Method and equipment for transporting dilute nitric acid in procedure of producing nitric acid through dual compression method
A technology of double pressurization and dilute nitric acid, applied in the directions of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of increased chances of mechanical seal damage of dilute acid pumps, surge of nitrogen oxide compressors, and low utilization rate of equipment. , to achieve the effect of reducing interlocking parking accidents, reasonable configuration, and saving equipment investment
Active Publication Date: 2007-11-21
TIANJI COAL CHEM IND GROUP
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Problems solved by technology
However, in actual production, due to failure of the dilute acid pump, backflow due to failure of the outlet check valve, gas in the liquid, etc., the liquid level of the nitrogen oxide separator may be out of control and cause panting of the nitrogen oxide compressor. Vibration and liquid accidents, ranging from interlock parking, to severe accidents
[0006] 2. In the production of nitric acid, the ceramic ring filler in the oxidation furnace will continuously produce some fragments, which may enter the dilute acid pump with the dilute nitric acid, which increases the chance of damage to the mechanical seal of the dilute acid pump.
The start-up acid tank and start-up acid pump are only used when the system is started up, and they are idle when the system is in normal production, and the utilization rate of the equipment is very low
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[0027] As shown in Figure 1, the acid-gas mixture enters the nitrogen oxide separator 1 and is separated by the nitrogen oxide separator 1. After the gas is mixed with the air from the bleaching tower, it enters the nitrogen oxide compressor, and the resulting dilute The nitric acid flows from the bottom of the separator through the pipeline 2 into the start-up acid tank 4. An automatic liquid level regulating valve 3 is installed on the pipeline 2 to realize the liquid level control in the nitrogen oxide separator, and the dilute nitric acid produced will be timely Drain to start-up acid tank for storage.
[0028] Three dilute acid pumps 5 are arranged at the back of the start-up acid tank 4. After the dilute nitric acid stored in the start-up acid tank 4 is boosted by any one of the dilute acid pumps 5, the five, six, seven or eight tray layers are opened. The cut-off valve 11 of any one layer controls the flow rate with the flow regulating valve 6, and dilute nitric acid is...
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This invention relates to a method for producing nitric acid. The method comprises: (1) controlling the liquid level in the nitric oxide separator by an automatic adjusting valve; (2) transporting 34% diluted nitric acid from the nitric oxide separator to an acid tank; (3) transporting the nitric acid with an acid valve to an absorption column. The method has such advantages as high safety, reasonable equipment arrangement, and optimized process.
Description
technical field [0001] The invention relates to a production method of nitric acid, especially a method for transporting 34% dilute nitric acid separated by a nitrogen oxide separator to an absorption tower in a double-pressurized nitric acid production method, and a device for transporting dilute nitric acid. Background technique [0002] Since the industrial production of nitric acid was realized more than 100 years ago, due to the limitation of conditions in various historical development periods, many nitric acid production methods have been born. In terms of pressure, they can be divided into normal pressure method, full medium pressure method, comprehensive method, and full high pressure method. and double pressurization method, etc. These nitric acid production methods all belong to the principle of ammonia contact oxidation to prepare nitric acid, including the production of NO by ammonia oxide, the reaction and absorption of nitrogen oxides with water to form acid, ...
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IPC IPC(8): C01B21/40
Inventor 王全文
Owner TIANJI COAL CHEM IND GROUP