Boiler waste gas treatment device for thermal power plant

Abstract

The utility model relates to the technical field of waste gas treatment, and particularly discloses a boiler waste gas treatment device for a thermal power plant, which comprises a honeycomb catalytic denitration section, a rotational flow spray desulfurization section and a cyclone dust collector which are sequentially arranged from top to bottom, a continuous airflow channel is formed among the honeycomb catalytic denitration section, the rotational flow spray desulfurization section and the cyclone dust collector through variable-diameter connecting pipes which are connected through flanges; the honeycomb catalytic denitration section comprises a drawable drawer which is filled with a vanadium-tungsten-titanium honeycomb catalyst; high-temperature waste gas enters a cyclone dust collector to complete primary dust removal, rises to a rotational flow spraying desulfurization section to be subjected to vortex reaction with reverse atomized lime slurry, passes through a demister and then enters a honeycomb catalytic denitration section to be subjected to reaction with sprayed ammonia gas under the action of a catalyst, and purified gas is discharged from the top, so that the waste gas treatment efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and specifically discloses a boiler waste gas treatment device for thermal power plants. Background Technology

[0002] Power plants typically use boilers to generate electricity. A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of heat energy. Existing boiler exhaust gases contain harmful substances such as sulfides and soot. Existing purification devices cannot completely remove sulfides and soot from boiler exhaust gases.

[0003] Chinese Patent No. CN216440263U discloses a boiler exhaust gas treatment device for thermal power plants, including a purification component, a filtration component, and a separation component. The purification component includes a water tank, inside which the filtration component and the separation component are vertically arranged. A screw hole is vertically through-hole on the top surface of the water tank, and an exhaust pipe is vertically through-hole-connected to the top surface of the water tank. A guide tube is through-hole-connected to the bottom surface of the water tank for guiding water into the water tank for easy drainage and water filling later. A valve is installed on the guide tube of the water tank. The filtration component is vertically rotatably installed inside the water tank, and the separation component is vertically inserted into the filtration component through the screw hole. This utility model can recover sulfides and soot in separate sections, ensuring the recovery and purification effect and improving the exhaust gas purification effect.

[0004] The aforementioned document only filters smoke and dust using filter cylinders and filter cloth pads, and removes sulfides through water. This makes the filter cylinders and filter cloth pads prone to clogging, affecting subsequent exhaust gas filtration. Furthermore, relying solely on water is insufficient for treating sulfur and pyrite in the exhaust gas, thus impacting the exhaust gas treatment effect. Therefore, a boiler exhaust gas treatment device for thermal power plants is needed to solve this problem. Utility Model Content

[0005] This utility model proposes a boiler exhaust gas treatment device for thermal power plants. The device involves the high-temperature exhaust gas entering a cyclone dust collector for primary dust removal, rising to the desulfurization section to react with the reverse atomized lime slurry in a vortex, passing through a demister, and then entering the denitrification section to react with the injected ammonia gas under the action of a catalyst. The purified gas is then discharged from the top, thereby improving the exhaust gas treatment efficiency.

[0006] This utility model is implemented as follows: a boiler exhaust gas treatment device for thermal power plants includes a honeycomb catalytic denitrification section, a cyclone spray desulfurization section and a cyclone dust collector arranged sequentially from top to bottom. The honeycomb catalytic denitrification section, the cyclone spray desulfurization section and the cyclone dust collector are connected by a variable diameter connecting pipe with a flange to form a continuous airflow channel.

[0007] The honeycomb catalytic denitrification section includes a pull-out drawer filled with a vanadium-tungsten-titanium honeycomb catalyst and connected to an outlet pipe at the top of the honeycomb catalytic denitrification section.

[0008] The swirl spray desulfurization section includes two corrugated diverter plates with opposite inclination directions, an annular spray pipe located above the diverter plates, and multiple vortex nozzles evenly distributed at the bottom of the pipe.

[0009] The cyclone dust collector includes a bottom conical ash hopper, a rotary ash discharge valve with a sealing structure, and an air inlet pipe.

[0010] In a preferred embodiment of the boiler exhaust gas treatment device for thermal power plants according to this utility model, both the left and right sides of the drawer are slidably connected to the sliding grooves opened on the inner wall of the honeycomb catalytic denitrification section via sliders.

[0011] As a preferred embodiment of the boiler exhaust gas treatment device for thermal power plants according to this utility model, the cyclone spray desulfurization section is provided with a lime slurry inlet pipe connected to the spray pipe on its exterior, and the outer wall of the cyclone spray desulfurization section is connected to a drain pipe.

[0012] As a preferred embodiment of the boiler exhaust gas treatment device for thermal power plants according to this utility model, the surface of the corrugated diversion plate is provided with silicone rubber scrapers connected by magnetic snap-fit.

[0013] As a preferred embodiment of the boiler exhaust gas treatment device for thermal power plants according to this utility model, the outer walls of the honeycomb catalytic denitrification section, the cyclone spray desulfurization section, and the cyclone dust collector are provided with fixing frames.

[0014] As a preferred embodiment of the boiler exhaust gas treatment device for thermal power plants according to this utility model, the exhaust pipe is embedded with an ammonia injection branch pipe.

[0015] The beneficial effects of this utility model are:

[0016] High-temperature exhaust gas enters a cyclone dust collector for primary dust removal, then rises to the cyclone spray desulfurization section to react with the reverse atomized lime slurry in a vortex, then passes through a demister and enters the honeycomb catalytic denitrification section to react with the injected ammonia gas under the action of a catalyst, and finally the purified gas is discharged through the top, thereby improving the exhaust gas treatment efficiency. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1This is a front sectional view of a boiler exhaust gas treatment device for thermal power plants according to the present invention.

[0019] Figure 2 This is a structural diagram of the spray pipe of this utility model.

[0020] Figure 3 This is a structural diagram of the honeycomb catalytic denitrification section of this utility model.

[0021] The markings in the diagram are: 1. Fixed frame; 2. Cyclone dust collector; 201. Ash hopper; 202. Air inlet pipe; 3. Cyclone spray desulfurization section; 301. Spray pipe; 302. Vortex nozzle; 303. Diverter plate; 304. Liquid inlet pipe; 305. Liquid outlet pipe; 4. Honeycomb catalytic denitrification section; 401. Drawer; 402. Honeycomb catalyst; 403. Air outlet pipe. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-3 A boiler exhaust gas treatment device for thermal power plants includes a honeycomb catalytic denitrification section 4, a cyclone spray desulfurization section 3, and a cyclone dust collector 2 arranged sequentially from top to bottom. A variable diameter connecting pipe connected by a flange between the honeycomb catalytic denitrification section 4, the cyclone spray desulfurization section 3, and the cyclone dust collector 2 forms a continuous airflow channel.

[0024] The honeycomb catalytic denitrification section 4 includes a pull-out drawer 401, which is filled with a vanadium-tungsten-titanium honeycomb catalyst 402 and connected to an outlet pipe 403 at the top of the honeycomb catalytic denitrification section 4.

[0025] The swirl spray desulfurization section 3 includes two corrugated diverter plates 303 with opposite inclination directions, an annular spray pipe 301 located above the diverter plate 303, and multiple vortex nozzles 302 evenly distributed at its bottom.

[0026] The cyclone dust collector 2 includes a bottom conical ash hopper 201, a rotary ash discharge valve with a sealing structure, and an air inlet pipe 202.

[0027] In this embodiment: the exhaust gas is drawn into the cyclone dust collector 2 through the inlet pipe 202 by the fan, rotates downward along the cylinder, and the rotational inertia generates centrifugal force. When it reaches the bottom, the particulate matter in the gas is separated, and the dust falls into the ash hopper 201 through the discharge valve. The filtered gas rotates upward due to the cylinder structure and enters the cyclone spray desulfurization section 3 through the connecting pipe, thereby completing the primary dust removal of the exhaust gas and reducing the risk of dust clogging the catalyst.

[0028] The lime slurry enters the spray pipe 301 and is sprayed through the vortex nozzle 302. The exhaust gas after primary dust removal is evenly dispersed by the lower diversion plate 303 and reacts with the lime slurry in the opposite direction. The combination of spraying with two sets of spray pipes 301 and two sets of corrugated diversion plates 303 with opposite inclination directions can further improve the desulfurization effect on the exhaust gas.

[0029] The exhaust gas desulfurized by the cyclone spray desulfurization section 3 is demisted by the demister at the top of the cyclone spray desulfurization section 3, and then enters the honeycomb catalytic denitrification section 4 through the connecting pipe. At the same time, ammonia is injected into the honeycomb catalytic denitrification section 4. Under the action of the vanadium tungsten titanium honeycomb catalyst 402, the exhaust gas is denitrified. The treated exhaust gas is discharged from the outlet pipe 403.

[0030] High-temperature exhaust gas enters the cyclone dust collector 2 for primary dust removal → rises to the cyclone spray desulfurization section 3 and reacts with the reverse atomized lime slurry in a vortex → after passing through the demister, it enters the honeycomb catalytic denitrification section 4 and reacts with the injected ammonia gas under the action of the catalyst → the purified gas is discharged through the top, thereby improving the exhaust gas treatment efficiency.

[0031] As a technical optimization of this utility model, both the left and right sides of drawer 401 are slidably connected to the sliding grooves opened on the inner wall of the honeycomb catalytic denitrification section 4 by sliders.

[0032] In this embodiment: the drawer 401 can be removed from the honeycomb catalytic denitrification section 4 by the cooperation of the slider and the groove, and the vanadium-tungsten-titanium honeycomb catalyst 402 inside can be replaced.

[0033] As a technical optimization of this utility model, the outside of the cyclone spray desulfurization section 3 is provided with a lime slurry inlet pipe 304 that is connected to the spray pipe 301, and the outer wall of the cyclone spray desulfurization section 3 is connected with a drain pipe 305.

[0034] In this embodiment: lime slurry can be introduced into the spray pipe 301 through the liquid inlet pipe 304, thereby spraying and desulfurizing the waste gas, and the liquid in the cyclone spray desulfurization section 3 can be discharged through the liquid outlet pipe 305.

[0035] As a technical optimization of this utility model, the surface of the corrugated diverter plate 303 is provided with a silicone rubber scraper connected by a magnetic snap.

[0036] In this embodiment, the diverter plate 303 can be cleaned using a silicone rubber scraper.

[0037] As a technical optimization of this utility model, the outer walls of the honeycomb catalytic denitrification section 4, the cyclone spray desulfurization section 3, and the cyclone dust collector 2 are provided with a fixing frame 1.

[0038] In this embodiment, the honeycomb catalytic denitrification section 4, the cyclone spray desulfurization section 3, and the cyclone dust collector 2 can be supported by the fixing frame 1.

[0039] As a technical optimization of this utility model, the gas outlet pipe 403 is embedded with an ammonia injection branch pipe.

[0040] In this embodiment, ammonia gas is injected into the honeycomb catalytic denitrification section 4 via an ammonia injection branch pipe for reaction.

[0041] The working principle and usage process of this utility model are as follows: the exhaust gas is drawn into the cyclone dust collector 2 through the inlet pipe 202 by the fan, and rotates downward along the cylinder. The rotational inertia generates centrifugal force, which separates the particulate matter in the gas when it reaches the bottom. The dust falls into the ash hopper 201 through the discharge valve. The filtered gas rotates upward due to the cylinder structure and enters the cyclone spray desulfurization section 3 through the connecting pipe, thereby completing the primary dust removal of the exhaust gas and reducing the risk of dust clogging the catalyst.

[0042] The lime slurry enters the spray pipe 301 through the inlet pipe 304 and is sprayed through the vortex nozzle 302. The exhaust gas after primary dust removal is evenly dispersed by the lower diversion plate 303 and reacts with the lime slurry in the opposite direction. The combination of spraying through two sets of spray pipes 301 and two sets of corrugated diversion plates 303 with opposite inclination directions can further improve the desulfurization effect on the exhaust gas.

[0043] The exhaust gas desulfurized by the cyclone spray desulfurization section 3 is demisted by the demister at the top of the cyclone spray desulfurization section 3, and then enters the honeycomb catalytic denitrification section 4 through the connecting pipe. At the same time, ammonia is injected into the honeycomb catalytic denitrification section 4. Under the action of the vanadium tungsten titanium honeycomb catalyst 402, the gas reacts to denitrify the exhaust gas. The treated exhaust gas is discharged from the outlet pipe 403.

[0044] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A boiler exhaust gas treatment device for thermal power plants, characterized by: It includes a honeycomb catalytic denitrification section (4), a cyclone spray desulfurization section (3) and a cyclone dust collector (2) arranged sequentially from top to bottom. The honeycomb catalytic denitrification section (4), the cyclone spray desulfurization section (3) and the cyclone dust collector (2) are connected by a variable diameter connecting pipe with a flange to form a continuous airflow channel. The honeycomb catalytic denitrification section (4) includes a pull-out drawer (401) filled with a vanadium-tungsten-titanium honeycomb catalyst (402) and connected to an outlet pipe (403) at the top of the honeycomb catalytic denitrification section (4). The swirl spray desulfurization section (3) includes two corrugated diverter plates (303) with opposite inclination directions, an annular spray pipe (301) located above the diverter plate (303), and multiple vortex nozzles (302) evenly distributed at its bottom. The cyclone dust collector (2) includes a bottom conical ash hopper (201), a rotary ash discharge valve with a sealing structure, and an air inlet pipe (202).

2. A boiler exhaust gas treatment device for thermal power plants according to claim 1, characterized in that: The left and right sides of the drawer (401) are slidably connected to the grooves opened on the inner wall of the honeycomb catalytic denitrification section (4) by sliders.

3. A boiler flue gas treatment device for thermal power plants according to claim 1, characterized in that: The swirl spray desulfurization section (3) is provided with a lime slurry inlet pipe (304) connected to the spray pipe (301) on the outside, and a drain pipe (305) is connected to the outer wall of the swirl spray desulfurization section (3).

4. The boiler exhaust gas treatment device for thermal power plants according to claim 1, characterized in that: The surface of the corrugated diverter plate (303) is provided with a silicone rubber scraper connected by a magnetic snap.

5. A boiler flue gas treatment device for thermal power plants according to claim 1, characterized in that: The outer walls of the honeycomb catalytic denitrification section (4), the cyclone spray desulfurization section (3), and the cyclone dust collector (2) are provided with fixing frames (1).

6. A boiler flue gas treatment device for thermal power plants according to claim 1, characterized in that: The outlet pipe (403) is embedded with an ammonia injection branch pipe.

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