Synthetic ammonia device ammonia hydroxide concentrating method
A technology for synthesizing ammonia and ammonia water, which is applied in the direction of ammonia preparation/separation, etc., which can solve the problems of increasing enterprise costs and achieve the effect of improving economic benefits
Active Publication Date: 2015-05-06
SICHUAN MEIFENG CHEM IND
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Problems solved by technology
Because the concentration of ammonia water is too low, customers do not need low-concentration ammonia water, and they need to spend money to hire someone to take away the low-concentration ammonia water, which increases the cost of the enterprise
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[0019] Such as figure 1 Shown, a kind of synthetic ammonia plant ammonia water concentration method comprises the following steps,
[0020] 1) Send the 8% ammonia water produced by the membrane recovery ammonia washing tower 1 to the atmospheric pressure ammonia washing tower 2, and its flow rate is about 1.6T / h. After washing the ammonia-containing gas in the atmospheric pressure ammonia washing tower 2, the concentration increases ;
[0021] 2) Send the ammonia water in the atmospheric pressure ammonia washing tower 2 in step 1) to the low pressure ammonia washing tower 3 to wash the high-concentration ammonia-containing medium, so that the concentration increases to 18%;
[0022] 3) Mix the ammonia water in the middle and low pressure ammonia washing tower 3 in step 1 and the remaining 1.4t / h ammonia water in the membrane recovery ammonia washing tower 1, and then send it to the ammonia water storage tank 4 with a concentration of about 15%.
[0023] In the above steps 2)...
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The invention discloses a synthetic ammonia device ammonia hydroxide concentrating method which comprises the following steps: 1) conveying a part of the ammonia hydroxide which is generated by a membrane recovery ammonia washing device and has a concentration of 7-9% to a normal-pressure ammonia washing device at a flow of 1.6 T / h, and washing in the normal-pressure ammonia washing device to increase the concentration; 2) conveying the ammonia hydroxide in the normal-pressure ammonia washing device in the step 1) to a low-pressure ammonia washing device and washing the high-concentration ammonia-containing medium to increase the concentration to 17-18%; and 3) mixing the ammonia hydroxide of the low-pressure ammonia washing device in the step 2) with the residual 1.4 t / h ammonia hydroxide of the membrane recovery ammonia washing device and sending the mixture to an ammonia hydroxide storage tank, wherein the concentration of the mixture is 14-15%. According to the synthetic ammonia device ammonia hydroxide concentrating method provided by the invention, the desalted water dosage of the normal-pressure ammonia washing device and the low-pressure ammonia washing device can be decreased. Through step-by-step concentration, the concentration of the ammonia hydroxide can be up to 15% so as to achieve the concentration required by the customers, increase the enterprise income and improve the economic benefit.
Description
technical field [0001] The invention relates to ammonia water treatment technology in an ammonia synthesis system, in particular to a method for concentrating ammonia water in an ammonia synthesis device. technical background [0002] At present, in the treatment of ammonia water in the ammonia synthesis system, three sets of ammonia washing equipment are used: membrane recovery ammonia washing tower, atmospheric pressure ammonia washing tower and low pressure ammonia washing tower. The ammonia water produced is directly put into the ammonia water storage tank. Ammonia scrubbers and low-pressure ammonia scrubbers consume a large amount of desalted water. Because the concentration of ammonia water is too low, customers do not need low-concentration ammonia water, and they need to pay someone to take away the low-concentration ammonia water, which increases the cost of the enterprise. Contents of the invention [0003] The purpose of the present invention is to solve the a...
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IPC IPC(8): C01C1/02
Inventor 蒋先贵陈正乾张永斌云华姚林朱兴红
Owner SICHUAN MEIFENG CHEM IND