CN107261772A - A kind of method and device for being used to gather dust with purification containing volatility valuable element gas - Google Patents

Abstract

The present invention discloses a kind of method and device for being used to gather dust with purification containing volatility valuable element gas, gas liquid mixture is entered by the gas feed on middle part tower body top, tangential motion on the inside of along outer tower, under the influence of centrifugal force, absorbed dust etc. can get rid of the inner wall surface of outside tower, and gone downstream in the presence of spiral guide plate, finally flow into the bottom tower body；Absorbing liquid is entered by absorbing liquid import, spray to each spherical sieve tray top absorbing liquid and by bottom tower body go up Lai gas mixing；Mixed gas enters top tower body and carries out gas-liquid separation, and the liquid after separation flows into bottom tower body along inner cylinder；Gas is discharged.The present invention has the advantages that absorptivity is high, energy consumption is relatively low, simple in construction, easily overhaul, and the rate of recovery for valuable element can reach more than 98%；Corresponding pernicious gas can be removed by configuring corresponding elution absorbing liquid, absorptivity can reach more than 96%.

Description

A method and device for dust collection and purification of gas containing volatile valuable elements

technical field

The patent of the invention belongs to the technical field of gas purification treatment, and specifically relates to a method and device for dust collection and purification of gas containing volatile valuable elements.

Background technique

In the process of industrial production, a lot of industrial waste gas is usually produced, and the discharged waste gas contains dust, SO ₂ , NOx, HF, CO ₂ and other components; some processes will leave volatile valuable elements in the flue gas, If these waste gases are not effectively treated and discharged directly, it will cause serious environmental pollution and waste of resources. In order to meet the requirements of environmental protection, these exhaust gases should be treated and discharged after meeting the emission standards.

There are usually dry and wet methods for the treatment of industrial waste gas. Dry dust removal is difficult to recover volatile valuable elements, while large-scale industrial devices generally use wet methods. The more common wet absorption and purification devices have their own advantages and disadvantages. The disadvantages mainly include low absorption rate, poor effect, "dead zone" and high equipment.

Contents of the invention

For solving the problems of the technologies described above, the object of the present invention is to provide a kind of efficient method and device, and concrete technical scheme is as follows:

A method for dust collection and purification of gas containing volatile valuable elements. The gas-liquid mixture enters from the gas inlet in the upper part of the middle tower, moves along the tangent line inside the outer tower, and under the action of centrifugal force, the absorbed dust, etc. It will be thrown to the inner wall surface of the outer tower, and flow down under the action of the spiral guide plate, and finally flow into the lower tower body; the absorption liquid enters from the absorption liquid inlet, and sprays the absorption liquid on the upper part of each spherical sieve plate It is mixed with the gas rising from the lower tower body; the mixed gas enters the upper tower body for gas-liquid separation, and the separated liquid flows into the lower tower body along the inner cylinder; the gas is discharged.

The invention further discloses a device for realizing the method, including an upper tower body, a middle tower body, and a lower tower body; the middle tower body is a sleeve-type double tower structure, including an inner tower and an outer tower; the inner tower and the outer tower A spray-type spiral guide plate is set in the gap between them, the gas inlet is set on the upper end of the outer tower, and the direction of the gas inlet is the tangential direction of the inner wall of the outer tower; a sieve plate is arranged in the inner tower, and a The absorption liquid inlet; the upper tower body is equipped with a gas-liquid separation plate, the lower tower body is equipped with an absorption liquid water tank, and the upper tower body and the lower tower body are connected through the inner tower.

The sieve plate is a spherical sieve plate.

The advantages of the present invention are: the present invention has the advantages of high absorption rate, low energy consumption, simple structure, easy maintenance, etc., and overcomes the "dead zone" existing in common wet dust removal (vertical cyclone water film dust removal and spray dust removal) , high equipment, low absorption rate, poor effect and other shortcomings. The recovery rate of valuable elements in the patent of the present invention can reach more than 98%; industrial waste gas containing harmful gases can be removed, such as: SO ₂ , NOx, and corresponding harmful gases can be removed by configuring corresponding rinsing and absorbing liquids. The removal rate can reach more than 96%.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the dust collection and purification device;

Figure 2 is a schematic diagram of the layout of the air inlet;

Fig. 3 is the schematic diagram of spherical sieve plate;

Figure 4 is a structural schematic diagram of the inner and outer towers and their interlayers.

In the figure, 1 is the upper tower body, 2 is the absorption liquid inlet, 3 is the middle tower body, 4 is the lower tower body, 5 is the outer tower, 6 is the spiral guide plate, 7 is the inner tower, 8 is the spherical sieve plate, 9 For gas inlet, 10 is for gas outlet.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

The mixture of gas and absorption liquid containing volatile valuable elements enters the gap between the inner tower 7 and the outer tower 5 from the gas inlet 9 on the upper part of the middle tower body 3, and spirals downward under the guidance of the spray-type spiral guide plate, and the smoke and dust The harmful gas is absorbed by the absorption liquid in the gap between the outer tower 7 and the inner tower 5, and the first absorption and purification are completed; after the gas-liquid mixture flows into the lower tower body 4, the liquid flows out from the drain, and the gas rises upward. The absorption liquid flowing in from the absorption liquid inlet 2 converges at the spherical sieve plate 8, and forms a vortex boiling state under each small spherical surface of the spherical sieve plate 8, completing the second absorption and purification; after the second absorption The gas enters the upper tower body 1, and the gas-water separation is completed in the upper tower body 1. The gas is discharged from the gas outlet 10 at the top, and the absorption liquid flows into the lower tower body 4 through the inner cylinder 7, and is discharged from the lower tower body for treatment.

The gas inlet 9 is arranged along the tangent direction of the upper part of the middle tower body 3. The purpose is that after the gas and liquid are mixed, they will move along the tangent line inside the outer tower under the action of pressure. Under the action of centrifugal force, the absorbed dust will be thrown towards the outer tower. The surface of the inner wall of the cylinder, and flows down, and finally flows into the lower tower body 4, that is, the absorption liquid tank; since the gas enters the tower tangentially and moves circularly along the inner wall of the outer cylinder, the cross-section of the middle tower body The center forms a "dead zone", so a multi-layer spherical sieve plate tower is set in the center area, making full use of the space inside the tower to form a reasonable structure composed of inner and outer towers. The spherical sieve plate in the central area is larger than the opening ratio of the flat sieve plate, and its gas flux is large, which can form a boiling drop mist area, which absorbs the dust and harmful gas components of the gas, and has good efficiency.

The gap between the inner and outer towers of the above-mentioned equipment is equipped with a spray-type spiral guide plate, which solves the problem of spraying the absorption liquid in the gap, and at the same time plays a role in guiding the gas, increasing the residence time of the gas in the tower, that is, improving the absorption. Rate.

The spray-type spiral guide plate means that many small holes are set on the guide plate. When the gas and liquid flow through the guide plate, a part of the liquid falls from the small holes and mixes with the rising gas to form a spray-like mixture. This structure increases the gas-liquid mixing area, so the recovery effect of harmful gas is better.

The air velocity v ₁ of the inner tower is generally 1-1.5m/s. In order to ensure that the gas processing time in the inner tower is more than 3s, the height H ₁ of the inner tower should be greater than 4.5m. height to diameter ratio Generally in the range of 4 to 7. Diameter D1 is determined by empirical formula, as follows:

In the formula, Q is the gas processing capacity, m ³ /h.

The cross-sectional velocity v ₂ of the external tower is generally 4-6m/s in the operating state. The gas Q entering from the outer tower all enters the inner tower, so the distance S between the inner tower and the outer tower can be determined. Under the unit height h (1m), the expression of the gas handling capacity Q is as follows:

Q＝h·S·v ₂ (2)

Simultaneously with:

Q＝900πv ₁ D ₁ ² (3)

This gives the distance S between the inner tower and the outer tower:

Then the outer tower diameter D ₂ is obtained:

D ₂ =D ₁ +2S (5).

Claims (3)

1. a kind of method for being used to gather dust with purifying containing volatility valuable element gas, it is characterised in that：Gas liquid mixture by The gas feed on middle part tower body top enters, along outer tower inner side tangential motion, under the influence of centrifugal force, absorbed dust etc. The inner wall surface of outside tower can be got rid of, and is gone downstream in the presence of spiral guide plate, the bottom tower body is finally flowed into；Absorb Liquid is entered by absorbing liquid import, spray to each spherical sieve tray top absorbing liquid with by bottom tower body go up Lai gas mix Close；Mixed gas enters top tower body and carries out gas-liquid separation, and the liquid after separation flows into bottom tower body along inner cylinder；Gas is arranged Put.

2. a kind of device for realizing claim 1 methods described, it is characterised in that：Including top tower body, middle part tower body, lower tower Body；The middle part tower body is telescopic Double-Tower Structure, including inner tower and outside tower；Spray is provided with gap between Nei Ta and outer tower Pouring formula spiral guide plate, gas feed is set in the upper end of outer tower, and the direction of gas feed is the tangential direction of outer inner wall of tower； Sieve plate is disposed with interior tower, the top of each sieve plate sets absorbing liquid import；Top tower body sets gas-liquid separation plate, bottom tower body Absorbing liquid tank is set, and top tower body is connected with bottom tower body by interior tower.

3. device according to claim 2, it is characterised in that：The sieve plate is spherical sieve tray.