CN218944732U

CN218944732U - Novel urea SNCR denitration system applied to small and medium-sized boilers

Info

Publication number: CN218944732U
Application number: CN202223011889.2U
Authority: CN
Inventors: 张永刚; 赵秀平; 孟霞
Original assignee: Tuopu Beijing Technology Co ltd
Current assignee: Tuopu Beijing Technology Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-05-02
Anticipated expiration: 2032-11-14

Abstract

The utility model discloses a novel urea SNCR denitration system applied to a medium-sized and small-sized boiler, and relates to the technical field of environmental protection. The utility model solves the problems of small flow of urea solution and difficult precise control, eliminates a dilution water system, solves the problem that the dilution water flows back to a urea solution pipeline when the load of a boiler fluctuates, reduces equipment of a denitration system, simplifies a control system, improves the reliability of the denitration system, reduces the overall investment of denitration, reduces the concentration of urea solution from 50% to 10%, and reduces the precipitation temperature of urea particles, thereby reducing the heat tracing temperature of a urea solution storage tank, saving energy and reducing operation cost.

Description

Novel urea SNCR denitration system applied to small and medium-sized boilers

Technical Field

The utility model relates to the technical field of environmental protection, in particular to a novel urea SNCR denitration system applied to a medium-sized and small-sized boiler.

Background

With the increasingly strict environmental protection requirements, a large number of small and medium-sized boilers also need new denitration systems, and the urea SNCR denitration system with low investment, reliable performance and no new increase of a large dangerous source becomes the first choice. The main flow process of the prior urea SNCR denitration system of the medium and small-sized boiler is that urea particles are prepared into 50% urea solution, then the urea solution is mixed with dilution water in a pipeline, and the diluted urea solution with the concentration of 10% is sprayed into a region with proper temperature in a hearth through a spray gun for denitration.

The process has the following three problems: firstly, the flue gas amount of a small and medium-sized boiler is small, the concentration of NOx is low, the required urea solution is small, and the adding amount of the urea solution is difficult to accurately control due to the fact that the flow rate of the urea solution passing through a regulating valve is too small; secondly, the urea solution and the dilution water are respectively provided by respective delivery pumps, and when the load of the boiler fluctuates, the flow and the pressure of the urea solution also fluctuate, so that the problem that the dilution water flows back to a urea solution pipeline due to the fact that the dilution water pressure is larger than the urea pressure is easily caused; the system has complex composition, and the main equipment comprises a urea solution dissolving tank, a urea solution dissolving storage tank, a urea solution dissolving and conveying pump, a dilution water tank, a dilution water pump and the like, so that the control is complicated, and the investment is high.

Disclosure of Invention

The utility model aims to provide a novel urea SNCR denitration system applied to a small-medium-sized boiler so as to solve the defects in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: including the urea dissolving tank, one side of urea dissolving tank is equipped with screw conveyer, screw conveyer and urea dissolving tank intercommunication, the opposite side of urea dissolving tank is equipped with the urea solution storage tank, one side of urea dissolving tank, one side of urea solution storage tank all sets up the level gauge, the top of urea solution storage tank one side all communicates first trench, the below of urea dissolving tank one side, the below of urea solution storage tank one side all with corresponding first trench through first violently managing the intercommunication, the below of urea dissolving tank opposite side, the below of urea solution storage tank opposite side is equipped with a pipeline, pipeline and the horizontal pipe of second pass through the standpipe intercommunication, the second violently pipe on the urea dissolving tank passes through the connecting pipe and communicates with the urea solution storage tank, the upper end of connecting pipe sets up needle valve, set up ball valve from left to right side in proper order on the second violently managing, Y type filter, second trench, urea solution circulating pump and ball valve, second trench and corresponding second violently manage the intercommunication and set up with the second between the corresponding first trench, set up the ball valve on the standpipe, the pipe sets up the pipe, the pipeline sets up the check valve on the two ends on the pipe, the pipe sets up the check valve on the two ends of the connecting pipe and the two automatic side of urea solution storage tank, the check valve sets up the check valve on the two pipe and the two ends of the pipe.

The novel urea SNCR denitration system applied to the medium-sized and small-sized boilers comprises the stirring device, wherein the stirring device is formed by a stirring motor, a stirring rod and a stirring paddle, the stirring paddle is fixedly arranged at the lower end of the stirring rod, the stirring rod and the stirring paddle are positioned in the urea dissolving tank, the stirring motor is arranged above the urea dissolving tank, and an output shaft of the stirring motor is fixedly connected with the upper end of the stirring rod.

The novel urea SNCR denitration system applied to the medium-sized and small-sized boilers is characterized in that the upper part of the other side of the urea dissolving tank and the upper part of the other side of the urea solution storage tank are provided with the on-site display thermometers.

The novel urea SNCR denitration system applied to the medium-small boiler is characterized in that the heat preservation layer is arranged on the pipe communicated with the first trench of the urea solution storage tank.

The utility model has the advantages that: the utility model solves the problems of small flow of urea solution and difficult precise control, eliminates a dilution water system, solves the problem that the dilution water flows back to a urea solution pipeline when the load of a boiler fluctuates, reduces equipment of a denitration system, simplifies a control system, improves the reliability of the denitration system, reduces the overall investment of denitration, reduces the concentration of urea solution from 50% to 10%, and reduces the precipitation temperature of urea particles, thereby reducing the heat tracing temperature of a urea solution storage tank, saving energy and reducing operation cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Reference numerals: 1-urea dissolving tank, 2-screw conveyer, 3-urea solution storage tank, 4-level gauge, 5-first trench, 6-first horizontal pipe, 7-second horizontal pipe, 8-pipeline, 9-standpipe, 10-connecting pipe, 11-agitator motor, 12-puddler, 13-stirring rake, 14-ball valve, 15-Y type filter, 16-second trench, 17-urea solution circulating pump, 18-needle valve, 19-butterfly valve, 20-check valve, 21-urea solution outlet pipe, 22-pipe, 23-automatically regulated valve.

Detailed Description

As shown in fig. 1, the embodiment specifically discloses a novel urea SNCR denitration system applied to a small-and-medium-sized boiler, which comprises a urea dissolving tank 1, wherein a stirring device is arranged in the urea dissolving tank 1, the stirring device consists of a stirring motor 11, a stirring rod 12 and a stirring paddle 13, the stirring paddle 13 is fixedly arranged at the lower end of the stirring rod 12, the stirring rod 12 and the stirring paddle 13 are positioned in the urea dissolving tank 1, the stirring motor 11 is arranged above the urea dissolving tank 1, and an output shaft of the stirring motor 11 is fixedly connected with the upper end of the stirring rod 12; one side of the urea dissolving tank 1 is provided with a screw conveyor 2, the screw conveyor 2 is communicated with the urea dissolving tank 1, the other side of the urea dissolving tank 1 is provided with a urea solution storage tank 3, one side of the urea dissolving tank 1 and one side of the urea solution storage tank 3 are provided with liquid level gauges 4, the upper part of one side of the urea dissolving tank 1 and the upper part of one side of the urea solution storage tank 3 are communicated with a first trench 5, the lower part of one side of the urea dissolving tank 1 and the lower part of one side of the urea solution storage tank 3 are communicated with the corresponding first trench 5 through a first transverse pipe 6, the lower part of the other side of the urea dissolving tank 1 and the lower part of the other side of the urea solution storage tank 3 are fixedly provided with a second transverse pipe 7, the upper parts of the urea dissolving tank 1 and the urea solution storage tank 3 are provided with a pipeline 8, the pipeline 8 and the second transverse pipe 7 are communicated with the urea solution storage tank 3 through a vertical pipe 9, the upper end of the connecting pipe 10 is provided with a needle valve 18, the second horizontal pipe 7 is provided with a ball valve 14, a Y-shaped filter 15, a second trench 16, a urea solution circulating pump 17 and a ball valve 14 in sequence from left to right, the second trench 16 is communicated with the corresponding second horizontal pipe 7 and is provided with the ball valve 14 between the second horizontal pipe 7, the vertical pipe 9 is provided with the ball valve 14, one end of the pipeline 8 is provided with a butterfly valve 19, the pipeline 8 is communicated with the urea dissolving tank 1, two second horizontal pipes 7 on the urea solution storage tank 3 are provided with check valves 20, the check valves 20 are positioned between the urea solution circulating pump 17 and the ball valve 14 on the rightmost side, the two second horizontal pipes 7 on the urea solution storage tank 3 are communicated with a urea solution outflow pipe 21, the urea solution outflow pipe 21 is communicated with the upper end of the urea solution storage tank 3 through a circular pipe 22, the upper end of the circular pipe 22 is provided with an automatic regulating valve 23, the upper part of the other side of the urea dissolving tank 1, the upper parts of the other sides of the urea solution storage tanks 3 are provided with on-site display thermometers, and the pipes of the urea solution storage tanks 3 and the first trench 5 are provided with heat preservation layers.

In the urea dissolving stage, the urea particles are directly prepared into 10% urea solution, and the 10% urea solution is directly sprayed into a region with proper temperature in a hearth through a spray gun for denitration, so that equipment and pipelines related to dilution water are eliminated. The urea SNCR denitration system of the small and medium-sized boilers without dilution water increases the flow of urea solution passing through the regulating valve, and solves the problems that the flow of urea solution is small and the urea solution is difficult to control accurately. The dilution water system is omitted, and the problem that the dilution water flows back to the urea solution pipeline when the load of the boiler fluctuates is solved. The equipment of the denitration system is reduced, the control system is simplified, the reliability of the denitration system is improved, and the overall investment of denitration is reduced. The concentration of the urea solution is reduced from 50% to 10%, and the precipitation temperature of urea particles is reduced accordingly, so that the heat tracing temperature of the urea solution storage tank can be reduced, energy sources are saved, and the operation cost is reduced.

The foregoing description of the embodiments of the present utility model has been presented in conjunction with the following drawings, but is not to be construed as limiting the scope of the utility model, which is defined by the detailed description of the utility model.

Claims

1. Be applied to novel urea SNCR deNOx systems of medium-and-small-size boiler, its characterized in that: including urea dissolving tank (1), one side of urea dissolving tank (1) is equipped with screw conveyer (2), screw conveyer (2) and urea dissolving tank (1) intercommunication, the opposite side of urea dissolving tank (1) is equipped with urea solution storage tank (3), one side of urea dissolving tank (1), one side of urea solution storage tank (3) all sets up level gauge (4), the top of urea dissolving tank (1) one side, the top of urea solution storage tank (3) one side all communicates first trench (5), the below of urea dissolving tank (1) one side, the below of urea solution storage tank (3) one side all communicates through first cross tube (6) with corresponding first trench (5), the below of urea dissolving tank (1) opposite side, the below of urea solution storage tank (3) opposite side all fixed mounting second cross tube (7), the top of urea dissolving tank (1) and urea solution storage tank (3) is equipped with one pipeline (8), pipeline (8) and second cross tube (7) are through standpipe (9) intercommunication, the second cross tube (7) on urea dissolving tank (1) on one side all communicates through riser (10) and cross tube (10), set up through connecting tube (10) on the connecting tube (18) in proper order, set up from cross tube (10) on the side of connecting tube (18) Y type filter (15), second trench (16), urea solution circulating pump (17) and ball valve (14), second trench (16) and corresponding second violently manage (7) intercommunication and set up ball valve (14) between violently managing (7) with the second, set up ball valve (14) on standpipe (9), the one end of pipeline (8) sets up butterfly valve (19), pipeline (8) and urea dissolving tank (1) intercommunication, set up check valve (20) on two second on urea solution storage tank (3) violently managing (7), check valve (20) are located between urea solution circulating pump (17) and ball valve (14) on the right side, two second on urea solution storage tank (3) violently manage (21) intercommunication urea solution outlet pipe, urea solution outlet pipe (21) and urea solution storage tank (3)'s upper end are through pipe (22) intercommunication, the upper end of pipe (22) sets up automatic regulating valve (23).

2. The novel urea SNCR denitration system applied to a small-and-medium-sized boiler according to claim 1, wherein: the urea dissolving tank (1) in set up agitating unit, agitating unit comprises agitator motor (11), puddler (12) and stirring rake (13), the lower extreme fixed mounting stirring rake (13) of puddler (12), stirring rake (13) are located urea dissolving tank (1), the top of urea dissolving tank (1) sets up agitator motor (11), the output shaft of agitator motor (11) and the upper end fixed connection of puddler (12).

3. The novel urea SNCR denitration system applied to a small-and-medium-sized boiler according to claim 1, wherein: the upper part of the other side of the urea dissolving tank (1) and the upper part of the other side of the urea solution storage tank (3) are provided with in-situ display thermometers.

4. The novel urea SNCR denitration system applied to a small-and-medium-sized boiler according to claim 1, wherein: and an insulation layer is arranged on a pipe communicated with the first trench (5) by the urea solution storage tank (3).