Preparation technology and equipment for sulfuric acid for coking industry

Abstract

The invention relates to a preparation technology and equipment for sulfuric acid for the coking industry. The preparation equipment comprises an acid preparation tower, a circulating pump, a circulating cooler, a demister, a dilute acid nozzle, a flow record adjusting instrument, a flow record proportion adjusting instrument, a liquid level record adjusting instrument and a temperature monitoringinstrument. The preparation technology and equipment have the beneficial effects that the problem of the key of a preparation process for sulfuric acid, namely, corrosion and heat release of equipment can be solved, the continuous and automatic operation of acid preparation can be realized, the emission of acid mist is reduced, the personal safety hazards are eliminated, the environment is protected, the heat exchange speed is high, the storage tank space is saved, the cost is low, the maintenance is convenient, and the like.

Description

technical field [0001] The invention relates to the technical field of metallurgical coking, in particular to a sulfuric acid preparation process and equipment for the coking industry. Background technique [0002] The concentration of dilute sulfuric acid used in the metallurgical coking industry is basically 50-75%, and most of it is used in the phenoxide decomposition unit of the tar distillation unit. At present, dilute sulfuric acid is generally obtained by diluting concentrated sulfuric acid (93-98%) with water. The existing preparation process and equipment are very simple. A horizontal storage tank is used as an acid distribution tank with a serpentine pipe at the bottom. The top of the heat exchanger is equipped with a concentrated sulfuric acid inlet and an industrial water inlet. Before preparation, the water required for acid preparation is generally added according to calculations, and then concentrated sulfuric acid (93-98%) is slowly added. Since the process ...

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Problems solved by technology

[0004] 1) The sulfuric acid preparation process is characterized by corrosion and heat release. During the dilution process of concentrated sulfuric acid, a large amount of heat will be released, which requires a very large heat exchanger. If the heat cannot be discharged in time, the temperature of dilute sulfuric acid will rise beyond the design temperature , the corrosiveness of sulfuric acid increases sharply, then the consequences are unimaginable;

[0005] 2) Due to the acid distribution tank of this process, the serpentine tube heat exchanger is located inside the equipment, the heat exchange area is limited, and the heat basically cannot be discharged in time. In order to reduce the operating temperature, the injection speed of concentrated sulfuric acid is extremely slow. It usually takes a day or two for a tank of dilute acid, and the efficiency is very low. Sometimes it is difficult to control the amount of acid added, and the operating temperature is overheated, so the corrosion of the storage tank is accelerated, and it will be corroded in a short time;

[0006] 3) Since the heat exchanger is installed inside the equipment, the equipment is not easy to be lined and maintenance is inconvenient;

[0007] 4) The injection method of concentrated sulfuric acid has no special treatment, it is easy to generate acid mist, and it will flow out from the release port, causing harm, endangering personal safety and polluting the environment

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