CN105675499B - Device for determining reverse reaction crystallization of SCR solid reducing agent - Google Patents
Device for determining reverse reaction crystallization of SCR solid reducing agent Download PDFInfo
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- CN105675499B CN105675499B CN201610098277.1A CN201610098277A CN105675499B CN 105675499 B CN105675499 B CN 105675499B CN 201610098277 A CN201610098277 A CN 201610098277A CN 105675499 B CN105675499 B CN 105675499B
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Abstract
The invention discloses a device for measuring the reverse reaction crystallization of an SCR solid reducing agent, which comprises a platform controller, a pressure regulating valve, a laser generator, a photoresistor module, a large circulation heating water tank, a small circulation heating water tank, a large circulation water pump, a small circulation water pump, an electric control nozzle, a large circulation temperature sensor, a small circulation temperature sensor, a pressure sensor, a waterway quartz glass tube, a gas circuit quartz glass tube, a pressure regulating valve and a computer, wherein one side of the pressure regulating valve is provided with a pre-valve mixed gas input pipeline and the other side of the pressure regulating valve is provided with a post-valve mixed gas pipeline, the pre-valve mixed gas input pipeline and the post-valve mixed gas pipeline are both communicated with the pressure regulating valve, the top of the pressure regulating valve is fixedly provided with a waterway outlet E, and the bottom of the pressure regulating valve is fixedly provided with a waterway inlet D.
Description
Technical Field
The invention particularly relates to a device for measuring the reverse reaction crystallization of an SCR solid-state reducing agent, which is used for measuring the temperature corresponding to crystallization of mixed gas generated by the solid-state SCR reducing agent under different pressures.
Background
The continuous aggravation of environmental pollution and the improvement of environmental awareness worldwide promote the continuous upgrading of automobile emission regulations. Urea SCR technology is widely used worldwide as an effective means of reducing NOx emissions from diesel vehicles. However, when the exhaust temperature is lower than 250 ℃, urea cannot be completely decomposed, so that a reducing agent-NH 3 required for reducing NOx cannot be obtained, byproducts which cause the failure of the SCR catalyst are also produced, and in order to further improve the conversion efficiency of NOx at low exhaust temperatures, ammonium salts such as ammonium carbamate, ammonium carbonate, ammonium bicarbonate and the like are proposed as raw materials for providing NH3, because the ammonium salts are low in price and low in decomposition temperature, the NH3 can be rapidly decomposed within the range of the engine cycle water temperature without being limited by the exhaust temperature, thereby improving the conversion efficiency of NOx and reducing the emission of NOx.
The use of ammonium salts as a source of reducing agents requires the definition of the properties of ammonium salts, the decomposition process, the decomposition temperature, etc. The decomposition of ammonium salts such as ammonium carbamate and ammonium carbonate is a reversible reaction, and the thermal decomposition rate of the ammonium salts increases with the increase of temperature. The generated gas can be polymerized again below a certain temperature to generate solid crystalline powder, and if the powder is generated at a pressure transmitter, a pressure regulating valve and a nozzle, the NH3 injection amount is difficult to control accurately, so that the conversion efficiency of NOx is affected. To avoid the generation of reverse reaction crystallization powder, the crystallization temperature of the mixed gas generated by decomposing ammonium salt must be determined, and for this purpose, we propose a device for measuring the SCR solid-state reducing agent reverse reaction crystallization.
Disclosure of Invention
The invention aims to overcome the existing defects, and provides the device for determining the reverse reaction crystallization of the SCR solid reducing agent, which can determine the temperature corresponding to the crystallization of the mixed gas under different gas pipeline pressures, thereby providing a theoretical basis for the heat preservation design of a solid ammonium salt SCR system pipeline, improving the energy utilization efficiency, reducing the NOx emission, protecting the atmospheric environment and effectively solving the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a reverse reaction crystallization device for determining SCR solid reducing agent, which comprises a platform controller, a pressure regulating valve, a laser generator, a photoresistor module, a large circulation heating water tank, a small circulation heating water tank, a large circulation water pump, a small circulation water pump, an electric control nozzle, a large circulation temperature sensor, a small circulation temperature sensor, a pressure sensor, a waterway quartz glass tube, a gas circuit quartz glass tube, a pressure regulating valve and a computer, wherein one side of the pressure regulating valve is provided with a valve front mixed gas input pipeline and the other side of the pressure regulating valve is provided with a valve rear mixed gas pipeline, the valve front mixed gas input pipeline and the valve rear mixed gas pipeline are both communicated with the pressure regulating valve, the top of the pressure regulating valve is fixedly provided with a waterway outlet E, the bottom of the pressure regulating valve is fixedly provided with a waterway inlet D, one end of the valve front mixed gas input pipeline is provided with an inlet A, the exterior of the valve front mixed gas input pipeline is provided with a valve front heat preservation pipeline, an inlet B and an outlet C arranged at the other end of the valve front heat preservation pipeline are arranged at one end of the valve front heat preservation pipeline, an electric control nozzle is fixedly communicated with one end of the valve rear gas mixture pipeline, a valve rear small circulation heat preservation pipeline, a nozzle front large circulation heat preservation pipeline, an inlet H and an outlet I are arranged between the valve rear small circulation heat preservation pipeline and the nozzle front large circulation heat preservation pipeline, an inlet J and an outlet K positioned at the other end of one side of the electric control nozzle are arranged at one end of the nozzle front large circulation heat preservation pipeline, an inlet F and an outlet G are arranged at one end of the valve rear small circulation heat preservation pipeline, the outlet G is mutually isolated from the inlet H and the outlet I and the inlet J, a pressure sensor is arranged between the outlet G and the inlet H, a small circulation temperature sensor is fixedly arranged at one side of the outlet G, the utility model discloses a high-temperature water heater, including valve back hybrid gas pipeline, gas circuit quartz glass tube, water route quartz glass tube, laser generator, water route quartz glass tube, little circulation heating water tank and little circulation water pump, gas circuit quartz glass tube and the water route quartz glass tube of setting outside gas circuit quartz glass tube are all located between entry F and the export G to gas circuit quartz glass tube internally mounted, water circuit quartz glass tube top is equipped with laser generator and water route quartz glass tube bottom and is equipped with the photoresistor module, little circulation heating water tank and little circulation water pump are connected, little circulation heating water tank bottom is equipped with entry L, little circulation water pump one side is equipped with export M, the big circulation heating water tank is connected with big circulation water pump, big circulation heating water tank bottom is equipped with entry N, big circulation water pump one side is equipped with export P.
As a preferable technical scheme of the invention, the computer, the large-cycle temperature sensor, the small-cycle temperature sensor, the pressure sensor and the photoresistor module are respectively electrically connected with the platform controller, and the laser generator is electrically connected with the photoresistor module.
As a preferable technical scheme of the invention, the electric control nozzle receives a control signal from the platform controller to control the injection of the mixed gas.
As a preferable technical scheme of the invention, the heating function of the large circulation heating water tank and the on-off of the large circulation water pump are controlled by the platform controller.
As a preferable technical scheme of the invention, the heating function of the small circulating heating water tank and the on-off of the small circulating water pump are controlled by the platform controller.
As a preferable technical scheme of the invention, the inner diameter of the heat preservation pipeline before the valve is larger than the outer diameter of the mixed gas input pipeline before the valve, and the inner diameters of the small circulation heat preservation pipeline after the valve and the large circulation heat preservation pipeline before the nozzle are both larger than the outer diameter of the mixed gas pipeline after the valve.
As a preferred embodiment of the present invention, the outlet M is connected to the inlet F, the outlet G is connected to the inlet H, and the outlet I is connected to the inlet L.
As a preferred embodiment of the present invention, the outlet E is connected to the inlet J, the outlet K is connected to the inlet J, and the outlet K is connected to the inlet N.
The beneficial effects achieved by the invention are as follows: a device for measuring the reverse reaction crystallization of SCR solid reducer features that the laser generated by laser generator passes through quartz glass tube to photosensitive resistor module. After the pressure of the mixed gas is regulated by the pressure regulating valve, the temperature of the heat preservation pipeline is reduced, when the temperature is reduced to a certain value, the mixed gas can form crystalline powder on the inner wall of the gas circuit quartz glass tube, meanwhile, the light intensity received by the photoresistor can change, and the measured pressure of the mixed gas and the temperature of the heat preservation pipeline are in a corresponding relation, namely the temperature corresponding to crystallization of the mixed gas, so that theoretical basis is provided for heat preservation design of a solid ammonium salt SCR system pipeline, energy utilization efficiency is improved, NOx emission is reduced, and the atmosphere environment is protected.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
In the drawings:
FIG. 1 is a schematic diagram of an overall structure of a device for determining the reverse reaction crystallization of an SCR solid-state reducing agent according to an embodiment of the invention;
reference numerals in the drawings: 1. a mixed gas input pipeline in front of the valve; 2. a valve front heat preservation pipeline; 3. a pressure regulating valve; 4. a small circulation heat preservation pipeline behind the valve; 5. a waterway quartz glass tube; 6. a valve post-mix gas line; 7. a gas circuit quartz glass tube; 8. a laser generator; 9. a photoresistor module; 10. a large circulation heat preservation pipeline in front of the nozzle; 11. an electric control nozzle; 12. a pressure sensor; 13. a small-cycle temperature sensor; 14. a large cycle temperature sensor; 15. a platform controller; 16. a small circulation heating water tank; 17. a small circulating water pump; 18. a large circulation heating water tank; 19. a large circulating water pump; 20. and a computer.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Examples: referring to fig. 1, a mixed gas generated by an SCR solid reducing agent enters a pre-valve mixed gas input pipeline 1 from an inlet a, the pre-valve mixed gas input pipeline 1 is communicated with a pressure regulating valve 3, the mixed gas enters a post-valve mixed gas pipeline 6 after pressure regulation by the pressure regulating valve 3, and an electric control nozzle 11 receives a control signal from a platform controller 15 to control injection of the mixed gas.
A large circulation heating water tank 18 and a large circulation water pump 19, which provide hot water for maintaining the pipeline temperature for the large circulation. The heating function of the large circulation heating water tank 18 and the on-off of the large circulation water pump 19 are controlled by the platform controller 15. The hot water heated by the large circulation heating water tank 18 flows out from an outlet M of the large circulation water pump 19, flows into the valve front heat preservation pipeline 2 through an inlet B, flows out from an outlet C of the valve front heat preservation pipeline 2, flows into a waterway inlet D of the pressure regulating valve 3, flows out from a waterway outlet E of the pressure regulating valve 3, flows into an inlet J of the nozzle front large circulation heat preservation pipeline 10, flows out from an outlet K of the nozzle front large circulation heat preservation pipeline 10, and flows back to the large circulation heating water tank 18 from an inlet N. Thereby forming a large circulation waterway. The circulation sequence of the large circulation waterway is as follows: outlet P-inlet B-outlet C-inlet D-outlet E-inlet J-outlet K-inlet N-outlet P.
A small circulation heating water tank 16 and a small circulation water pump 17, which provide hot water for maintaining the pipeline temperature for the small circulation. The heating function of the small circulation heating water tank 16 and the on-off of the small circulation water pump 17 are controlled by the platform controller 15. The hot water heated by the small circulation heating water tank 16 flows out from the outlet M of the small circulation water pump 17, flows into the valve rear small circulation heat preservation pipeline 4 through the inlet F, and flows out from the outlet G. The small circulating water flows out from the outlet G, enters the inlet H and flows out from the outlet I. The waterway between the inlet F and the outlet I is that the outlet G and the inlet H of the valve rear small circulation heat preservation pipeline 4 are mutually isolated, but the valve rear mixed gas pipeline 6 can pass through. A pressure sensor 12 is installed between the outlet G and the inlet H for monitoring the gas pressure in the post-valve gas mixture line 6, and the signal of the pressure sensor 12 is transmitted to a platform controller 15. The signal of the pressure sensor 12 is transmitted to the platform controller 15 for controlling whether the small circulation heating water tank 16 heats the circulation water. The circulation sequence of the small circulation waterway is as follows: outlet M-inlet F-outlet G-inlet H-outlet I-inlet L-outlet M.
The photoresistor module 9 receives the laser light from the laser generator 8. The photoresistor module 9 can convert the light intensity of the laser into a voltage signal and transmit the voltage signal to the platform controller 15.
The working process of the experimental platform comprises the following steps: firstly, a certain amount of purified water is added into a small circulation heating water tank 16 and a large circulation heating water tank 18, a platform controller 15 sends signals to the small circulation heating water tank 16 and the large circulation heating water tank 18 to start heating, a small circulation water pump 17 and a large circulation water pump 19 are started, and the small circulation water pump and the large circulation water pump are started simultaneously. The small circulation temperature sensor 13 and the large circulation temperature sensor 14 transmit the small circulation water temperature and the large circulation water temperature, respectively, to the platform controller 15.
After the small and large cycle temperatures reached the temperature was maintained stable. And (3) introducing gas generated by the SCR solid ammonium salt into a gas path inlet A of the experiment platform, regulating the gas pressure to be reduced to a certain value by using a pressure regulating valve 3, and monitoring the gas pressure after the pressure regulating valve 3 by a pressure sensor 12 and transmitting a pressure signal to a platform controller 15. The platform controller 15 sends a signal to the electronically controlled nozzle 11 to maintain a certain injection pulse width and again adjusts the pressure regulating valve 3 so that the post-valve gas pressure reaches the desired experimental pressure value.
After the pressure adjustment is completed, the laser generator 8 and the photoresistor module 9 are started, the photoresistor module 9 transmits the voltage signals of the light intensity to the platform controller 15 in real time, and the platform controller 15 transmits the voltage signals of the temperature, the pressure and the light intensity to the computer 20 in real time, and the computer 20 displays and records the signals in real time. The temperature of the large circulation waterway is maintained, the heating function of the small circulation heating water tank 16 is stopped, and the small circulation water pump 17 continues to work. When the temperature of the small circulation waterway is continuously reduced and reaches a certain temperature, the mixed gas can form crystalline powder on the inner wall of the gas circuit quartz glass tube 7, meanwhile, the light intensity received by the photoresistor module 9 can be weakened, and the corresponding voltage signal can be changed. The measured small circulating water temperature is the temperature corresponding to the crystallization of the mixed gas under a certain pressure, namely, the mixed gas can generate crystallization powder as long as the temperature is equal to or lower than the temperature corresponding to the change of the light intensity under the gas pressure.
And repeating the steps to obtain the crystallization temperatures corresponding to different mixed gas pressures.
The invention relates to a device for measuring the reverse reaction crystallization of an SCR solid reducing agent, which is characterized in that after the pressure of a mixed gas is regulated by a pressure regulating valve 3, the temperature of a heat preservation pipeline is reduced, when the temperature is reduced to a certain value, the mixed gas can form crystalline powder on the inner wall of a gas circuit quartz glass tube 7, and meanwhile, the intensity of light received by a photoresistor can be changed. The measured pressure of the mixed gas and the temperature of the heat preservation pipeline are in a corresponding relation, namely the temperature corresponding to the crystallization of the mixed gas. The invention can measure the crystallization temperature corresponding to different mixed gas pressures and provides theoretical support for the design and stable operation of the solid SCR system.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a survey SCR solid-state reductant reverse reaction crystallization device, including platform controller (15), air-vent valve (3), laser generator (8), photoresistor module (9), big circulation heating water tank (18), little circulation heating water tank (16), big circulating water pump (19), little circulating water pump (17), automatically controlled nozzle (11), big circulation temperature sensor (14), little circulation temperature sensor (13), pressure sensor (12), water route quartz glass pipe (5), gas circuit quartz glass pipe (7), air-vent valve (3) and computer (20), characterized in that, air-vent valve (3) one side is equipped with mixed gas input pipeline before the valve (1) and air-vent valve (3) opposite side is equipped with mixed gas pipeline after the valve (6), mixed gas input pipeline before the valve (1) and air-vent valve (6) all communicate with air-vent valve (3), air-vent valve (3) top is fixed to be equipped with water route export E and air-vent valve (3) bottom is fixed to be equipped with water route entry D, mixed gas input pipeline before the valve (1) one end is equipped with entry A, mixed gas input pipeline before the valve (1) outside is equipped with valve before the valve (2) and heat preservation valve before the valve (2) keeps warm and heat preservation pipeline before the other end (2) keeps warm and holds the valve after the valve (2), an electric control nozzle (11) is fixedly communicated with one end of the mixed gas pipeline (6) behind the valve, a small circulation heat preservation pipeline (4) behind the valve and a large circulation heat preservation pipeline (10) in front of the nozzle and an inlet H and an outlet I arranged between the small circulation heat preservation pipeline (4) behind the valve and the large circulation heat preservation pipeline (10) in front of the nozzle are arranged outside the mixed gas pipeline (6) behind the valve, one end of the large circulation heat preservation pipeline (10) in front of the nozzle is provided with an inlet J and an outlet K positioned at the other end of one side of the electric control nozzle (11), one end of the small circulation heat preservation pipeline (4) behind the valve is provided with an inlet F and the other end is provided with an outlet G, the outlet G is mutually isolated with the inlet H and the outlet I and the inlet J, a pressure sensor (12) is arranged between the outlet G and the inlet H, one side of the outlet G is fixedly provided with a small circulation temperature sensor (13), a gas circuit quartz glass tube (7) and a waterway glass tube (5) arranged outside the large circulation heat preservation pipeline (7) in front of the valve, the quartz glass tube (7) and the quartz glass tube (7) are internally mounted, one end of the small circulation glass tube (7) and the waterway glass tube (5) are respectively arranged at the outer side of the quartz glass tube (7), the small circulation glass tube (17) and the small circulation glass tube (16) are connected with a small waterway (16) and a small waterway pump (17), the utility model discloses a laser generator, including little circulation heating water tank (16), little circulation heating water tank (17) one side is equipped with export M, big circulation heating water tank (18) and big circulation water pump (19) are connected, big circulation heating water tank (18) bottom is equipped with entry N, big circulation water pump (19) one side is equipped with export P, computer (20), big circulation temperature sensor (14), little circulation temperature sensor (13), pressure sensor (12) and photo resistance module (9) respectively with platform controller (15) electricity federation, laser generator (8) and photo resistance module (9) electricity federation, automatically controlled nozzle (11) accept the control signal from platform controller (15), control mixture's injection.
2. The device for detecting the reverse reaction crystallization of the SCR solid reducing agent according to claim 1, wherein the heating function of the large circulation heating water tank (18) and the on-off of the large circulation water pump (19) are controlled by the platform controller (15).
3. The device for measuring the reverse reaction crystallization of the SCR solid reducing agent according to claim 1, wherein the heating function of the small circulation heating water tank (16) and the on-off of the small circulation water pump (17) are controlled by the platform controller (15).
4. The device for determining the reverse reaction crystallization of the SCR solid reducing agent according to claim 1, wherein the inner diameter of the pre-valve heat preservation pipeline (2) is larger than the outer diameter of the pre-valve mixed gas input pipeline (1), and the inner diameters of the post-valve small circulation heat preservation pipeline (4) and the pre-nozzle large circulation heat preservation pipeline (10) are both larger than the outer diameter of the post-valve mixed gas pipeline (6).
5. The apparatus for detecting the reverse reaction crystallization of a solid reducing agent of SCR according to claim 1, wherein the outlet M is connected to the inlet F, the outlet G is connected to the inlet H, and the outlet I is connected to the inlet L.
6. The device for detecting the reverse reaction crystallization of the SCR solid-state reducing agent according to claim 1, wherein the outlet P is connected with the inlet B, the outlet C is connected with the inlet D, the outlet E is connected with the inlet J, the outlet K is connected with the inlet J, and the outlet K is connected with the inlet N.
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