CN212758033U - SCR denitrification facility of soil remediation flue gas - Google Patents
SCR denitrification facility of soil remediation flue gas Download PDFInfo
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- CN212758033U CN212758033U CN201922297772.7U CN201922297772U CN212758033U CN 212758033 U CN212758033 U CN 212758033U CN 201922297772 U CN201922297772 U CN 201922297772U CN 212758033 U CN212758033 U CN 212758033U
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Abstract
The utility model discloses a SCR denitrification facility of soil remediation flue gas, including urea pump, urea injection system, urea dissolving tank, urea solution storage tank, SCR reactor, sound wave soot blower, SCR catalyst, pipeline, valve, compressed air pipeline, water pipe, import and export flue, flue baffle, bypass baffle, Pt100, pressure transmitter, switch board, PLC on the spot, wire and cable and cat ladder, platform, steel construction, the utility model discloses a denitration of SCR method, denitration reductant adopts urea; so that the denitration efficiency is over 66.7 percent; the method can realize the cultivation of the flue gas NOx emission concentration less than or equal to 50 mg/Nm; the flue gas denitration device is provided with an on-site PLC control system, and the running state is conveyed to the main control room by using optical fibers; after the denitration engineering is built and put into operation, no secondary pollution is generated; and the denitration facility strives for simple and direct process flow, convenient maintenance and operation, reliable control, reasonable equipment arrangement, compact structure, less investment, low operation cost and strong adaptability to flue gas load.
Description
Technical Field
The utility model relates to a flue gas handles relevant technical field, specifically is a SCR denitrification facility of soil remediation flue gas.
Background
At present, the SCR denitration technology is commonly adopted in China to treat nitrogen oxides, and diluted reducing agent (NH) is sprayed into a tail flue of a boiler3) Reducing agent (NH) under the action of catalyst in the effective temperature range of 320-400 DEG C3) With NO and NO in the flue gas2Reacting to produce harmless nitrogen (N)2) And water (H)2O) to achieve the NOx removal effect. Although the method can remove the nitrogen oxides in the industrial waste gas, the traditional SCR denitration device can not completely meet the higher and higher emission requirements, the traditional process can not effectively solve the problem of ammonia escape, the traditional method needs to heat the SCR denitration device, so that the catalyst reaches the ideal catalytic temperature, meanwhile, the traditional method cannot ensure complete reaction by utilizing ammonia and the industrial waste gas, the residual reducing agent after the reaction is inconvenient to recover, the cost is increased, and economic loss is caused.
Therefore, the method needs to realize that the emission concentration of the NOx in the kiln gas is lower than the local environment-friendly emission standard; of denitration apparatusThe efficiency is ensured to be more than 66.7 percent, no secondary pollution is generated after the denitration engineering is built and put into operation, the denitration facility strives for simple process flow, the maintenance and the operation are convenient, the equipment arrangement is reasonable, the structure is compact, the investment is low, the operation cost is low, and the adaptability to the load is strong; NOx emission concentration of the denitration device is less than or equal to 50mg/Nm after normal operation3。
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a SCR denitrification facility of soil remediation flue gas, in order to solve the traditional SCR denitrification facility that mentions in the above-mentioned background art and can not be competent at higher and higher emission completely and required, the escape of ammonia can not effectively be solved to traditional technology, and traditional approach need heat SCR denitrification facility, make the catalyst reach ideal catalytic temperature, traditional approach utilizes ammonia and industrial waste gas reaction can not guarantee that the reaction is complete simultaneously, remaining reductant recovery is inconvenient after the reaction, the cost is increased, the problem of economic loss has been caused.
In order to achieve the above object, the utility model provides a following technical scheme: an SCR denitration device for soil remediation flue gas comprises a urea pump, a urea injection system, a urea dissolving tank, a urea solution storage tank, an SCR reactor, an acoustic wave soot blower, an SCR catalyst, a pipeline, a valve, a compressed air pipeline, a water pipe, an inlet and outlet flue, a flue baffle, a bypass baffle, Pt100, a pressure transmitter, a power distribution cabinet, a local PLC, a wire cable, a ladder stand, a platform and a steel structure, wherein the urea pump is used for conveying the urea solution stored in the urea storage tank into the flue to be vaporized and decomposed into NH3 for denitration reaction, the urea pump is configured according to one use, the overflowing part is made of 304 stainless steel, the urea solution is injected into the flue gas by a spray gun at the position of 300-, The steel plates are welded to form a closed space, and a heat insulation material is arranged between the inner protective plate and the outer protective plate of the reactor; in order to support the catalyst, a supporting steel structure beam is arranged below each layer of catalyst, and the catalyst modules are arranged on the supporting beams in rows; the inlet of the reactor is provided with an air flow uniform distribution device, and the shell of the reactor is provided with a catalyst replacing door, a manhole door and a hole for installing a sound wave soot blower.
Preferably, the SCR reactor is arranged at a high dust-containing section at the outlet of the kiln; flue gas in the SCR reactor flows vertically downwards; the inlet of the SCR reactor is provided with an airflow uniform distribution device, the inlet section and the outlet section of the SCR reactor are provided with guide plates, and the inside of the SCR reactor is provided with a wear-resistant mechanism; the SCR reactor is provided with a heat preservation and dissipation layer, so that the temperature change of the flue gas passing through the reactor is less than 5 ℃; the number of layers and the structural type of the catalyst are as follows: the number of catalyst layers is arranged according to 2+ 1; the catalyst adopts a honeycomb type.
Preferably, denitrification facility sets up to honeycomb formula catalyst, disposes 1 denitration reactor, and 3 layers of catalyst arrangement modes are designed into to the reactor, and wherein the superiors are reserved layer, and the flue gas passes through the catalyst layer from top to bottom, and the catalyst adopts modular structure to reduce the time of changing the catalyst.
The utility model provides a SCR denitrification facility of soil remediation flue gas possesses following beneficial effect: the utility model adopts SCR denitration, and the denitration reducing agent adopts urea; so that the denitration efficiency is over 66.7 percent; the emission concentration of NOx in the flue gas is less than or equal to 50mg/Nm 3; the flue gas denitration device is provided with an on-site PLC control system, and the running state is conveyed to the main control room by using optical fibers; after the denitration engineering is built and put into operation, no secondary pollution is generated; and the denitration facility strives for simple and direct process flow, convenient maintenance and operation, reliable control, reasonable equipment arrangement, compact structure, less investment, low operation cost and strong adaptability to flue gas load.
Drawings
FIG. 1 is an overall frame diagram of the present invention;
FIG. 2 is a structural position diagram of the device of the present invention;
fig. 3 is a top view of the device structure according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-3, the utility model provides a technical solution: the utility model provides a SCR denitrification facility of soil remediation flue gas, includes urea pump, urea injection system, urea dissolving tank, urea solution storage tank, SCR reactor, sound wave soot blower, SCR catalyst, pipeline, valve, compressed air pipeline, water pipe, import and export flue, flue baffle, bypass baffle, Pt100, pressure transmitter, switch board, PLC on the spot, wire and cable and cat ladder, platform, steel construction.
The urea pump is used for conveying the urea solution stored in the urea storage tank into the flue for vaporization decomposition, the decomposed NH3 is used for denitration reaction, the urea pump is configured according to one use and one spare, the overflowing part is made of 304 stainless steel, the urea solution is sprayed into flue gas by a spray gun at the position of 400 ℃ in the kiln, and the urea solution is decomposed into ammonia gas which is then subjected to oxidation-reduction reaction in the subsequent SCR.
The reactor shell is an external structure containing a catalyst, a frame steel structure and a steel plate are welded to form a closed space, and in order to prevent the heat dissipation of flue gas, a heat insulation material is arranged between an inner protective plate and an outer protective plate of the reactor; in order to support the catalyst, a supporting steel structure beam is arranged below each layer of catalyst, and the catalyst modules are arranged on the supporting beams in rows; the inlet of the reactor is provided with an airflow uniform distribution device, the part which is easy to wear in the reactor is provided with an anti-abrasion measure, various reinforcing plates and brackets in the reactor are designed into a type which is difficult to deposit ash, meanwhile, the compensation measure of thermal expansion is considered, and a door for replacing a catalyst, a manhole door and a hole for installing a sound wave soot blower are arranged on a shell of the reactor.
The SCR reactor design takes into account the following aspects:
(1) the project is provided with 1 set of SCR reactor;
(2) the SCR reactor is arranged at a high dust-containing section at the outlet of the kiln;
(3) flue gas in the SCR reactor flows vertically downwards;
(4) the inlet of the SCR reactor is provided with an airflow uniform distribution device, the inlet section and the outlet section of the SCR reactor are provided with guide plates, and anti-abrasion measures are taken for easily-abraded parts in the SCR reactor;
(5) various reinforcing plates and supports in the SCR reactor are designed into a type which is not easy to deposit dust, and meanwhile, compensation measures of thermal expansion must be considered;
(6) the SCR reactor is subjected to heat preservation, so that the temperature change of flue gas passing through the reactor is less than 5 ℃;
(7) the design of the SCR reactor also needs to consider a hoisting mode and a hoisting device which are necessary for maintaining and replacing the internal catalyst;
(8) the SCR reactor should be able to withstand the operating temperature of 450 ℃ for not less than 5 hours without any damage;
(9) the number of layers and the structural type of the catalyst are as follows: the number of catalyst layers is arranged according to 2+ 1;
(10) denitration steelframe: the SCR steel structure frame is designed and installed by a supplier;
(11) catalyst: the catalyst adopts a honeycomb type;
(12) a soot blowing system: the soot blowing of the project adopts sound wave soot blowing.
The engineering denitration process selects honeycomb type catalysts, 1 denitration reactor is configured in the engineering, the reactor is designed into a 3-layer catalyst arrangement mode, the uppermost layer is a reserved layer, smoke passes through the catalyst layer from top to bottom, the catalysts are of a module structure, the specification is uniform, interchangeability is realized, the time for replacing the catalysts is reduced, the volume of the catalysts meets the requirements on denitration efficiency, ammonia escape rate and the like in performance guarantee before new catalysts are added, and the service life of the catalysts is about 24000 hours.
When the SCR denitration process is used, firstly, kiln smoke is led out from a flue, meanwhile, a reducing agent stored by a reducing agent supply system is injected into the flue through the injection of a reducing agent injection system, the reducing agent is injected into the flue and is converted into ammonia gas through vaporization and hydrolysis at the high temperature of 400 ℃ under the condition of 300-2And water, the flow velocity of flue gas in the reactor is designed on the premise of ensuring the service life of the catalyst and other performance assessment indexes, and the sectional area of the catalyst is selected according to the flow velocity of flue gas so as to obtain the optimal catalyst preventionThe blocking effect, the flow speed of the flue gas in the reactor is 3-4 m/s.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The SCR denitration device for the soil remediation flue gas is characterized by comprising a urea pump, a urea injection system, a urea dissolving tank, a urea solution storage tank, an SCR reactor, a sound wave soot blower, an SCR catalyst, a pipeline, a valve, a compressed air pipeline, a water pipe, an inlet-outlet flue, a flue baffle, a bypass baffle, Pt100, a pressure transmitter, a power distribution cabinet, an on-site PLC (programmable logic controller), a wire cable, a ladder stand, a platform and a steel structure, wherein the urea pump is used for conveying the urea solution stored in the urea storage tank into the flue for vaporization decomposition, and decomposed NH (NH) is formed3For denitration reaction, a urea pump is configured according to one use and one preparation, a 304 stainless steel material is adopted in an overflowing part, a spray gun is utilized to spray urea solution into flue gas at the position of 400 ℃ in a kiln, so that the flue gas is decomposed into ammonia gas and then undergoes oxidation-reduction reaction in subsequent SCR, a shell of the SCR reactor is an external structure containing a catalyst, a frame steel structure and a steel plate are welded to form a closed space, and a heat-insulating material is arranged between an inner protection plate and an outer protection plate of the reactor; in order to support the catalyst, a supporting steel structure beam is arranged below each layer of catalyst, and the catalyst modules are arranged on the supporting beams in rows; the inlet of the reactor is provided with an airflow uniform distribution device, and the shell of the SCR reactor is provided with a catalyst replacing door, a manhole door and a hole for installing a sound wave soot blower.
2. The SCR denitration device of soil remediation flue gas of claim 1, wherein: the SCR reactor is arranged at a high dust-containing section at the outlet of the kiln; flue gas in the SCR reactor flows vertically downwards; the inlet of the SCR reactor is provided with an airflow uniform distribution device, the inlet section and the outlet section of the SCR reactor are provided with guide plates, and the inside of the SCR reactor is provided with a wear-resistant mechanism; the SCR reactor is provided with a heat preservation and dissipation layer, so that the temperature change of the flue gas passing through the reactor is less than 5 ℃; the number of layers and the structural type of the catalyst are as follows: the number of catalyst layers is arranged according to 2+ 1; the catalyst adopts a honeycomb type.
3. The SCR denitration device of soil remediation flue gas of claim 1, wherein: the denitration device sets up to honeycomb formula catalyst, disposes 1 denitration reactor, and 3 layers of catalyst arrangement modes are designed into to the reactor, and wherein the superiors are the reservation layer, and the flue gas passes through the catalyst layer from top to bottom, and the catalyst adopts modular structure to reduce the time of changing the catalyst.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922297772.7U CN212758033U (en) | 2019-12-19 | 2019-12-19 | SCR denitrification facility of soil remediation flue gas |
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| CN201922297772.7U CN212758033U (en) | 2019-12-19 | 2019-12-19 | SCR denitrification facility of soil remediation flue gas |
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| CN212758033U true CN212758033U (en) | 2021-03-23 |
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Effective date of registration: 20220325 Address after: 102300 room a-4250, building 3, No.20 Yong'an Road, Shilong Economic Development Zone, Mentougou District, Beijing Patentee after: BEIJING SHOUKE XINGYE ENGINEERING TECHNOLOGY Co.,Ltd. Address before: 100043 81 Gucheng South Road, Shijingshan District, Beijing Patentee before: BEIJING SHOUHUA TECHNOLOGY DEVELOPMENT CO.,LTD. |
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Effective date of registration: 20230706 Address after: 100043 81 Gucheng South Road, Shijingshan District, Beijing Patentee after: BEIJING SHOUHUA TECHNOLOGY DEVELOPMENT CO.,LTD. Address before: 102300 room a-4250, building 3, No.20 Yong'an Road, Shilong Economic Development Zone, Mentougou District, Beijing Patentee before: BEIJING SHOUKE XINGYE ENGINEERING TECHNOLOGY Co.,Ltd. |