CN216987031U

CN216987031U - Boiler denitration system

Info

Publication number: CN216987031U
Application number: CN202122297341.8U
Authority: CN
Inventors: 陈立栋; 陈延树; 陈立功; 陈树法; 孟昭金; 李波; 张保光; 王鲁
Original assignee: Dongshun International Trade Group Co ltd
Current assignee: Dongshun International Trade Group Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-07-19
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a boiler denitration system which comprises a desalted water tank, wherein the desalted water tank is connected with a desalted water flowing pipeline, the ammonia water tank is connected with an ammonia water flowing pipeline, a control valve I and a flow sensor I are respectively arranged on the desalted water flowing pipeline, a control valve II and a flow sensor II are respectively arranged on the ammonia water flowing pipeline, the desalted water flowing pipeline is communicated with one end of the ammonia water flowing pipeline and is connected with a mixing tank, the lower end of the mixing tank is connected with a spray gun through a pipeline, a spray valve is arranged on the pipeline between the mixing tank and the spray gun, the other end of the mixing tank is connected with an air compressor through a connecting pipeline, a control valve III is installed on the connecting pipeline, the spray gun is arranged in a boiler, and a concentration sensor is further arranged in the boiler. The utility model can determine the use amount of the ammonia water and the demineralized water according to the flue gas concentration in the boiler, can save the demineralized water, can improve the atomization effect and reduce the ammonia escape rate.

Description

Boiler denitration system

Technical Field

The utility model relates to the technical field of denitration processes, in particular to a boiler denitration system.

Background

With the increasing requirement of environmental protection, the emission standard of nitrogen oxide (NOx) pollutants is higher and higher. The flue gas denitration technology can be divided into a Selective Catalytic Reduction (SCR) flue gas denitration technology and a selective non-catalytic reduction (SNCR) flue gas denitration technology. The SNCR has the characteristics of low cost, simple process, moderate efficiency and the like, and is suitable for being applied to the existing circulating fluidized bed boiler. The basic principle is as follows: and (3) spraying reducing agents containing amino, such as ammonia, urea and the like, into a temperature area of 850-1100 ℃ of the boiler, fully mixing with the NOX in the flue gas, and carrying out NOX reduction reaction to generate pollution-free N2 and H2O.

However, in the practical application process, the dosage of ammonia water and demineralized water is larger by adopting the SNCR technology, so in order to better reduce the nitrogen oxides in the flue gas and simultaneously reduce the dosage of the ammonia water and the demineralized water, a boiler denitration system is provided to solve the problems.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a boiler denitration system which comprises a desalting water tank, an ammonia water tank, a first control valve, a first flow sensor, a second control valve, a second flow sensor, a desalting water flow pipeline, an ammonia water flow pipeline, a mixing tank, a spray gun, an air compressor, a connecting pipeline, a third control valve, a control module, a boiler, a spray valve and a concentration sensor, wherein the desalting water tank is connected with the desalting water flow pipeline, the ammonia water tank is connected with the ammonia water flow pipeline, the desalting water flow pipeline is respectively provided with the first control valve and the first flow sensor, the ammonia water flow pipeline is respectively provided with the second control valve and the second flow sensor, one ends of the desalting water flow pipeline and the ammonia water flow pipeline are communicated and connected with the mixing tank, the lower end of the mixing tank is connected with the spray gun through a pipeline, and the pipeline between the mixing tank and the spray gun is provided with the spray valve, the mixing tank other end passes through the connecting tube and is connected with air compressor, the last control valve three of installing of connecting tube, the spray gun sets up inside the boiler, and still is provided with concentration sensor in the boiler.

Preferably, the control module is respectively connected with the first control valve, the first flow sensor, the second control valve, the second flow sensor, the air compressor, the third control valve, the spray valve and the concentration sensor.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the desalting water tank, the ammonia water tank, the control valve I, the flow sensor I, the control valve II, the flow sensor II, the desalting water flow pipeline, the ammonia water flow pipeline and the mixing tank are arranged, so that the control module can determine the use amounts of ammonia water and desalting water according to the flue gas concentration in the boiler, the desalting water can be saved, the atomization effect can be improved, the escape rate of ammonia can be reduced, and the effect is good.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure:

1. a desalting water tank; 2. an ammonia tank; 3. a first control valve; 4. a first flow sensor; 5. a second control valve; 6. a flow sensor II; 7. a demineralized water flow conduit; 8. an ammonia flow line; 9. a mixing tank; 10. A spray gun; 11. an air compressor; 12. connecting a pipeline; 13. a third control valve; 14. a control module; 15. A boiler; 16. a spray valve; 17. a concentration sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1, the present invention provides a technical solution: a boiler denitration system comprises a demineralized water tank 1, an ammonia water tank 2, a control valve 3, a flow sensor 4, a control valve two 5, a flow sensor two 6, a demineralized water flowing pipeline 7, an ammonia water flowing pipeline 8, a mixing tank 9, a spray gun 10, an air compressor 11, a connecting pipeline 12, a control valve three 13, a control module 14, a boiler 15, a spray valve 16 and a concentration sensor 17, wherein the demineralized water tank 1 is connected with the demineralized water flowing pipeline 7, the ammonia water tank 2 is connected with the ammonia water flowing pipeline 8, the demineralized water flowing pipeline 7 is respectively provided with the control valve 3 and the flow sensor 4, the ammonia water flowing pipeline 8 is respectively provided with the control valve two 5 and the flow sensor two 6, one ends of the demineralized water flowing pipeline 7 and the ammonia water flowing pipeline 8 are communicated and are connected with the mixing tank 9, the lower end of the mixing tank 9 is connected with the spray gun 10 through a pipeline, be provided with spray valve 16 on the pipeline between blending tank 9 and the spray gun 10, the blending tank 9 other end passes through connecting tube 12 and is connected with air compressor 11, install control valve three 13 on the connecting tube 12, spray gun 10 sets up inside boiler 15, and still is provided with concentration sensor 17 in the boiler 15, control module 14 is connected with control valve one 3, flow sensor one 4, control valve two 5, flow sensor two 6, air compressor 11, three 13 of control valve, spray valve 16, concentration sensor 17 respectively.

Specifically, the method comprises the following steps:

the method comprises the following steps: the concentration sensor 17 transmits the detected flue gas concentration in the boiler 15 to the control module 14, and the control module 14 regulates and controls the amount of the ammonia water and the demineralized water according to the obtained concentration value;

step two: the control module 14 respectively controls the first control valve 3 and the second control valve 5 to be opened, so that the ammonia water and the desalted water can respectively flow into the mixing tank through the ammonia water flow pipeline 8 and the desalted water flow pipeline 7, in the process, the flow of the desalted water and the ammonia water is constantly monitored through the first flow sensor 4 and the second flow sensor 6, and when the flow reaches a preset value, the first control valve 3 and the second control valve 5 are controlled to be closed;

step three: ammonia water and demineralized water are mixed through mixing tank 9 and are configured into a reducing agent, control module 14 opens control valve III 13 and spray valve 16, and control air compressor 11 starts simultaneously, makes compressed air can get into mixing tank 9 through connecting tube 12 in, promotes the reducing agent blowout, and then reduces the flue gas in boiler 15 into nitrogen gas and water.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a boiler denitration system, its characterized in that, including demineralized water jar (1), aqueous ammonia jar (2), control valve (3), flow sensor (4), control valve (5), flow sensor (6), demineralized water flow pipeline (7), aqueous ammonia flow pipeline (8), blending tank (9), spray gun (10), air compressor (11), connecting tube (12), control valve (13), control module (14), boiler (15), spray valve (16), concentration sensor (17), demineralized water jar (1) is connected with demineralized water flow pipeline (7), aqueous ammonia jar (2) is connected with aqueous ammonia flow pipeline (8), be provided with control valve (3) and flow sensor (4) on demineralized water flow pipeline (7) respectively, be provided with control valve (5) on aqueous ammonia flow pipeline (8) respectively, Flow sensor two (6), the one end intercommunication of demineralized water flow tube way (7) and aqueous ammonia flow tube way (8), and be connected with blending tank (9), the lower extreme of blending tank (9) passes through the pipeline and is connected with spray gun (10), be provided with on the pipeline between blending tank (9) and spray gun (10) and spray valve (16), the blending tank (9) other end passes through connecting tube (12) and is connected with air compressor (11), install control valve three (13) on connecting tube (12), spray gun (10) set up inside boiler (15), and still be provided with concentration sensor (17) in boiler (15).

2. The boiler denitration system of claim 1, wherein: the control module (14) is respectively connected with the first control valve (3), the first flow sensor (4), the second control valve (5), the second flow sensor (6), the air compressor (11), the third control valve (13), the spray valve (16) and the concentration sensor (17).