CN204447736U - Double loop fume desulfurizing tower - Google Patents

Abstract

The utility model discloses a double-circuit flue gas desulfurization tower. The inner cylinder, the bottom of the inner cylinder is placed on the support beam at the lower part of the tower body, and the support beam divides the slurry tank into a high pH value area and a low pH value area. The inner cavity of the inner cylinder is connected to the inlet flue, there is a flue gas channel on the top, and there is a low pH value spray layer in the inner cavity. The low pH value slurry above the support beam in the cylinder and the high pH value slurry below the support beam in the tower body are respectively pumped by the circulation pump into the corresponding spray layer. The flue gas directly enters the inner cylinder, is sprayed with a low pH value slurry, enters the tower body, is sprayed with a high pH value slurry, and finally discharged from the outlet flue above the tower body. In order to prevent the slurry in the area between the inner cylinder and the tower body from settling, the slurry in this area is stirred by the slurry suspension pump. There are two desulfurization circuits in the same absorption tower, which ensures efficient desulfurization while reducing floor space and cost.

Description

Double loop flue gas desulfurization tower

technical field

The utility model relates to a flue gas desulfurization tower, in particular to a flue gas desulfurization tower with two desulfurization circuits in one tower.

Background technique

The concept of "ultra-low emission" has been gradually promoted and implemented, and the emission concentration of sulfur dioxide in the flue gas is required to be lower than 35mg/Nm3. Traditional towers such as empty tower spraying and liquid column towers are difficult to achieve this emission requirement. At present, the double-loop tower has been verified in many projects and can fully meet the ultra-low emission requirements. However, the current double-loop tower adopts the structure of two towers, although it can have a high desulfurization efficiency, it has certain disadvantages. The main manifestations are: the two towers occupy a large area, and there is not enough space to install two absorption towers in many power plants; the upper spray liquid is collected in the form of a funnel, and long-term operation will inevitably cause slurry precipitation due to this structural feature, and then Blocking the pipeline for collecting the slurry in the funnel; the high pH value tower collecting the slurry returns the slurry to the low pH value tower for oxidation, which is often in the form of overflow, which is likely to cause blockage of the overflow pipeline. If the pump is used to transport it, the power consumption of the pump will be additionally increased.

Utility model content

The purpose of the utility model is to provide a single-tower double-circuit flue gas desulfurization system with less land occupation and low cost.

The utility model discloses a double-circuit flue gas desulfurization tower. There is a demister on the upper part of the inner cavity of the tower, a spray layer with a high pH value is arranged below the demister, and an outlet smoke is provided above the corresponding demister on the tower body. road. Below the high PH spray layer in the tower, there is an inner cylinder with a top. The outer diameter of the inner cylinder is smaller than the inner diameter of the tower. In the inner cavity of the tower body, there is a low pH value spray layer above the corresponding inlet flue in the inner cylinder. the

There is a support beam in the slurry tank at the bottom of the tower corresponding to the inlet flue in the tower body, and the bottom of the inner cylinder is placed on the support beam; the top of the inner cylinder is a ridge type, and the flue gas channel is a hood type aisle.

The lower part of the side wall of the inner cylinder is connected with a side-entry agitator and an oxidation lance, and the stirring device of the side-entry agitator and the nozzle of the oxidation lance extend into the inner cavity of the inner cylinder, and the oxidation lance is located at the side of the side-entry agitator. above.

Two circulation pumps, one slurry suspension pump and one gypsum slurry discharge pump are arranged outside the tower, and one circulation pump pumps the high pH value slurry from the lower part of the support beam in the tower body to the high pH value spray layer for spraying. Another circulating pump pumps the low-PH value slurry in the inner cylinder to the low-PH value spray layer for spraying, and the slurry suspension pump pumps the high-PH value slurry from the lower part of the support beam in the tower body and pumps it back to the space between the tower body and the inner cylinder Agitate the slurry in the annular area to prevent the slurry from depositing and blocking the slurry channel. The gypsum slurry discharge pump discharges the gypsum slurry in the inner cylinder.

The working principle is as follows: a layer of inner cylinder with a top is installed in the traditional absorption tower, and a hood-shaped flue gas channel is set on the top of the inner cylinder to ensure that the flue gas enters the outside of the cylinder with the least resistance, and a low pH is set in the inner cylinder. value spray layer, the bottom of the inner cylinder is supported on the tower body by supporting beams, and the high pH value slurry outside the cylinder can automatically flow to the low pH value slurry area inside the cylinder through the gap between the support beams. In order to prevent the slurry between the inner cylinder and the tower body from settling, a slurry suspension pump is used to pump and stir the slurry in the high PH value area. The low pH value slurry is stirred and oxidized through the side-entry agitator and the oxidation spray gun, and finally discharged out of the tower through the gypsum slurry discharge pump. The flue gas enters the inner cylinder directly from the inlet flue, and is first sprayed and absorbed by the slurry with a low pH value, and then passes through the flue gas hood channel on the top of the inner cylinder and enters the high pH value area through the top of the inner cylinder. After the gas is demistered by the demister, it enters the outlet flue on the upper part of the tower body and is discharged.

In addition to supporting the inner cylinder, the support beam can also realize the partial isolation of the slurry tank with low pH value inside the cylinder and the pulp tank with high pH value outside the tube, so that the slurry properties of the two pulp tanks are stable, so as to ensure the absorption efficiency of the two slurry tanks. The ridge-shaped top avoids the accumulation and sedimentation that may be caused by the high-PH value slurry falling on the top of the inner cylinder, and reduces the load on the inner cylinder, so that the inner cylinder only bears its own weight and reduces the amount of materials used. The hood-shaped flue gas channel allows the flue gas to pass through the top of the inner cylinder with the least resistance after being sprayed and absorbed by the low-PH value slurry in the inner cylinder, and enter the high-PH-value slurry spray area, but the high-PH-value spray in the tower body The slurry will not enter the inner cylinder, but will all fall on the top of the cylinder and then flow to the slurry tank area between the inner cylinder and the tower body.

The utility model realizes single-tower double-circuit flue gas desulfurization by arranging a layer of cylinder in the absorption tower body, overcomes the defect of using two towers in the existing double-circuit desulfurization technology, occupies less land, and has low cost.

Description of drawings

Fig. 1 is a front structural schematic diagram of an embodiment of the present invention.

Fig. 2 is an enlarged schematic diagram of the plane layout of the flue gas channel at the top of the inner tube in Fig. 1 .

Fig. 3 is an enlarged schematic diagram of the planar arrangement of the supporting beams in Fig. 1 .

Detailed ways

As shown in Figures 1 to 3, the utility model discloses a double-circuit flue gas desulfurization tower, which includes a tower body 1, a demister 11 on the upper part of the inner cavity, and a high-PH spray nozzle below the demister 11. The shower layer 12 has an outlet flue 13 above the corresponding demister 11 on the tower body 1 . Below the high-PH value spray layer 12 in the tower body 1, there is an inner cylinder 2 with a roof-shaped top, and the outer diameter of the inner cylinder 2 is smaller than the inner diameter of the tower body 1. The side wall of the inner cylinder 2 is connected with an inlet flue 21, and the top is connected with an upward-facing hood-shaped flue gas channel 22 to guide the flue gas into the inner cavity of the tower body 1. There is a low level above the corresponding inlet flue 21 in the inner cylinder 2. PH value spray layer 23.

There is a supporting beam 14 below the corresponding inlet flue 21 in the tower body 1 , and the bottom of the inner tube 2 is placed on the supporting beam 14 . The lower part of the side wall of the inner cylinder 2 is connected with a side entry agitator 3 and an oxidation lance 4 . The stirring device of the side-entry agitator 3 and the nozzle of the oxidation lance 4 protrude into the inner cavity of the inner cylinder 2 , and the oxidation lance 4 is located above the side-entry agitator 3 .

Two circulation pumps 5, one slurry suspension pump 6 and one gypsum slurry discharge pump 7 are arranged outside the tower body 1. One circulation pump 5 pumps the high-PH value slurry in the lower part of the support beam 14 in the tower body 1 to the high-PH value spray layer 12 for spraying, and the other circulation pump 5 pumps the low-PH value slurry in the inner cylinder 2 to the low-pH value. The PH value spray layer 23 is used for spraying, the slurry suspension pump 6 extracts the high PH value slurry from the lower part of the support beam 14 in the tower body 1, and pumps it back to the annular area between the suction tower body 1 and the inner cylinder 2, and the gypsum slurry is discharged by the pump 7 The gypsum slurry in the inner cylinder 2 is discharged.

The working principle is as follows: a layer of inner cylinder with a top is installed in the traditional absorption tower, and a hood-shaped flue gas channel is set on the top of the inner cylinder to ensure that the flue gas enters the outside of the cylinder with the least resistance, and a low pH is set in the inner cylinder. value spray layer, the bottom of the inner cylinder is supported on the absorption tower body by supporting beams, and the high pH value slurry outside the cylinder can automatically flow to the low pH value slurry area inside the cylinder through the gap between the support beams. In order to prevent the slurry between the inner cylinder and the tower body from settling, a slurry suspension pump is used to pump and stir the slurry in the high PH value area. The low pH value slurry is stirred and oxidized through the side-entry agitator and the oxidation spray gun, and finally discharged out of the tower through the gypsum slurry discharge pump. The flue gas enters the inner cylinder directly from the inlet flue, and is first sprayed and absorbed by the slurry with a low pH value, and then passes through the flue gas hood channel on the top of the inner cylinder and enters the high pH value area through the top of the inner cylinder. After the gas is demistered by the demister, it enters the outlet flue of the tower and is discharged.

In addition to supporting the inner cylinder, the support beam can also realize the partial isolation of the slurry tank with low pH value inside the cylinder and the pulp tank with high pH value outside the tube, so that the slurry properties of the two pulp tanks are stable, so as to ensure the absorption efficiency of the two slurry tanks. The ridge-shaped top avoids the accumulation and sedimentation that may be caused by the high-PH value slurry falling on the top of the inner cylinder, and reduces the load on the inner cylinder, so that the inner cylinder only bears its own weight and reduces the amount of materials used. The hood-shaped flue gas channel allows the flue gas to pass through the top of the inner cylinder with the least resistance after being sprayed and absorbed by the low-PH value slurry in the inner cylinder, and enter the high-PH-value slurry spray area, but the high-PH-value spray in the tower body The slurry will not enter the inner cylinder, but will all fall on the top of the cylinder and then flow to the slurry tank area between the inner cylinder and the tower body.

The utility model realizes single-tower double-circuit flue gas desulfurization by arranging a layer of cylinder in the absorption tower body, overcomes the defect of using two towers in the prior art, occupies less land, and has low cost.

Claims (4)

1. a double loop fume desulfurizing tower, demister is arranged at the top of its tower body inner chamber, there is high pH value spraying layer the below of demister, on tower body, there is exhaust pass the top of corresponding demister, it is characterized in that: in described tower body, there is the inner core at band top the below of high PH spraying layer, and the external diameter of inner core is less than tower body internal diameter, and the sidewall of inner core is connected with inlet flue duct, flue gas imports in the inner chamber of tower body by the exhaust gases passes that top is connected with upward, and in inner core, there is low pH value spraying layer the top of corresponding inlet flue duct.

2. double loop as claimed in claim 1 fume desulfurizing tower, is characterized in that: in described tower body corresponding described inlet flue duct lower squarer prime cement pond in have brace summer, the bottom of described inner core is placed on brace summer; The top of described inner core is ridge-roof type, and described exhaust gases passes is wind-cowl passage.

3. double loop as claimed in claim 2 fume desulfurizing tower, it is characterized in that: the lower sidewall of described inner core is connected with side-feeding mixer and oxidation spray gun, the agitating device of side-feeding mixer and the nozzle of oxidation spray gun stretch in the inner chamber of inner core, and oxidation spray gun is positioned at the top of side-feeding mixer.

4. double loop as claimed in claim 3 fume desulfurizing tower, it is characterized in that: outside described tower body, be furnished with two circulating pumps and slurries levitated pump, a gypsum slurries excavationg pump, the paramount pH value spraying layer of high pH value slush pump of tower body inner support beam bottom sprays by a circulating pump, low pH value slush pump in inner core to low pH value spraying layer sprays by another circulating pump, and the annular region that the high pH value slush pump that slurries levitated pump extracts tower body inner support beam bottom is sent back between tower body and inner core stirs slurries; Gypsum slurries in inner core is discharged by gypsum slurries excavationg pump.