CN207980838U - A kind of reciprocating two-region spray absorber - Google Patents

Abstract

The utility model is related to desulfurization and dedusting fields, refer in particular to a kind of reciprocating two-region spray absorber, including cylinder, the uptake zones L and the uptake zones H are divided by partition board in the cylinder, it is respectively arranged with several spraying layers in the uptake zones L and the uptake zones H, L stock tanks area and H stock tanks area are corresponded to respectively below the uptake zones L and the uptake zones H, and the spraying layer of the uptake zones L extracts slurries by circulating pump from L stock tanks area, and the spraying layer of the uptake zones H extracts slurries by circulating pump from H stock tanks area.Under the premise of meeting CaSO3 oxidations and gypsum crystallization, SO2 removal efficiencies are increased substantially.

Description

A reciprocating double-zone spray absorption tower

technical field

The utility model relates to the field of desulfurization and dust removal, in particular to a reciprocating double-zone spray absorption tower.

Background technique

At present, limestone-gypsum empty-tower spray technology or double-tower (single-tower) double-cycle technology is mostly used in the coal-fired flue gas wet desulfurization process. Due to the restriction of the direct product CaSO3 oxidation and the acidic environment required by gypsum crystallization, the spray empty tower technology generally needs to control the pH value of the slurry tank below 6, so the improvement of desulfurization efficiency mainly depends on increasing the liquid-gas ratio (L/G), that is, increasing The number of spray layers can be realized; the double-tower (single-tower) double-circulation technology relies on _two absorption towers connected in series (or an independent slurry tank outside the tower) to realize the PH partition of the slurry, which satisfies the alkaline slurry and oxidation crystallization reaction for SO2 absorption respectively. acid slurry requirements. Increasing the number of spraying layers increases the number of slurry circulating pumps and the height of the absorption tower; the series connection of two towers not only increases the number of absorption towers and supporting equipment, but also greatly increases the area occupied by the system, which will lead to a decrease in construction and operating costs. improve. Therefore, the inventor has made further research on this, and developed a reciprocating double-zone spray absorption tower, and this case results from this.

Utility model content

The purpose of the utility model is to provide a reciprocating double-zone spray absorption tower, which greatly improves the SO2 removal efficiency under the premise of satisfying CaSO3 oxidation and gypsum crystallization.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A reciprocating double-zone spray absorption tower, including a cylinder body, the cylinder body is divided into an L absorption zone and an H absorption zone through an absorption zone partition, and a number of sprays are respectively arranged in the L absorption zone and the H absorption zone. layer, the L absorption zone and the H absorption zone correspond to the L slurry tank area and the H slurry tank area respectively, the spray layer of the L absorption zone draws slurry from the L slurry tank area through a circulating pump, and the H absorption zone The spray layer draws the slurry from the H slurry tank area through the circulation pump.

Further, the upper part of the L absorption zone is provided with an inlet flue, and the upper part of the H absorption zone is provided with an outlet flue.

Further, a smoke deflector is arranged between the outlet flue and the H absorption area, and a mist eliminator is arranged on the smoke deflector.

Further, pulse suspension devices and oxidation air pipe networks are provided at the bottom of the L slurry pool area and the H slurry pool area.

Further, the spraying direction of the spraying layer in the L absorption zone is upward, and the spraying direction of the spraying layer in the H absorption zone is downward.

After adopting the above scheme, the utility model has the following advantages compared with the prior art:

The flue gas and slurry dual partitions are realized in one absorption tower, and the SO2 removal efficiency is greatly improved under the premise of satisfying CaSO3 oxidation and gypsum crystallization.

Description of drawings

Fig. 1 is the schematic diagram of the utility model;

Label description

Cylinder 1, absorption zone partition 2, L absorption zone 3, H absorption zone 4, spray layer 5,

L slurry pool area 6, H slurry pool area 7, circulation pump 8, inlet flue 9, outlet flue 10,

Smoke deflector 11, pulse suspension pump 12, oxidation blower 13.

Detailed ways

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

As shown in the figure, a reciprocating double-zone spray absorption tower includes a cylinder body 1, and the cylinder body 1 is divided into an L absorption zone 3 and an H absorption zone 4 through an absorption zone partition 2, and the L absorption zone 3 and the H absorption zone The lower part of area 4 corresponds to the L slurry pool area 6 and the H slurry pool area 7, which are used to store the absorbent required for absorbing SO ₂ - limestone slurry and the by-products of calcium sulfite, calcium sulfate and gypsum slurry generated by the reaction. The slurry pool area Separated by the pulp tank partition, the liquid level in the H pulp tank area 7 is not actively controlled, it can overflow the pulp tank partition and flow into the L pulp tank area 6 autonomously, and the L pulp tank area 6 controls the liquid level below the level through the efflux pump The height of the pulp tank partition is about 1m to maintain a constant liquid level difference in the L and H pulp tank areas 7. A pulse suspension device is installed at the bottom of the two slurry tank areas, and the pulse agitation of the pulse suspension pump 12 keeps the solid components in the slurry from depositing; at the same time, an oxidation air pipe network is provided, and the air is continuously blown in through the external oxidation fan 13 to force _Oxidizes calcium sulfite generated by the SO2 absorption reaction.

The middle part of the absorption tower is the absorption zone, which is equally divided into the L absorption zone 3 and the H absorption zone 4 through the absorption zone separator 2, corresponding to the L slurry tank zone 6 and the H slurry tank zone 7 respectively. The lower part of the L absorption zone 3 is provided with two or more spray layers 5, and the spraying direction is upward; the upper part of the H absorption zone 4 is provided with two or more layers of spray layers 5, and the spraying direction is downward. The slurry circulation pump 8 provided outside the tower extracts the slurry from the L slurry pool area 6 and the H slurry pool area 7 and transports it to the spray layer 5 in the corresponding absorption area to wash the flue gas. Fall to the corresponding L pulp pool area 6, H pulp pool area 7.

The upper part of the absorption tower is a defogging area, in which a flue gas deflector 11 is installed, and two-stage or three-stage plate type or roof type mist eliminators are installed.

When working, the raw flue gas enters the absorption tower from the inlet flue gas, runs from top to bottom in the L absorption zone 3, and contacts and collides with the slurry sprayed upwards in countercurrent, and absorbs and reacts to remove most of the SO ₂ ; After the absorption zone 3, it turns back and runs from bottom to top in the H absorption zone 4. It contacts and collides with the downwardly sprayed slurry to undergo an absorption reaction to remove residual SO ₂ ; the flue gas will entrain a small amount of liquid in the process of spraying and washing. After passing through the spray layer 5 in the H area, it enters the expansion section of the cylinder body 1. At this time, the flue gas flow rate drops rapidly to 50% of the original flow rate. The flue gas enters the demister and is adsorbed during physical impact, and the clean flue gas is discharged through the outlet flue 10 .

_The limestone slurry consumed by absorbing SO2 is replenished to the H slurry tank area 7 through the pipeline, and further replenished to the L slurry tank area 6 through the overflow part. By adjusting the amount of slurry, the pH value of the slurry in the H slurry tank is controlled at 6~ In the range of 6.5, the pH value of the slurry in the L slurry area is kept in the range of 5.5 to 5.8, and the further absorption of SO2 is realized through the high pH value slurry spraying in the H spray area, and the desulfurization efficiency is improved _; the low pH value slurry in the L slurry tank area 6 Oxidation of calcium sulfite and crystallization of gypsum are realized.

The absorption tower body 1, the inlet flue 9, and the outlet flue 10 can be made of carbon steel-lined glass flakes; Made of other metal materials resistant to at least 20,000ppm Cl-corrosion; pulse suspension device, oxidizing air pipe network, spray layer 5 in L area, and spray layer 5 in H area can be made of glass fiber reinforced plastic or other metal materials resistant to at least 20,000ppm Cl- corrosion Production; the demister is made of PP material.

Above-mentioned is only the concrete embodiment of the present utility model, and all the words such as " up, down, left, right, middle " involved in the present utility model are only used for reference, are not absolutely limited, all utilize the present utility model to carry out Non-substantial changes shall all be acts of violating the protection scope of the present utility model.

Claims (2)

1. a kind of reciprocating two-region spray absorber, it is characterised in that：Including cylinder, pass through uptake zone partition board point in the cylinder For the uptake zones L and the uptake zones H, several spraying layers, the uptake zones L and H are respectively arranged in the uptake zones L and the uptake zones H L stock tanks area and H stock tanks area are corresponded to respectively below uptake zone, and the spraying layer of the uptake zones L is taken out by circulating pump from L stock tanks area Slurries, the spraying layer of the uptake zones H are taken to extract slurries from H stock tanks area by circulating pump, the uptake zones L top is provided with Gas approach, the uptake zones H top are provided with exhaust pass, smoke deflector are provided between the exhaust pass and the uptake zones H, Demister is provided on the smoke deflector, L stock tanks area and H stock tanks area bottom are provided with pulse suspension device and oxidation Air pipe network.

2. a kind of reciprocating two-region spray absorber according to claim 1, it is characterised in that：In the uptake zones L Spraying layer spray direction is upward, and the spraying layer spray direction in the uptake zones H is downward.