Ammonia-spillage amount control method in ammonia-process desulfurization

Abstract

The invention relates to an ammonia escaping amount controlling method that is used in ammonia desulphurization, belongs to the technical field of chemical engineering and environmental protection, and comprises following steps: a high-efficiency flue gas desulfurizing defogger (2) is arranged at the upper part of a washing and absorbing tower, sulphureous flue gas passes through an absorbing section and is chemically absorbed by an absorbing liquor then forms fog drops that contain ammonia salt and free ammonia, the fog drops rise into the region of the defogger (2) along with the flue gas, and the defogger (2) catches the ammoniac fog drops; the upper and lower ends of the defogger (2) that is arranged at the upper part of the washing and absorbing tower are assorted with technical watery regions for program controlling washing devices (1) and (3) sequentially, and the ammonia fog caught by the defogger (2) is washed and recycled; and the water supplement of a desulfurizing system is supplemented by technical washing water (4), thus satisfying water balance problem of the system. The method can lead the ammonia escaping amount in ammonia desulphurization to be much lower than GB14555-93 discharge limit value, solve the ammonia escaping amount control problem in ammonia desulphurization, lead the ammonia escaping amount to reach standards, improve the utilization rate of ammonia, and simultaneously avoid the corrosion of surrounding devices that is caused by wet ammoniac flue gas drops in the desulphurization, and is favorable for environmental protection.

Description

Technical field: [0001] The invention relates to a method for controlling the amount of ammonia escape in ammonia desulfurization, which belongs to the technical field of chemical engineering and environmental protection. Background technique: [0002] Ammonia absorption of SO 2 It is based on the classic chemical principle. The industrial application of desulfurization is to use the purchased liquid ammonia or ammonium carbonate as the source of ammonia. The liquid ammonia is gasified and dissolved in water to form ammonia water as the initial absorbent and added to the absorption mother liquor or the gaseous ammonia is directly added to the absorption mother liquor to recover the smoke. Low concentration of SO in the air 2 , so that the flue gas is discharged up to the standard, and obtained after absorption and neutralization (NH 4 ) 2 SO 4 The solution was evaporated, crystallized and dried to obtain the product. Small ammonia consumption, stable absorption. [000...

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Problems solved by technology

[0003] However, in the project, the process control is not good, part of the ammonia is discharged with the tail gas after desulfurization, and the ammonia escape exceeds the standard, which increases the ammonia consumption and the ammonia utilization rate is low. Sub-environmental pollution

[0004] Through document retrieval, do not see the public report identical with the present invention

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