Coking residual ammonia water distilling process
A coking residual ammonia water and process technology, applied in the direction of distillation and separation, inorganic chemistry, ammonia compounds, etc., can solve the problems of large amount of waste water, high comprehensive energy consumption, low concentration of finished ammonia water, etc., to reduce distillation temperature, reduce energy consumption, Avoid the effect of low concentration of finished ammonia water
Inactive Publication Date: 2017-01-18
山东焦化技术咨询服务有限公司
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Problems solved by technology
The traditional residual ammonia distillation process is generally atmospheric distillation, the distillation temperature is 105°C, and heating with steam or gas is required. Generally, 96,000 kcal of heat is consumed per distillation of 1 ton of residual ammonia, which is equivalent to 13.7 kg of standard coal, and the overall energy consumption is relatively high.
The ammonia gas at the top of the tower also needs a large amount of cooling water for condensation cooling, resulting in a large amount of waste water
However, the existing vacuum distillation process has the problem of low ammonia concentration in the finished product
Method used
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Embodiment Construction
[0020] will refer to figure 1 To describe the ultra-low energy distillation process of coking residual ammonia water.
[0021] First, use the waste heat in the raw coal gas to heat the remaining ammonia water and ammonia distilled waste water.
[0022] Such as figure 1 As shown, the raw gas at about 80°C enters from the raw gas inlet 15 of the waste heat recovery device 10 and is discharged from the waste gas outlet 16 at the lower section of the waste heat recovery device 10 . Coking residual ammonia water and ammonia distilled waste water enter the lower half and upper half of the upper section of the raw gas waste heat recovery and utilization device 10 through the residual ammonia water inlet 11 and the ammonia distilled wastewater inlet 12 respectively.
[0023] During the process of the raw gas flowing from the raw gas inlet 15 of the raw gas waste heat recovery utilization device 10 to the raw gas outlet 16, the remaining ammonia water and ammonia distillation waste w...
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The invention provides a coking residual ammonia water distilling process. The coking residual ammonia water distilling process comprises the following steps: heating residual ammonia water and steaming waste ammonia water by utilizing afterheat in recycled crude gas; enabling the heated residual ammonia water to enter a negative pressure distillation device, and distilling to obtain ammonia gas and water vapor; condensing the ammonia gas and the water vapor by using a condensing cooler; enabling the condensed ammonia water to enter an ammonia diluting water tank; reflowing a part of the ammonia water in the ammonia diluting water tank into the negative pressure distillation device, and enabling the rest ammonia water to enter a vacuum system, wherein the vacuum system generates negative pressure by an injection-absorption combined process so as to meet needs of the distilling process. The coking residual ammonia water distilling process provided by the invention is based on reduced pressure distillation, and the distillation temperature is reduced, so that the afterheat of the crude gas can be used as a heat source, without additionally supplementing heat needed by distillation.
Description
technical field [0001] The invention relates to the field of energy saving and emission reduction. Specifically, the invention provides an ultra-low energy consumption distillation process technology for excess ammonia water that can be widely used in the coking industry. Background technique [0002] The coking coal enters the coke oven to generate coke and raw gas. The moisture content in the coking coal is about 10%, and combined water is produced during the high-temperature dry distillation process. The total moisture of 12% of the coking coal consumption is converted into residual ammonia water. The total ammonia content in the remaining ammonia water is about 5000mg / L, and there is a small amount of H 2 S, HCN, etc., the ammonia and H in the remaining ammonia must be distilled 2 S, HCN, etc. are separated, and the separated wastewater can be treated in the biochemical sewage treatment process to achieve standard discharge. The traditional residual ammonia distillatio...
Claims
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IPC IPC(8): B01D3/00C02F1/16C01C1/02C02F101/16
CPCB01D3/00C01C1/022C02F1/048C02F1/16C02F2101/16C02F2301/063Y02P20/129Y02P70/10
Inventor王清涛王贺红甄玉科李存涛顾德华王方张顺贤陈国祥
Owner山东焦化技术咨询服务有限公司