CN211358348U - Flow and pressure control device for tail gas denitration - Google Patents
Flow and pressure control device for tail gas denitration Download PDFInfo
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- CN211358348U CN211358348U CN201922301961.7U CN201922301961U CN211358348U CN 211358348 U CN211358348 U CN 211358348U CN 201922301961 U CN201922301961 U CN 201922301961U CN 211358348 U CN211358348 U CN 211358348U
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Abstract
The utility model belongs to the technical field of SNCR SCR denitration, especially, relate to a flow, pressure control device of tail gas denitration, its structure is: the reducing agent delivery unit comprises a first valve, a filter, a centrifugal pump, a check valve and a second valve which are sequentially connected through pipelines, the second valve is connected with the metering and mixing system through a pump outlet pipeline, two ends of the return pipeline are respectively connected with an inlet of the reducing agent storage tank and the pump outlet pipeline, the pressure gauge is arranged on the pump outlet pipeline between the return pipeline and the second valve, the manual valve and the back pressure valve are both arranged on the return pipeline, and the back pressure valve is arranged close to the inlet of the reducing agent storage tank; the pipe diameter of the backflow pipeline is consistent with that of the outlet of the centrifugal pump. The utility model discloses can overcome the not enough that flow pulsation and noise that current method exists are big for whole controlling means work is more stable, compact structure moreover, easy maintenance, the cost is low.
Description
Technical Field
The utility model belongs to the technical field of SNCR SCR denitration, especially, relate to a flow, pressure control device of tail gas denitration.
Background
This information disclosed in the background of the invention is only for the purpose of increasing an understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
The problem of removing nitrogen oxides from boiler combustion exhaust has been of great concern. Currently, the mainstream processes are divided into SCR and SNCR. SNCR is a catalyst-free denitration method, which is translated into a "selective non-catalytic reduction reaction". As no catalyst is needed, in order to obtain stronger chemical reaction activity, the SNCR technology needs to selectively reduce NOx in the flue gas by using ammonia or urea and other amino reducing agents at higher furnace temperature (900-1150 ℃). SCR is a method of denitration after a furnace, and the commercial operation is completed in the late 60-70 s of the 20 th century by using a reducing agent (NH)3Urea) reacts selectively with NOx to form nitrogen and water over a metal catalyst, rather than being oxidized by oxygen, which translates to a "selective catalytic reduction technique".
For a common boiler, because the denitration reducing agent is used in a small amount, a metering pump/plunger pump is commonly used as a reducing agent delivery pump in the process, and an electric valve is used for controlling the pressure flow of the backflow, however, the inventor finds that: the existing control method has high investment, more importantly, the requirements on the filtration precision of the conveyed liquid are high, the requirements on use and maintenance are also high, a pump body is easy to damage, the flow of the reducing agent is unstable, the flow pulsation and noise are large, the overhaul is troublesome, and the operation is unstable.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the foretell prior art, the utility model provides a flow, pressure control device of tail gas denitration, the device not only easy maintenance, the cost is low, compact structure has job stabilization's characteristics moreover. In order to achieve the above object, the technical solution of the present invention is specifically as follows:
a flow and pressure control device for tail gas denitration comprises: reducing agent storage tank, pump inlet pipeline, first valve, filter, centrifugal pump, check valve, second valve, pump outlet pipeline, manometer, measurement hybrid system, backflow pipeline, manual valve and back pressure valve, wherein: the reducing agent delivery unit comprises a first valve, a filter, a centrifugal pump, a check valve and a second valve which are sequentially connected through pipelines, the second valve is connected with the metering and mixing system through a pump outlet pipeline, two ends of the return pipeline are respectively connected with an inlet of the reducing agent storage tank and a pump outlet pipeline, the pressure gauge is arranged on the pump outlet pipeline between the return pipeline and the second valve, the manual valve and the backpressure valve are both arranged on the return pipeline, and the backpressure valve is close to the inlet of the reducing agent storage tank; the pipe diameter of the backflow pipeline is consistent with that of the outlet of the centrifugal pump.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained:
(1) the utility model discloses an adopt the centrifugal pump as the conveyor of reductant, realized fluidic even transportation in succession, avoided the not enough of flow pulsation and the big noise that current method exists for whole controlling means work is more stable, compact structure moreover, easy maintenance, the cost is low.
(2) Simultaneously because the centrifugal pump outlet flow is big, for the control flow, the utility model discloses an adopt the scheme that backflow pipeline pipe diameter and centrifugal pump outlet pipe diameter are unanimous, inside returning large-traffic liquid to the reductant storage tank, realized the control of minimum flow.
(3) For electric valve control before, the utility model discloses a cooperation of manual valve and back pressure valve is used, and the fluid pressure of control is stable, not only provides stable pressure for follow-up spray gun, has optimized denitration technology simultaneously, has saved the investment, makes the operation more stable simultaneously.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is the embodiment of the utility model provides an in the embodiment of the flow of tail gas denitration, pressure control device's schematic structure diagram.
The reference numerals in the drawings denote: 1-reducing agent storage tank, 2-pump inlet pipeline, 3-first valve, 4-filter, 5-centrifugal pump, 6-check valve, 7-second valve, 8-pump outlet pipeline, 9-pressure gauge, 10-metering mixing system, 11-reflux pipeline, 12-manual valve and 13-back pressure valve.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the current control method has high investment, and more importantly, has high requirements on the filtration precision of the conveyed liquid, high requirements on use and maintenance, easy damage to the pump body, unstable flow of the reducing agent, large flow pulsation and noise, troublesome overhaul and unstable operation. Therefore, the utility model provides a flow, pressure control device of tail gas denitration, it is right now to combine figure and detailed implementation mode the utility model discloses further explain.
First embodimentReferring to fig. 1, the flow and pressure control device for tail gas denitration according to the present invention comprises: reducing agent storage tank 1, pump inlet pipeline 2, first valve 3, filter 4, centrifugal pump 5, check valve 6, second valve 7, pump outlet pipeline 8, manometer 9, metering and mixing system 10, return line 11, manual valve 12 and back pressure valve 13.
1 export of reductant storage tank, pump inlet pipeline 2, reductant conveying unit connect gradually, reductant conveying unit includes the first valve 3 that connects gradually through the pipeline, filter 4, centrifugal pump 5, check valve 6 and second valve 7, connect through pump outlet pipe way 8 between second valve 7 and the metering and mixing system 10, the both ends of backflow pipeline 11 are connected with import, pump outlet pipe way 8 of reductant storage tank 1 respectively, manometer 9 sets up on pump outlet pipe way 8 between backflow pipeline 11 and second valve 7, just backflow pipeline 11 pipe diameter is unanimous with 5 outlet pipe diameters of centrifugal pump. In this embodiment, the centrifugal pump export is divided into two the tunnel, and partly liquid flows through return line, manual valve, back pressure valve and gets into the reductant jar body, and partly liquid gets into the metering and mixing system and goes boiler denitration spray gun. Because of the boiler denitration reductant quantity commonly used is little, and centrifugal pump outlet flow is big, so for the control flow, the pipe diameter of backward flow pipeline must be unanimous with the pipe diameter of pump outlet pipeline, through back pressure valve, manual valve and the continuous control of measurement hybrid system, with the internal portion of jar of large-traffic liquid return, realized the control of minimum flow.
The manual valve 12 and the backpressure valve 13 are both installed on the return pipeline 11, and the backpressure valve 13 is arranged close to the inlet of the reducing agent storage tank 1. Adopt motorised valve control reflux flow pressure among the current controlling means, but this kind of method investment, operation, maintenance cost are high, the utility model discloses a back pressure valve makes control fluid pressure more stable, and simple process is with low costs moreover, not only provides stable pressure for follow-up spray gun, has optimized denitration technology simultaneously, has saved the investment, makes the operation more stable simultaneously.
It is understood that on the basis of the first embodiment, the following technical solutions including but not limited to the following may be derived to solve different technical problems and achieve different purposes of the invention, and specific examples are as follows:
second embodimentThe centrifugal pump 5 is an impeller type centrifugal pump, adopts the centrifugal pump as a reducing agent conveying device, has the characteristic of continuously and uniformly conveying fluid, avoids the defects of large flow pulsation and noise in the existing method, and ensures that the whole control device works more stably, and has compact structure, convenient maintenance and low manufacturing cost.
Third embodimentThe first valve 3, the second valve 7 and the manual valve 12 are all manual ball valves. Through adopting backpressure valve control pump body pressure, for better control flow simultaneously, use a manual valve to match with the backpressure valve for control fluid pressure is more stable. The back pressure valve is operated by the elastic force of the built-in spring, and when the system pressure is lower than the set pressure, the diaphragm blocks the pipeline under the action of the elastic force of the spring; when the pressure of the system is higher than the set pressure, the diaphragm compresses the spring, the pipeline is connected, and the liquid passes through the backpressure valve. The backpressure valve can keep the pressure required by a pipeline, so that the pressure output by the centrifugal pump meets the requirement required by a subsequent system, and the pressure of the backpressure valve 13 is generally set between 0.3 and 0.8 MPa.
Fourth embodimentWith continued reference to fig. 1, the reductant delivery unit is two identical and parallel lines, i.e. the second valves 7 of the two reductant delivery units are all merged at the pump outlet conduit 8. By arranging the two reducing agent conveying units, one of the two reducing agent conveying units can be used for standby, and the stable and continuous operation of the denitration process is ensured.
Fifth embodimentSince solutions such as liquid ammonia, ammonia water, urea are corrosive liquids, corrosion-resistant materials need to be selected for each pipeline, and 304 stainless steel is adopted in this embodiment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a flow, pressure control device of tail gas denitration which characterized in that includes: reducing agent storage tank, pump inlet pipeline, first valve, filter, centrifugal pump, check valve, second valve, pump outlet pipeline, manometer, measurement hybrid system, backflow pipeline, manual valve and back pressure valve, wherein: the reducing agent delivery unit comprises a first valve, a filter, a centrifugal pump, a check valve and a second valve which are sequentially connected through pipelines, the second valve is connected with the metering and mixing system through a pump outlet pipeline, two ends of the return pipeline are respectively connected with an inlet of the reducing agent storage tank and a pump outlet pipeline, the pressure gauge is arranged on the pump outlet pipeline between the return pipeline and the second valve, the manual valve and the backpressure valve are both arranged on the return pipeline, and the backpressure valve is close to the inlet of the reducing agent storage tank; the pipe diameter of the backflow pipeline is consistent with that of the outlet of the centrifugal pump.
2. The apparatus for controlling flow and pressure of denitration of exhaust gas according to claim 1, wherein said centrifugal pump is an impeller-type centrifugal pump.
3. The apparatus for controlling flow and pressure of denitration of exhaust gas according to claim 1, wherein the first valve and the second valve are both manual ball valves.
4. The flow and pressure control device for denitration of exhaust gas according to claim 1, wherein the manual valve is a manual ball valve.
5. The flow and pressure control device for tail gas denitration according to any one of claims 1 to 4, wherein the reducing agent conveying units are two identical and connected in parallel, namely, the second valves of the two reducing agent conveying units are all merged at a pump outlet pipeline.
6. The apparatus for controlling a flow rate and a pressure of an exhaust gas denitration system according to any one of claims 1 to 4, wherein each pipe is made of a corrosion-resistant material.
7. The apparatus for controlling a flow rate and a pressure of denitration of exhaust gas according to claim 6, wherein each pipe is made of 304 stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922301961.7U CN211358348U (en) | 2019-12-18 | 2019-12-18 | Flow and pressure control device for tail gas denitration |
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| CN201922301961.7U CN211358348U (en) | 2019-12-18 | 2019-12-18 | Flow and pressure control device for tail gas denitration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897445A (en) * | 2021-03-24 | 2021-06-04 | 大唐环境产业集团股份有限公司 | Medicine adding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897445A (en) * | 2021-03-24 | 2021-06-04 | 大唐环境产业集团股份有限公司 | Medicine adding device |
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