CN202860367U - Air distribution device of activated coke flue gas adsorption tower - Google Patents

Abstract

The airflow distribution device of the activated coke flue gas adsorption tower includes several rows of activated coke adsorption layers. An unloader is installed, and an airflow distribution plate on the windward end surface is installed outside the active coke adsorption layer of the first column, that is, the active coke adsorption layer on the windward end surface. An intermediate airflow distribution plate is installed between each column of active coke adsorption layers. In the vertical section, the panel adopts a large opening ratio in the upper part and a smaller opening ratio in the lower part. The active coke of the utility model is divided into multiple rows by the air distribution plate, and the saturated and unsaturated active coke adopt different moving speeds, so that the discharge volume and circulation of the active coke are small; through the optimization effect of the air distribution plate on the air flow, The flue gas and activated coke move in a combination of cross-flow and convection, which makes the airflow distribution in the purification device match the adsorption capacity of the active coke, the system has high purification efficiency, and the flue gas resistance is small.

Description

Airflow distribution device of activated coke flue gas adsorption tower

technical field

The utility model relates to equipment for purifying and treating flue gas pollutants in an active coke dry method, in particular to an air distribution device for an active coke flue gas adsorption tower.

Background technique

Activated coke flue gas purification technology can simultaneously remove various pollutants SO ₂ , SO ₃ , NOx, HCl, HF, dust, heavy metals, dioxins, etc. Strict environmental protection standards; and it is a dry flue gas purification technology, the water consumption is only equivalent to 1/10 of wet desulfurization; there are no problems such as chimney anticorrosion, "gypsum rain" and clean flue gas droplet carrying in wet flue gas desulfurization ; The sulfur resources in the flue gas can also be recovered, and the by-products can be utilized as resources. Therefore, the performance index of activated coke flue gas purification technology is advanced and will be widely promoted and applied in our country.

The types of activated coke flue gas purification devices are generally divided into two types: cross flow type and convection type:

The cross-flow type means that the flue gas enters the flue gas purification device from the side, and passes through the active coke bed from left to right. The active coke moves slowly from top to bottom in the moving bed, and the flue gas and active coke flow in a wrong direction. The cross-flow flue gas purification device has a simple structure, a small equipment footprint, and a small system resistance. However, because the cross-flow flue gas purification device is fed from the side, the active coke on the side of the inlet reaches saturation first. If the material is discharged from the bottom at the same time, the active coke on the rear side of the bed will be discharged without being saturated, which increases the activity. Coke discharge and circulation. Moreover, in the cross-flow flue gas purification device, the active coke at the upper end is fresh active coke, while the active coke at the lower end is close to adsorption saturation. If the flue gas distribution is not optimized, the removal efficiency of pollutants at the lower end will be low , affecting the overall purification efficiency.

The convection type means that the flue gas enters the flue gas purification device from the bottom, passes through the active coke bed from bottom to top, and the active coke moves from top to bottom in the moving bed, and the flue gas and active coke flow in reverse. The convective flue gas purification device can overcome the problem of partially unsaturated activated coke discharged by the cross-flow method, and there is no problem of low purification efficiency at certain parts of the air intake section. However, the structure of the convective flue gas purification device is complicated. The active coke outlet and the flue gas inlet are all set at the bottom of the purification device, and the active coke feed port and the flue gas outlet are both set at the top of the purification device, and there are many active coke Slide pipe, equipment manufacturing and processing are difficult, the risk of device failure is high, and the equipment occupies a large area, and the system resistance is high.

At present, among the active coke flue gas purification devices used abroad, the cross-flow type is the main one, but the above problems of the cross-flow type have not been effectively solved.

Utility model content

The purpose of this utility model is to provide a kind of active coke discharge volume and circulation volume is small, flue gas and active coke are cross-flow and convection combined moving mode, make the airflow distribution in the purification device match the adsorption capacity of active coke , the airflow distribution device of the active coke flue gas adsorption tower with high purification efficiency and low flue gas resistance.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: comprising several rows of active coke adsorption layers installed between the air intake grill and the outlet grill, the upper and lower ends of each row of active coke adsorption layers are respectively connected with the feed The storage bin and the discharge bin are connected, and an unloader is installed at the lower end of each row of activated coke adsorption layers, and an airflow distribution plate at the windward end face is installed outside the first row of active coke adsorption layer, that is, the active coke adsorption layer at the windward end face. The air flow distribution plate on the end surface is only arranged on the outside of the first row of active coke adsorption layers from the bottom to 1/4~1/3 of the height, and an intermediate air flow distribution plate is installed between each row of active coke adsorption layers. On the vertical section, the opening ratio of the upper part is large and the lower part is small.

The opening ratio _P0 of the airflow distribution plate at the windward end face is 50-60%.

The middle air flow distribution plate is arranged on the entire section from the bottom to the top, the opening ratio _P1 of the upper part is 50-60%, the opening ratio _P2 of the middle part is 40-50%, and the opening ratio P2 of the lower part is 50-60%. _P3 is 30~40%.

The openings on the windward end face airflow distribution plate and the middle airflow distribution plate are round holes with a diameter of 20-50mm.

The openings on the airflow distribution plate on the windward end face and the middle airflow distribution plate are rectangular holes, the length of the horizontal side of the rectangular hole is 35-60mm, and the length of the vertical side is 10-35mm.

The openings on the windward end face airflow distribution plate and the middle airflow distribution plate are elliptical holes, the length of the elliptical hole along the horizontal axis is 35-60 mm, and the length of the vertical axis is 10-35 mm.

The active coke of the utility model is divided into multiple rows by the air distribution plate, and the saturated and unsaturated active coke adopt different moving speeds, so that the discharge volume and circulation of the active coke are small; through the optimization effect of the air distribution plate on the air flow, The flue gas and activated coke move in a combination of cross-flow and convection, which makes the airflow distribution in the purification device match the adsorption capacity of the active coke, the system has high purification efficiency, and the flue gas resistance is small.

Description of drawings

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

Fig. 2 is a schematic diagram of the opening ratio of the airflow distribution plate 5 on the windward end face;

FIG. 3 is a schematic diagram of the opening ratio of the middle air distribution plate 10 .

In the figure: 1 is the feed storage bin; 2 is the air intake chamber; 3 is the air intake grille; 4 is the active coke adsorption layer; 5 is the air flow distribution plate on the windward end surface; 6 is the unloader; 7 is the discharge bin; 8 is an air outlet chamber; 9 is an air outlet grille; 10 is an intermediate air distribution plate.

Detailed ways

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

Referring to Fig. 1, the utility model includes several rows of active coke adsorption layers 4 installed between the air inlet grille 3 and the outlet grille 9, and the upper and lower ends of each row of active coke adsorption layers 4 are connected with the feed storage bin 1 respectively. , the discharge bin 7 is connected, and an unloader 6 is installed at the lower end of each row of activated coke adsorption layers 4, and an air flow distribution plate 5 on the windward end face is installed outside the active coke adsorption layer of the first row, that is, the active coke adsorption layer on the windward end face , the airflow distribution plate 5 on the windward end face is only arranged at the height from the bottom to 1/4~1/3 outside the first row of active coke adsorption layer, see Figure 2, the opening ratio _P0 of the airflow distribution plate on the windward end face is 50~ 60%, each row of activated coke adsorption layers is installed with an intermediate air distribution plate 10, and the middle air distribution plate 10 adopts a large opening ratio in the upper part and a small lower part in the vertical section, see Figure 3, the middle air distribution plate 10 Arranged on the entire section from the bottom to the top, the opening ratio P ₁ of the upper part is 50~60%, the opening ratio P ₂ of the middle part is 40~50%, and the opening ratio P ₃ of the lower part is 30~40% .

The openings on the windward end face airflow distribution plate 5 and the middle airflow distribution plate 10 of the utility model are round holes, and the diameter of the round holes is 20-50mm.

The openings on the windward end face airflow distribution plate 5 and the middle airflow distribution plate 10 are rectangular holes, the side length of the rectangular hole along the horizontal direction is 35-60 mm, and the side length along the vertical direction is 10-35 mm.

The openings on the windward end face airflow distribution plate 5 and the middle airflow distribution plate 10 are elliptical holes, the length of the elliptical holes along the horizontal axis is 35-60 mm, and the length of the vertical axis is 10-35 mm.

The active coke flue gas purification device applied to a coal-fired power plant, its main structure active coke adsorption layer 4 is divided into multiple rows, in this embodiment is 3 rows, in the inlet chamber 2 and outlet chamber 8 of the active coke adsorption layer The air intake grille 3 and the air outlet grille 9 are respectively provided with a louver type air distribution device. Between the windward end surface of the active coke adsorption layer 4 and each layer of active coke, an air flow distribution plate 5 on the windward end surface and a middle air flow distribution plate 10 are respectively arranged. The middle air flow distribution plate 10 adopts a larger upper part and a smaller lower part the opening rate.

In this embodiment, the airflow distribution plate 5 on the windward end face is only arranged at the height from the bottom to 1/3, and the opening ratio _P0 of the air flow distribution plate on the windward end face is 55%.

In this embodiment, the middle air flow distribution plate 10 of the active coke layer is arranged on the entire section from the bottom end to the top end, the opening ratio _P1 of the upper part is relatively large, which is 55%, and the opening ratio _P2 of the middle part is 45%. %, the opening ratio P ₃ of the lower part is smaller, which is 35%.

In this embodiment, the openings on the windward end airflow distribution plate 5 and the middle airflow distribution plate 10 are round holes with a diameter of 35 mm.

In this embodiment, the flue gas first enters the air intake chamber 2, then enters the activated coke adsorption layer 4 through the air intake grille 3, and the purified flue gas enters the air outlet chamber 8 through the air outlet grille 9 discharge. In this embodiment, the flue gas passes through the air distribution effect of the airflow distribution plate 5 on the windward end face and the middle airflow distribution plate 10, and the lower flue gas not only passes through the active coke adsorption layer laterally, but also has Part of the flue gas passes through the active coke adsorption layer obliquely upwards, and the flue gas and the active coke move in a cross-flow and convective manner, so that more flue gas contacts the upper fresh active coke, while the lower part is close to saturated contact with the flue gas. There is relatively little gas, and the gas flow distribution matches the adsorption capacity of activated coke.

In this embodiment, fresh activated coke is stored in the feed storage bin 1, and the feed storage bin 1 communicates with the active coke adsorption layer 4, and the active coke adsorption layer 4 is divided into three rows by two intermediate airflow distribution plates 10, The active coke is discharged through the unloader 6 at the bottom of each column and enters the discharge bin 7 . In this embodiment, each column of activated coke adopts different moving speeds for saturated and unsaturated activated coke according to the concentration of adsorbed pollutants, and the saturation rate of discharged activated coke reaches more than 95%. and less circulation.

In this embodiment, the resistance of flue gas passing through the active coke layer is small, the thickness of the three rows of active coke layers is 2m in total, the superficial velocity of flue gas passing through the active coke layer is 0.28m/s, and the resistance of flue gas passing through the active coke layer It is about 2100Pa.

In this embodiment, the removal efficiency of pollutants is high, among which the removal efficiency of main pollutant SO ₂ reaches 97%, and the removal efficiency of SO ₃ , HCl, and HF reaches more than 98%.

Its beneficial effect of the utility model is mainly reflected in following four aspects:

First, the air flow distribution plate adopts a larger opening ratio in the upper part and a smaller opening ratio in the lower part in the vertical section, so that more flue gas contacts with the fresh activated coke in the upper part, while the flue gas in contact with the lower part close to adsorption saturation is relatively less , and the flue gas and activated coke move in a combination of cross-flow and convection, and the airflow distribution matches the adsorption capacity of the active coke, which improves the pollutant removal efficiency of the system.

Second, the airflow distribution plate on the windward end face is only arranged at the lower part and adopts a larger opening ratio, which not only optimizes the airflow distribution, but also prevents the system resistance from being too large.

Third, the middle air flow distribution plate of the active coke layer is arranged on the entire section, and the opening ratio is gradually increased from 30 to 60% from bottom to top, and the active coke layer is divided into multiple columns to control the The moving speed not only optimizes the airflow distribution, but also ensures the strength of the airflow distribution plate.

Fourth, the openings on the airflow distribution plate on the windward end face and the middle airflow distribution plate are circular, rectangular or elliptical holes, and an appropriate hole size is designed. It is not required that the hole size is smaller than the active coke particle size, which minimizes the The series flow between the active coke layers also facilitates the processing of the air distribution plate and reduces the system resistance.

Claims (6)

1. the airflow distribution device of activated coke flue gas adsorption tower, it is characterized in that: comprise the some row activated coke adsorption layers (4) that are installed between air-inlet grille (3) and the air outlet grate (9), on described each row activated coke adsorption layer (4), the lower end respectively with charging warehouse (1), discharging bin (7) is connected, in the lower end of each row activated coke adsorption layer (4) discharger (6) is installed, namely outside the activated coke adsorption layer of end face down with the wind end face airflow-distribution board (5) is installed down with the wind at first row activated coke adsorption layer, the end face airflow-distribution board that facings the wind only be arranged in the first row activated coke adsorption layer outside from bottom to 1/4 ~ 1/3 At The Height, between every row activated coke adsorption layer middle air flow distribution grid (10) is installed all, middle air flow distribution grid (10) adopts top large at vertical section, the percent opening that the bottom is little.

2. the airflow distribution device of activated coke flue gas adsorption tower according to claim 1 is characterized in that: the percent opening P of the described end face airflow-distribution board that facings the wind ₀Be 50 ~ 60%.

3. the airflow distribution device of activated coke flue gas adsorption tower according to claim 1, it is characterized in that: described middle air flow distribution grid (10) is arranged on the whole section on bottom to top, the percent opening P on top ₁Be 50 ~ 60%, the percent opening P at middle part ₂Be 40 ~ 50%, the percent opening P of bottom ₃Be 30 ~ 40%.

4. according to claim 1, the airflow distribution device of 2 or 3 described activated coke flue gas adsorption towers, it is characterized in that: the perforate on described facing the wind end face airflow-distribution board (5) and the middle air flow distribution grid (10) is circular hole, and Circularhole diameter is 20 ~ 50mm.

5. according to claim 1, the airflow distribution device of 2 or 3 described activated coke flue gas adsorption towers, it is characterized in that: the perforate on described facing the wind end face airflow-distribution board (5) and the middle air flow distribution grid (10) is rectangular opening, rectangular opening is 35 ~ 60mm along the horizontal length of side, is 10 ~ 35mm along the vertical length of side.

6. according to claim 1, the airflow distribution device of 2 or 3 described activated coke flue gas adsorption towers, it is characterized in that: the perforate on described facing the wind end face airflow-distribution board (5) and the middle air flow distribution grid (10) is slotted eye, slotted eye is 35 ~ 60mm along horizontal axial length, is 10 ~ 35mm along vertical axial length.

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