CN201073590Y - Absorbing tower with flue gas desulfurization - Google Patents

Abstract

The utility model discloses a flue gas desulfurization absorber tower, comprising a tower drum and a tower cover. A slurry circulating tank, an inlet of flue gas, a region of oxidation reaction, a spray level, a demister and a outlet of flue gas on the top of the tower drum are arranged successively in the tower drum from down to up, the spray level comprises a main pipe and a branch pipe, the branch pipe is laterally arranged on the main pipe, a nozzle is arranged on the branch pipe, a inlet of circulating slurry is arranged on the position of the tower drum corresponding to the main pipe of the spray level, a stainless steel mesh filter screen is arranged at the inlet of circulating slurry, the inlet of circulating slurry and the main pipe of the spray level are connected with each other; the demister is a two-level demister, the second order demister is on the first order demister, a cleanup spray nozzle is arranged at each demister, two non-metallic expansion joints are arranged respectively at the inlet of flue gas and the outlet of flue gas. The flue gas desulfurization absorber tower has the advantages of high desulfurization efficiency, little dosage of absorbent namely limestone, high equipment running efficiency, reducing production cost. The utility model is good equipment in the wet limestone-gypsum fuel gas desulfurization system for boiler flue gas, and is suitable for extension and application.

Description

Flue gas desulfurization absorption tower

technical field

The utility model belongs to the technical field of environmental protection equipment, in particular to a flue gas desulfurization absorption tower.

Background technique

In recent years, a single-tower wet flue gas desulfurization device integrating dust removal, cooling, absorption, and oxidation has been widely used, but the desulfurization efficiency of the current absorption tower is not high, and the amount of absorbent, namely limestone, is relatively large, and The operating rate of the equipment is low.

Utility model content

The purpose of this utility model is to provide a flue gas desulfurization absorption tower, which can improve the desulfurization efficiency of the absorption tower, reduce the amount of absorbent, improve the operation rate of the equipment, and reduce the production cost.

The technical scheme adopted in the utility model is: the flue gas desulfurization absorption tower is composed of a tower tube and a tower cover matched with the tower tube. The flue gas outlet at the top of the spray layer, demister and tower tube, where the lower side of the circulating slurry tank of the tower tube is provided with a limestone slurry inlet and an oxidation air inlet, the oxidation air inlet is above the limestone slurry inlet, and the lower part of the circulating slurry tank of the tower tube The other side is provided with a circulating slurry outlet and a gypsum slurry outlet. The gypsum slurry outlet is above the circulating slurry outlet. The spray layer includes a main pipe and a branch pipe. The cylinder and the main pipe of the spray layer are provided with a circulating slurry inlet, and a stainless steel mesh filter is arranged at the circulating slurry inlet, and the circulating slurry inlet is communicated with the main pipe of the spray layer; the demister is two The first-level demister, the second-level demister is above the first-level demister. Cleaning nozzles for downward spraying, cleaning nozzles for upward spraying on the lower layer, and cleaning water inlets on the tower corresponding to the demister, which are connected to the cleaning nozzles; flue gas inlets are set between the oxidation zone and the spray layer ; There are non-metallic expansion joints at the flue gas inlet and flue gas outlet respectively.

In the above-mentioned flue gas desulfurization absorption tower, the spray layers are at least three layers, and they are superimposed with different distances from each other. Every two layers of main pipes form an angle, and each spray layer is provided at the position corresponding to the main pipes. Circulation slurry inlet.

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be Z-shaped.

The above-mentioned flue gas desulfurization absorption tower and demister can also be horizontal.

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be herringbone.

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be rhombic.

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be X-shaped.

The beneficial effects of the utility model: the desulfurization efficiency of the flue gas desulfurization absorption tower is high, the amount of absorbent, that is, limestone is small, and the operation rate of the equipment is high, which reduces the production cost. It is a boiler tail gas limestone-gypsum wet flue gas desulfurization system A rare device in China, suitable for popularization and application.

Description of drawings

Fig. 1 is a structural representation of the utility model

Figure 2 is a top view of the spray layer of the utility model

Figure 3 is a top view of the utility model demister

Figure 4 is a sectional view of the utility model demister A-A

Fig. 5 is an A-A sectional view of another mode of the mist eliminator of the present invention

Fig. 6 is an A-A sectional view of another mode of the mist eliminator of the present invention

Fig. 7 is an A-A sectional view of another mode of the mist eliminator of the present invention

Fig. 8 is an A-A sectional view of another mode of the mist eliminator of the present invention

Fig. 9 is an A-A sectional view of another mode of the mist eliminator of the present invention

Detailed ways

As shown in Figure 1, the flue gas desulfurization absorption tower is composed of a tower tube and a tower cover 7 matched with the tower tube. The interior of the tower tube is sequentially composed of a circulating slurry pool 1, an oxidation reaction zone 6, and a spray layer from bottom to top. 2. The demister 3 and the flue gas outlet 4 at the top of the tower, wherein the lower side of the circulating slurry pool of the tower is provided with a limestone slurry inlet 1.1 and an oxidation air inlet 1.2, and the oxidation air inlet is above the limestone slurry inlet. The circulation of the tower The other side of the lower part of the slurry tank is provided with a circulating slurry outlet 1.3 and a gypsum slurry outlet 1.4, the gypsum slurry outlet is above the circulating slurry outlet, the spray layer includes a main pipe 2.1 and a branch pipe 2.2, and the branch pipe 2.2 is arranged laterally on the main pipe 2.1 On the top, the nozzle 2.3 is set on the branch pipe, and the position corresponding to the main pipe 2.1 of the spray layer is provided with a circulating slurry inlet 8. The circulating slurry inlet 8 communicates with the main pipe 2.1 of the spray layer, and the circulating slurry passes through the nozzle of the spray layer After 2.3, a fine spray is formed and sprayed into the oxidation reaction zone 6, so that the flue gas is rapidly cooled to saturation, and the CaCO ₃ in the circulating slurry chemically reacts with harmful substances such as SO ₂ , SO ₃ , HCl and HF in the flue gas, The generated CaSO ₄ and CaSO ₃ and the incompletely reacted slurry flow back to the circulating slurry tank, and the slurry is recycled under the action of the circulating slurry pump; a stainless steel mesh filter is installed at the inlet of the circulating slurry, and the stainless steel mesh at the inlet of the circulating slurry The grid-like filter screen can prevent the sediment in the tower from being sucked into the pump body to cause blockage or damage of the pump and blockage of the nozzle; When the flue gas carries liquid droplets through the first-level demister, the liquid droplets remain on the first-level demister due to inertia, and the first-stage demistered flue gas can then pass through the second-level demister to achieve better demisting. Fog effect, the upper layer of the primary demister is equipped with cleaning nozzle 3.1 for the lower spray, the lower layer is equipped with the cleaning nozzle 3.2 for the upper spray, the upper layer of the second-level demister is equipped with the cleaning nozzle 3.3 for the lower spray, and the lower layer is equipped with the cleaning nozzle for the upper spray Nozzle 3.4, the tower corresponding to the demister is provided with a cleaning water inlet 10, and each cleaning nozzle is connected to the cleaning water inlet, and the cleaning water is provided by the demister cleaning system, which is installed outside the absorption tower to clean The system adopts automatic control, and the cleaning system operates intermittently. The cleaning water is sprayed from the nozzle to the demister element, taking away the solid particles on the downstream and countercurrent surfaces of the demister, and the cleaning water is also used to supplement the water in the absorption tower. Loss; a flue gas inlet 5 is set between the oxidation zone and the spray layer; a non-metallic expansion joint 9.1 is set at the flue gas entrance 5, and a non-metallic expansion joint 9.2 is set at the flue gas outlet. To compensate for the longitudinal deformation of the flue due to temperature changes.

In the above-mentioned flue gas desulfurization absorption tower, the spray layers are at least three layers, and they are superimposed with different distances from each other. Every two layers of main pipes form an angle, and each spray layer is provided at the position corresponding to the main pipes. At the inlet of the circulating slurry, the flue gas desulfurized by a spray layer continues to rise and reaches the upper spray layer. The flue gas interacts with the slurry from the upper spray layer to undergo a chemical reaction, so that SO ₂ and SO ₃ can be absorbed to the greatest extent. .

In the above-mentioned flue gas desulfurization absorption tower, the demister is Z-shaped as shown in Figure 4, and the flue gas enters the Z-shaped demister due to the deflection of the channel, and the liquid droplets hit the demister and are collected. The gas-liquid separation is realized under the action of inertia, and the purified flue gas after removing the liquid droplets continues to rise into the chimney and be discharged into the atmosphere.

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be used as a horizontal type as shown in Figure 5 .

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be herringbone as shown in Fig. 6 and Fig. 7 .

In the above-mentioned flue gas desulfurization absorption tower, the demister can also be used as a rhombus as shown in Figure 8 .

In the above-mentioned flue gas desulfurization absorption tower, the mist eliminator can also be in an X shape as shown in Figure 9 .

The working process of the utility model: the boiler flue gas enters the flue gas desulfurization absorption tower after being dedusted by the dust collector, cooled by the heat exchanger and boosted by the booster fan. The flue gas first enters the oxidation reaction zone 6 at the lower part of the tower, and the circulating slurry in the circulating slurry tank 1 is pumped out by the circulating slurry pump and enters the spray layer 2, and then sprayed into the oxidation reaction zone through the nozzle 2.3, the flue gas is rapidly cooled to saturation, and the slurry in the slurry CaCO ₃ chemically reacts with harmful substances such as SO ₂ , SO ₃ , HCl and HF in the flue gas, and the generated CaSO ₄ and CaSO ₃ and the incompletely reacted slurry flow back to the circulating slurry pool, and the slurry is in the circulating slurry pump. Under the effect of recycling. The flue gas continues to rise and reaches the upper spray layer, the flow velocity of the flue gas changes, interacts with the slurry from the upper spray layer, produces gas-liquid turbulent diffusion, and the chemical reaction is significantly accelerated, SO ₂ and SO ₃ are further absorbed, and the generated CaSO ₄ and CaSO ₃ and the incompletely reacted slurry flow back to the circulating slurry tank, the flue gas continues to rise and reaches the upper spray layer, and the flue gas interacts with the slurry from the upper spray layer to undergo a chemical reaction, SO ₂ and SO ₃ The CaSO ₃ in the circulating slurry in the circulating slurry pool reacts completely under the action of oxidizing air to form CaSO ₄ , and the CaSO ₄ is sent to the gypsum dehydration device under the action of the gypsum slurry pump. The flue gas that has completed the desulfurization process reaches the demister 3, which is in a zigzag shape, and the flue gas enters the zigzag demister. Due to the deflection of the channel, the liquid droplets hit the demister and are collected, which is realized under the action of inertia. The gas and liquid are separated, and the purified flue gas that removes the liquid droplets continues to rise into the chimney and be discharged into the atmosphere.

Claims (7)

1. fume desulfurating absorption tower, by the tower tube with constitute with the equipped mutually tower lid of tower tube, tower tube inside is followed successively by the recycle slurry liquid pool from bottom to top, oxidation reaction zone, spraying layer, the exhanst gas outlet at demister and tower tube top, recycle slurry liquid pool bottom one side of described tower tube is established lime stone slurry inlet and oxidation air inlet, the oxidation air inlet is above the lime stone slurry inlet, the recycle slurry liquid pool bottom opposite side of tower tube is established loop slurry outlet and gypsum slurries outlet, the gypsum slurries outlet is below the loop slurry outlet, it is characterized in that: described spraying layer comprises female pipe and arm, the arm side direction is located on female pipe, nozzle is located on the arm, the tower tube is managed with the mother of spraying layer and is established the loop slurry inlet on the corresponding position, the loop slurry porch is provided with stainless (steel) wire trellis filter screen, and the loop slurry inlet communicates with female pipe of spraying layer; Described demister is the two-stage demister, the secondary demister is on the one-level demister, the upper strata of one-level demister is provided with down the washer jet of spray, lower floor is provided with the washer jet of spray, the upper strata of secondary demister is provided with down the washer jet of spray, lower floor is provided with the washer jet of spray, and the tower tube of demister correspondence is provided with the rinse water inlet, and the rinse water inlet communicates with washer jet; Between zoneofoxidation and spraying layer, establish smoke inlet; Be respectively equipped with non-metal expansion joint at smoke inlet and exhanst gas outlet.

2. fume desulfurating absorption tower according to claim 1 is characterized in that: at least three layers of described spraying layers, and the phase mutual deviation opens distance stack, tubular the having angle of every two-layer mother, and every layer of spraying layer tower tube position corresponding with female pipe all established loop slurry and entered the mouth.

3. fume desulfurating absorption tower according to claim 2 is characterized in that: described demister is the Z font.

4. fume desulfurating absorption tower according to claim 2 is characterized in that: described demister is a horizontal type.

5. fume desulfurating absorption tower according to claim 2 is characterized in that: described demister is chevron shaped.

6. fume desulfurating absorption tower according to claim 2 is characterized in that: described demister is a diamond pattern.

7. fume desulfurating absorption tower according to claim 2 is characterized in that: described demister is the X font.

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