CN205127560U - Coal fired power plant wet chimney defogging dust collector - Google Patents

Abstract

The utility model discloses a fog removal and dust removal device for a wet chimney of a coal-fired power plant. It consists of a group of concentric blades, fixed on the lower support structure by bolts, and the lower support structure is fixed under the connecting rod by bolts; the vortex demister is above the vortex distributor, and is fixed under the upper support structure by bolts; the vortex demister It is also composed of a group of concentric blades, the arrangement of the blades is opposite to that of the vortex distributor, so the direction of the airflow swirl flow formed by it is also opposite; the connecting rod is fixed under the upper support structure by bolts, and the upper support structure is fixed by a detachable fixing device At the top of the inner wall of the chimney. The beneficial effects of the utility model are: high demisting efficiency, small running resistance, small blocking effect on flue gas, small running resistance, and low energy consumption. Easy installation, simple operation and maintenance.

Description

Fog and dust removal device for wet chimney of coal-fired power plant

technical field

The utility model belongs to a fog and dust removal device, in particular to a fog and dust removal device for a wet chimney of a coal-fired power plant.

Background technique

At present, more than 90% of the flue gas desulfurization devices of domestic large-scale coal-fired power plants adopt the limestone-gypsum wet desulfurization process, and the wet flue gas after desulfurization contains strong acidic substances such as SO ₂ , SO ₃ , and HCl. After desulfurization, the flue gas temperature is below the acid dew point, and the chimney at this time is called a "wet chimney". The flue gas in the wet chimney tends to produce corrosive sulfuric acid, sulfurous acid and hydrochloric acid. For a desulfurization system without a flue gas heat exchanger, the temperature of the flue gas is lower, and the condensed acid liquid in the flue gas is taken out of the chimney in the form of small mist with the flue gas discharge, and is scattered in the surrounding environment, which is harmful to the health and property safety of nearby residents. pose a serious threat.

At present, the chimneys of large coal-fired power plants have large diameters and high heights. The traditional demisting devices are not only difficult to install, but also very troublesome to operate and maintain, and consume high energy consumption. In order to effectively remove the mist in the wet chimney, we have designed and developed a double vortex type chimney demist and dust removal device.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a device with reasonable structure and good purification effect for wet chimneys of coal-fired power plants.

This coal-fired power plant wet chimney fog and dust removal device includes a gravity hammer, a lower support structure, a vortex distributor, a connecting rod, a vortex demister, an upper support structure and a nozzle from bottom to top; the vortex distributor consists of a set of concentric The blades are fixed on the lower support structure by bolts, and the lower support structure is fixed under the connecting rod by bolts; the vortex demister is above the vortex distributor, and is fixed under the upper support structure by bolts; the vortex demister is also composed of a set of concentric The vane arrangement is opposite to that of the vortex distributor, so the swirling direction of the airflow formed by it is also opposite; the connecting rod is fixed under the upper support structure by bolts, and the upper support structure is fixed on the top of the inner wall of the chimney by a detachable fixing device.

As a preference: the inner diameter of the chimney is D; the vortex distributor is below the inlet end of the wet electrostatic precipitator, and the distance between its upper end and the vortex distributor is L; the gas flow rate in the chimney ranges from 10m/s to 25m/s, and the value range of L1 The vortex distributor is composed of a central cylinder, an outer cylinder and blades; the cross section of the outer cylinder is circular, the diameter is dw, and the range of dw is 2/3D to 9/10D; the angle between the blade plane and the horizontal plane is s, The angle between the upper end of the blade and the horizontal plane is r; the range of s is 30°-50°, the range of r is 0°-30°; the number of blades is 9-36.

As a preference: the vortex demister is located at the outlet end of the chimney, and is composed of a central cylinder, an outer cylinder and blades; the diameter of the outer cylinder is dc, and the value of dc generally ranges from 4/5D to 9/10D; the angle between the blade plane and the horizontal plane It is s, and the angle between the lower end of the blade and the horizontal plane is r; generally, the range of s is -30°～-50°, and the range of r is 0°～-30°; the number of blades is 9～36.

As a preference: the material of the vortex distributor and the vortex demister is acid-resistant non-metal, acid-resistant stainless steel or carbon steel lined with anti-corrosion coating.

As a preference: the material of the lower support structure, upper support structure, connecting rod, gravity hammer and bolts should be acid-resistant stainless steel.

As a preference: the nozzle is arranged above the upper support structure and the vortex demister, and is a solid cone nozzle.

As a preference: the upper support structure is fixed on the outer wall of the chimney, and no supporting point is provided on the inner wall of the chimney.

As a preference: the periphery of the lower supporting structure is tightly pressed against the inner wall of the chimney through a corrosion-resistant soft connection.

The beneficial effects of the utility model are:

1 High defogging efficiency and low running resistance

This demister device adopts the method of two-stage flue gas swirl to remove mist droplets. The first stage uses centrifugal force to remove large-size mist droplets, and the second stage uses the collision effect of changing the direction of air flow to remove small-size mist droplets. The mist droplets of various particle sizes in the air have good removal effect. Due to the use of the airflow rotation, compared with the traditional collision defogging device, it has less blocking effect on the flue gas, less running resistance and lower energy consumption.

2 Easy installation, simple operation and maintenance

The upper support structure is fixed outside the chimney, and the lower support structure is in contact with the inner wall of the chimney through a corrosion-resistant soft connection. There is no need to add support points in the chimney, and the installation is very convenient. The whole device can be disassembled into several independent parts, and then transported to the top of the chimney for on-site assembly without using fire, which reduces the workload and difficulty of high-altitude operations. The device is installed on the top of the chimney, and the operating personnel can repair and maintain the equipment without entering the inside of the chimney.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of a vortex distributor;

Fig. 3 is the vane angle schematic diagram of vortex distributor;

Fig. 4 is the schematic diagram of the structure of the vortex demister;

Figure 5 is a schematic diagram of the blade angle of the vortex demister;

Explanation of reference numerals: gravity hammer 1, lower support structure 2, vortex distributor 3, connecting rod 4, vortex demister 5, upper support structure 6, nozzle 7, chimney inner wall 8, central cylinder 9, outer cylinder 10, blades 11.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further. Although the utility model will be described in conjunction with preferred embodiments, it should be understood that it does not mean that the utility model is limited to the embodiments. On the contrary, the invention is to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.

As shown in Fig. 1 to Fig. 2, this wet chimney demist and dedusting device of a coal-fired power plant includes a gravity hammer 1, a lower support structure 2, a vortex distributor 3, a connecting rod 4, a vortex demister 5, The upper support structure 6 and the nozzle 7; the vortex distributor 3 is composed of a group of concentric blades 11, which are fixed on the lower support structure 2 by bolts, and the lower support structure 2 is fixed under the connecting rod 4 by bolts; the vortex demister 5 is in the vortex Above the distributor 3, it is fixed under the upper supporting structure 6 by bolts; the vortex demister 5 is also composed of a set of concentric blades 11, and the arrangement of the blades 11 is opposite to that of the vortex distributor 3, so that the swirl direction of the air flow formed by it is Also opposite; the connecting rod 4 is fixed under the upper support structure 6 by bolts, and the upper support structure 6 is fixed on the top of the chimney inner wall 8 by a detachable fixing device.

When the flue gas containing liquid droplets passes through the vortex distributor 3, under the action of the blade 11, a swirl movement around the center is generated, and some large-sized droplets move around under the action of centrifugal force, collide with the inner wall 8 of the chimney, and condense Finally, condensate is formed, and the condensate flows to the bottom of the chimney along the inner wall 8 of the chimney under the action of gravity. Due to the small mass of the small particle size droplets, as the flue gas continues to move upward, when passing through the upper vortex demister 5, the airflow direction is reversed, and the small particle size droplets are in contact with the vortex demister 5 under the action of inertia. The blades 11 collide, aggregate and condense into large-size droplets and be removed

The inner diameter of the chimney is D; the vortex distributor 3 is located below the inlet end of the wet electrostatic precipitator, and the distance between its upper end and the vortex distributor 3 is L1; the gas flow rate in the chimney ranges from 10m/s to 25m/s, and the value range of L1 is 1 to 3m; as shown in Figure 2, the vortex distributor 3 is composed of a central cylinder 9, an outer cylinder 10 and blades 11; the outer cylinder 10 has a circular cross section with a diameter of dw, and the range of dw is 2/3D to 9/10D; Fig. 3, the angle between the blade 11 plane and the horizontal plane is s, the angle between the upper end of the blade 11 and the horizontal plane is r; the range of s is 30°～50°, the range of r is 0°～30°; the number of blades 11 is 9～36 .

The vortex demister 5 is located at the outlet end of the chimney, as shown in Figure 4, and is composed of a central cylinder 9, an outer cylinder 10 and a vane 11; the diameter of the outer cylinder 10 is dc, and the value of the general dc ranges from 4/5D to 9/ 10D; as shown in Figure 5, the angle between the plane of the blade 11 and the horizontal plane is s, and the angle between the lower end of the blade 11 and the horizontal plane is r; generally, the range of s is -30°～-50°, and the range of r is 0°～-30° °; The number of blades 11 is 9-36.

The number of vanes 11 of the vortex distributor 3 and the vortex demister 5 may be different, and the angles s and r of the vanes 11 may be different. The material of the vortex distributor 3 and the vortex eliminator 5 is acid-resistant non-metal, acid-resistant stainless steel or carbon steel lined with anti-corrosion coating. The material of the lower support structure 2, upper support structure 6, connecting rod 4, gravity hammer 1 and bolts should be acid-resistant stainless steel.

The nozzle 7 is arranged above the upper support structure 6 and the vortex demister 5 and is a solid cone nozzle 7 . One or more nozzles may be used. The flushing water is sprayed through the nozzles to flush away the condensed acid droplets on the blades of the vortex demister below.

The upper supporting structure 6 is fixed on the outer wall of the chimney, and no supporting point is provided on the inner wall 8 of the chimney. The surroundings of the lower support structure 2 are tightly connected to the inner wall 8 of the chimney through a corrosion-resistant soft connection, so as not to damage the anti-corrosion layer in the chimney, but also to ensure that the lower support structure 2 and the vortex distributor 3 do not shake in the chimney.

Claims (8)

1. A coal-fired power plant wet chimney fog and dust removal device, characterized in that: from bottom to top, it includes a gravity hammer (1), a lower support structure (2), a vortex distributor (3), a connecting rod (4), a vortex Mist eliminator (5), upper support structure (6) and nozzle (7); vortex distributor (3) consists of a set of concentric blades (11), fixed on the lower support structure (2) by bolts, the lower support structure (2) is fixed under the connecting rod (4) by bolts; the vortex demister (5) is above the vortex distributor (3), and is fixed under the upper support structure (6) by bolts; the vortex demister (5) is also Consists of a group of concentric blades (11), the arrangement of the blades (11) is opposite to that of the vortex distributor (3), so the direction of the air swirl flow formed by it is also opposite; the connecting rod (4) is fixed to the upper support structure by bolts (6) The lower and upper supporting structures (6) are fixed on the top of the chimney inner wall (8) by detachable fixing devices. 2. coal-fired power plant wet chimney mist removal and dedusting device according to claim 1, is characterized in that: described chimney internal diameter is D; Vortex distributor (3) is below the entrance end of wet electrostatic precipitator, and its upper end is apart from vortex distributor The distance of (3) is L1; The range of gas velocity in the chimney is 10m/s～25m/s, and the range of L1 is 1～3m; The vane (11) is formed; the cross section of the outer cylinder (10) is circular, the diameter is dw, and the value range of dw is 2/3D to 9/10D; the angle between the plane of the vane (11) and the horizontal plane is s, and the upper end of the vane (11) and The included angle of the horizontal plane is r; the range of s is 30°-50°, and the range of r is 0°-30°; the number of blades 11 is 9-36. 3. The wet chimney demisting and dedusting device of coal-fired power plant according to claim 1, characterized in that: the vortex demister (5) is located at the outlet end of the chimney, and consists of a central cylinder (9), an outer cylinder (10) and the blade (11); the diameter of the outer cylinder (10) is dc, and the value range of dc is 4/5D to 9/10D; the angle between the plane of the blade (11) and the horizontal plane is s, and the angle between the lower end of the blade (11) and the horizontal plane is r; the range of s is -30° to -50°, the range of r is 0° to -30°; the number of blades (11) is 9 to 36. 4. The wet chimney demisting and dedusting device of coal-fired power plant according to claim 1, characterized in that: the material of the eddy current distributor (3) and the eddy current demister (5) is acid-resistant non-metal, acid-resistant stainless steel or carbon Steel lining with anti-corrosion coating. 5. The wet chimney demisting and dedusting device of a coal-fired power plant according to claim 1, characterized in that: the lower support structure (2), the upper support structure (6), the connecting rod (4), the gravity hammer (1) And bolt material should be acid-resistant stainless steel. 6. The wet chimney demist and dedusting device of a coal-fired power plant according to claim 1, characterized in that: the nozzle (7) is arranged above the upper support structure (6) and the vortex demister (5), and is a solid cone nozzle (7). 7. The fog removal and dust removal device for a wet chimney of a coal-fired power plant according to claim 1, characterized in that: the upper support structure (6) is fixed on the outer wall of the chimney, and no support point is provided on the inner wall (8) of the chimney. 8. The fog removal and dust removal device for a wet chimney of a coal-fired power plant according to claim 1, characterized in that: the surrounding of the lower support structure (2) is tightly connected to the inner wall (8) of the chimney through a corrosion-resistant soft connection.