CN218459132U - Device for flue gas denitration by urea solution spraying and urea solution catalytic hydrolysis - Google Patents
Device for flue gas denitration by urea solution spraying and urea solution catalytic hydrolysis Download PDFInfo
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- CN218459132U CN218459132U CN202222396077.8U CN202222396077U CN218459132U CN 218459132 U CN218459132 U CN 218459132U CN 202222396077 U CN202222396077 U CN 202222396077U CN 218459132 U CN218459132 U CN 218459132U
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Abstract
The utility model relates to an utilize urea solution to spray and urea solution catalysis to hydrolyze the device that carries out flue gas denitration in coordination. The utility model discloses set up urea solution injection apparatus and urea solution catalysis equipment of hydrolysising respectively after urea solution holding vessel, set up liquid amine catalyst holding vessel and urea solution injection control module before urea solution injection apparatus, set up the catalyst holding vessel of hydrolysising before urea solution catalysis equipment of hydrolysising, set up ammonia air mixer after urea solution catalysis equipment of hydrolysising, set up urea solution hydrolysis control module on urea solution catalysis equipment of hydrolysising. The utility model discloses a urea solution of innovation sprays and urea solution catalysis is hydrolysised and is carried out flue gas denitration technology in coordination, during the system ammonia lag phase of urea solution catalysis hydrolysis, through control module's accurate control, in time start urea solution sprays technology, it in time compensaties the not enough of reductibility ammonia in the flue to spray technology system ammonia through urea solution, effectively prevent the escape of nitrogen oxide pollutant, played the purpose of in good time and accurate desorption to the nitrogen oxide pollutant, the reliability of deNOx systems has been improved by a wide margin. The system has the advantages of strong reliability, low operation cost, stable outlet parameters of nitrogen oxides, high removal rate and convenient system overhaul and operation maintenance, and is suitable for the cooperative efficient denitration and purification of boiler flue gas.
Description
Technical Field
The utility model relates to an utilize urea solution to spray and urea solution catalysis to hydrolyze the device that carries out flue gas denitration in coordination, especially relate to one kind by urea solution holding vessel, liquid amine catalyst holding vessel, urea solution injection apparatus, urea solution catalysis equipment of hydrolysising, ammonia air mixer, hydrolysis catalyst holding vessel, urea solution injection control module, urea solution hydrolysis control module component utilize urea solution to spray and urea solution catalysis is hydrolyzed and is carried out flue gas denitration in coordination.
Background
Denitration treatment of boiler flue gas is one of the mainstream technologies for controlling atmospheric pollution. In the technical development process, the precision and refinement of the process are the main direction of industrial technical development. Wherein, the requirement of the national energy agency for issuing the notice of the implementation scheme for centralized control of the dangerous chemical safety risk in the power industry (No. 2022 of national energy issue) 21 is that the engineering of replacing and transforming the primary and secondary major dangerous source urea of liquid ammonia in national public coal-fired power plants is completed before the end of 12 months in 2022 years, and the engineering of replacing and transforming the tertiary and quaternary major dangerous source urea of liquid ammonia is completed before the end of 2024 years.
The selective catalytic reduction flue gas denitration technology is a mainstream technology of industrial flue gas denitration at present, ammonia gas is used as a reducing agent, and nitrogen oxide is reduced into nitrogen gas and water under the action of a catalyst, so that the aims of denitration and purification are fulfilled. At present, two main technologies for producing ammonia by selective catalytic reduction denitration are liquid ammonia method and urea method. Because of the great potential safety hazard of liquid ammonia as the source of the denitration reducing agent, the technology for preparing ammonia from urea becomes more and more mainstream development technology.
The latest national policy requirements inevitably push the innovation and the upgrade of the flue gas denitration process. The urea solution injection and the urea solution catalytic hydrolysis are inevitably increasingly feasible processes for boiler flue gas denitration at present.
The urea solution injection is to directly inject the urea solution as a reducing agent into a high-temperature flue at the tail part of a boiler, and urea liquid drops are heated and decomposed into ammonia under the action of high temperature. And then, ammonia gas enters a selective catalytic reduction denitration unit filled with a catalyst through a middle-temperature flue at the tail part of the boiler, and the ammonia gas and nitrogen oxides in the flue gas undergo catalytic reduction reaction under the action of the catalyst of the denitration unit to generate harmless nitrogen and water, so that the aim of removing the nitrogen oxides is fulfilled. However, the urea solution injection process has the problems of poor injection quantity control accuracy and large urea consumption, and the urea solution, particularly the intermediate product, possibly has corrosion and scaling problems on a boiler flue, an economizer and other heat exchangers at high temperature, so that the urea solution injection process is not suitable for long-time operation and use.
The urea solution catalytic hydrolysis is to perform hydrolysis reaction on the urea solution under the action of a hydrolysis catalyst to generate ammonia gas, the ammonia gas is mixed by an ammonia-air mixer and then is sprayed into a medium-temperature flue in front of a selective catalytic reduction denitration unit, and then the ammonia gas and nitrogen oxides in flue gas perform catalytic reduction reaction under the action of a catalyst of the denitration unit to generate harmless nitrogen and water, so that the aim of removing the nitrogen oxides is fulfilled. Although in the urea solution catalytic hydrolysis ammonia production process, the urea utilization rate is high, and the system ammonia production rate is greatly improved, the system ammonia production reaction has certain hysteresis due to the existence of response speed, so that no reductive ammonia gas is available in a flue in a certain time, and nitrogen oxides are discharged into the atmospheric environment without being subjected to removal reaction, thereby bringing about the problems of fluctuation of nitrogen oxide outlet parameters and the like, and having no purification effect on nitrogen oxide pollutants in flue gas.
The utility model discloses high temperature corrosion scale deposit and the unsuitable long-term operation that exist to current urea solution injection technology to and the fluctuating scheduling problem of nitrogen oxide export parameter that the ammonia-making hysteresis that exists of urea catalysis hydrolysis brought, according to the adaptability of technology, carry out the innovation of technology and carry out the effect in coordination, carry out research and development to the key problem and the design parameter that utilize urea solution injection and urea solution catalysis hydrolysis to carry out flue gas denitration in coordination, and verify and perfect through industrialization application, important practical application and industry spreading value have.
The utility model discloses a urea solution of innovation sprays and urea solution catalysis is hydrolysised and is carried out flue gas denitration technology in coordination, during the system ammonia lag period of urea solution catalysis hydrolysis, through control module's accurate control, in time start urea solution sprays technology, it in time compensaties the not enough of reducing ammonia in the flue to spray technology system ammonia through urea solution, effectively prevents the escape of nitrogen oxide pollutant, has played the purpose of in good time and accurate desorption to the nitrogen oxide pollutant, the reliability of deNOx systems has been improved by a wide margin. Meanwhile, in the urea solution spraying process, the amine catalyst is innovatively used, so that the generation amount of corrosive intermediate products under a high-temperature condition is reduced, the ammonia production efficiency of urea liquid drops under the high-temperature condition is improved, the defects in the running process of the urea solution spraying process are avoided to the maximum extent, the use amount of the urea solution is reduced, and the running cost is reduced.
Disclosure of Invention
The utility model aims at providing an utilize urea solution to spray and urea solution catalysis to hydrolyze the method that carries out flue gas denitration in coordination, the adoption sets up urea solution injection apparatus and urea solution catalysis equipment of hydrolysising respectively after the urea solution holding vessel, set up liquid amine catalyst holding vessel and urea solution before urea solution injection apparatus and spray control module, set up the hydrolysis catalyst holding vessel before urea solution catalysis equipment of hydrolysising, set up ammonia air mixer after urea solution catalysis equipment of hydrolysising, set up one kind of urea solution control module of hydrolysising that utilizes urea solution to spray and urea solution catalysis to hydrolyze the method that carries out flue gas denitration in coordination on urea solution catalysis equipment of hydrolysising. The system has the advantages of strong reliability, low operation cost, stable outlet parameters of nitrogen oxides, high removal rate, convenient system maintenance and operation, and suitability for the cooperative efficient denitration and purification of boiler flue gas.
In order to achieve the purpose, the utility model discloses a boiler flue gas containing nitrogen oxide gets into selective catalytic reduction denitration unit through afterbody high temperature flue and the middle temperature flue of afterbody, and the flue gas after the purification is up to standard emits into the atmospheric environment.
In order to achieve the above object, the utility model discloses a urea solution injection apparatus is connected with afterbody high temperature flue to be connected with the urea solution holding vessel through urea solution pipeline one, set up the liquid amine catalyst holding vessel on urea solution pipeline one before urea solution injection apparatus. After the urea solution injection equipment is put into operation, the liquid amine catalyst storage tank adds the liquid amine catalyst into the urea solution pipeline I, and after mixing, the mixture is injected into a tail high-temperature flue through the urea solution injection equipment. The urea solution sprayed into the high-temperature flue and the amine mixture react together, so that on one hand, the generation amount of corrosive intermediate products under the high-temperature condition is reduced, on the other hand, the ammonia production efficiency of urea liquid drops under the high-temperature condition is improved, the defects in the running process of the urea solution spraying process are avoided to the maximum extent, the use amount of the urea solution is reduced, and the running cost is reduced. After entering the selective catalytic reduction denitration unit, the ammonia gas prepared from the urea is subjected to catalytic reduction reaction with the nitrogen oxides in the flue gas, so that the purposes of removing and purifying the nitrogen oxides in the flue gas are achieved.
In order to achieve the above purpose, the utility model discloses a urea solution catalysis hydrolysis equipment is connected with the urea solution holding vessel through urea solution pipeline two, sets up the catalyst holding vessel of hydrolysising before urea solution catalysis hydrolysis equipment, sets up ammonia air mixer after urea solution catalysis hydrolysis equipment, and ammonia air mixer is connected with afterbody middle temperature flue through mixer pipeline. After the urea solution catalytic hydrolysis device is put into operation, the hydrolysis catalyst storage tank adds the hydrolysis catalyst into the urea solution catalytic hydrolysis device through the hydrolysis catalyst conveying pipeline, the ammonia production speed by hydrolysis of the urea solution is improved under the action of the hydrolysis catalyst, the generated ammonia gas enters the ammonia-air mixer, the mixed gas is added into the tail middle-temperature flue through the mixed gas conveying pipeline, and then enters the selective catalytic reduction denitration unit to perform catalytic reduction reaction with the nitrogen oxides in the flue gas, so that the aim of removing and purifying the nitrogen oxides in the flue gas is fulfilled.
In order to achieve the purpose, the utility model discloses set up urea solution on urea solution pipeline one and spray control module, set up urea solution hydrolysis control module on urea solution catalytic hydrolysis equipment. The response speed of the urea solution catalytic hydrolysis reaction has hysteresis, namely the generation time of initial ammonia is generally delayed by more than five minutes, so that after a boiler is started to operate, the urea solution injection control module obtains a control signal through the linkage feedback of the urea solution hydrolysis control module within five minutes of the operation of the urea solution catalytic hydrolysis equipment, and urea solution injection equipment and a liquid amine catalyst storage tank connected to a urea solution pipeline I are started to operate in time from the start of the operation of the urea solution catalytic hydrolysis equipment to the five-minute operation of the urea solution catalytic hydrolysis equipment, and a urea solution and amine mixture is injected into a high-temperature flue at the tail part through the urea solution injection equipment to prepare ammonia for a selective catalytic reduction denitration unit to carry out a nitrogen oxide removal reaction so as to achieve the purpose of purifying nitrogen oxide pollutants.
The utility model discloses a liquid amine catalyst adopts 45% concentration's triethylene diamine's ethylhexanoic acid solution, this catalyst is to the flue material, the corrosivity of economizer and heat exchanger is low, high temperature ammonia production reaction to urea solution has stronger catalytic action, can improve urea ammonia production efficiency about 20%, can produce corrosive composition to urea solution under the high temperature condition simultaneously and play the inhibitory action, urea solution's use amount has not only been practiced thrift, the urea high temperature ammonia production reaction has been slowed down simultaneously to the flue, the corrosive action of economizer and other heat exchangers, the running cost has been reduced by a wide margin.
Compared with the prior art, the utility model has the characteristics of it is following:
(1) Because the innovative urea solution injection and urea solution catalytic hydrolysis are adopted to carry out the flue gas collaborative denitration process, during the lag period of the ammonia production of urea solution catalytic hydrolysis, the urea solution injection process is started in time through the accurate control of the control module, the ammonia production through the urea solution injection process makes up the deficiency of reducing ammonia in the flue in time, the escape of nitrogen oxide pollutants is effectively prevented, the purpose of timely and accurate removal of the nitrogen oxide pollutants is achieved, and the reliability of the denitration system is greatly improved.
(2) In the urea solution injection process, the amine catalyst is innovatively used, so that the generation amount of corrosive intermediate products under a high-temperature condition is reduced, the ammonia production efficiency of urea liquid drops under the high-temperature condition is improved, the defects in the urea solution injection process are avoided to the maximum extent, the usage amount of the urea solution is reduced, and the operation cost is greatly reduced.
(3) The utility model has the characteristics of overhaul and operation maintenance convenience etc.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the process flow of the present invention.
In the figure: 1. the system comprises a boiler, a tail high-temperature flue, a tail medium-temperature flue, a urea solution storage tank, a liquid amine catalyst storage tank, a urea solution injection device, a urea solution pipeline I7, a urea solution catalytic hydrolysis device 8, an ammonia-air mixer 9, a hydrolysis catalyst storage tank 10, a urea solution pipeline II 11, a hydrolysis catalyst conveying pipeline 12, a mixed gas conveying pipeline 13, a selective catalytic reduction denitration unit 14, a urea solution injection control module 15 and a urea solution hydrolysis control module 16.
Detailed Description
The utility model provides an utilize urea solution to spray and urea solution catalytic hydrolysis carries out device of denitration in coordination of flue gas, set up urea solution injection apparatus and urea solution catalytic hydrolysis equipment respectively after the urea solution holding vessel, set up liquid amine catalyst holding vessel and urea solution injection control module before urea solution injection apparatus, set up the hydrolysis catalyst holding vessel before urea solution catalytic hydrolysis equipment, set up ammonia air mixer after urea solution catalytic hydrolysis equipment, set up urea solution hydrolysis control module on urea solution catalytic hydrolysis equipment.
When the utility model discloses an utilize urea solution injection and urea solution catalysis to hydrolyze device that carries out flue gas denitration in coordination when being in operating condition, after the boiler start-up operation, within five minutes to the urea solution catalysis of the invention hydrolyzes equipment input operation, urea solution sprays control module and can obtain control signal through urea solution hydrolysis control module's chain feedback, from urea solution catalysis hydrolyzes equipment start operation, to the time interval of five minutes of input operation, in time start-up connects urea solution injection apparatus and the liquid amine catalyst holding vessel on urea solution pipeline one and put into operation, spout urea solution and amine mixture to afterbody high temperature flue through urea solution injection apparatus, the ammonia is prepared and is supplied selective catalytic reduction denitration unit to carry out nitrogen oxide desorption reaction, in order to reach the purpose of nitrogen oxide pollutant purification.
When the utility model discloses an utilize urea solution to spray and urea solution catalysis to hydrolyze when the device that carries out flue gas denitration in coordination is in operating condition, the urea solution and the amine mixture that spout high temperature flue react together, the formation volume of corrosivity intermediate product has been reduced under the high temperature condition on the one hand, on the other hand has promoted the ammonia production efficiency of urea liquid drop under the high temperature condition, make the defect that urea solution sprays the technology operation in-process avoid by furthest to reduce urea solution's quantity, reduced the running cost. After entering the selective catalytic reduction denitration unit, the ammonia gas prepared from the urea and the nitrogen oxide in the flue gas undergo catalytic reduction reaction, so that the aim of removing and purifying the nitrogen oxide in the flue gas is fulfilled.
When the utility model discloses an utilize urea solution to spray and urea solution catalytic hydrolysis to carry out flue gas when denitration in coordination device is in operating condition, after urea solution catalytic hydrolysis equipment is put into operation, hydrolysis catalyst holding vessel adds the hydrolysis catalyst to urea solution catalytic hydrolysis equipment through hydrolysis catalyst pipeline, under the effect of hydrolysis catalyst, urea solution's hydrolysis ammonia production speed can improve, the ammonia of production gets into ammonia air mixer, the mist is after the middle temperature flue of afterbody is added to the mist pipeline, get into selective catalytic reduction denitration unit, catalytic reduction takes place with the nitrogen oxide in the flue gas, thereby play the desorption and purify the purpose to the nitrogen oxide in the flue gas.
The utility model discloses a boiler flue gas containing nitrogen oxide gets into selective catalytic reduction denitration unit through afterbody high temperature flue and the middle temperature flue of afterbody, and the flue gas after the purification is up to standard emits into atmospheric environment.
The utility model discloses a liquid amine catalyst adopts 45% concentration's triethylene diamine's ethylhexanoic acid solution, this catalyst is to flue material, the corrosivity of economizer and heat exchanger is low, high temperature system ammonia reaction to urea solution has stronger catalytic action, can improve urea system ammonia efficiency about 20%, can produce corrosivity composition to urea solution under the high temperature condition simultaneously and play the inhibitory action, urea solution's use amount has not only been practiced thrift, the corrosive action of urea high temperature system ammonia reaction to flue, economizer and other heat exchangers has been slowed down simultaneously, the running cost has been reduced by a wide margin.
The above description is only for the specific embodiments of the present invention, the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art in the field of the present invention should be included in the claims of the present invention.
Claims (4)
1. The utility model provides an utilize urea solution to spray and urea solution catalytic hydrolysis carries out device of denitration in coordination of flue gas, mainly by urea solution holding vessel, liquid amine catalyst holding vessel, urea solution injection equipment, urea solution catalytic hydrolysis equipment, ammonia air mixer, hydrolysis catalyst holding vessel, urea solution injection control module, urea solution hydrolysis control module constitute its characterized in that: the urea solution injection device and the liquid amine catalyst storage tank are respectively connected with the urea solution storage tank, and the urea solution injection control module is respectively connected with the urea solution storage tank, the liquid amine catalyst storage tank and the urea solution injection device.
2. The device for the synergistic denitration of flue gas by utilizing the urea solution injection and the urea solution catalytic hydrolysis as claimed in claim 1, is characterized in that: and a liquid amine catalyst storage tank is arranged in front of the urea solution injection device along the flow direction of the urea solution.
3. The device for the synergistic denitration of flue gas by utilizing the urea solution injection and the urea solution catalytic hydrolysis as claimed in claim 1, is characterized in that: the urea solution injection control module is connected with the urea solution hydrolysis control module.
4. The device for the synergistic denitration of flue gas by utilizing the urea solution injection and the urea solution catalytic hydrolysis as claimed in claim 1, is characterized in that: the liquid amine catalyst is ethyl caproic acid solution of 45% concentration triethylene diamine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222396077.8U CN218459132U (en) | 2022-09-09 | 2022-09-09 | Device for flue gas denitration by urea solution spraying and urea solution catalytic hydrolysis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222396077.8U CN218459132U (en) | 2022-09-09 | 2022-09-09 | Device for flue gas denitration by urea solution spraying and urea solution catalytic hydrolysis |
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| CN218459132U true CN218459132U (en) | 2023-02-10 |
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| CN202222396077.8U Active CN218459132U (en) | 2022-09-09 | 2022-09-09 | Device for flue gas denitration by urea solution spraying and urea solution catalytic hydrolysis |
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