A fully automatic denitrification and regulation device for industrial boiler exhaust gas.

Abstract

This utility model relates to the field of exhaust gas denitrification technology, and in particular to a fully automatic denitrification device for industrial boiler exhaust gas. The technical solution includes: a cylinder, a liquid inlet mechanism installed on the outside of the cylinder, and a turbine guide frame installed inside the cylinder. An exhaust port is provided at the top of the cylinder, an air inlet pipe is provided on the side wall of the cylinder, and a liquid outlet pipe is provided at the bottom of the cylinder. A maintenance cover is detachably installed on the side wall of the cylinder above the liquid outlet pipe, and a connecting pipe is provided on the side wall of the cylinder. A nozzle for atomizing and spraying urea denitrification liquid into the cylinder is installed at the connecting pipe. The turbine guide frame is installed inside the cylinder below the exhaust port, and the turbine guide frame is used to extend the residence time of the exhaust gas entering the cylinder. This utility model solves the problems of inconvenient residual liquid recovery and low denitrification efficiency caused by short exhaust gas residence time in existing equipment.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas denitrification technology, specifically a fully automatic denitrification device for industrial boiler exhaust gas. Background Technology

[0002] Industrial boilers generate large amounts of exhaust gas containing nitrogen oxides during operation. Nitrogen oxides are among the major air pollutants, causing not only environmental problems such as acid rain and photochemical smog, but also adversely affecting human health. Therefore, denitrification treatment of industrial boiler exhaust gas is a crucial step in environmental protection and ensuring compliance with emission standards in industrial production. Currently, industrial boiler exhaust gas denitrification commonly employs selective non-catalytic reduction (SNR) or selective catalytic reduction (SCR) technologies. Among these, the process using urea as a denitrification reducing agent is widely used due to its low cost and ease of operation. The principle involves atomizing a urea solution and spraying it into the exhaust gas, where it reacts chemically with nitrogen oxides under specific temperature conditions, converting the nitrogen oxides into harmless nitrogen and water.

[0003] However, in existing industrial boiler exhaust gas denitrification equipment, the urea solution used in the denitrification process is prone to leave residues inside the equipment, and the long-term accumulation of residual liquid will affect the normal operation of the equipment. At the same time, the exhaust gas discharged from industrial boilers usually has a high flow rate, and the existing equipment lacks an effective flow guiding structure, which results in a short residence time of the exhaust gas inside the equipment. This leads to insufficient contact and reaction between the urea denitrification liquid and the exhaust gas, thereby affecting the denitrification efficiency and making it difficult to meet increasingly stringent environmental emission standards.

[0004] To address this issue, a fully automated denitrification and regulation device for industrial boiler exhaust gas is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a fully automatic denitrification device for industrial boiler exhaust gas, which has the advantages of easy recovery of residual liquid and extended exhaust gas residence time to improve denitrification efficiency, and solves the problems of inconvenient recovery of residual liquid and short exhaust gas residence time leading to low denitrification efficiency in existing equipment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fully automatic denitrification device for industrial boiler exhaust gas, comprising a cylinder, a liquid inlet mechanism installed on the outside of the cylinder, and a turbine guide frame installed inside the cylinder. The top of the cylinder has an exhaust port, the side wall of the cylinder has an air inlet pipe, and the bottom of the cylinder has a liquid outlet pipe. A maintenance cover is detachably installed on the side wall of the cylinder above the liquid outlet pipe, and a connecting pipe is provided on the side wall of the cylinder. A nozzle for atomizing and spraying urea denitrification liquid into the cylinder is installed at the connecting pipe. The turbine guide frame is installed inside the cylinder below the exhaust port. The turbine guide frame is used to extend the residence time of the exhaust gas entering the cylinder. The turbine guide frame includes an annular mounting base and multiple guide blades evenly distributed on the annular mounting base. The guide blades are inclined at a preset angle to the annular mounting base.

[0007] Preferably, the connecting pipes are arranged in a ring array of multiple pipes, and each connecting pipe is equipped with a corresponding nozzle.

[0008] In the design, multiple connecting pipes arranged in a ring array and a nozzle installed on each connecting pipe achieve a uniform ring-shaped spray of urea denitrification liquid inside the cylinder. This has the advantages of allowing the denitrification liquid to come into more comprehensive contact with the exhaust gas entering the cylinder and avoiding insufficient reaction caused by insufficient coverage of denitrification liquid in local areas.

[0009] Preferably, the nozzle is a high-pressure atomizing nozzle, and the spray direction of the nozzle is towards the central area of ​​the cylinder.

[0010] In the design, the nozzle, which serves as a high-pressure atomizing nozzle, and the spray direction toward the center of the cylinder achieve a finer atomization effect of the urea denitrification liquid. At the same time, the atomized denitrification liquid converges toward the center of the cylinder, which has the advantages of significantly improving the mixing uniformity of the denitrification liquid and the exhaust gas, reducing the waste of denitrification liquid, and enhancing the reaction efficiency.

[0011] Preferably, the liquid inlet mechanism includes a liquid inlet pipe, a ring pipe installed on the liquid inlet pipe, an injection pipe installed on the ring pipe, and the injection pipe connected to the nozzle through a connecting flange.

[0012] The design incorporates an inlet mechanism consisting of an inlet pipe, a ring pipe mounted on the inlet pipe, an injection pipe mounted on the ring pipe, and a structure connecting the injection pipe and the nozzle via a connecting flange. This mechanism ensures the stable delivery of urea denitrification liquid from an external supply device to the nozzle, while also achieving reliable connection between the inlet mechanism and the nozzle. It guarantees the continuity of denitrification liquid supply to maintain stable denitrification operations and offers the advantage of convenient subsequent disassembly and maintenance via the connecting flange.

[0013] Preferably, the ring tube is an annular structure concentrically arranged with the cylinder, and multiple injection tubes are evenly distributed along the circumference of the ring tube.

[0014] In the design, the annular structure of the ring pipe set concentrically with the cylinder and the multiple injection pipes evenly distributed along the circumference of the ring pipe achieve the uniform distribution of urea denitrification liquid in the ring pipe to each injection pipe. This has the advantages of ensuring that the amount of denitrification liquid delivered to the corresponding nozzle by each injection pipe is consistent, and further enhancing the uniformity of denitrification liquid spraying in the cylinder.

[0015] Preferably, one end of the inlet pipe is connected to an external urea denitrification liquid supply device, and a control valve for controlling the flow of liquid is installed on the inlet pipe.

[0016] In the design, the inlet pipe, which is connected to the external urea denitrification liquid supply device at one end, and the control valve installed on the inlet pipe realize the external connection and on / off control of the denitrification liquid supply. It has the advantages of being able to flexibly adjust the denitrification liquid supply status according to the industrial boiler exhaust gas emission volume, and avoiding waste caused by excessive supply of denitrification liquid or affecting the denitrification effect by insufficient supply.

[0017] Preferably, the inspection cover has a circular structure, and the inspection cover and the cylinder are detachably connected by a bolt assembly.

[0018] The design incorporates a circular inspection cover and a detachable connection to the cylinder via bolt assemblies, enabling convenient opening and closing of the inspection opening on the cylinder's side wall. This allows staff to easily inspect, clean, or replace parts inside the cylinder when the drain pipe becomes blocked, thereby reducing the difficulty of equipment maintenance.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This invention features a drain pipe at the bottom of the cylinder and a detachable inspection cover on the side wall above the drain pipe. The drain pipe directly collects residual urea liquid generated during the denitrification process inside the cylinder, preventing the residual liquid from accumulating inside the equipment for a long time. When the drain pipe becomes blocked or the residual liquid inside the cylinder needs to be thoroughly cleaned, the detachable inspection cover allows staff to easily open the cylinder for maintenance. This achieves the effect of facilitating the recovery of residual liquid and preventing residual accumulation from affecting the normal operation of the equipment, thus solving the problem of inconvenient residual liquid recovery in existing equipment.

[0021] This utility model features a turbine guide frame installed inside the cylinder below the exhaust port. The turbine guide frame includes an annular mounting seat and multiple guide blades evenly distributed on the annular mounting seat and inclined at a preset angle to the annular mounting seat, as well as a nozzle installed at the cylinder side wall connecting pipe for atomizing and spraying urea denitrification liquid into the cylinder.

[0022] After the exhaust gas from the industrial boiler enters the cylinder through the inlet pipe on the side wall, the inclined guide vanes of the turbine guide frame can guide and buffer the upward-flowing exhaust gas, change the exhaust gas flow path, and prolong the residence time of the exhaust gas in the cylinder.

[0023] At the same time, the nozzle atomizes and sprays urea denitrification liquid into the cylinder, allowing the exhaust gas and denitrification liquid to have a longer contact and reaction time. This achieves the effect of extending the exhaust gas residence time, improving the fullness of the reaction between the denitrification liquid and the exhaust gas, and thus improving the denitrification efficiency. This solves the problem that the short exhaust gas residence time of existing equipment easily leads to low denitrification efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0026] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 4 This is a schematic diagram of the cylinder mounting structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the liquid inlet mechanism of this utility model.

[0029] In the diagram: 1. Cylinder; 11. Exhaust port; 12. Inlet pipe; 13. Inspection cover; 14. Drain pipe; 15. Connecting pipe; 2. Liquid inlet mechanism; 21. Liquid inlet pipe; 22. Ring pipe; 23. Injection pipe; 24. Connecting flange; 3. Nozzle; 4. Turbine guide frame. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example

[0032] like Figures 1 to 5 As shown, one embodiment of this utility model is a fully automatic denitrification device for industrial boiler exhaust gas, including a cylinder 1, a liquid inlet mechanism 2 installed on the outside of the cylinder 1, and a turbine guide frame 4 installed inside the cylinder 1. The turbine guide frame 4 includes an annular mounting seat and multiple guide blades evenly distributed on the annular mounting seat. The guide blades are inclined at a preset angle to the annular mounting seat.

[0033] The top of the cylinder 1 is provided with an exhaust port 11, which is used to discharge the exhaust gas after denitrification treatment;

[0034] The side wall of the cylinder 1 is provided with an air inlet pipe 12, which is used to connect to the tail gas to be denitrified generated by the industrial boiler.

[0035] A drain pipe 14 is provided at the bottom of one side of the cylinder 1. The drain pipe 14 is used to collect the residual urea denitrification liquid generated during the denitrification process.

[0036] An inspection cover 13 is detachably installed on the side wall of the cylinder 1 above the drain pipe 14. The inspection cover 13 is circular and is detachably connected to the cylinder 1 by a bolt assembly, which facilitates the opening and closing operation of the personnel when the drain pipe 14 is blocked or when the inside of the cylinder 1 needs maintenance.

[0037] The side wall of the cylinder 1 is also provided with connecting pipes 15 in a ring array. The connecting pipes 15 are used to connect the external liquid supply structure and the internal spray structure, and each connecting pipe 15 is configured with a corresponding spray component.

[0038] A nozzle 3 is installed at the connecting pipe 15 via a flange. The nozzle 3 is a high-pressure atomizing nozzle. The spray direction of the nozzle 3 is towards the central area of ​​the cylinder 1. The nozzle 3 is used to atomize and spray urea denitrification liquid into the cylinder 1 to ensure that the atomized denitrification liquid can be evenly diffused in the cylinder 1 and fully contact the exhaust gas.

[0039] The liquid inlet mechanism 2 includes an inlet pipe 21, a ring pipe 22 and an injection pipe 23. One end of the inlet pipe 21 is connected to an external urea denitrification liquid supply device. A control valve for controlling the liquid flow is installed on the inlet pipe 21, which can flexibly adjust the denitrification liquid supply status according to the exhaust gas emission.

[0040] A ring pipe 22 is installed on the inlet pipe 21. The ring pipe 22 is an annular structure that is concentric with the cylinder 1. Urea denitrification liquid can be stably delivered into the ring pipe 22 by a pump.

[0041] A liquid injection pipe 23 is installed on the ring pipe 22. Multiple liquid injection pipes 23 are evenly distributed along the circumference of the ring pipe 22. The liquid injection pipes 23 are connected to the nozzle 3 through the connecting flange 24 to realize the uniform distribution and reliable delivery of denitrification liquid from the ring pipe 22 to the nozzle 3. At the same time, it is convenient for the subsequent disassembly and maintenance of the liquid inlet mechanism 2 and the nozzle 3.

[0042] A turbine guide frame 4 is installed inside the cylinder 1 below the exhaust port 11. The annular mounting seat of the turbine guide frame 4 is fixedly connected to the inner wall of the cylinder 1. A channel for exhaust gas passage is reserved in the middle of the annular mounting seat. Multiple guide blades evenly distributed therein are inclined at a preset angle to the annular mounting seat. When the exhaust gas from the industrial boiler enters the cylinder 1 from the inlet pipe 12, it is affected by the natural upward flow characteristics of the airflow. The exhaust gas first flows to the area below the annular mounting seat of the turbine guide frame 4, and then enters the inner area of ​​the multiple guide blades through the channel in the middle of the annular mounting seat.

[0043] The exhaust gas entering the inner region changes its original straight upward trajectory under the guidance of the inclined guide vanes and is dispersed and discharged to the outer region of the guide vanes. In this process, the flow path of the exhaust gas is significantly extended and the flow velocity is effectively buffered.

[0044] This flow guiding process can prevent exhaust gas from being discharged directly from exhaust port 11 due to excessive flow velocity, and can also allow exhaust gas to form a more complete diffusion flow in cylinder 1, thereby achieving more comprehensive contact and mixing with the atomized urea denitrification liquid sprayed by nozzle 3, ensuring that the two fully undergo denitrification reaction.

[0045] Finally, the clean exhaust gas after denitrification is discharged from the exhaust port 11, while the residual urea denitrification liquid that did not react completely during the denitrification process is collected at the bottom of the cylinder 1 under gravity and collected and recycled through the drain pipe 14, realizing the secondary use of the denitrification agent and the cleaning and maintenance of the equipment.

[0046] When using this utility model, the external liquid supply device is turned on, the control valve of the inlet pipe 21 is opened, and the delivery pump is started; the denitrification liquid flows into the ring pipe 22 concentric with the cylinder 1 through the inlet pipe 21, and is distributed to each nozzle 3 through the injection pipe 23 evenly distributed around the ring pipe 22. The pump speed or valve opening is adjusted according to the boiler exhaust gas emission, so that the high-pressure atomizing nozzle 3 stably sprays atomized denitrification liquid towards the center of the cylinder 1.

[0047] When the boiler exhaust valve is opened, the exhaust gas enters the cylinder 1 through the intake pipe 12 and flows upward. When it reaches the turbine guide frame 4, it enters the inner side of the guide vane through the middle channel of the annular mounting seat. Under the guidance of the inclined guide vane, it disperses to the outside and prolongs the residence time. At the same time, the nozzle 3 atomizes the denitrification liquid and fully contacts the exhaust gas, and a denitrification reaction occurs to convert nitrogen oxides.

[0048] When maintenance is required, stop the boiler tail gas valve, close the liquid supply device and the control valve of the liquid inlet pipe 21, stop the pump, and close the protective valve after the tail gas is discharged from the exhaust port 11; remove the bolts of the inspection cover 13, open the inspection cover 13 to clean the inside of the cylinder 1, and finally reseal it.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A full-automatic control and regulation denitration equipment for industrial boiler tail gas, comprising a cylinder (1), a liquid inlet mechanism (2) installed on the outer side of the cylinder (1), and a turbine guide frame (4) arranged in the cylinder (1), characterized in that: The top of the cylinder (1) is provided with an exhaust port (11), the side wall of the cylinder (1) is provided with an air inlet pipe (12), the bottom of the cylinder (1) is provided with a drain pipe (14), the side wall of the cylinder (1) above the drain pipe (14) is detachably equipped with a maintenance cover (13), the side wall of the cylinder (1) is provided with a connecting pipe (15); a nozzle (3) for atomizing and spraying urea denitrification liquid into the cylinder (1) is installed at the connecting pipe (15); the turbine guide frame (4) is installed in the cylinder (1) below the exhaust port (11), the turbine guide frame (4) is used to extend the residence time of the exhaust gas entering the cylinder (1) in the cylinder (1), the turbine guide frame (4) includes an annular mounting seat and multiple guide blades evenly distributed on the annular mounting seat, the guide blades are inclined at a preset angle to the annular mounting seat.

2. The full-automatic control and regulation denitration equipment for industrial boiler tail gas according to claim 1, characterized in that, The connecting pipes (15) are arranged in a ring array, and each connecting pipe (15) is equipped with a nozzle (3).

3. The full-automatic control and regulation denitration equipment for industrial boiler tail gas according to claim 1, characterized in that, The nozzle (3) is a high-pressure atomizing nozzle, and the spray direction of the nozzle (3) is towards the central area of ​​the cylinder (1).

4. The full-automatic control and regulation denitration equipment for industrial boiler tail gas according to claim 1, characterized in that, The liquid inlet mechanism (2) includes a liquid inlet pipe (21), a ring pipe (22) is installed on the liquid inlet pipe (21), and an injection pipe (23) is installed on the ring pipe (22). The injection pipe (23) is connected to the nozzle (3) through a connecting flange (24).

5. The full-automatic control and regulation denitration equipment for industrial boiler tail gas according to claim 4, characterized in that, The ring pipe (22) is a ring structure that is concentrically set with the cylinder (1), and multiple injection pipes (23) are evenly distributed along the circumference of the ring pipe (22).

6. The fully automatic denitrification and regulation equipment for industrial boiler exhaust gas according to claim 4, characterized in that, One end of the inlet pipe (21) is connected to an external urea denitrification liquid supply device, and a control valve for controlling the liquid flow is installed on the inlet pipe (21).

7. The full-automatic control and regulation denitration equipment for industrial boiler tail gas according to claim 1, characterized in that, The inspection cover (13) is circular in shape, and the inspection cover (13) and the cylinder (1) are detachably connected by bolt assembly.

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