CN210171228U - Lithium bromide is arranged coupling deNOx systems in grades - Google Patents
Lithium bromide is arranged coupling deNOx systems in grades Download PDFInfo
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- CN210171228U CN210171228U CN201920352269.4U CN201920352269U CN210171228U CN 210171228 U CN210171228 U CN 210171228U CN 201920352269 U CN201920352269 U CN 201920352269U CN 210171228 U CN210171228 U CN 210171228U
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Abstract
The utility model relates to a lithium bromide is coupling deNOx systems arranged in grades belongs to internal-combustion engine function source station flue gas denitration field. The utility model discloses in, the export of internal-combustion engine arranges first order lithium bromide unit, medium temperature SCR reaction system, second level lithium bromide unit in proper order. One part of flue gas discharged by the internal combustion engine enters a first-stage lithium bromide unit for heat exchange refrigeration or heating, the other part of flue gas is mixed with the flue gas discharged by the first-stage lithium bromide unit through a bypass, the flow is regulated by a flow regulating valve to enable the mixing temperature to reach 340 +/-20 ℃, and then the mixed flue gas enters an SCR denitration reactor to complete denitration reaction. The utility model discloses in being applied to the internal-combustion engine denitration with the technology mature and the reliable denitration technique of economy, can reach the purpose of the high-efficient desorption of flue gas NOx, and less to lithium bromide unit operation influence.
Description
Technical Field
The utility model discloses internal-combustion engine can source station flue gas denitration field especially involves the SCR flue gas denitration technique who is applicable to the high exhaust gas temperature of gas internal-combustion engine.
Background
The internal combustion engine takes natural gas or fuel oil as fuel, drives a generator to generate electricity through combustion, generates high-grade electric energy, the temperature of the exhaust gas after stable operation is generally above 400 ℃ (the normal operation temperature is about 450 ℃), the temperature of cylinder liner water of the internal combustion engine is above 90 ℃, in order to fully utilize the temperature of the exhaust gas and the cylinder liner water discharged by the internal combustion engine, a smoke hot water type lithium bromide unit is generally arranged behind the internal combustion engine, and the heat of the high-temperature smoke and the cylinder liner water is used as a heat source of the lithium bromide unit, so that summer refrigeration and winter heating are realized.
Because the combustion of the internal combustion engine adopts a piston compression ignition mode, the unit can not realize low-nitrogen combustion, so that the emission mass concentration of NOx in the exhaust gas is higher, generally 200mg/m3Above, the requirements for discharging pollutants in the atmosphere are far exceeded. In the increasingly serious form of atmospheric pollution, the mass concentration reduction of the emission of the atmospheric pollutants is urgent, and the emission of NOx is an important index in the emission of the atmospheric pollutants, so the mass concentration reduction of the emission of NOx of the internal combustion engine is also an important content of a triple co-generation system mainly based on the internal combustion engine.
The Selective Catalytic Reduction (SCR) is the mainstream technology for denitration in China at present and the principle is that NH is used under the action of a catalyst3Is a reducing agent, selectively reacts with NOx in the flue gas at high temperature to generate nitrogen and water which are nontoxic and pollution-free, for example, Chinese patent with application number of 201811200846.4. The temperature window of the common SCR catalyst (medium-temperature catalyst) is 300-400 ℃, and the exhaust gas temperature of the gas internal combustion engine exceeds the adaptive temperature range of the medium-temperature catalyst. Therefore, the flue gas of the internal combustion engine needs to be denitrated by adopting a high-temperature SCR catalyst (350-450 ℃), but the high-temperature SCR catalyst is high in price, high in operation and maintenance cost, and not mature in technology, and is difficult to popularize in large-scale engineering.
With the stricter emission standard of the atmospheric pollutants, the reduction of the emission concentration of the NOx of the internal combustion engine is an important content of a triple co-generation system mainly based on the internal combustion engine, and the traditional SCR technology is mature, has high denitration efficiency and low operation and maintenance cost, and is the first choice of the denitration modification technology. The window of the medium-temperature SCR denitration temperature is 300-400 ℃, the exhaust temperature of the internal combustion engine is generally higher than 400 ℃, and the medium-temperature catalyst runs in a long-term high-temperature environment, so that the denitration efficiency is not high, and the service life of the medium-temperature SCR catalyst is greatly shortened.
Therefore, how to apply the middle-temperature catalyst with mature technology and low investment and operation cost to the exhaust gas of the internal combustion engine with high smoke temperature is an important subject of current research.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a lithium bromide grading arrangement coupling deNOx systems, for solving above-mentioned problem, the utility model discloses with lithium bromide unit grading arrangement, medium temperature SCR deNOx systems arranges between the two-stage lithium bromide unit, creates the temperature window of medium temperature SCR denitration. The system can achieve an ideal denitration effect and does not influence the performance of the lithium bromide unit.
The utility model provides a technical scheme that above-mentioned problem adopted is: a lithium bromide graded arrangement coupling denitration system is characterized by comprising an internal combustion engine, a first-stage lithium bromide unit, a medium-temperature SCR denitration system, a second-stage lithium bromide unit and a chimney; the smoke exhaust outlet of the internal combustion engine, the first-stage lithium bromide unit, the medium-temperature SCR denitration system, the second-stage lithium bromide unit and the chimney are sequentially communicated, a smoke bypass is arranged on a smoke pipeline of the first-stage lithium bromide unit, the smoke bypass is communicated with the smoke exhaust outlet of the internal combustion engine and the inlet of the medium-temperature SCR denitration system, and a smoke flow control valve is arranged on the smoke bypass and used for controlling the smoke quantity and further controlling the smoke temperature at the inlet of the SCR denitration system; and a temperature sensor is arranged at the inlet of the medium-temperature SCR denitration system and is used for monitoring the flue gas temperature at the inlet of the SCR denitration system.
Further, the medium-temperature SCR denitration system comprises an SCR reactor and a reducing agent storage tank, wherein the SCR reactor is arranged between the first-stage lithium bromide unit and the second-stage lithium bromide unit, and the reducing agent storage tank is connected with the SCR reactor.
Further, a catalyst layer and an ammonia injection device are arranged in the SCR reactor, a reducing agent storage tank and a compressed air pump are both connected with the ammonia injection device, the reducing agent storage tank and the compressed air pump are arranged in parallel, and a reducing agent flow control valve is arranged at an inlet of the ammonia injection device.
Furthermore, a thin-walled catalyst with a high specific surface area is selected in the catalyst layer.
The working method of the lithium bromide graded coupling denitration system comprises the following steps: high-temperature flue gas is discharged from the internal combustion engine, one part of the flue gas enters a first-stage lithium bromide unit for heat exchange, and the other part of the flue gas is mixed with the flue gas at the outlet of the first-stage lithium bromide unit through a flue gas bypass and then enters an SCR reactor for denitration reaction; the reducing agent is supplied by the reducing agent storage tank and mixed with compressed air provided by a compressed air pump, the mixture is sprayed into the SCR reactor by the ammonia spraying device and mixed with flue gas, and then the mixture enters the catalyst layer to complete denitration reaction, and the amount of the reducing agent is controlled by the reducing agent flow control valve; the flue gas flow control valve controls the flow of flue gas in the flue gas bypass, and the temperature sensor monitors the temperature of the flue gas, so that the temperature of the flue gas entering the SCR reactor is maintained at 340 +/-20 ℃, and the flue gas after denitration reaction enters the second-stage lithium bromide unit and is finally discharged from a chimney.
Compared with the prior art, the utility model, have following advantage and effect:
1. the utility model discloses rational in infrastructure, arrange simple to operate.
2. The utility model discloses a medium temperature SCR denitration mode, it is with low costs, the denitration is efficient, the technology is mature and not big to lithium bromide unit influence to reform transform and operation maintenance.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: the device comprises an internal combustion engine 1, a flue gas flow control valve 2, a first-stage lithium bromide unit 3, a temperature sensor 4, a catalyst layer 5, an ammonia spraying device 6, a second-stage lithium bromide unit 7, a reducing agent flow control valve 8, a compressed air pump 9, a reducing agent storage tank 10, an SCR reactor 11 and a chimney 12.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the lithium bromide graded-arrangement coupled denitration system in the embodiment includes an internal combustion engine 1, a first-stage lithium bromide unit 3, a medium-temperature SCR denitration system, a second-stage lithium bromide unit 7, and a chimney 12.
The smoke exhaust outlet of the internal combustion engine 1, the first-stage lithium bromide unit 3, the medium-temperature SCR denitration system, the second-stage lithium bromide unit 7 and the chimney 12 are sequentially communicated, a smoke bypass is arranged on a smoke pipeline of the first-stage lithium bromide unit 3, the smoke bypass is communicated with the smoke exhaust outlet of the internal combustion engine 1 and the inlet of the medium-temperature SCR denitration system, and a smoke flow control valve 2 is arranged on the smoke bypass and used for controlling the smoke flow and further controlling the smoke temperature at the inlet of the SCR denitration system; the inlet of the medium-temperature SCR denitration system is provided with a temperature sensor 4 for monitoring the inlet flue gas temperature of the SCR denitration system.
The medium-temperature SCR denitration system comprises an SCR reactor 11 and a reducing agent storage tank 10, wherein the SCR reactor 11 is arranged between a first-stage lithium bromide unit 3 and a second-stage lithium bromide unit 7, and the reducing agent storage tank 10 is connected with the SCR reactor 11.
A catalyst layer 5 and an ammonia spraying device 6 are arranged in the SCR reactor 11, a reducing agent storage tank 10 and a compressed air pump 9 are both connected with the ammonia spraying device 6, the reducing agent storage tank 10 and the compressed air pump 9 are arranged in parallel, and a reducing agent flow control valve 8 is arranged at the inlet of the ammonia spraying device 6.
The catalyst layer 5 is a thin-wall catalyst with high specific surface area.
The working method of the lithium bromide graded coupling denitration system comprises the following steps: high-temperature flue gas is discharged from the internal combustion engine 1, one part of the flue gas enters the first-stage lithium bromide unit 3 for heat exchange, and the other part of the flue gas is mixed with the flue gas at the outlet of the first-stage lithium bromide unit 3 through a flue gas bypass and then enters the SCR reactor 11 for denitration reaction; the reducing agent storage tank 10 supplies a reducing agent to be mixed with compressed air provided by a compressed air pump 9, the reducing agent is sprayed into the SCR reactor 11 by the ammonia spraying device 6 to be mixed with flue gas, and then the flue gas enters the catalyst layer 5 to complete denitration reaction, and the amount of the reducing agent is controlled by the reducing agent flow control valve 8; the flue gas flow control valve 2 controls the flue gas flow in the flue gas bypass, and the temperature sensor 4 monitors the flue gas temperature, so that the temperature of the flue gas entering the SCR reactor 11 is maintained at 340 +/-20 ℃ (the optimum temperature interval of the denitration reaction), and the flue gas after the denitration reaction enters the second-stage lithium bromide unit 7 and is finally discharged from the chimney 12.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (3)
1. A lithium bromide graded arrangement coupling denitration system is characterized by comprising an internal combustion engine (1), a first-stage lithium bromide unit (3), a medium-temperature SCR denitration system, a second-stage lithium bromide unit (7) and a chimney (12); the smoke exhaust system is characterized in that a smoke exhaust outlet of the internal combustion engine (1), a first-stage lithium bromide unit (3), a medium-temperature SCR denitration system, a second-stage lithium bromide unit (7) and a chimney (12) are sequentially communicated, a smoke bypass is arranged on a smoke pipeline of the first-stage lithium bromide unit (3), the smoke bypass is communicated with the smoke exhaust outlet of the internal combustion engine (1) and an inlet of the medium-temperature SCR denitration system, a smoke flow control valve (2) is arranged on the smoke bypass, and an inlet of the medium-temperature SCR denitration system is provided with a temperature sensor (4).
2. The lithium bromide stage-arranged coupled denitration system according to claim 1, wherein the medium-temperature SCR denitration system comprises an SCR reactor (11) and a reducing agent storage tank (10), the SCR reactor (11) is arranged between the first-stage lithium bromide unit (3) and the second-stage lithium bromide unit (7), and the reducing agent storage tank (10) is connected with the SCR reactor (11).
3. The lithium bromide graded-arrangement coupled denitration system according to claim 2, wherein a catalyst layer (5) and an ammonia injection device (6) are arranged in the SCR reactor (11), a reducing agent storage tank (10) and a compressed air pump (9) are both connected with the ammonia injection device (6), the reducing agent storage tank (10) and the compressed air pump (9) are arranged in parallel, and an inlet of the ammonia injection device (6) is provided with a reducing agent flow control valve (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920352269.4U CN210171228U (en) | 2019-03-20 | 2019-03-20 | Lithium bromide is arranged coupling deNOx systems in grades |
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| CN201920352269.4U CN210171228U (en) | 2019-03-20 | 2019-03-20 | Lithium bromide is arranged coupling deNOx systems in grades |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109939565A (en) * | 2019-03-20 | 2019-06-28 | 华电电力科学研究院有限公司 | A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109939565A (en) * | 2019-03-20 | 2019-06-28 | 华电电力科学研究院有限公司 | A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method |
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