CN203196530U - SCR flue gas denitration device denitrating flue gas by utilization of urea - Google Patents
SCR flue gas denitration device denitrating flue gas by utilization of urea Download PDFInfo
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- CN203196530U CN203196530U CN 201320222080 CN201320222080U CN203196530U CN 203196530 U CN203196530 U CN 203196530U CN 201320222080 CN201320222080 CN 201320222080 CN 201320222080 U CN201320222080 U CN 201320222080U CN 203196530 U CN203196530 U CN 203196530U
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- flue gas
- urea
- ammonia
- temperature flue
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Abstract
The utility model discloses an SCR flue gas denitration device denitrating flue gas by the utilization of urea. The SCR flue gas denitration device comprises an absorption tower as a reaction zone, a high-temperature flue and a low-temperature flue, wherein the high-temperature flue is connected with the absorption tower, untreated flue gas is introduced into the high-temperature flue, and treated flue gas is discharged by the low-temperature flue. The high-temperature flue is connected with an ammonia gas supplying device, and the ammonia gas supplying device comprises an ammonia gas box heating the urea through hydrolysis, an ammonia gas pipe delivering ammonia gas to the high-temperature flue, and a urea supplying device delivering the urea to the ammonia gas box. Special fuel does not to be provided, and heating is performed with waste heat of the flue gas. While the temperature of the high-temperature flue gas is reduced, the decomposition process of urea liquid is improved, the SCR flue gas denitration device ensures that the supplying amount of the ammonia gas and the reaction demand amount of the ammonia gas in the absorption tower reach a balance, and the production amount of the ammonia gas further can be controlled through control over the temperature of the urea liquid.
Description
Technical field
The utility model relates to the steam power plant field, is specifically related to a kind of steam power plant flue gas SCR denitration device, the scheme that it utilizes water, hot dual mode decomposing urea to carry out denitration.
Background technology
Nitrogen oxide in the flue gas has received increasing concern as one of main atmosphere pollution, and it will become the another important pollution sources after sulfide.The SCR gas denitrifying technology is one of gas denitrifying technology that is most widely used at present, has that denitration efficiency is high, the selective advantage such as good, stable and reliable operation, and its operation principle is under 280-420 ℃ of temperature, the NO in the flue gas
XWith the reducing agent NH that sprays in the flue of upstream
3The reduction reaction occurs under catalyst action, generates N
2And H
2O etc.The SCR denitrating technique needs ammonia as reducing agent, and the utilization of ammonia generally has three kinds of forms: liquefied ammonia, urea, ammoniacal liquor.What result of use was best at present is liquefied ammonia, but because liquefied ammonia belongs to the high-risk product, it stores, transports all very inconvenience and all there are larger potential safety hazard in power plant and surrounding enviroment, therefore is eliminated gradually.Utilize the urea preparing ammonia that two kinds of methods are arranged usually: pyrolysis and hydrolysis.Hydrolyze method is decomposed urea with the form of the aqueous solution, mainly be to utilize extraneous thermal source to add 185 ℃ aqueous solution of urea about thermal decomposition 2.0MPa.But can generate some acid intermediate in the hydrolysis of urea process, such as aminoquinoxaline etc., the oxide-film that these compounds can the heavy damage stainless steel surfaces, higher its corrosivity of temperature is stronger.Pyrolysismethod is that the urea liquid after the direct Fast Heating atomizing decomposes, and mainly is to utilize fuel oil one class A fuel A as thermal source, the aqueous solution of urea of fast decoupled 40%-55% in the time of 450～600 ℃, it is nearly normal pressure pyrolysis, operating pressure is low, but needs to consume a large amount of thermals source, and operating cost is high.The ammonia that generates after urea pyrolysis and the hydrolysis passes into reactor and catalyst reaction, thereby realization denitrating flue gas, because input cost and operating cost that independent pyrolysis or hydrolysis system have strengthened denitrating technique, urea pyrolysis or hydrolysis process exist technology comparatively complicated simultaneously, the problems such as cost is higher are restricting it and are popularizing and development.
The utility model content
Urea is adopted the large problem of pyrolysis way energy resource consumption when solving in the prior art denitrating flue gas, the utility model provides a kind of and utilizes flue gas self heat heating urea solution and the SCR equipment for denitrifying flue gas of ammonia is provided, concrete scheme is as follows: a kind of SCR equipment for denitrifying flue gas that utilizes urea flue gas to be carried out denitration, comprise the absorption tower as reacting environment, the low temperature flue of flue gas after the high-temperature flue that passes into untreated flue gas that is connected with the absorption tower and discharge are processed, it is characterized in that, be connected with the ammonia feeding mechanism on the described high-temperature flue, described ammonia feeding mechanism comprises the ammonia case that urea is hydrolyzed and heats, carry the ammonia pipe of ammonia to high-temperature flue, to the urea supply device of ammonia case transport urea.
For improving reaction speed and the efficient of urea liquid: the bottom of described ammonia case is the hollow double-decker that supplies high-temperature flue gas to pass through, and the inside of described ammonia case is provided with the agitating device of agitated liquid.
Flow for accelerating ammonia: be provided with air exhauster on the described ammonia pipe.
For avoiding the reacted deposit of urea liquid to affect reaction effect: the bottom of described ammonia case is provided with liquid circulating pipe.
For improving the solution speed of urea: described urea supply device comprises the material storing box of depositing urea that connects successively, with the grinder that urea is pulverized, urea after pulverizing is sent into the conveyer of ammonia case.
For improving the mixed effect of flue gas and ammonia: be provided with the blender of mixed flue gas in the described high-temperature flue, described ammonia pipe is connected on the high-temperature flue that the blender flue gas enters the place ahead.
Avoid high-temperature flue gas that the absorption tower is caused damage: be provided with the flue gas heat exchange chamber on the rear high-temperature flue of described ammonia case, the high-temperature flue gas that heated the ammonia case enters the absorption tower by the flue gas heat exchange chamber.
This programme does not need the fuel that provides special, but utilize the waste heat of flue gas to heat, when reducing high-temperature flue-gas, improved the decomposable process of urea liquid, guarantee that the supply of ammonia and the reaction requirement in the absorption tower reach balance, can also realize controlling the growing amount of ammonia by the temperature of control urea liquid.
High-temperature flue gas during by two layer of space the urea liquid to internal layer heat, the reaction with aggravation urea makes the decomposition of urea quicker.Size by the control two layer of space can realize the time that high-temperature flue gas is detained, and is easy to control the amplitude of cooling high-temperature fume.Liquid circulating pipe is used for the liquid of ammonia case bottom is discharged, simultaneously water filling in the ammonia case.For making things convenient for the dissolving of urea, material storing box is quantitatively thrown in urea to grinder under the control of control program, after grinder grinds urea, be discharged into again on the conveyer, can fully mix through itrated compound and ammonia in the flue gas after mixing, more easily reaction improves denitration effect under catalyst action.
Description of drawings
Fig. 1 structural representation of the present utility model;
The structural representation of urea supply device in Fig. 2 the utility model;
Attached number in the figure explanation: 1-absorption tower, 101-high-temperature flue, 102-low temperature flue, 103-blender, 2-urea supply device, 201-ammonia pipe, 202-ammonia case, 203-two layer of space, 204-material storing box, 205-grinder, 206-conveyer, 207-agitating device, 3-flue gas heat exchange chamber.
The specific embodiment
As shown in Figure 1, the utility model utilizes urea flue gas to be carried out the SCR equipment for denitrifying flue gas of denitration, comprise the absorption tower 1 as reacting environment, the high-temperature flue that passes into untreated flue gas 101 that is connected with absorption tower 1 and the low temperature flue 102 of discharging the rear flue gas of processing, be connected with the ammonia feeding mechanism on the described high-temperature flue 101, described ammonia feeding mechanism comprises the ammonia case 202 that urea is hydrolyzed and heats, carry the ammonia pipe 201 of ammonia to high-temperature flue 11, to the urea supply device 2 of ammonia case 202 transport urea.
This programme is sent into urea in the ammonia case by the urea supply device and is hydrolyzed, and utilizes the high-temperature flue gas of being discharged by boiler that the ammonia case is heated, and the urea liquid in the ammonia case is heated up.Wherein urea at high temperature generates NH with the water reaction
3And CO
2, urea (CO(NH when temperature is higher than 60 ℃
2)
2) beginning hydrolysis, hydrolysis rate was accelerated when temperature reached 80 ℃, and sharp increase trend is arranged more than 145 ℃, and hydrolysis is more violent in the aqueous solution of urea of boiling.This programme is hydrolyzed urea and heats simultaneously, by the flow velocity of control high-temperature flue gas or the temperature that flow is controlled urea liquid in the ammonia case, makes reaction reach optimal effectiveness.High-temperature flue gas after the utilization is delivered in the absorption tower again.If the temperature of high-temperature flue gas meets the temperature that requires on absorption tower after the heat exchange, can remove on the high-temperature flue the flue gas that enters the absorption tower further heat sink or the heat-exchanger rig of cooling, reach when reducing high-temperature flue gas and take full advantage of again waste heat.The ammonia that urea decomposition goes out in the ammonia case passes in the high-temperature flue again, and enters the absorption tower, mixed NO in the absorption tower after flue gas mixes again
XWith NH
3The reduction reaction occurs under the effect of catalyst, generates N
2And H
2O, final N
2Be discharged in the atmosphere by low temperature flue with flue gas, other liquid or solid falls into the liquid storage tank of below, absorption tower.This programme does not need the fuel that provides special, but utilize the waste heat of flue gas to heat, when reducing high-temperature flue-gas, improved the decomposable process of urea liquid, guarantee that the supply of ammonia and the reaction requirement in the absorption tower reach balance, can also realize controlling the growing amount of ammonia by the temperature of control urea liquid.
As shown in Figure 2, for improving heating effect and do not affect the normal circulation of flue gas, the bottom of the utility model ammonia case 202 is the hollow two layer of space 203 that passes through for high-temperature flue gas, and the inside of described ammonia case 202 is provided with the agitating device 207 of agitated liquid.High-temperature flue gas during by two layer of space 203 urea liquid to internal layer heat, reaction with aggravation urea, make the decomposition of urea quicker, high-temperature flue gas is lowered the temperature by two layer of space the time, if the temperature of high-temperature flue gas meets the design temperature on absorption tower 1 after the cooling, the sprinkling equipment that then can remove flue gas heat exchange chamber 3 and high-temperature flue gas is further lowered the temperature.Size by control two layer of space 203 can realize the time that high-temperature flue gas is detained, and is easy to control the amplitude of cooling high-temperature fume.Concrete two layer of space 203 can be arranged on the middle part of ammonia case 202, also can arrange in bottom with ammonia case 202 is included in.Because urea liquid has corrosivity, need to adopt anti-corrosion material in the selection of concrete ammonia case 202, and the discharging of corresponding ammonia case inside deposition thing will be set in addition.For accelerating flowing of ammonia, be provided with air exhauster at ammonia pipe 201.Also corresponding air exhauster can be set on the high-temperature flue in addition, with the control time of staying of high-temperature flue gas in ammonia case two layer of space.Deposition for cleaning ammonia case 202 bottoms arranges liquid circulating pipe in the bottom of ammonia case 202, and liquid circulating pipe is used for the liquid of ammonia case bottom is discharged, simultaneously water filling in the ammonia case.For making things convenient for the dissolving of urea, described urea supply device 2 comprises the material storing box of depositing urea 204 that connects successively, with the grinder 205 that urea is pulverized, urea after pulverizing is sent into the conveyer 206 of ammonia case 202.Material storing box is quantitatively thrown in urea to grinder under the control of control program, after grinder grinds urea, be discharged on the conveyer again, and concrete conveyer 206 can be conveyer belt, screw feeder, funnel.In order to improve the uniformity of mixing of ammonia and flue gas, to improve in the absorption tower reaction speed and the efficient with catalyst, be provided with the blender 103 of mixed flue gas in the described high-temperature flue 101, described ammonia pipe 201 is connected on the high-temperature flue 101 that the blender flue gas enters the place ahead.Can fully mix through itrated compound and ammonia in the flue gas after mixing, more easily reaction improves denitration effect under catalyst action.For preventing because high-temperature flue gas can not fully lower the temperature and destroy the absorption tower, be provided with flue gas heat exchange chamber 3 on the high-temperature flue 101 at described ammonia case 202 rears, the high-temperature flue gas that heated ammonia case 202 enters absorption tower 1 by flue gas heat exchange chamber 3, the low-temperature flue gas of being discharged by absorption tower 1 low temperature flue 102 enters flue gas heat exchange chamber 3 and carries out heat exchange with high-temperature flue gas, corresponding spraying ventilating device also can be set high-temperature flue gas is lowered the temperature.
Embodiment 1: this programme is when work, after being placed on the urea process pulverizing of grinder in the material storing box, enter the ammonia case by conveyer belt, mix with the water in the ammonia case, utilize agitating device fully to stir in the process of mixing, to increase dissolution velocity, the high-temperature flue gas of being introduced by high-temperature flue simultaneously heats the mixed solution in the ammonia case by two layer of space, urea is dissolved under the effect of agitating device and heating, fully decomposes, and molecular formula is as follows:
NH
4COONH
2+H
2O→2NH3+CO
2
The ammonia that generates enters the high-temperature flue at rear again by the ammonia pipe, and by blender with enter the absorption tower after high-temperature flue gas fully mixes, mixing afterwards, flue gas reacts under the effect of absorption tower inner catalyst:
NO+CO（NH
2）
2+1/2O
2→2N
2+CO
2+2H
2O
The gas that generates is discharged in the atmosphere with the flue gas after purifying.If the flue-gas temperature that enters the absorption tower is more than 70 degree then need the high-temperature flue gas before entering the absorption tower is lowered the temperature again, to avoid damaging the absorption tower.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, although the utility model discloses as above with preferred embodiment, yet be not to limit the utility model, anyly be familiar with the technical staff of this patent within not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned prompting is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification all still belong in the scope of the utility model scheme.
Claims (7)
1. SCR equipment for denitrifying flue gas that utilizes urea flue gas to be carried out denitration, comprise the absorption tower (1) as reacting environment, the low temperature flue 102 of flue gas after the high-temperature flue that passes into untreated flue gas (101) that is connected with absorption tower (1) and discharge are processed, it is characterized in that, described high-temperature flue is connected with the ammonia feeding mechanism on (101), described ammonia feeding mechanism comprises the ammonia case (202) that urea is hydrolyzed and heats, carry the ammonia pipe (201) of ammonia to high-temperature flue (101), to the urea supply device (2) of ammonia case (202) transport urea.
2. SCR equipment for denitrifying flue gas as claimed in claim 1, it is characterized in that, the bottom of described ammonia case (202) is the hollow two layer of space (203) that supplies high-temperature flue gas to pass through, and the inside of described ammonia case (202) is provided with the agitating device (207) of agitated liquid.
3. SCR equipment for denitrifying flue gas as claimed in claim 1 is characterized in that, is provided with air exhauster on the described ammonia pipe (201).
4. SCR equipment for denitrifying flue gas as claimed in claim 1 is characterized in that, the bottom of described ammonia case (202) is provided with liquid circulating pipe.
5. SCR equipment for denitrifying flue gas as claimed in claim 1, it is characterized in that, described urea supply device (2) comprises the material storing box of depositing urea (204) that connects successively, with the grinder (205) that urea is pulverized, urea is sent into the conveyer (206) of ammonia case (202) after will pulverizing.
6. SCR equipment for denitrifying flue gas as claimed in claim 1 is characterized in that, is provided with the blender (103) of mixed flue gas in the described high-temperature flue (101), and described ammonia pipe (201) is connected on the high-temperature flue that the blender flue gas enters the place ahead.
7. SCR equipment for denitrifying flue gas as claimed in claim 6, it is characterized in that, be provided with flue gas heat exchange chamber (3) on the rear high-temperature flue (101) of described ammonia case (202), the high-temperature flue gas that heated the ammonia case enters absorption tower (1) by flue gas heat exchange chamber (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222080 CN203196530U (en) | 2013-04-27 | 2013-04-27 | SCR flue gas denitration device denitrating flue gas by utilization of urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222080 CN203196530U (en) | 2013-04-27 | 2013-04-27 | SCR flue gas denitration device denitrating flue gas by utilization of urea |
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| Publication Number | Publication Date |
|---|---|
| CN203196530U true CN203196530U (en) | 2013-09-18 |
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ID=49140672
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|---|---|---|---|
| CN 201320222080 Expired - Lifetime CN203196530U (en) | 2013-04-27 | 2013-04-27 | SCR flue gas denitration device denitrating flue gas by utilization of urea |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105129817A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method |
| CN111115659A (en) * | 2020-01-17 | 2020-05-08 | 济南山源环保科技有限公司 | Method and device for urea hydrolysis |
| CN114653198A (en) * | 2022-02-14 | 2022-06-24 | 华能南通燃机发电有限公司 | Flue gas denitration utilization device of gas turbine waste heat boiler |
| CN115990407A (en) * | 2023-03-23 | 2023-04-21 | 浙江天明环境工程有限公司 | Flue gas denitration system with spout ammonia device |
-
2013
- 2013-04-27 CN CN 201320222080 patent/CN203196530U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105129817A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method |
| CN111115659A (en) * | 2020-01-17 | 2020-05-08 | 济南山源环保科技有限公司 | Method and device for urea hydrolysis |
| CN114653198A (en) * | 2022-02-14 | 2022-06-24 | 华能南通燃机发电有限公司 | Flue gas denitration utilization device of gas turbine waste heat boiler |
| CN115990407A (en) * | 2023-03-23 | 2023-04-21 | 浙江天明环境工程有限公司 | Flue gas denitration system with spout ammonia device |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: CHINA DATANG GROUP ENVIRONMENT TECHNOLOGY CO.,LTD. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG ENVIRONMENT INDUSTRY GROUP Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130918 |
|
| CX01 | Expiry of patent term |