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System and method for removing pollutants in flue gas collected from sodium sulfide hot-melting tank

A sodium sulfide and pollutant technology, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of sodium sulfide environmental pollution and potential safety hazards, and achieve the effect of ensuring clean emissions and eliminating potential safety hazards

Pending Publication Date: 2021-03-16
TONGLING NON FERROUS METAL GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in order to solve the safety and environmental protection problems of flue gas pollutants (alkali mist, hydrogen sulfide gas, dust and water vapor) escaping from the hot-melt tank in the production process of sodium sulfide, a ring set for removing sodium sulfide hot-melt tank is provided. A method for pollutants in flue gas to improve the safety of sodium sulfide production
[0006] A lower concentration of sodium hydroxide solution is selected as the absorbent, and the reverse spraying method of strong gas-liquid contact is adopted, and the principle of inertial sedimentation technology of liquid droplets and dust is used to remove the flue gas pollutants escaping from the sodium sulfide hot melting tank, and solve the problem of Problems of environmental pollution and potential safety hazards in the hot melting process of sodium sulfide

Method used

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  • System and method for removing pollutants in flue gas collected from sodium sulfide hot-melting tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: the removal method of the pollutant in the ring collection flue gas

[0065] Step 1: Set the gas collecting hood 1 on the sodium sulfide hot melting tank, utilize the suction of the induced draft fan 2 to make the vacuum (or negative pressure) in the area of ​​the gas collecting hood edge reach 100Pa, and realize the ring on the hot melting tank All the collected flue gas is sucked and transported into the flue gas scrubber 3;

[0066] Step 2: The ring-collecting flue gas containing pollutants enters the reverse nozzle 11 of the washing tower from top to bottom, and the sodium hydroxide circulating liquid is pressurized by the lye circulating pump 7 and sprayed out by the atomizing nozzle 12. Under pressure, the cone-shaped water mist curtain is formed through the centrifugal rotation inside the nozzle. The atomized circulating fluid rises to the highest point of the reverse nozzle 11, and then falls. The sodium circulating fluid absorbs hydrogen sulfide ...

Embodiment 2

[0071] The flue gas conditions entering the scrubber are as follows: flue gas flow rate 45000Nm 3 / h, the dust concentration in the flue gas is 65mg / Nm 3 , the hydrogen sulfide concentration in the flue gas is 15mg / Nm 3 , the moisture in the flue gas is 48g / Nm 3 , the flue gas temperature is 65°C, and the circulating liquid spray volume of the scrubber is 230m 3 / h, the pH of the circulating liquid is controlled at 7.2±0.5, and the density of the circulating liquid in the scrubber is about 1.03t / m 3 .

[0072] Remove through the steps in the above-mentioned embodiment 1.

[0073] After treatment, the detection data of the exhausted flue gas is: the flow rate is 45200Nm 3 / h, the dust concentration in the flue gas is 5mg / Nm 3 , the concentration of hydrogen sulfide in the flue gas is 3mg / Nm 3 , the moisture in the flue gas is 50g / Nm 3 , the flue gas temperature is 45°C.

Embodiment 3

[0075] The flue gas conditions entering the scrubber are as follows: flue gas flow rate 35000Nm 3 / h, the dust concentration in the flue gas is 80mg / Nm 3 , the hydrogen sulfide concentration in the flue gas is 21mg / Nm 3 , the moisture in the flue gas is 52g / Nm 3 , the flue gas temperature is 72°C, and the circulating liquid spray volume of the scrubber is 210m 3 / h, the pH of the circulating liquid is controlled at 7.5±0.5, and the density of the circulating liquid in the scrubber is about 1.05t / m 3 .

[0076] Remove through the steps in the above-mentioned embodiment 1.

[0077] After treatment, the detection data of the exhausted flue gas is: the flow rate is 35600Nm 3 / h, the dust concentration in the flue gas is 3mg / Nm 3 , the hydrogen sulfide concentration in the flue gas is 2mg / Nm 3 , the moisture in the flue gas is 46g / Nm 3 , the flue gas temperature is 43°C.

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Abstract

The invention relates to a system and a method for removing pollutants in flue gas collected from a sodium sulfide hot-melting tank. Flue gas collected from a sodium sulfide hot-melting tank is collected and then conveyed to a flue gas washing tower, a washing solution is in strong and sufficient contact with the flue gas in a reverse spray pipe of the washing tower, so that the pollutants in theflue gas are absorbed or dissolved by a circulating solution, the washed flue gas is sequentially subjected to settling separation in a gas-liquid separation area and inertia separation by a baffle plate and a compound baffle plate to remove particles (containing water drops and dust) entrained in the flue gas, so that clean emission of tail gas is realized. By adopting the method and the system provided by the invention, the pollutants in flue gas collected in the sodium sulfide hot-melting tank can be efficiently removed, the obvious defects of the traditional removal device are overcome, the field environment of sodium sulfide hot-melting operation is improved, the safety of sodium sulfide hot-melting operation is improved, and up-to-standard emission of the flue gas pollutants is realized.

Description

technical field [0001] The invention relates to the treatment of flue gas pollutants (alkali mist, hydrogen sulfide gas, dust and water vapor) collected in a heat-dissolving tank, especially to a heat-dissolving tank for industries such as sodium sulfide and sodium hydrogen sulfide by using alkali absorption technology A treatment method and system for ring-collecting flue gas pollutants. Background technique [0002] The alkalization and soaking of clinker in the production process of sodium sulfide are necessary processes in the production process of sodium sulfide. In the production process of sodium sulfide, the clinker (or black ash) discharged from the caustic soda sulfide (sodium sulfide) calciner is generally cooled naturally to 700-750°C, and then sent to the hot melting tank of sodium sulfide, at the same time After adding the conversion agent, it is soaked and dissolved. The flue gas and water vapor escaped from the hot melt tank are collected and sent to the abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14B01D53/26B01D47/06
CPCB01D53/18B01D53/1468B01D53/263B01D47/06
Inventor 吴炳智左永伟唐雁朱世银杨宏陈家欢周枫蔡英健
Owner TONGLING NON FERROUS METAL GROUP CORP
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