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A falling film evaporation process and device for coking sewage desorption wastewater

A technology of coking sewage and falling film evaporation, applied in the direction of heating water/sewage treatment, etc., can solve the problems of low heat utilization rate, hindering popularization and application, complicated system operation, etc., and achieve high heat utilization rate, low input cost, and process Reasonably compact effect

Active Publication Date: 2017-01-11
DALIAN HAOTONG ENVIRONMENTAL PROTECTION ENGINEERING TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this system, the heat transfer of the absorption heat pump is realized through two heat exchanges (ammonia vapor-working fluid, working fluid-wastewater), which has the problems of complex system operation, high equipment investment, and low heat utilization rate.
These problems have greatly hindered the popularization and application of the system in the coking industry

Method used

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  • A falling film evaporation process and device for coking sewage desorption wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The coking sewage enters the raw sewage tank 5, and is pumped out by the raw sewage pump 8 to send the sewage / wastewater heat exchanger 3 to exchange heat with the high-temperature waste water and raise the temperature to 97°C, then send it to the upper part of the desorption tower 1, and contact with the rising steam in the tower countercurrently, Desorb the NH contained in it by heating and stripping 3 、H 2 S, HCN and other components.

[0036] The temperature of the high-temperature wastewater obtained after desorption is 105°C. Most of the high-temperature wastewater is sent to the biochemical process for further treatment through the wastewater / wastewater heat exchanger 3 through the wastewater / wastewater heat exchanger 3, and then sent to the biochemical process for further treatment. A small part of the high-temperature wastewater enters the separation chamber of the falling film evaporator 2. The circulating wastewater at the bottom of the falling film evaporator...

Embodiment 2

[0040] The coking sewage enters the raw sewage tank 5, and is pumped out by the raw sewage pump 8 to send the sewage / wastewater heat exchanger 3 to exchange heat with high-temperature waste water and raise the temperature to 98°C. Desorb the NH contained in it by heating and stripping 3 、H 2 S, HCN and other components.

[0041] The temperature of the high-temperature wastewater obtained after desorption is 106°C. Most of the waste water is sent to the biochemical process for further treatment after the waste water pump 6 passes through the sewage / waste water heat exchanger 3 to exchange heat with the coking sewage. A small part of the high-temperature wastewater enters the separation chamber of the falling film evaporator 2. The circulating wastewater at the bottom of the falling film evaporator 2 is sent to the liquid distribution device at the top of the evaporator 2 by the circulating wastewater pump 7 to form a uniform liquid film and enter the heating tube, and partiall...

Embodiment 3

[0045] The coking sewage enters the raw sewage tank 5, and is pumped out by the raw sewage pump 8 to send the sewage / wastewater heat exchanger 3 to exchange heat with the high-temperature waste water and raise the temperature to 106°C. Desorb the NH contained in it by heating and stripping 3 、H 2 S, HCN and other components.

[0046] The temperature of the high-temperature wastewater obtained after desorption is 114°C. Most of the waste water is sent to the biochemical process for further treatment after the waste water pump 6 passes through the sewage / waste water heat exchanger 3 to exchange heat with the coking sewage. A small part of the high-temperature wastewater enters the separation chamber of the falling film evaporator 2. The circulating wastewater at the bottom of the falling film evaporator 2 is sent to the liquid distribution device at the top of the evaporator 2 by the circulating wastewater pump 7 to form a uniform liquid film and enter the heating tube, and par...

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Abstract

The present invention relates to a coking sewage desorption processes, which comprises that 1) coking sewage enters the top portion of a desorption tower, is subjected to steam stripping desorption, and then is discharged from the top portion of the tower; 2) the desorption gas enters a falling film evaporator, and is subjected to heat exchange with high-temperature wastewater to form ammonia vapor with an ammonia concentration of 10-20% and a condensed liquid; 3) the circulating wastewater introduced into the falling film evaporator from the desorption tower is evaporated to produce secondary steam; and 4) the low-temperature secondary steam is compressed into high-temperature and high-pressure overheating steam with a pressure of 0.14-0.6 MPa (A) and a temperature of 110-220 DEG C through a compressor, and is conveyed into the desorption tower as the supplement steam for the heating steam. The apparatus for achieving the process comprises the desorption tower, the falling film evaporator and the compressor. Compared with the process and the apparatus in the prior art, the process and the apparatus of the present invention have the following beneficial effects that the waste heat of the desorption gas on the top portion of the desorption tower can be recovered and utilized, the low-temperature heat source is converted into the high-temperature heat source through the compressor so as to return to the desorption tower and be reused, the consumption of the new steam is reduced by more than or equal to 60-75%, and characteristics of reasonable and compact process, simple operation, less equipment configuration and low investment cost are provided.

Description

technical field [0001] The invention relates to the technical field of coking sewage treatment, in particular to a falling film evaporation process and device for coking sewage desorption wastewater. Background technique [0002] The coking sewage produced in the coking production process mainly includes coking coal surface water, coking combined water and production sewage. The coking sewage contains complex impurities, mainly containing H 2 S, NH 3 , HCN, phenols and polycyclic aromatic hydrocarbons and other components. The main processes of coking sewage treatment are: solvent removal of phenols, desorption removal of H 2 S, NH 3 , HCN, biodegradation method to reduce COD of effluent wastewater, and desorption method is one of the important processes of sewage treatment, and its heat energy consumption (steam consumption, gas consumption, etc.) is closely related to the cost of the whole process of coking sewage treatment. [0003] At present, the desorption process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/08
Inventor 吴大川
Owner DALIAN HAOTONG ENVIRONMENTAL PROTECTION ENGINEERING TECHNOLOGY CO LTD
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