CN214106467U - Ammonia gas flow regulating device and denitration system - Google Patents
Ammonia gas flow regulating device and denitration system Download PDFInfo
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- CN214106467U CN214106467U CN202023329897.2U CN202023329897U CN214106467U CN 214106467 U CN214106467 U CN 214106467U CN 202023329897 U CN202023329897 U CN 202023329897U CN 214106467 U CN214106467 U CN 214106467U
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Abstract
The utility model discloses an ammonia flow regulator and deNOx systems, ammonia flow regulator include the trunk line, the trunk line is arranged in between urea hydrolysis reactor and the blender, be provided with the governing valve on the trunk line, still include the small transfer line that sets up with the trunk line is parallelly connected, the both sides of governing valve are arranged respectively in at the both ends of small transfer line, be provided with the stop valve on the small transfer line. The utility model solves the problem that the prior flow adjusting device can not provide accurate ammonia gas supply amount well; this deNOx systems adopts ammonia flow regulator to reach accurate control and supplies ammonia volume, makes the deNOx systems can guarantee to have good denitration efficiency, has also guaranteed that ammonia escape volume can not exceed standard.
Description
Technical Field
The utility model relates to a SCR denitration technology field, concretely relates to ammonia flow control device and deNOx systems.
Background
With the requirement of environmental protection standard becoming higher and higher, the denitration device has become the necessary environmental protection facility of thermal power generating unit, and selective catalytic reduction SCR denitration device uses the most extensively. The SCR denitration device reduces nitrogen oxides NOx into nitrogen and water by taking ammonia gas as a reducing agent under the action of a catalyst, so that the aim of denitration is fulfilled. In the selection of ammonia production technology, both a liquid ammonia method and a urea hydrolysis method can be used as sources for preparing ammonia gas in flue gas denitration. The urea hydrolysis ammonia production method has the advantages of good safety, low energy consumption level, low operation cost and the like by taking steam as a heat source. With the improvement of the national requirements on safe production, the urea hydrolysis ammonia production is required to be adopted as a source of a flue gas denitration reducing agent to avoid potential safety hazards according to the denitration technical route requirements of various large power generation group companies.
After urea hydrolysis reaction, the product gas at the outlet is mainly NH3、CO2And the mist of vapor, the required ammonia quantity of denitration reaction is also different according to the difference of NOx concentration, consequently, need adopt flow control device to adjust the ammonia flow that gets into the SCR reactor, flow control device's purpose is that it can guarantee to have good denitration efficiency, it can not exceed standard also to have guaranteed that ammonia escape volume, however, current flow control device adopts single valve to control, can not the better accurate ammonia supply volume that provides, can not realize guaranteeing to have good denitration efficiency, also can not guarantee that ammonia escape volume can not exceed standard's purpose.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ammonia flow control device solves the problem that the accurate ammonia supply volume that provides that current flow control device can not be better.
Furthermore, the utility model discloses still relate to the deNOx systems including above-mentioned ammonia flow regulator, this deNOx systems adopts ammonia flow regulator to reach accurate control and supplies ammonia volume, makes deNOx systems can guarantee to have good denitration efficiency, has also guaranteed that ammonia escape volume can not exceed standard.
The utility model discloses a following technical scheme realizes:
ammonia flow regulator, including the trunk line, the trunk line is arranged in between urea hydrolysis reactor and the blender, be provided with the governing valve on the trunk line, still include the small transfer line that sets up with the trunk line is parallelly connected, the both sides of governing valve are arranged respectively in at the both ends of small transfer line, be provided with the stop valve on the small transfer line.
Preferably, the ammonia gas flow regulating device adopts a skid-mounted structure.
The utility model is provided with the regulating valve and the stop valve in parallel, when the supply amount of the needed ammonia gas is larger, the regulating valve is mainly adopted to control the flow of the ammonia gas, and the technological requirements can be better met; when supply volume reduces to about 30% that flow capacity reaches the regulating valve opening, can close the regulating valve, adopt the stop valve of bypass to adjust, realize the accurate regulation to the ammonia.
Further, the opening of the regulating valve is set to 30% to 80%.
Further, ball valves are arranged on the two sides of the regulating valve on the main pipeline.
Further, the inlet end of the main pipeline is provided with a ball valve.
Further, a temperature transmitter is arranged on the main pipeline between the ball valve at the inlet end and the regulating valve or the stop valve.
Further, a pressure transmitter and a pressure gauge are arranged on the main pipeline between the ball valve at the inlet end and the regulating valve or the stop valve.
Further, a pneumatic valve is provided on the main conduit between the ball valve at the inlet end and the regulating or stop valve.
Further, a mass flow meter is provided on the main conduit between the ball valve at the inlet end and the regulating valve or stop valve.
The denitration system comprises the ammonia gas flow regulating device, and further comprises a urea hydrolysis reactor, a mixer, a fan, an ammonia spraying device and an SCR reactor;
in the denitration system, product gas generated at the outlet of the urea hydrolyzer is conveyed to a mixer through a pneumatic ball valve, a flowmeter and an adjusting valve, is mixed with air and then enters a subsequent denitration system.
The ammonia flow regulating device is arranged between mixers of the urea hydrolysis reactor, the fan is communicated with the mixers through a pipeline, and the rear end of each mixer is sequentially provided with the ammonia spraying device and the SCR reactor.
Further, the ammonia injection device adopts a grid structure.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model is provided with the regulating valve and the stop valve in parallel, when the supply amount of the needed ammonia gas is larger, the regulating valve is mainly adopted to control the flow of the ammonia gas, and the technological requirements can be better met; when supply volume reduces to about 30% that flow capacity reaches the regulating valve opening, can close the regulating valve, adopt the stop valve of bypass to adjust, realize the accurate regulation to the ammonia.
2. The ammonia gas flow regulating device comprises a transmitter and a metering device for measuring the pressure, the temperature and the flow of ammonia gas; the flow regulating module transmits a signal of the required ammonia gas supply amount through the denitration system to regulate the opening degree of a valve in the module, so that the ammonia gas required by the denitration system is accurately supplied.
3. The utility model discloses the product gas that deNOx systems exported from the urea hydrolyser, through ammonia flow control device, the ammonia supply volume that can accurate control be used for the SCR reactor makes it reach good efficiency of selling of taking off, and the volume that ammonia escaped simultaneously is the reduction also relatively.
4. The utility model discloses a sled dress structure, compact structure, installation and maintenance are simple and convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a denitration system;
fig. 2 is a schematic structural diagram of the ammonia gas flow rate adjusting device.
Reference numbers and corresponding part names in the drawings:
1-ball valve, 2-temperature transmitter, 3-pressure transmitter, 4-pressure gauge, 5-pneumatic valve, 6-mass flowmeter, 7-regulating valve, 8-stop valve, 9-urea hydrolysis reactor, 10-mixer, 11-blower, 12-ammonia spraying device and 13-SCR reactor.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1:
as shown in fig. 1 and 2, the ammonia gas flow regulating device comprises a main pipeline, a regulating valve 7 arranged on the main pipeline, and a branch pipeline connected in parallel with the main pipeline, wherein two ends of the branch pipeline are respectively arranged on two sides of the regulating valve 7, and a stop valve 8 is arranged on the branch pipeline; in order to maintain good adjusting performance and precision of the adjusting valve 7, the opening degree of the adjusting valve 7 is set to be 30% -80%; the ball valves 1 are arranged on the two sides of the regulating valve 7 on the main pipeline; the ball valves 1 at the front and rear of the regulating valve 7 are provided with means for preventing the backflow of ammonia gas injected into the pipeline.
The principle of realizing accurate regulation ammonia flow of this embodiment is as follows:
the ammonia amount required by the denitration reaction is different according to different NOx concentrations, and the ammonia flow regulating device improves the control precision of the ammonia flow by additionally arranging the regulating valve 7. In order to maintain good regulation performance and precision of the regulating valve 7, the opening degree of the regulating valve 7 is in a range of about 30-80%. The required amount of ammonia depends on NOx and load in the boiler, and when the required ammonia supply amount is large, the flow rate is mainly controlled by the regulating valve 7, so that the process requirement can be well met. When the supply amount is reduced to a flow capacity of about 30% of the opening of the control valve 7, the control valve is closed and the bypass stop valve 8 is used for control.
Example 2:
as shown in fig. 1 and 2, the present embodiment is based on embodiment 1, and the inlet end of the main pipeline is provided with a ball valve 1; be provided with temperature transmitter 2, pressure transmitter 3, pressure gauge 4, pneumatic valve 5 and mass flow meter 6 between ball valve 1 and the governing valve 7 of inlet end department on the trunk line, temperature transmitter 2, pressure transmitter 3, pressure gauge 4, pneumatic valve 5 and mass flow meter 6 also place in between ball valve 1 and the stop valve 8 of inlet end department.
In this embodiment, the ball valve 1 is disposed at the inlet end of the main pipeline, so that the pipeline can be safely cut off to achieve a good protection effect mainly when the reactor stops operating or is interlocked with a protection action.
Example 3:
as shown in fig. 1 and 2, the denitration system is characterized by comprising the ammonia gas flow rate adjusting device described in embodiment 1 or embodiment 2, and further comprising a urea hydrolysis reactor 9, a mixer 10, a fan 11, an ammonia injection device 12, and an SCR reactor 13;
the ammonia gas flow regulating device is arranged between the urea hydrolysis reactor 9 and the mixer 10, the fan 11 is communicated with the mixer 10 through a pipeline, and the rear end of the mixer 10 is sequentially provided with an ammonia spraying device 12 and an SCR reactor 13; the ammonia injection device 12 adopts a grid structure.
The working principle of the embodiment is as follows:
the product gas (ammonia, carbon dioxide and water vapor) generated in the urea hydrolysis reactor 9 is adjusted in flow and pressure by an ammonia flow adjusting device, then enters a mixer 10 to be fully mixed with air, enters a flue by an ammonia injection device 12 to be mixed with flue gas, then enters an SCR reactor 13 to react, and the ammonia in the SCR reactor 13 and nitrogen oxide NOx in the flue gas are subjected to catalytic reaction under the action of a catalyst to generate N2And H2O。
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. Ammonia flow regulator, including the trunk line, the trunk line is arranged in between urea hydrolysis reactor (9) and blender (10), its characterized in that, be provided with governing valve (7) on the trunk line, still include the small transfer line who sets up with the trunk line is parallelly connected, the both sides of governing valve (7) are arranged respectively in at the both ends of small transfer line, be provided with stop valve (8) on the small transfer line.
2. The ammonia gas flow regulating device according to claim 1, characterized in that the opening degree of the regulating valve (7) is set to 30-80%.
3. Ammonia gas flow regulating device according to claim 1, characterized in that the main conduit is provided with ball valves (1) on both sides of the regulating valve (7).
4. Ammonia gas flow regulating device according to claim 1, characterized in that the inlet end on the main pipe is provided with a ball valve (1).
5. Ammonia flow regulating device according to claim 4, characterized in that a temperature transmitter (2) is arranged on the main pipe between the ball valve (1) and the regulating valve (7) or the stop valve (8) at the inlet end.
6. Ammonia flow regulating device according to claim 4, characterized in that a pressure transmitter (3) and a pressure gauge (4) are provided on the main pipe between the ball valve (1) and the regulating valve (7) or the stop valve (8) at the inlet end.
7. Ammonia flow regulating device according to claim 4, characterized in that a pneumatic valve (5) is arranged on the main conduit between the ball valve (1) at the inlet end and the regulating valve (7) or the stop valve (8).
8. Ammonia flow regulating device according to claim 4, characterized in that a mass flow meter (6) is arranged on the main conduit between the ball valve (1) at the inlet end and the regulating valve (7) or the stop valve (8).
9. The denitration system comprising the ammonia gas flow regulating device of any one of claims 1 to 8, further comprising a urea hydrolysis reactor (9), a mixer (10), a fan (11), an ammonia injection device (12) and an SCR reactor (13);
the ammonia flow regulating device is arranged between the urea hydrolysis reactor (9) and the mixer (10), the fan (11) is communicated with the mixer (10) through a pipeline, and the rear end of the mixer (10) is sequentially provided with the ammonia spraying device (12) and the SCR reactor (13).
10. The denitration system according to claim 9, wherein the ammonia injection device (12) has a grid structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202023329897.2U CN214106467U (en) | 2020-12-30 | 2020-12-30 | Ammonia gas flow regulating device and denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023329897.2U CN214106467U (en) | 2020-12-30 | 2020-12-30 | Ammonia gas flow regulating device and denitration system |
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| CN214106467U true CN214106467U (en) | 2021-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
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