CN203227404U - Novel sectional type cross flow smoke purifying and absorbing tower - Google Patents

Abstract

A new segmented cross-flow flue gas purification adsorption tower, which includes a feeding hopper, a distributor, an active coke bed and a discharge hopper connected in sequence from top to bottom. The inside of the active coke bed is the middle flue gas collection chamber, and the It is divided into the upper clean flue gas collection chamber and the lower raw flue gas distribution chamber by the double-layer annular partition. The connected raw flue gas inlet flue, the active coke bed, the raw flue gas distribution chamber, the clean flue gas collection chamber and the cross-section of the entire tower body are circular; with the adsorption tower of the utility model, the flue gas High pollutant removal efficiency, SO ₂ removal efficiency is greater than 96%, SO ₃ , HCl, HF removal efficiency is greater than 98%, heavy metal Hg removal efficiency is greater than 90%, dust removal efficiency is greater than 80%; at the same time, this practical The new type also has the advantages of convenient and uniform feeding, smooth blanking, high utilization of active coke, and easy large-scale operation.

Description

A New Segmented Cross-flow Flue Gas Purification Adsorption Tower

technical field

The utility model relates to an active coke dry method adsorption tower for desulfurizing waste gas from power plant boilers, metallurgy, garbage incineration and chemical industries, in particular to a novel sectioned cross-flow flue gas purification adsorption tower.

Background technique

In the field of flue gas desulfurization of coal-fired power stations, more than 90% of them currently use the limestone-gypsum wet flue gas desulfurization process. Although this process is mature and widely used, its shortcomings have gradually emerged during the application process: 1) High water consumption: For power plant boiler flue gas desulfurization devices without flue gas heat exchanger GGH, the water consumption per million kilowatt units is as high as 220-250m ³ /h; 2) Chimney anticorrosion and "gypsum rain" problems: wet The flue gas at the outlet of the desulfurization device using the desulfurization method is saturated wet flue gas, and high-grade anticorrosion must be carried out on the chimney, and the problem of "gypsum rain" in the chimney may also occur, causing secondary pollution to the surrounding environment; The liquid droplets carried in the flue gas are gypsum slurry with a concentration of about 20%, which contains certain solid particles, which is dust pollution when discharged into the atmosphere; 4) The problem of massive limestone mining and gypsum accumulation: due to the widespread use of limestone-gypsum wet method The flue gas desulfurization process has led to the mining of a large number of limestone mountains, and also caused the accumulation of desulfurized gypsum in some areas.

According to my country's coal power development plan, the future will focus on building large-scale coal power bases. my country's coal-rich areas are mainly located in the north, which is also a water-scarce area. The activated coke dry flue gas purification process consumes less water, saving more than 90% of water compared with the traditional wet desulfurization, and the adsorbent activated coke is made of coal, and the by-product is concentrated sulfuric acid, which can be recycled and utilized, without causing a large amount of limestone mining and Gypsum buildup problem. In addition, in the key areas of environmental protection, the environmental capacity is small and the environmental protection standards are strict. The activated coke flue gas purification process can simultaneously and efficiently remove SO ₂ , SO ₃ , NOx, HCl, HF, Hg, fine dust, etc., and there is no traditional The "gypsum rain" of wet desulfurization and the carryover of clean flue gas droplets can meet very strict environmental protection standards and are suitable for flue gas purification in environmentally sensitive areas.

In addition, for the purification of steel sintering flue gas and waste incineration flue gas, activated coke can simultaneously adsorb dioxin pollutants, while the traditional wet desulfurization process cannot effectively remove dioxin. Therefore, activated coke is suitable for multi-pollutant removal and deep purification of sintering flue gas and waste incineration flue gas.

The adsorption tower is the core equipment of the activated coke flue gas desulfurization process, but the application of this process in my country is just in its infancy, especially the power plant scale application has no performance in my country, so my country urgently needs to develop a new type of adsorption tower with independent intellectual property rights structure.

Utility model content

In order to solve the problems existing in the above-mentioned prior art, the purpose of this utility model is to provide a novel sectioned cross-flow flue gas purification adsorption tower, which has the advantages of high pollutant removal efficiency, small system resistance, high utilization rate of active coke, and circulation Small quantity, low breakage rate, uniform cloth distribution, smooth unloading and stable operation of the device.

In order to achieve the above object, the utility model adopts the following technical solutions:

A new segmented cross-flow flue gas purification adsorption tower, including a feed hopper 1, a distributor 2 is arranged at the lower part of the feed hopper 1, an active coke bed 9 with a circular cross section is arranged at the lower part of the distributor 2, and an active coke bed 9 The interior is an intermediate flue gas collection chamber 6, and the exterior is divided into an upper clean flue gas collection chamber 4 and a lower raw flue gas distribution chamber 10 by a double-layer annular partition 8. The gas collection chambers (6) are connected through the middle flue gas collection chamber grid 7, the activated coke bed 9 is connected with the clean flue gas collection chamber 4 through the clean flue gas collection grid 5, and the active coke bed 9 It communicates with the original flue gas distribution chamber 10 through the original flue gas inlet grid 11. The upper part of the clean flue gas collection chamber 4 is provided with an outlet flue 3 communicating with it. The original flue gas distribution chamber 10 The lower part is provided with a raw flue gas inlet flue 12 communicating with it, the lower part of the activated coke bed 9 is provided with a discharge hopper 14, and the lower part of the discharge hopper 14 is provided with a discharge valve 15, and the lower part of the intermediate flue gas collection chamber 6 is An ash hopper 16 is provided, and an ash unloading valve 17 is provided at the lower part of the ash hopper 16; the cross-sections of the activated coke bed 9, the raw flue gas distribution chamber 10, the clean flue gas collection chamber 4 and the entire tower body are all circular ring.

The shape of the distributor 2 is a cone.

The angle α between the generatrix of the cone and the horizontal plane is larger than 40°.

The distance between the two layers of the double-layer annular partition 8 is greater than twice the average thickness of the active coke bed 9 .

The average thickness D of the active coke bed 9 is 0.8-2.5m.

The centerline of the discharge hopper 14 is arranged outside the centerline of the active coke bed 9 .

The discharge hopper 14 is provided with 1 to 5 deflectors 13, and the angle between the deflectors 13 and the horizontal increases sequentially from the inside to the outside.

The discharge hopper 14 is arranged in partitions, and the number of partitions is 1, 2, 3, 4, 6, 9, 12.

Compared with the prior art, the utility model has the following advantages:

1. The adsorption tower of this utility model has a circular ring shape as a whole. Compared with the square tower, it has a simple structure, saves materials, is easy to enlarge, discharges smoothly, is not prone to dead spots, and can avoid stress concentration. At the same time, since the entire tower body is in the shape of a ring, with a conical distributor inside, the single-point feeding on the upper part can realize the uniform feeding of the whole system, which reduces the requirements on the conveying system.

2. The adsorption tower of this utility model is divided into two sections by double-layer annular partitions. The active coke flows from top to bottom relying on gravity, and the active coke with a higher saturation in the lower part first contacts with the original flue gas to further increase the saturation of the active coke. , Part of the desulfurized flue gas passes through the middle flue gas collection chamber and then contacts with the upper fresh activated coke, so as to ensure a high desulfurization efficiency. Compared with the existing single-stage cross-flow technology, the utility model has high outlet active coke saturation, large overall adsorption sulfur capacity, and high desulfurization efficiency, thereby reducing the loading and circulation of active coke, reducing the volume of the adsorption tower, and reducing the breakage rate , construction and operating costs are reduced.

3. The adsorption tower of this utility model is divided into two sections by double-layer annular partitions. The flue gas with high _SO2 concentration in the upper half section first contacts with the active coke inside the bed, so that the saturation of the active coke inside is higher than that of the outside active coke. After entering the second half, the high-concentration SO ₂ flue gas first contacts with the active coke outside the bed, so that the outlet active coke saturation tends to be uniform.

4. The discharge hopper of the utility model is arranged on the outside of the active coke layer, and at the same time, a deflector is installed inside, so as to ensure that the moving speed of the active coke outside the active coke layer is greater than that of the inner active coke, and the average saturation of the outlet active coke increases.

Description of drawings

Fig. 1 is the front view of the adsorption tower of the present utility model.

Figure 2 is a top view of the adsorption tower of the present invention.

Figure 3 is a schematic diagram of the inclination angle of the distributor.

Detailed ways

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

As shown in Fig. 1 and Fig. 2, a new segmented cross-flow flue gas purification adsorption tower of the utility model includes a feed hopper 1, a distributor 2 is arranged at the lower part of the feed hopper 1, and a cross section is arranged at the lower part of the distributor 2. The active coke bed 9, the inside of the active coke bed 9 is the middle flue gas collection chamber 6, and the outside is divided into the upper clean flue gas collection chamber 4 and the lower raw flue gas distribution chamber by double-layer annular partitions 8 10. The active coke bed 9 communicates with the intermediate flue gas collection chamber (6) through the intermediate flue gas collection chamber grid 7, and the activated coke bed 9 and the clean flue gas collection chamber 4 pass through the clean flue gas The gas collection grid 5 is connected, the active coke bed 9 is connected with the original flue gas distribution chamber 10 through the original flue gas inlet grid 11, and the upper part of the clean flue gas collection chamber 4 is provided with an outlet smoke Road 3, the lower part of the raw flue gas distribution chamber 10 is provided with a raw flue gas inlet flue 12 communicating with it, the lower part of the activated coke bed 9 is provided with a discharge hopper 14, and the lower part of the discharge hopper 14 is provided with a discharge valve 15. The lower part of the middle flue gas collection chamber 6 is provided with an ash hopper 16, and the lower part of the ash hopper 16 is provided with an ash unloading valve 17; The cross section of the chamber 4 and the entire tower body is circular.

As a preferred embodiment of the present invention, the distance between the two layers of the double-layer annular partition 8 is greater than twice the average thickness of the active coke bed 9 .

As a preferred embodiment of the present invention, the average thickness D of the active coke bed layer 9 is 0.8-2.5m.

As a preferred embodiment of the present invention, the centerline of the discharge hopper 14 is arranged outside the centerline of the active coke bed 9 .

As a preferred embodiment of the present utility model, 1 to 5 deflectors 13 are arranged in the discharge hopper 14, and the included angles between the deflectors 13 and the horizontal gradually increase from inside to outside.

As a preferred embodiment of the present utility model, the discharge hopper 14 is arranged in partitions, and the number of partitions is 1, 2, 3, 4, 6, 9, 12.

As shown in Fig. 3, as a preferred embodiment of the present invention, the shape of the distributor 2 is a cone, and the angle α between the generatrix of the cone of the cone and the horizontal plane is greater than 40°.

The working principle of the utility model is: the active coke is fed from the feeding hopper 1, the active coke is evenly distributed in the bed through the conical distributor 2, the boiler flue gas enters the adsorption tower from the original flue gas inlet flue 12, and the airflow velocity Due to the high resistance of the bed layer, the airflow is evenly distributed in the circumferential direction of the original flue gas distribution chamber 10, passing through the lower half of the active coke layer and first contacting the semi-saturated active coke, so that the outlet active coke reaches a higher degree of saturation , after the partially desulfurized flue gas enters the middle flue gas collection chamber 6, the airflow goes up, vertically passes through the upper half active coke bed 9 and then contacts with the upper half fresh active coke, passes through the clean flue gas collection chamber 4 Collect and flow out of the adsorption tower from outlet flue 3. The active coke descends by gravity, and flows out of the adsorption tower through multiple unloading valves arranged along the circumference of the lower part.

As shown in Figure 1 and Figure 2, the entire tower structure of the utility model adopts a cylindrical shape, and a conical distributor is arranged inside, and a plurality of unloading hoppers are arranged along the circumferential direction at the lower part, which not only ensures smooth unloading, but also does not cause stagnation areas , and uniform feeding can be achieved through a single point, without the need to arrange a long-axis roller unloader, which reduces the requirements for the conveying system.

As shown in Figure 1, the utility model arranges a double-layer annular partition in the outer ring, and the distance between the two partitions is slightly greater than twice the thickness of the active coke bed, so as to reasonably organize the flow direction of the flue gas and realize the separation section, the original flue gas enters from the lower part of the adsorption tower, and the high-concentration SO ₂ gas first contacts with the semi-saturated activated coke, so that the outlet activated coke reaches a higher saturation degree, and the partially desulfurized flue gas goes up, and then with the upper half of the fresh Active coke contact, so as to achieve a higher desulfurization efficiency. In this way, the residence time of active coke in the tower and the adsorption capacity of sulfur are greatly increased, the loading and circulation of active coke are reduced, and the system investment and operating costs are greatly increased. Adopting the adsorption tower of the utility model, the removal efficiency of pollutants in the flue gas is high, the removal efficiency of SO ₂ is greater than 96%, the removal efficiency of SO ₃ , HCl, and HF is greater than 98%, and the removal efficiency of heavy metal Hg is greater than 90%. The dust removal efficiency is greater than 80%.

Claims (8)

1. A new segmented cross-flow flue gas purification adsorption tower, including a feeding hopper (1), characterized in that: the lower part of the feeding hopper (1) is provided with a distributor (2), and the lower part of the distributor (2) is provided with a cross section It is a ring-shaped active coke bed (9), and the inside of the active coke bed (9) is an intermediate flue gas collection chamber (6), and the outside is separated by a double-layer annular partition (8) into an upper clean flue gas collection chamber (4) and the lower original flue gas distribution chamber (10), the activated coke bed (9) communicates with the intermediate flue gas collecting chamber (6) through the intermediate flue gas collecting chamber grid (7), The active coke bed (9) is connected to the clean flue gas collection chamber (4) through the clean flue gas collection grid (5), and the active coke bed (9) is connected to the original flue gas distribution chamber (10) through The original flue gas inlet grid (11) is connected, the upper part of the clean flue gas collection chamber (4) is provided with an outlet flue (3) communicating with it, and the lower part of the original flue gas distribution chamber (10) is provided There is a raw flue gas inlet flue (12) connected to it, a discharge hopper (14) is provided at the lower part of the activated coke bed (9), and a discharge valve (15) is provided at the lower part of the discharge hopper (14). The lower part of the middle flue gas collection chamber (6) is provided with an ash hopper (16), and the lower part of the ash hopper (16) is provided with an ash unloading valve (17); the activated coke bed (9), the original flue gas distribution chamber ( 10), the clean flue gas collection chamber (4) and the cross-section of the entire tower body are circular. 2. A new sectioned cross-flow flue gas purification adsorption tower according to claim 1, characterized in that: the shape of the distributor (2) is a cone. 3. A novel sectioned cross-flow flue gas purification adsorption tower according to claim 2, characterized in that: the angle α between the conical generatrix of the cone and the horizontal plane is greater than 40°. 4. A new sectioned cross-flow flue gas purification adsorption tower according to claim 1, characterized in that: the distance between the two layers of the double-layer annular partition (8) is greater than that of the active coke bed (9 ) twice the average thickness. 5 . A novel sectioned cross-flow flue gas purification adsorption tower according to claim 4 , characterized in that: the average thickness D of the activated coke bed ( 9 ) is 0.8-2.5 m. 6. A new sectioned cross-flow flue gas purification adsorption tower according to claim 1, characterized in that: the centerline of the unloading hopper (14) is arranged outside the centerline of the active coke bed (9) . 7. A novel sectioned cross-flow flue gas purification adsorption tower according to claim 1, characterized in that: 1 to 5 deflectors (13) are arranged in the discharge hopper (14), and the The included angle between the deflector (13) and the horizontal increases sequentially from inside to outside. 8. A new sectioned cross-flow flue gas purification adsorption tower according to claim 1, characterized in that: the unloading hopper (14) is arranged in partitions, and the number of partitions is 1, 2, 3, 4, 6 , 9, 12.

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