CN211274231U - System for solving problem of removing NOx in cold start of internal combustion engine - Google Patents
System for solving problem of removing NOx in cold start of internal combustion engine Download PDFInfo
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- CN211274231U CN211274231U CN201921423710.XU CN201921423710U CN211274231U CN 211274231 U CN211274231 U CN 211274231U CN 201921423710 U CN201921423710 U CN 201921423710U CN 211274231 U CN211274231 U CN 211274231U
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- combustion engine
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Abstract
The utility model discloses a system for solving the problem of removing NOx in cold start of an internal combustion engine, which comprises the internal combustion engine, a lithium bromide unit, a heat storage device, an air pump, a reducing agent storage tank, a chimney and an SCR denitration system; an energy storage system is arranged between the internal combustion engine and the lithium bromide unit, part of exhaust smoke energy is stored in the normal operation process, and before the internal combustion engine is cold started, compressed air firstly passes through the energy storage device to increase the temperature of the compressed air and preheat the SCR denitration system. When the surface temperature of the catalyst meets the requirement of normal denitration, the internal combustion engine can be started normally, and meanwhile, the reducing agent injection system is started to remove NOx. The utility model has reasonable system structure and convenient arrangement and installation; the denitration problem of the internal combustion engine under all working conditions can be solved, and the influence on the lithium bromide unit is small.
Description
Technical Field
The utility model relates to an internal-combustion engine can source station flue gas denitration field especially relates to the flue gas denitration technique that is applicable to in the gas internal-combustion engine cold start process.
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, and NO in the exhaust tail gas is causedxThe mass concentration of the discharged matter is higher, and is generally 200mg/m3Above, the requirements for discharging pollutants in the atmosphere are far exceeded. In the form of increasingly serious atmospheric pollution, the quality concentration reduction of the emission of the atmospheric pollutants is broken at the very beginning, and NO is not discharged at allxEmissions are an important indicator of atmospheric pollutants emissions, and therefore, the reduction of NO in internal combustion enginesxEmission mass concentration will also be an important aspect of internal combustion engine dominated cogeneration systems.
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 catalyst3As a reducing agent, selectively reacts with NO in the flue gas at high temperaturexReacting to generate nontoxic and pollution-free nitrogen and water. The temperature range of the catalyst is 300-550 ℃ (medium temperature and high temperature).
With the increasing strictness of the emission standard of the atmospheric pollutants, the NO of the internal combustion engine is reducedxThe emission mass concentration will be internal combustionThe existing technology can only achieve the emission of NOx reaching the standard in the working process of a gas internal combustion engine and cannot meet the emission reaching the standard in the cold starting process.
Therefore, the utility model provides a solve cold start in-process gas internal-combustion engine NOx emission control's system can solve the full operating mode NOx emission problem including cold starting process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a system of solving internal-combustion engine cold start NOx desorption problem, solve the full operating mode NOx emission problem including cold starting process.
The utility model provides a technical scheme that above-mentioned problem adopted is: a system for solving the problem of removing NOx in cold start of an internal combustion engine is characterized by comprising the internal combustion engine, a lithium bromide unit, a heat storage device, an air pump, a reducing agent storage tank, a chimney and an SCR denitration system; the internal combustion engine, the SCR denitration system, the lithium bromide unit and the chimney are sequentially connected, the heat storage device is arranged between a smoke exhaust outlet of the internal combustion engine and a smoke inlet of the SCR denitration system, the SCR denitration system comprises a nozzle, a catalyst layer and a temperature sensing device, and the temperature sensing device is arranged on the surface of the catalyst layer; the nozzle is connected with the reducing agent storage tank through a pipeline, and a reducing agent flow control valve is mounted on the pipeline; the air inlet of the heat storage device is provided with a flow control valve, and the heat storage device is externally connected with an air pump.
Furthermore, the inlet of the heat storage device is provided with a flow control valve for controlling the heat exchange amount of the heat storage device.
Furthermore, a temperature sensing device is arranged in the SCR denitration system and used for monitoring the surface temperature of the catalyst layer.
Further, the catalyst layer comprises a thin-wall catalyst with high specific surface area.
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 can solve full operating mode internal-combustion engine denitration problem and not influence lithium bromide unit greatly.
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 nozzle 2, a catalyst layer 3, a lithium bromide unit 4, a flow control valve 5, a heat storage device 6, an air pump 7, a reducing agent flow control valve 8, a reducing agent storage tank 9, a chimney 10, a temperature sensing device 11 and an SCR denitration system 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.
Referring to fig. 1, the system for solving the problem of removing NOx during cold start of the internal combustion engine in the embodiment includes an internal combustion engine 1, a nozzle 2, a catalyst layer 3, a lithium bromide unit 4, a flow control valve 5, a heat storage device 6, an air pump 7, a reducing agent flow control valve 8, a reducing agent storage tank 9, a chimney 10, a temperature sensing device 11, and an SCR denitration system 12.
The internal combustion engine 1, the SCR denitration system 12, the lithium bromide unit 4 and the chimney 10 are sequentially connected, the heat storage device 6 is arranged between the smoke exhaust outlet of the internal combustion engine 1 and the smoke inlet of the SCR denitration system 12, the SCR denitration system 12 comprises a nozzle 2, a catalyst layer 3 and a temperature sensing device 11, and the temperature sensing device 11 is arranged on the surface of the catalyst layer 3; the nozzle 2 is connected with a reducing agent storage tank 9 through a pipeline, and a reducing agent flow control valve 8 is arranged on the pipeline; the air inlet of the heat storage device 6 is provided with a flow control valve 5, and the heat storage device 6 is externally connected with an air pump 7.
The inlet of the thermal storage device 6 is provided with a flow control valve 5 for controlling the amount of heat exchange of the thermal storage device 6. A temperature sensing device 11 is arranged in the SCR denitration system 12, and is used for monitoring the surface temperature of the catalyst layer 3. The catalyst layer 3 contains a thin-walled catalyst having a high specific surface area.
The working method comprises the following steps: high-temperature flue gas is discharged from the internal combustion engine 1, a part of the flue gas enters a heat storage device 6 for heat exchange, the heat exchange amount is controlled by adjusting a flow control valve 5, the flue gas after heat exchange is mixed with the other part of the flue gas discharged from the internal combustion engine 1 and then enters an SCR denitration system 12 to complete denitration reaction, then the flue gas enters a lithium bromide unit 4 for producing cold or heat, and finally the flue gas is discharged into the atmosphere through a chimney 10;
when the internal combustion engine 1 is started in a cold state, outdoor air enters the heat storage device 6 through the air pump 7 to exchange heat, the air is heated and then enters the SCR denitration system 12 to heat the catalyst, if the temperature displayed by the temperature sensing device 11 reaches the temperature in the normal working range of the catalyst, the internal combustion engine 1 is started, meanwhile, the nozzle 2 sprays the reducing agent to perform denitration reaction, at the moment, the operation of the air pump 7 is stopped, the flow control valve 5 is started, and the heat storage device 6 is stored with energy.
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 (2)
1. A system for solving the problem of removing NOx in cold start of an internal combustion engine is characterized by comprising the internal combustion engine (1), a lithium bromide unit (4), a heat storage device (6), an air pump (7), a reducing agent storage tank (9), a chimney (10) and an SCR denitration system (12); the internal combustion engine (1), the SCR denitration system (12), the lithium bromide unit (4) and the chimney (10) are sequentially connected, the heat storage device (6) is arranged between a smoke exhaust outlet of the internal combustion engine (1) and a smoke inlet of the SCR denitration system (12), the SCR denitration system (12) comprises a nozzle (2), a catalyst layer (3) and a temperature sensing device (11), and the temperature sensing device (11) is arranged on the surface of the catalyst layer (3); the nozzle (2) is connected with a reducing agent storage tank (9) through a pipeline, and a reducing agent flow control valve (8) is installed on the pipeline; the air inlet of the heat storage device (6) is provided with a flow control valve (5), and the heat storage device (6) is externally connected with an air pump (7).
2. A system for solving the problem of cold start NOx removal from an internal combustion engine according to claim 1, characterized in that the catalyst layer (3) comprises a thin-walled catalyst with a high specific surface area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921423710.XU CN211274231U (en) | 2019-08-29 | 2019-08-29 | System for solving problem of removing NOx in cold start of internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921423710.XU CN211274231U (en) | 2019-08-29 | 2019-08-29 | System for solving problem of removing NOx in cold start of internal combustion engine |
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| CN211274231U true CN211274231U (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548396A (en) * | 2019-08-29 | 2019-12-10 | 华电电力科学研究院有限公司 | system for solving problem of removing NO x in cold start of internal combustion engine and working method thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548396A (en) * | 2019-08-29 | 2019-12-10 | 华电电力科学研究院有限公司 | system for solving problem of removing NO x in cold start of internal combustion engine and working method thereof |
| CN110548396B (en) * | 2019-08-29 | 2024-05-28 | 华电电力科学研究院有限公司 | Solving cold start NO of internal combustion enginexSystem for removing problems and working method thereof |
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