CN115400561B - A desulfurization tower used in calcium oxide production - Google Patents

Abstract

The invention discloses a desulfurization tower used in calcium oxide production, which includes a tower body. A desulfurization slurry pool is provided at the bottom of the tower body. A smoke inlet located above the desulfurization slurry pool is provided on one side of the tower body. The top of the tower body is provided with a desulfurization slurry pool. At the air outlet, the tower body is also provided with a draft hood located between the smoke inlet and the gas outlet. The draft hood is provided with a desulfurization spray pipe, and the desulfurization spray pipe is connected to a circulation pipe connected to the desulfurization slurry pool; The draft hood includes a bottom cone-shaped hood that is fixed in the tower body and is small at the top and large at the bottom. There are liquid outlets on the front and rear sides of the bottom cone-shaped hood. There is an air guide duct above the bottom cone-shaped hood, and there is an air guide duct above it. The upper and lower cone-shaped fixing parts are large and small. There is an annular smoke outlet between the conical fixing part and the tower body. The desulfurization spray pipe is fixed on the side wall of the conical fixing part; the side wall of the air guide pipe is provided with Air outlet. The invention has the characteristics of effectively improving the spraying effect.

Description

A desulfurization tower used in calcium oxide production

Technical field

The invention relates to a desulfurization tower, in particular to a desulfurization tower used in calcium oxide production.

Background technique

The process of preparing limestone into calcium oxide by calcining method generally includes the following steps: first coarsely crush the limestone to 150mm, and screen out the fine residue below 30-50mm; then add the screened limestone and fuel from the top of the kiln in a regular and quantitative manner. In the kiln, it is calcined at 900-1200℃, and then cooled to obtain the finished product. During the calcination process, limestone will produce carbon dioxide, and the combustion of coal or coke will produce flue gas (kiln gas) containing sulfur and nitrate. The flue gas needs to be desulfurized and denitrified before it can be discharged into the air. Existing desulfurization towers generally use the wet desulfurization method, that is, the flue gas is desulfurized by spraying desulfurization slurry in the spray tower. The spray angle of this method is limited, so that part of the flue gas is not sprayed. After treatment, it will be discharged into the atmosphere, resulting in unsatisfactory final desulfurization effect and causing environmental pollution. Therefore, the existing technology has the problem of unsatisfactory desulfurization effect.

Contents of the invention

The object of the present invention is to provide a desulfurization tower used in calcium oxide production. The invention has the characteristics of effectively improving the spraying effect.

The technical solution of the present invention: a desulfurization tower used in calcium oxide production, including a tower body. A desulfurization slurry pool is provided at the bottom of the tower body. A smoke inlet is located above the desulfurization slurry pool on one side of the tower body. The top of the tower body It is equipped with an air outlet, and the tower body is also equipped with a draft hood located between the smoke inlet and the gas outlet. The draft hood is equipped with a desulfurization spray pipe, and the desulfurization spray pipe is connected to a circulation pipe connected to the desulfurization slurry pool; The draft hood includes a bottom cone-shaped hood that is fixed in the tower body and is small at the top and large at the bottom. Liquid outlets are provided on the front and rear sides of the bottom cone-shaped hood. An air guide duct is provided above the bottom cone-shaped hood. There is a cone-shaped fixing piece with a large upper part and a small one at the bottom. An annular smoke outlet is provided between the cone-shaped fixing part and the tower body. The desulfurization spray pipe is fixed on the side wall surface of the cone-shaped fixing part; the side wall surface of the air guide pipe Equipped with air outlet.

In the aforementioned desulfurization tower used in calcium oxide production, the desulfurization spray pipes include multiple groups of annular spray pipes distributed in a stepped manner, and the annular spray pipes are evenly distributed with nozzles.

In the aforementioned desulfurization tower used in calcium oxide production, there is an annular desulfurization object distributed downwardly inclined and corresponding to the position of the annular smoke outlet above the draft hood, and the annular desulfurization object is filled with desulfurization particles. , and the surface of the annular desulfurization device is provided with ventilation holes; the upper end of the tapered fixing member is also provided with an annular air guide plate parallel to the annular desulfurization device.

In the aforementioned desulfurization tower used in calcium oxide production, a rotating rod is provided in the middle above the draft hood. A set of annularly distributed rotating desulfurization boxes are provided on the rotating rod, and desulfurization particles are provided in the rotating desulfurization box. , the surface of the rotary desulfurization box is provided with exchange through holes; the outer end of the rotating rod is connected to a drive motor.

In the aforementioned desulfurization tower used in calcium oxide production, a filter is provided in the middle of the desulfurization slurry pool, and a circulation pipe is provided on the tower body above the filter net; drainage is provided on the front and rear walls of the tower. cavity, the bottom outlet of the drainage cavity is located below the filter.

In the aforementioned desulfurization tower used in calcium oxide production, the drainage cavity corresponds to the liquid outlet.

Compared with the prior art, the present invention sets an air induction hood composed of a bottom conical hood, an air guide duct, and a conical fixing piece in the tower body, and uses a desulfurization system composed of multiple sets of annular spray pipes distributed in a stepped manner. The spray pipe is arranged on the outer wall surface of the cone-shaped fixing member of the draft hood, which can effectively expand the spray angle and achieve all-round spray, thereby effectively improving the spray effect. At the same time, the present invention also provides an annular desulfurization device that matches the annular smoke outlet and a rotatable desulfurization box above the draft hood to further desulfurize the flue gas, thereby effectively improving desulfurization. Effect; Moreover, the rotation of the rotary desulfurization box can also disturb the flue gas, thereby further improving the uniformity of desulfurization. To sum up, the present invention has the characteristics of effectively improving the spraying effect.

In addition, the present invention can recover the sprayed desulfurization slurry below the filter screen of the desulfurization slurry tank by cooperating between the bottom conical cover and the liquid outlet, so that the slurry can be filtered and the circulation effect can be improved; and It can also effectively reduce the emission of slurry carried by flue gas and reduce the loss of slurry.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a structural view of the draft hood;

Figure 3 is a top view of the bottom conical cover.

The marks in the drawings are: 1-tower body, 2-desulfurization slurry pool, 3-smoke inlet, 4-air outlet, 5-draft hood, 6-desulfurization spray pipe, 7-circulation pipe, 501-bottom Conical cover, 502-liquid outlet, 503-air guide duct, 504-conical fixing piece, 505-annular smoke outlet, 506-air outlet, 507-annular desulfurization storage object, 508-annular air guide plate, 8 -Rotating rod, 9-rotating desulfurization box, 10-filter, 11-drainage chamber.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples, but this does not serve as a basis for limiting the present invention.

Example. A desulfurization tower used in calcium oxide production is composed as shown in Figures 1 to 3. It includes a tower body 1. A desulfurization slurry pool 2 is provided at the bottom of the tower body 1. A desulfurization slurry pool is located on one side of the tower body 1. There is a smoke inlet 3 above 2, and an air outlet 4 is provided on the top of the tower body 1. The tower body 1 is also provided with a draft hood 5 located between the smoke inlet 3 and the air outlet 4. The draft hood 5 is provided with a desulfurization Spray pipe 6, the desulfurization spray pipe 6 is connected to the circulation pipe 7 connected to the desulfurization slurry pool 2; the draft hood 5 includes a bottom conical hood 501 fixed in the tower body 1 and with a small top and a large bottom. Liquid outlets 502 are provided on the front and rear sides of the cone-shaped cover 501. An air guide duct 503 is provided above the bottom cone-shaped cover 501. An upper and lower conical fixing piece 504 is disposed above the air duct 503. The conical fixing piece 504 An annular smoke outlet 505 is provided between the tower 1 and the desulfurization spray pipe 6. The desulfurization spray pipe 6 is fixed on the side wall of the cone-shaped fixture 504; the air guide 503 is provided with an air outlet 506 on the side wall.

The desulfurization spray pipe 6 includes multiple groups of annular spray pipes distributed in a stepped manner, and nozzles are evenly distributed on the annular spray pipes.

An annular desulfurization device 507 is provided above the draft hood 5 and is distributed obliquely downward and corresponding to the position of the annular smoke outlet 505. The annular desulfurization device 507 is filled with desulfurization particles, and the surface of the annular desulfurization device 507 is provided with Ventilation holes; the upper end of the tapered fixing member 504 is also provided with an annular air guide plate 508 parallel to the annular desulfurization device 507.

There is a rotating rod 8 in the middle above the draft hood 5, and a set of annularly distributed rotating desulfurization boxes 9 are arranged on the rotating rod 8. The rotating desulfurization boxes 9 are equipped with desulfurization particles, and the surface of the rotating desulfurization box 9 is provided with Exchange through holes; the outer end of the rotating rod 8 is connected to a drive motor.

A filter 10 is provided in the middle of the desulfurization slurry tank 2, and a circulation pipe 7 is provided on the tower 1 above the filter 10; a drainage chamber 11 is provided on the front and rear side walls of the tower 1, and the bottom of the drainage chamber 11 The outlet is located below the filter 10.

The drainage cavity 11 corresponds to the liquid outlet 502 .

The desulfurization slurry tank is also connected to a desulfurization slurry replenishment pipe and a waste liquid recovery pipe.

The working process of the present invention: flue gas enters the tower body through the smoke inlet, then enters the bottom conical cover, flows out from the air outlet of the air guide duct to the spray cavity between the bottom conical cover and the conical fixing piece, After being sprayed by the stepped annular spray pipes in sequence, the flue gas flows out from the annular smoke outlet. After a part of the flue gas is desulfurized by the desulfurization particles in the annular desulfurization device, it is discharged from the outlet to the external environment or enters the In the next treatment process, another part of the flue gas is guided by the annular air guide plate, contacts the desulfurization particles in the rotary desulfurization box, and is discharged from the air outlet. The sprayed desulfurization slurry flows back to the bottom of the filter screen of the desulfurization slurry pool through the liquid outlet and the drainage cavity. After being filtered, it is recirculated through the circulation pipe.

Claims (1)

1. A desulfurization tower used in calcium oxide production, characterized by: including a tower body (1), a desulfurization slurry pool (2) is provided at the bottom of the tower body (1), and a desulfurization slurry pool (2) is provided on one side of the tower body (1). There is a smoke inlet (3) located above the desulfurization slurry pool (2). There is an air outlet (4) on the top of the tower body (1). There are also smoke inlets (3) and air outlets (4) located in the tower body (1). 4), the draft hood (5) is provided with a desulfurization spray pipe (6), and the desulfurization spray pipe (6) is connected to a circulation pipe (2) connected to the desulfurization slurry pool (2). 7); The draft hood (5) includes a bottom cone-shaped hood (501) that is fixed in the tower body (1) and is small at the top and large at the bottom. Liquid outlets are provided on the front and rear sides of the bottom cone-shaped hood (501). (502), there is an air guide duct (503) above the bottom cone-shaped cover (501), and there is a cone-shaped fixing piece (504) with a large top and a small bottom set above the air duct (503). The cone-shaped fixing piece (504) An annular smoke outlet (505) is provided between the tower body (1), and the desulfurization spray pipe (6) is fixed on the side wall surface of the tapered fixture (504); the air guide pipe (503) is provided with a side wall surface There is an air outlet (506); the desulfurization spray pipe (6) includes a plurality of sets of annular spray pipes distributed in a stepped manner, and nozzles are evenly distributed on the annular spray pipes; the upper part of the draft hood (5) is provided with a direction An annular desulfurization device (507) is distributed obliquely downward and corresponds to the position of the annular smoke outlet (505). The annular desulfurization device (507) is filled with desulfurization particles, and the surface of the annular desulfurization device (507) is provided with ventilation holes. ; The upper end of the tapered fixing member (504) is also provided with an annular air guide plate (508) parallel to the annular desulfurization device (507); a rotating rod (8) is provided in the middle above the air induction hood (5) ), the rotating rod (8) is provided with a set of annularly distributed rotary desulfurization boxes (9), the rotary desulfurization box (9) is provided with desulfurization particles, and the surface of the rotary desulfurization box (9) is provided with exchange through holes; The outer end of the rotating rod (8) is connected with a driving motor; a filter (10) is provided in the middle of the desulfurization slurry pool (2), and a circulation pipe (7) is provided on the tower (1) above the filter (10) ); the front and rear side walls of the tower body (1) are provided with drainage chambers (11), and the bottom outlet of the drainage chamber (11) is located below the filter screen (10); the drainage chamber (11) and the liquid outlet (502 )Corresponding.