CN215428190U

CN215428190U - Titanium white powder production calcination tail gas processing apparatus

Info

Publication number: CN215428190U
Application number: CN202121400767.5U
Authority: CN
Inventors: 王东梁; 王博文
Original assignee: Gansu Dongfang Titanium Industry Co Ltd
Current assignee: Gansu Dongfang Titanium Industry Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-01-07
Anticipated expiration: 2031-06-23

Abstract

The utility model relates to a titanium dioxide production calcination tail gas treatment device, which is characterized in that: a discharge flue is arranged at the top of the desulfurizing tower, a water outlet pipe at the bottom of the washing tank is connected with a spray pipe through a spray pump, the spray pipe is respectively connected with a horizontal spray branch pipe and a vertical spray branch pipe, the pipe orifice of the horizontal spray branch pipe extends into the vertical flue, and the pipe orifice of the vertical spray branch pipe extends into the horizontal flue; and a plurality of carbide slag emulsion spraying branch pipes are arranged on the carbide slag emulsion pipe in parallel, and the carbide slag emulsion spraying branch pipes extend into the desulfurizing tower from the middle upper part of the desulfurizing tower. The tail gas dust content is reduced, the tail gas sulfur dioxide content is reduced by using the dilute alkali filtrate of the production line, the process flow is simple, and the energy conservation and consumption reduction are realized.

Description

Titanium white powder production calcination tail gas processing apparatus

Technical Field

The utility model belongs to the technical field of chemical production and environmental protection, and particularly relates to a titanium dioxide production calcination tail gas treatment device.

Background

In the production process of titanium dioxide, metatitanic acid filter cakes are calcined at high temperature in a rotary kiln, dehydration, desulfurization, crystal form conversion and ion growth are carried out, the generated titanium dioxide dust, sulfur dioxide and sulfur trioxide are subjected to electric precipitation to remove most of the titanium dioxide dust, then the titanium dioxide dust, sulfur dioxide and sulfur trioxide are subjected to spray cooling and dust removal by production water for a venturi tube, then the titanium dioxide dust, sulfur dioxide and sulfur trioxide enter a desulfurization tower to be subjected to forward contact spray desulfurization by using a waste product acetylene sludge emulsion, the desulfurized gas is further subjected to forward contact spray desulfurization by using sodium hydroxide alkali liquor through a washing tower, sulfur dioxide and sulfur trioxide are further removed, and the treated gas enters an electrostatic demister and is discharged into the atmosphere through a chimney under the driving of the negative pressure of a tail gas fan.

In the production process, the electrostatic dust collector of the calcination tail gas dust removal equipment runs for a long time, so that the dust deposition of a cathode plate and an anode plate is thick, corona discharge occurs, the dust removal efficiency is reduced, and the dust content needs to be reduced; the scaling of carbide slag emulsion incoming material pipeline inner wall is serious among the desulfurizing tower system, and carbide slag comes the material fewly, and desulfurizing tower circulating fluid reaches the little saturated state of saturation, leads to the desulfurization inefficiency, and sulfur dioxide, sulfur trioxide content rise, take place the environmental protection accident.

A large amount of recycled reclaimed water, tail gas regulating water alkali liquor and dilute alkali filtrate are generated in the production process of the titanium white industry, the reclaimed water and the tail gas regulating water alkali liquor are sprayed in a flue to catch and drip titanium dioxide dust in calcined tail gas and reduce the dust content, and the dilute alkali filtrate is sprayed in the flue in the forward direction with the tail gas generated by calcination to react, so that the contents of sulfur dioxide and sulfur trioxide are reduced; the calcined tail gas is sprayed by the reclaimed water in the flue, so that the dust content is reduced, and the purpose of reducing energy consumption is achieved.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a titanium dioxide production calcination tail gas treatment device.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a titanium white powder production calcines tail gas processing apparatus which characterized in that: the top of the desulfurizing tower is provided with a discharge flue, and the discharge flue is formed by connecting a top horizontal flue and a downward vertical flue; a washing tank is arranged below the opening of the vertical flue, a water outlet pipe at the bottom of the washing tank is connected with a water spraying pipe through a spraying pump, the water spraying pipe is respectively connected with a horizontal spraying branch pipe and a vertical spraying branch pipe, the pipe orifice of the horizontal spraying branch pipe extends into the vertical flue, and the pipe orifice of the vertical spraying branch pipe extends into the horizontal flue; the lower part of the desulfurizing tower is provided with a flue inlet; a plurality of carbide slag emulsion spraying branch pipes are arranged on the carbide slag emulsion pipe in parallel, and the carbide slag emulsion spraying branch pipes extend into the desulfurization tower from the middle upper part of the desulfurization tower; the outlet of the upper flue of the washing tank is connected with a washing tower, and the top of the washing tower is provided with a flue outlet.

The horizontal spraying branch pipe and the vertical spraying branch pipe are respectively and evenly provided with 3-4 nozzles in parallel, and the nozzles are respectively arranged at the pipe orifices of the horizontal spraying branch pipe and the vertical spraying branch pipe and are in a spiral structure.

And a liquid inlet at the top of the washing tank is connected with an alkali liquor pipe, a dilute alkali filtrate pipe and a middle water pipe. And (3) conveying the alkali liquor of the reclaimed water and the tail gas regulating water to a flue nozzle through a spray pump, capturing and dripping titanium dioxide dust in a flue in a forward direction, spraying for dedusting, and conveying the dilute alkali filtrate to the flue nozzle through the spray pump to remove sulfur dioxide and sulfur trioxide in the flue.

The bottom is equipped with the aeration pipe in the wash tank, and roots's fan is connected to the aeration pipe, and the effective stirring of gypsum sediment breast that brings to the negative pressure in the system is avoided the deposit in the wash tank bottom to the preparation of nonrust pipeline trompil of aeration pipe, blocks up the fluid-discharge pump inlet pipe.

And the drain pipe at the bottom of the washing tank is connected with an acid water neutralization system through a drain pump. Because the PH of the liquid discharged by the liquid discharge pump is more than 10, the acidic wastewater of a sewage treatment neutralization plant can be neutralized, so that the neutralized PH of the liquid is neutral, and the consumption of the carbide slag emulsion and the limestone emulsion which are used as raw and auxiliary materials for neutralization is reduced.

And an inlet pipeline of the spray pump is provided with a T-shaped filter. The sprayed gypsum residues are effectively filtered, and the blockage of the spiral throat of the nozzle is avoided.

And the lower part of the washing tank is also provided with a vent pipe.

And an inlet pipeline of the liquid discharge pump is provided with a T-shaped filter. The gypsum slag brought by negative pressure in the system is effectively filtered, and the blockage of the spiral throat of the nozzle is avoided.

The utility model has the beneficial effects that: the byproduct dilute alkali filtrate, tail gas regulating water alkali liquor and reclaimed water generated by the production line are used as raw materials, dust generated by calcining tail gas is captured and dripped, sulfur dioxide and sulfur trioxide are oxidized into sodium sulfate, the purposes of reducing tail gas dust and sulfur dioxide and realizing standard emission are achieved. The process is simple and practical, and the resource waste is reduced.

Drawings

FIG. 1 is a schematic view of the present invention;

in the figure: 1-a desulfurizing tower, 2-a discharge flue, 3-a washing tank, 4-a spray pump, 5-a spray pipe, 6-a horizontal spray branch pipe, 7-a vertical spray branch pipe, 8-a flue inlet, 9-a carbide slag emulsion pipe, 10-an alkali liquor pipe, 11-a dilute alkali filtrate pipe, 12-a reclaimed water pipe, 13-a liquid discharge pump, 14-a Roots blower, 15-an aeration pipe, 16-an emptying pipe, 17-a washing tower, 18-a flue outlet and a 19-T type filter.

Detailed Description

Embodiment 1, see fig. 1, a titanium dioxide production calcination tail gas processing apparatus, its characterized in that: the top of the desulfurizing tower 1 is provided with a discharge flue 2, and the discharge flue 2 is formed by connecting a top horizontal flue 21 and a downward vertical flue 22; a washing tank 3 is arranged below the mouth of the vertical flue 22, a water outlet pipe at the bottom of the washing tank 3 is connected with a water spraying pipe 5 through a spraying pump 4, the water spraying pipe 5 is respectively connected with a horizontal spraying branch pipe 6 and a vertical spraying branch pipe 7, the mouth of the horizontal spraying branch pipe 6 extends into the vertical flue 22, and the mouth of the vertical spraying branch pipe 7 extends into the horizontal flue 21; the lower part of the desulfurizing tower 1 is provided with a flue inlet 8; a plurality of carbide slag emulsion spraying branch pipes are arranged on the carbide slag emulsion pipe 9 in parallel and extend into the desulfurization tower 1 from the middle upper part of the desulfurization tower; the outlet of the upper flue of the washing tank 3 is connected with a washing tower 17, and the top of the washing tower 17 is provided with a flue outlet 18.

3-4 horizontal spray branch pipes 6 and vertical spray branch pipes 7 are uniformly arranged in parallel, nozzles are arranged at the pipe orifices of the horizontal spray branch pipes 6 and the vertical spray branch pipes 7, and the nozzle structures are spiral.

A liquid inlet at the top of the washing tank 3 is connected with an alkali liquor pipe 10, a dilute alkali filtrate pipe 11 and a water pipe 12.

An aeration pipe 15 is arranged at the bottom in the washing tank 3, and the aeration pipe 15 is connected with a Roots blower 14.

The drain pipe at the bottom of the washing tank 3 is connected with an acid water neutralization system through a drain pump 13.

And the inlet pipeline of the spray pump 4 and the inlet pipeline of the liquid discharge pump 13 are both provided with a T-shaped filter 19.

The lower part of the washing tank 3 is also provided with a vent pipe 16.

The working process is as follows: the electrostatic dust collector of the calcination tail gas dust removal equipment runs for a long time to cause the ash deposition of a cathode plate and an anode plate to be thick, corona discharge occurs, the dust removal efficiency is reduced, the dust content needs to be reduced, a manual valve of a reclaimed water pipe 12 and a manual valve of an alkali liquor pipe 10 are opened to feed solution into a washing tank 3, when the liquid level reaches a specified height, a Roots blower 14 carries out aeration treatment on the solution in the washing tank 3 through an emptying pipe, a spray pump 4 is opened to catch smoke dust in a flue 2 of a desulfurizing tower 1, a liquid discharge pump 13 is hung with high and low liquid levels to run in a linkage manner, and the sprayed waste water is discharged to a neutralization system. And ensuring that the pH value of the solution in the washing tank 3 is less than 7, corroding the pipeline in an acidic state, opening a manual valve of the alkali liquor pipe 10, and controlling the pH value through the opening degree of the valve.

In calcination tail gas desulfurization system, the inside scale deposit of carbide slag incoming material pipeline long-time operation pipe wall is serious, the carbide slag incoming material is few, desulfurizing tower circulating fluid reaches the saturated little saturated state, lead to desulfurizing tower desulfurization system desulfurization inefficiency, sulfur dioxide is high, need reduce sulfur dioxide content, the manual valve of well water pipe 12 is closed, stop giving washing tank 3 into the normal water, open the manual valve of diluted alkaline filtrate pipe 11, guarantee that the interior pH of washing tank 3 is greater than 10, the sulfur dioxide in sodium hydroxide and the tail gas in the diluted alkaline filtrate, sulfur trioxide down-flow contact, the abundant reaction generates sodium sulfite solution and sodium sulfate solution, the solution in the washing tank is replaced to the chain of height liquid level of flowing back pump 13, and discharge the waste water that has sprayed to neutralization acid water neutralization reaction, reach desulfurization effect.

In the whole process, the Roots blower 14 is normally opened, so that on one hand, the Roots blower plays a role of stirring, solid-phase substances and solution deposited at the bottom of the washing tank 3 are uniformly mixed, the replacement is convenient, and the emptying pipe 16 is not easy to block; on the other hand, unreacted sulfur dioxide and sulfur trioxide in the washing tank 3 are mixed in the spray liquid to fully react with sodium hydroxide in the dilute alkali filtrate of the washing salt, so that the desulfurization efficiency is improved, and the aims of desulfurization and dust removal are fulfilled.

Claims

1. The utility model provides a titanium white powder production calcines tail gas processing apparatus which characterized in that: the top of the desulfurizing tower (1) is provided with a discharge flue (2), and the discharge flue (2) is formed by connecting a top horizontal flue (21) and a downward vertical flue (22); a washing tank (3) is arranged below the opening of the vertical flue (22), a water outlet pipe at the bottom of the washing tank (3) is connected with a water spraying pipe (5) through a spraying pump (4), the water spraying pipe (5) is respectively connected with a horizontal spraying branch pipe (6) and a vertical spraying branch pipe (7), the pipe orifice of the horizontal spraying branch pipe (6) extends into the vertical flue (22), and the pipe orifice of the vertical spraying branch pipe (7) extends into the horizontal flue (21); the lower part of the desulfurizing tower (1) is provided with a flue inlet (8); a plurality of carbide slag emulsion spraying branch pipes are arranged on the carbide slag emulsion pipe (9) in parallel and extend into the desulfurization tower (1) from the middle upper part of the desulfurization tower; the flue outlet at the upper part of the washing tank (3) is connected with a washing tower (17), and the top of the washing tower (17) is provided with a flue outlet (18).

2. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: the horizontal spraying branch pipes (6) and the vertical spraying branch pipes (7) are all evenly provided with 3-4 nozzles in parallel, the pipe orifices of the horizontal spraying branch pipes (6) and the vertical spraying branch pipes (7) are all provided with nozzles, and the nozzle structures are spiral.

3. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: and a liquid inlet at the top of the washing tank (3) is connected with an alkali liquor pipe (10), a dilute alkali filtrate pipe (11) and a middle water pipe (12).

4. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: an aeration pipe (15) is arranged at the bottom in the washing tank (3), and the aeration pipe (15) is connected with a Roots blower (14).

5. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: and a drain pipe at the bottom of the washing tank (3) is connected with an acid water neutralization system through a drain pump (13).

6. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: and an inlet pipeline of the spray pump (4) is provided with a T-shaped filter (19).

7. The titanium dioxide production calcination tail gas treatment device of claim 1, which is characterized in that: and an emptying pipe (16) is also arranged at the lower part of the washing tank (3).

8. The titanium dioxide production calcination tail gas treatment device of claim 5, which is characterized in that: and an inlet pipeline of the liquid discharge pump (13) is provided with a T-shaped filter (19).