Wet ammonia desulfurization concentration process of cold and hot state discharge

A kind of ammonia desulfurization and process technology, which is applied in the field of wet ammonia desulfurization concentration process, can solve the problems of increasing energy consumption, ammonia escape, increasing the load in the tower, etc., and achieves the reduction of ammonia escape rate, high desulfurization efficiency, and high desulfurization rate Effect

Inactive Publication Date: 2011-10-05
SHANGHAI UNIV
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Problems solved by technology

[0005] There are many problems in this process in practical engineering application: (1) Absorption, oxidation and concentration are all carried out in the tower, it is difficult to control the oxidation rate, absorption effect, pH value and crystal formation at the same time; (2) The temperature of the raw flue gas is generally As high as above 120°C, the direct absorption effect is very poor, because the decomposition temperature of the main product ammonium sulfite after absorption is roughly 50°C-60°C, and ammonium sulfite will decompose again, which will affect the desulfurization effect; (3) Excessive flue gas High absorbent ammonia water will also be decomposed by heat, resulting in ammonia escape and damage to the demister; (4) Since the desulfurization process is affected by many factors, such as boiler load, coal quality and absorbent pH v

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  • Wet ammonia desulfurization concentration process of cold and hot state discharge
  • Wet ammonia desulfurization concentration process of cold and hot state discharge

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[0026] It can be seen from the previous process and control and the definition of the hot and cold state that the pH value, density and solid content of the concentrated liquid need to be controlled, but it is impossible to add ammonia to the concentrated liquid to adjust the pH value. Therefore, the present invention The pH value of the concentrated solution is indirectly controlled by adding liquid ammonia to the oxidation tank to adjust the pH value of the oxidizing solution. The density adjustment is mainly performed by the coordinated control of the concentrated solution circulation pump, the concentrated solution discharge pump and the oxidizing solution discharge pump. The control of solid content is controlled by the selection of the discharging method.

[0027] (1) Control of pH value of concentrate

[0028] The main components of the concentrated solution are ammonium sulfate, part of ammonium bisulfate and a small amount of ammonia. Because the original flue gas of the c...

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Abstract

The invention relates to a wet ammonia desulfurization concentration process of cold and hot discharge. A desulfurization tower is partitioned into a concentration section and an absorption section through a gas-liquid separation partition plate; oxidized saturated ammonium sulfate solution is concentrated, and original flue gas is washed, wetted and cooled at the concentration section; the saturated ammonium sulfate solution is continuously concentrated, and partial crystal is generated; the slurry of the concentration section is controlled in certain pH value and density range; when the solid content is high, cold state discharge is adopted; when the solid content is low, hot state discharge is adopted; and when the solid content is in a proper range, the slurry is discharged out of thedesulfurization tower in two discharge modes of cold and hot states and enters subsequent devices for processing, and high-quality ammonium sulfate byproducts are produced. By the process, synchronous implementation of crystallization in the tower and crystallization out of the tower can be realized, the recovery rate of ammonia is maximized and the purposes of achieving high desulfurization efficiency, saving energy, reducing consumption and producing the high-quality ammonium sulfate byproducts are fulfilled.

Description

technical field [0001] The invention relates to the technical field of resources and environment, and specifically relates to a wet ammonia desulfurization and concentration process for discharging materials in cold and hot states. Background technique [0002] At present, the limestone-gypsum method is basically the main desulfurization device in my country. Firstly, because the desulfurization agent limestone is abundant and cheap, and the limestone-gypsum method technology is quite mature and open in foreign countries, and it is easy to obtain. However, the equipment of this technology is easy to foul and block, the system is complex, the investment is large, the area is large, the secondary pollution is generated, and the operating costs are high. The wet ammonia desulfurization technology does not produce carbon dioxide when removing sulfur dioxide in the flue gas (calcium method produces 0.7 tons of carbon dioxide when removing 1 ton of sulfur dioxide), and does not pr...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C01C1/24
CPCY02P20/50
Inventor 何仁初万皓袁义顾晓婧范向东
Owner SHANGHAI UNIV
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