CN203971653U - A kind of gas-liquid reallocation and subparticle capturing device that is applicable to single tower double circulation desulphurization tower - Google Patents

Abstract

A kind of gas-liquid reallocation and subparticle capturing device that is applicable to single tower double circulation desulphurization tower, by tower body, spray equipment, catch tray, Venturi tube, downspout, formed, it is characterized in that, spray equipment is arranged on tower body internal upper part, catch tray is arranged at middle part in tower body, least significant end at catch tray arranges downspout, and downspout causes outside tower and is connected with tower outer circulation case, and the percent opening of the corresponding catch tray of quantity of Venturi tube is arranged on catch tray.Advantage is, realizes single tower double-cycle process cyclic process liquid collection, gas distributes again, utilizes venturi principle, wet dust removal principle simultaneously, promotes subparticle cohesion in flue gas, removes subparticle in flue gas.

Description

A gas-liquid redistribution and fine particle capture device suitable for single-tower double-cycle desulfurization towers

technical field

The utility model belongs to a gas-liquid redistribution and fine particle trapping device in a single-tower double-circulation absorption tower used in limestone (lime)/gypsum method, magnesium oxide method and ammonia/ammonium sulfate method flue gas desulfurization technology. In particular, it relates to a device for gas-liquid redistribution in the absorption tower to realize the liquid collection in the single-tower double-circulation process. The coagulation and capture device can effectively reduce the emission of flue gas dust particles.

Background technique

At present, the emission standards of air pollutants are becoming increasingly strict. According to the requirements of GB13223-2011 on the emission standards of flue gas pollutants in thermal power plants, the S02 emission standard at the flue gas outlet of the desulfurization tower is strict from 200mg/m3 to 50mg/m3, and the dust emission standard is from 100mg/m3 m3 is strictly to 50mg/m3 (30mg/m3 is required in special areas). Using conventional desulfurization processes, such as limestone (lime)/gypsum method, magnesium oxide method, ammonia/ammonium sulfate method, it is difficult to achieve stable standards. The effective process improvement at this stage is to improve the original absorption tower on the basis of the original desulfurization process, and adopt a single-tower double-cycle process to improve the desulfurization efficiency. At the same time, a special device is added in the absorption tower or after the outlet of the absorption tower to remove fine particles in the flue gas to meet the emission requirements.

At present, the gas-liquid redistribution device used in the absorption tower using the single-tower double-circulation process, or similar devices have been used, with different names and different forms, each with its own advantages and disadvantages.

Chinese patent (Application No.: 201320018834.6) discloses a semi-pipe type roof ridge defogging liquid contact rectification device. The device adopts a roof-like structure composed of two layers of half-pipes that are staggered, which can reduce the smoke resistance and facilitate cleaning, but it cannot completely block the liquid in the upper spray layer.

Chinese patent (application number: 201210341840.5) discloses a desulfurization system for efficiently capturing aerosols in clean flue gas after desulfurization. The high-efficiency aerosol trap installed between the upper part of the slurry spray layer in the desulfurization tower and the lower part of the demister is composed of a multi-layer louver structure.

Chinese patent (Application No.: 201210287870.2) discloses a high-efficiency wet electrostatic precipitator and desulfurization system and process, wherein the surface of the water accumulation tray is distributed with protrusions, and the top of the protrusions has a flue gas through hole, and the water accumulation tray passes through the water collecting The piping system communicates with the circulating water tank. This kind of water accumulation tray is easy to cause dust accumulation in the tray and is inconvenient to clean.

Chinese patent (application number: 201210258750.X) discloses a multi-funnel slurry collection tray for a desulfurization absorption tower in a truncated conical spray zone. A cone with a large upper opening and a smaller lower opening is arranged under the spray layer, and a slurry collecting tray is arranged under the cone. The disc body is also easy to accumulate dust, and the conical lower opening is small and the upper opening is large, which limits the opening ratio of the disc body.

Chinese patent (Application No.: 201010210119.3) discloses a flue gas desulfurization device for boilers with crystalline ammonia method in a tower. A group of gas caps, gas cap cleaning nozzles, and a conical air flow ring are arranged in the center of the tower. The combination blocks the direction of airflow from bottom to top in the tower and increases the resistance of flue gas.

The absorption tower and gas-liquid redistribution device used in the single-tower double-circulation process must ensure high removal efficiency of fine particles, reduce the flue gas resistance as much as possible, and meet the large opening ratio on the cross-section of the tower. range of change,

Contents of the invention

The purpose of this utility model is to design and manufacture a device for gas-liquid redistribution and fine particle capture in the absorption tower used in the single-tower double-cycle desulfurization process, and to promote the dissolution and oxidation treatment device for insoluble particulate matter. A device that realizes liquid collection and gas redistribution during the single-tower double-circulation process, and uses the Venturi principle and wet dust removal principle to promote the aggregation of fine particles in the flue gas and remove fine particles in the flue gas.

The technical scheme of the utility model is a gas-liquid redistribution and fine particle capture device suitable for a single-tower double-circulation desulfurization tower, which is composed of a tower body, a spray device, a liquid collection tray, a venturi tube, and a downcomer , the spraying device is set in the upper part of the tower body, the liquid collecting tray is set in the middle of the tower body, and the downcomer is arranged at the lowest end of the liquid collecting tray, and the downcomer is led to the outside of the tower and connected with the external circulation box of the tower. The number of Venturi tubes The opening ratio corresponding to the liquid collecting pan is set on the liquid collecting pan.

The spraying device includes nozzles and spray pipes. The nozzles are set directly above the Venturi tube and the liquid storage pipe, and the vertical distance between the nozzle and the liquid storage pipe is kept at 0.5m-2m. The layout position and quantity correspond to the Venturi tube. The nozzles are connected through the spray pipe, which is connected with the spray pump and the corresponding pipeline outside the tower.

The liquid collecting tray is a cone with a large upper part and a smaller lower part. The angle between the generatrix of the cone and the horizontal plane is 30°-45°. It is set according to the applicable working conditions. The horizontal projected area opening ratio of the liquid collecting tray is 30%-60 %.

The downcomer is connected to the lowest end of the liquid collecting pan, supplemented by pipe elbows and horizontal pipes to lead the liquid in the liquid collecting pan to the outside of the tower, and the horizontal pipe is set with a slope of 5° to prevent solid deposition in the pipe.

All the Venturi tubes arranged on the liquid collecting pan have the same size, and the reducing tubes are short and the diffusers are long. The lower end of the throat of the Venturi tube is connected to the liquid collection pan, and the upper end of the diffuser tube of the Venturi tube is connected to liquid storage tubes of different lengths to keep all venturi tube outlets at the same level. The liquid storage pipe is higher than the bottom of the cone of the liquid collection tray by a certain distance, and the distance is 0.5-2 times the height of the cone.

When dealing with high-dust-laden fumes, in order to meet the device’s requirements for the removal of fine particles, a lower spray device can be installed within a distance of 0.5m-2m directly below the Venturi tube.

The device is made of corrosion-resistant materials, and the throat of the Venturi tube is made of corrosion-resistant and wear-resistant materials.

The utility model has the advantages that: it can be applied to the collection and purification of fine particles of high dust-containing flue gas, and through the agglomeration of the Venturi on the fine particles, the particle size of the fine particles is increased, and the purification efficiency of the upper spray device is improved; When dealing with flue gas with a particularly high content of fine particles, the lower spray device can enhance the removal effect of fine particles. At the same time, the flexible adjustment of the length of the liquid storage tube above the Venturi expander can meet the requirements of different liquid storage volumes of the liquid collection tray. In addition, the liquid collecting pan has a specific angle, which is conducive to the flow of flue gas and is more conducive to the liquid in the pan to wash away the possible deposits on the bottom of the pan to avoid dust accumulation on the bottom of the pan. More importantly, the opening ratio of the liquid collecting tray can be adjusted flexibly, and the flue gas resistance can be adjusted to the minimum according to different working conditions, while ensuring a good effect of gas-liquid redistribution; it is suitable for gas-liquid redistribution and Fine particle capture.

Description of drawings:

Below in conjunction with accompanying drawing and embodiment, the utility model is further described.

Figure 1 is a structural schematic diagram of a gas-liquid redistribution and fine particle capture device suitable for a single-tower double-cycle desulfurization tower of the present invention

In the figure, 1-1-spray pipe, 1-2-nozzle, 2-collection tray, 3-downcomer, 4-tower body, 5-venturi tube, 5-1-venturi tube reduction tube, 5-2-Venturi tube throat, 5-3-Venturi expander, 6-storage tube

Detailed ways:

As can be seen from Figure 1, the utility model is a gas-liquid redistribution and fine particle capture device suitable for single-tower double-cycle desulfurization towers. , spray device 1, and installed in the tower 4.

The device takes the liquid collecting tray 2 as the main structure, and the liquid collecting tray 2 is placed in a suitable position (determined by the process) in the double-circulation absorption tower. The downcomer 3 and the Venturi tube 5 are installed on the liquid collecting pan 2, and the liquid on the upper part of the liquid collecting pan is collected and discharged out of the tower through the downcomer, and the gas in the lower part of the liquid collecting pan is guided into the upper part of the liquid collecting pan by the Venturi tube , to achieve gas-liquid redistribution.

Venturi tube 5 is composed of throat 5-1, reducer 5-2 and expander 5-3. The arrangement form of the Venturi tube 5 on the liquid collecting pan and the opening ratio of the liquid collecting pan 5 are designed according to the actual working conditions. The size of the Venturi tube 5 is designed according to the opening ratio.

The spray device 1 is composed of a spray pipe 1-1 and a nozzle 1-2, the nozzle 1-2 is directly above the Venturi tube 5, and the liquid storage pipe 6 is connected with the expander 5-3 of the Venturi tube.

Working principle and using method of the present utility model are:

The flue gas containing liquid droplets and ash flows through the device from the lower direction of the absorption tower. When the flue gas passes through several Venturi tubes, the liquid droplets and ash in the flue gas flow at high speed, and the fine particles coagulate, and the ash particles diameter increases. As the flue gas exits the venturi, the flue gas comes into contact with the spray liquid directly above the venturi. The spray liquid is atomized by the nozzle to form fine droplets to further wash the ash.

The spray liquid in the absorption tower flows through the device from top to bottom. When the spray liquid finishes washing the flue gas, it falls into the liquid collecting pan and is led out of the tower through the downcomer.

Claims (6)

1. A gas-liquid redistribution and fine particle capture device suitable for a single-tower double-circulation desulfurization tower, consisting of a tower body, a spray device, a liquid collection tray, a Venturi tube, and a downcomer. It is characterized in that the spray The shower device is arranged in the upper part of the tower body, the liquid collecting tray is arranged in the middle of the tower body, and the downcomer is arranged at the lowest end of the liquid collecting tray, and the downcomer is led to the outside of the tower and connected with the circulation box outside the tower, and the number of Venturi tubes corresponds to the set The opening ratio of the liquid pan is set on the liquid collecting pan. the 2. A gas-liquid redistribution and fine particle capture device suitable for single-tower double-cycle desulfurization towers as claimed in claim 1, characterized in that the spray device includes nozzles and spray pipes, and the nozzles are arranged in the Venturi Directly above the pipe and the liquid storage pipe, the vertical distance between the liquid storage pipe and the liquid storage pipe is kept at 0.5m-2m. The layout position and quantity correspond to the Venturi tube. The sprinkler pump and the corresponding pipeline are connected. the 3. A gas-liquid redistribution and fine particle capture device suitable for single-tower double-circulation desulfurization towers as claimed in claim 1, characterized in that the liquid collection tray is a cone with a large upper part and a smaller lower part, and the cone busbar The included angle with the horizontal plane is 30°-45°, and it is set according to the applicable working conditions. The opening ratio of the horizontal projected area of the liquid collecting pan is 30%-60%. the 4. A gas-liquid redistribution and fine particle capture device suitable for single-tower double-circulation desulfurization towers as claimed in claim 1, characterized in that the downcomer is connected to the lowest end of the liquid collection tray, supplemented by pipelines Elbows and horizontal pipes lead the liquid in the liquid collection tray to the outside of the tower, and the horizontal pipes are set with a slope of 5° to prevent solid deposition in the pipes. the 5. A gas-liquid redistribution and fine particle capture device suitable for single-tower double-circulation desulfurization towers as claimed in claim 1, characterized in that all the Venturi tubes arranged on the liquid collection tray have the same size, The reduction tube is short and the diffusion section is long. The lower end of the throat of the Venturi tube is connected to the liquid collection plate, and the upper end of the diffuser tube of the Venturi tube is connected to liquid storage tubes of different lengths to keep all venturi tube outlets at the same level. The liquid pipe is higher than the bottom of the cone of the liquid collection tray by a certain distance, which is 0.5-2 times the height of the cone. the 6. A gas-liquid redistribution and fine particle capture device suitable for single-tower double-circulation desulfurization towers as claimed in claim 1, characterized in that, when dealing with high dust-laden flue gas, the Venturi tube Install the lower sprinkler device within the range of 0.5m-2m below. the