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Process and device for processing smoke containing sulfur dioxide and preparing solid ammonium sulfate

A technology of sulfur dioxide and ammonium sulfate, which is applied in the direction of ammonium sulfate, chemical instruments and methods, and the separation of dispersed particles, which can solve problems such as increased operating costs, unfavorable environmental protection, and increased ammonia escape.

Inactive Publication Date: 2010-06-30
BEIJING BOOTES ELECTRIC POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, ammonia is injected into the primary spray system, which will lead to an increase in the pH of the absorption liquid and increase the escape of ammonia, which is not conducive to environmental protection and increases operating costs.
[0011] The above-mentioned technical solutions have problems such as complicated process and high operating costs, which restrict the rapid development of ammonia-based flue gas desulfurization technology. Although many ammonia-based flue gas desulfurization devices have been in operation so far, the production of solid ammonium sulfate There are very few large-scale ammonia flue gas desulfurization devices

Method used

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  • Process and device for processing smoke containing sulfur dioxide and preparing solid ammonium sulfate
  • Process and device for processing smoke containing sulfur dioxide and preparing solid ammonium sulfate
  • Process and device for processing smoke containing sulfur dioxide and preparing solid ammonium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] Embodiment 1, the technical process and device structure adopted in this embodiment are as attached figure 1 shown.

[0115] Raw flue gas from the boiler with a flow rate of 100×10 4 N m 3 / h, the temperature is 150 degrees Celsius, and the sulfur dioxide content is 2000mg / Nm 3 , the dust concentration is 100mg / Nm 3 , enters from the original flue gas inlet in the middle of the absorption tower, then flows upwards, and undergoes countercurrent washing of two layers of slurry sprayed down, in which SO 2 into the slurry. The flow velocity of flue gas through the absorption tower is 3.5m / s. The washed flue gas is treated by the 3-layer horizontal demister at the top of the absorption tower, and the fine mist droplets entrained in the flue gas are removed, and then discharged from the system through the outlet at the top of the absorption tower. The temperature of the net flue gas discharged from the system is about 55 degrees, SO 2 The content is 100mg / Nm 3 , the d...

Embodiment 2

[0141] Embodiment 2, the technical process and device structure adopted in this embodiment are as attached figure 2 shown. This embodiment has many similarities with Embodiment 1, and only the differences from Embodiment 1 will be described below.

[0142] The original flue gas flow rate of this embodiment is 200×10 4 N m 3 / h, the temperature is 140 degrees Celsius, and the sulfur dioxide content is 4000mg / Nm 3 , there are 3 layers of spraying in the absorption tower, the flow velocity of the flue gas flowing through the absorption tower is 3.8m / s, the net flue gas temperature of the discharge system is about 48 degrees, SO 2 The content is 100mg / Nm 3 , equipped with 3 circulating pumps, the injection of oxidation air adopts the pipe network method, and the distance between the air outlet of the oxidation air pipe network and the liquid surface of the slurry tank of the absorption tower is 5.5m.

[0143] The spray layer of this embodiment includes 3 layers of spray lay...

Embodiment 3

[0148] The technical process and device structure adopted in this embodiment are as attached image 3 shown. This embodiment has many similarities with Embodiment 1, and only the differences from Embodiment 1 will be described below.

[0149] The original flue gas flow rate of this embodiment is 300×10 4 N m 3 / h, the temperature is 140 degrees Celsius, and the sulfur dioxide content is 8000mg / Nm 3 , there are 4 layers of spraying in the absorption tower, the flow velocity of the flue gas flowing through the absorption tower is 3.9m / s, the net flue gas temperature of the discharge system is about 49 degrees, SO 2 The content is 100mg / Nm 3 , equipped with 4 circulating pumps, the injection of oxidizing air adopts the pipe network method, there is no agitator in the slurry pool of the absorption tower, and a circulating pump is used to transport part of the slurry back to the absorption tower to prevent the solid ammonium sulfate in the slurry pool from settling.

[0150] T...

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Abstract

The invention relates to a process and a device for processing smoke containing sulfur dioxide and preparing solid ammonium sulfate. The original smoke is purified after sprayed, washed and demisted by ammonium sulfate slurry; the sulfur dioxide in the smoke reacts with injected ammonia water and oxidation air to generate ammonium sulfate and form crystals; and after the ammonium sulfate slurry carries out cooling crystallization, primary rotational flow, secondary rotational flow, dehydration and drying, the solid ammonium sulfate is obtained. The device comprises an absorbing tower, a circulating pump, a cooling crystallizer, a primary whirlcone, a secondary whirlcone and dehydrating and drying equipment. The invention integrally finishes the absorption and the oxidation of the sulfur dioxide and the crystallizing process of the ammonium sulfate in the absorbing tower, sorts the ammonium sulfate crystals with larger particles by the cooling crystallizer and the two stages of whirlcones and can obtain an ammonium sulfate solid with lower energy consumption.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a process and a device for purifying waste gas containing sulfur dioxide and preparing solid ammonium sulfate. Background technique [0002] Boilers in facilities such as thermal power generation, waste incineration, and petroleum refining will emit a large amount of flue gas containing sulfur dioxide, causing serious pollution to the atmospheric environment. In response to this problem, many processes have been developed to control sulfur dioxide pollution in exhaust gas, including the ammonia process using ammonia as an absorbent. [0003] Chinese patent CN1101720C discloses a device for removing sulfur dioxide from flue gas and producing ammonium sulfate. Using equipment including scrubbers and oxidation devices, the flue gas is scrubbed to obtain ammonium sulfate substantially free of impurities solution, suitable for the production of pure ammonium sulfate. ...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50C01C1/24
Inventor 张明吴树志李永旺崔一尘马志刚
Owner BEIJING BOOTES ELECTRIC POWER SCI & TECH
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