyst layer.In actual application, can in coke oven regenerator 02, temperature be the region of 280 DEG C-800 DEG C, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven in three regions is provided with denitration catalyst oxidant layer.One skilled in the art will appreciate that the temperature in coke oven waste gas disk and small flue duct of coke oven generally can reach more than 300 DEG C; Therefore, when above-mentioned position arranges denitration catalyst oxidant layer, the reaction of nitrogen oxides of active component ammonia ability preferably and in coke oven exhaust gas in reducing agent, conversion of nitrogen oxides is become nitrogen, realize the denitration of coke oven combustion waste gas, make the extent of reaction of ammonia and nitrogen oxide higher, coke oven combustion exhaust gas denitration carries out more thorough.
It should be noted that, the catalyst in the denitration catalyst oxidant layer 06 in embodiment 1-3 can be the commercial catalysts that any one is suitable for carrying out denitration at the temperature of 280 DEG C-800 DEG C, such as, can adopt V
2o
5-WO
3(MoO
3)/TiO
2the commercial denitrating catalyst of SCR of series.This denitrating catalyst is with TiO
2for base material, with V
2o
5for main active ingredient, with WO
3, MoO
3for anti-oxidant, antitoxinization auxiliary ingredients.Catalyst pattern can be board-like, honeycomb fashion and corrugated plate dst etc.Certainly, those skilled in the art can select denitrating catalyst according to practical condition, and the utility model does not do concrete restriction at this.
Embodiment 4
The coke oven combustion exhaust gas denitration system of corresponding embodiment 1-3 above, the utility model additionally provides a kind ofly applies 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, carry out first time denitration, reacted coke oven combustion waste gas is through denitration catalyst oxidant layer 06, react with denitrating catalyst, carry out second time denitration.Wherein, the active component in described reducing agent is ammonia.Coke oven combustion waste gas after denitration is finally discharged from chimney.
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.
Another crucial part of this method is the position of catalyst layer, namely needs the temperature province of 280 DEG C-800 DEG C to arrange catalyst layer.In actual application, can in coke oven regenerator 02, temperature be the region of 280 DEG C-800 DEG C, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven in three regions is provided with denitration catalyst oxidant layer.One skilled in the art will appreciate that the temperature in coke oven waste gas disk and small flue duct of coke oven generally can reach more than 300 DEG C; Therefore, when above-mentioned position arranges denitration catalyst oxidant layer, the reaction of nitrogen oxides of active component ammonia ability preferably and in coke oven exhaust gas in reducing agent, conversion of nitrogen oxides is become nitrogen, realize the denitration of coke oven combustion waste gas, make the extent of reaction of ammonia and nitrogen oxide higher, coke oven combustion exhaust gas denitration carries out more thorough.
It should be noted that, the catalyst in the denitration catalyst oxidant layer 06 in this method can be the commercial catalysts that any one is suitable for carrying out denitration at the temperature of 280 DEG C-800 DEG C, such as, can adopt V
2o
5-WO
3(MoO
3)/TiO
2the commercial denitrating catalyst of SCR of series.This denitrating catalyst is base material with TiO2, with V
2o
5for main active ingredient, with WO
3, MoO
3for anti-oxidant, antitoxinization auxiliary ingredients.Catalyst pattern can be divided into three kinds: board-like, honeycomb fashion and corrugated plate dst etc.Certainly, those skilled in the art can select denitrating catalyst according to practical condition, and the utility model does not do concrete restriction at this.
It should be noted that, as long as said reducing agent comprises active component ammonia in the utility model, 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 the technical solution of the utility model 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 150mg/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 utility model, be not intended to limit protection domain of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection domain of the present utility model.
Claims (6)
1. a coke oven combustion exhaust gas denitration system, is characterized in that, comprising: reducing agent storage device, reducing agent jetting device and denitration catalyst oxidant layer; Wherein:
Reducing agent jetting device is positioned at coke oven regenerator, 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, 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;
It is the region of 280 DEG C-800 DEG C, at least one region in coke oven waste gas disk bottom and small flue duct of coke oven three regions that described denitration catalyst oxidant layer is arranged in accumulation of heat indoor temperature.
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, is provided with checker brick in described regenerator; Described denitration catalyst oxidant layer is positioned at the region that accumulation of heat indoor temperature is 280 DEG C-800 DEG C, is specially:
Described denitration catalyst oxidant layer is with replace the form of at least one deck checker brick to be positioned at region that accumulation of heat indoor temperature is 280 DEG C-800 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772039A (en) * | 2015-04-08 | 2015-07-15 | 北京华泰焦化工程技术有限公司 | Coke oven combustion exhaust denitration system and coke oven combustion exhaust denitration method |
-
2015
- 2015-04-08 CN CN201520208609.8U patent/CN204522754U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772039A (en) * | 2015-04-08 | 2015-07-15 | 北京华泰焦化工程技术有限公司 | Coke oven combustion exhaust denitration system and coke oven combustion exhaust denitration method |
| CN104772039B (en) * | 2015-04-08 | 2017-12-05 | 北京华泰焦化工程技术有限公司 | A kind of coke oven combustion exhaust gas denitration system and method |
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Address after: 100176 Fifth Floor 501, Building 15, No. 2, No. 31 Courtyard, Kechuang Thirteenth Street, Daxing Economic and Technological Development Zone, Beijing Patentee after: HUATAI YONGCHUANG (BEIJING) TECHNOLOGY Co.,Ltd. Address before: 101318 14-C, Hui Hui Garden, B zone, Shunyi District airport industry, Beijing Patentee before: BEIJING HUATAI COKING ENGINEERING CONSULTING Corp. |
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