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Sodium salt containing fume purification solution treatment process

A technology of flue gas purification and solution treatment, which is applied in the field of flue gas purification, can solve problems such as no solutions have been proposed, and achieve the effects of reducing energy consumption, reducing production energy consumption, and improving economic benefits

Active Publication Date: 2016-10-26
CHENGDU HUAXITANG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of different ion balances in the sodium salt alkali-making process, in order to obtain high-quality ammonium sulfate and improve economic benefits, part of the residual liquid containing ammonium sulfate and sodium sulfate will be produced during the crystallization and separation process. However, for this part of the residual liquid Liquid treatment, no corresponding solution has been proposed in the existing public literature

Method used

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  • Sodium salt containing fume purification solution treatment process
  • Sodium salt containing fume purification solution treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example proposes a treatment process for flue gas purification solution containing sodium salt. The treatment system is a treatment process for the residual liquid obtained from the crystallizer during the preparation of ammonium sulfate by-product during the preparation of sodium bicarbonate from flue gas purification waste liquid. We know that the process of preparing sodium bicarbonate from flue gas purification waste liquid is that in the wet process using sodium bicarbonate as the desulfurization and denitrification absorbent, the obtained waste liquid is added to ammonium bicarbonate or NH 3 , CO 2 The process in which sodium bicarbonate is produced by reaction is recycled as an absorbent; the preparation process of by-product ammonium sulfate is to add ammonium bicarbonate or NH 3 , CO 2 The process of preparing ammonium sulfate from the liquid obtained after separation, such as figure 1 shown. The above-mentioned remaining liquid is the feed liquid obtai...

Embodiment 2

[0028] The difference between this embodiment and embodiment 1 is as follows:

[0029] The dryer used in this example is a tower structure, and the atomizer installed on the top of the dryer is a centrifugal atomizer. The top of the dryer is also equipped with a hot air distributor connected to the hot air inlet pipe, which can distribute the hot air evenly. into the dryer. The remaining liquid obtained by the crystallization separator is pressurized and transported to the atomizer installed on the top of the dryer. Under the action of high-speed centrifugal force, the atomizer atomizes the feed liquid into fine mist groups, which greatly increases the surface area of ​​the feed liquid , and then in the case of sufficient exchange with hot air, the water evaporates rapidly and dries into small particles.

[0030] The dry gas used in this embodiment is air at normal temperature, and the dry gas is heated to 300° C. by an electric heater.

Embodiment 3

[0032] The difference between this embodiment and embodiment 1 is as follows:

[0033] The dryer used in this embodiment is a box-type dryer, and the atomizer on the top of the dryer is a pressure-type atomizer. into the dryer.

[0034] The dry gas used in this example is coke oven flue gas, which is heated to 250° C. by an electric heater.

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Abstract

The invention discloses a sodium salt containing fume purification solution treatment process, and aims to treat a residual liquid generated from crystal separation of a side product ammonium sulfate when sodium bicarbonate is prepared from a fume purification waste liquid. The sodium salt containing fume purification solution treatment process comprises the following steps: the residual liquid generated from crystal separation is fed into a dryer, and sprayed by an atomizer at the top of the dryer to be contacted hot air fed into the dryer, evaporation drying is implemented, and a product is fed into a dust collector, thereby obtaining a composite fertilizer. The sodium salt containing fume purification solution treatment process is a novel process for evaporating and drying the residual liquid to obtain a high nitrogenous composite fertilizer, wherein the residual liquid is generated when ammonium bicarbonate or NH3 and CO2 are added into a solution to react and prepare sodium salt sodium carbonate and ammonium sulfate, and the solution is obtained after fume is purified by using sodium salt as an absorbent; the blank of conventional residual liquid treatment in the process of ammonium sulfate preparation is made up; the residual liquid can be evaporated and dried by using the dryer; a side product, namely, the high nitrogenous composite fertilizer, can be generated while high-quality ammonium sulfate is generated after the solution is purified by using a fume wet method; the purposes of realizing zero emission of a waste liquid, turning waste into wealth and improving economic benefits can be achieved.

Description

technical field [0001] The invention relates to a treatment process for a sodium salt-containing flue gas purification solution, in particular to a treatment process for waste liquid obtained after flue gas purification by adopting a sodium method process, and belongs to the technical field of flue gas purification. Background technique [0002] In recent years, as air pollution has become more and more serious, people have put forward higher requirements for the treatment of flue gas, especially coal-fired flue gas; In accordance with the "Emission Standards for Substances" (GB13223-2011), new emission limits for soot, sulfur dioxide, and nitrogen oxides in flue gas have been put forward. [0003] At present, it is an effective method to use sodium-based absorbents to control flue gas pollutants, but this method will produce a certain concentration of waste liquid containing sulfate and nitrate. An effective treatment method is to add ammonium bicarbonate or NH 3 , CO 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/18B01D1/14B01D50/00C05F7/00
CPCB01D1/14B01D1/18C05F7/00B01D50/20Y02A40/20
Inventor 李东林汤茂辉黄炳光周礼
Owner CHENGDU HUAXITANG ENVIRONMENTAL PROTECTION TECH CO LTD