CN201209909Y - Acid and alkali neutralization type heating device utilizing low temperature exhaust heat of sulfuric acid production - Google Patents

Abstract

The utility relates to technology field of waste heat utilization, more concretely a heating device utilizing low temperature residual heat from acid-base neutralization type vitriol production. The device comprises an acid cooling device, user pipe network. The acid cooling device is divided into tube pass and shell pass. The tube pass communicates with user pipe network through pipeline to form a circulated pipeline. The device is characterized in that a base liquor tank communicates with circulated pipeline by pipeline, a base liquor pump is disposed at pipeline between circulated pipeline and base liquor tank. The heating device of the utility is safe and long-life.

Description

An acid-base neutralization device that uses sulfuric acid to produce low-temperature waste heat for heating

technical field

The utility model belongs to the technical field of waste heat utilization, in particular to an acid-base neutralization device which utilizes sulfuric acid to produce low-temperature waste heat for heating.

Background technique

In China, sulfuric acid production includes sulfuric acid production, pyrite acid production, and smelting flue gas production of acid. Most of the above-mentioned acid production methods adopt relatively advanced two-turn and two-absorption acid production processes. During the acid production process, chemical reactions The heat generated is considerable, and fully recovering and utilizing this heat is an important task in the sulfuric acid manufacturing industry. In the two-rotation and two-suction acid production process, the waste heat at 800-1000°C during the roasting process is usually called high-temperature waste heat, about Accounting for 60% of the total waste heat, waste heat around 500°C in the conversion process is called medium-temperature waste heat, accounting for about 15% of the total waste heat, and waste heat around 100°C in the dry absorption process is called low-temperature waste heat, accounting for about 10% 25%, high-temperature waste heat and medium-temperature waste heat are relatively easy to recycle because of their high temperature, low-temperature waste heat has a low temperature, and the acid temperature is related to the concentration of acid, such as in pyrite acid production, the concentration of primary acid and secondary acid is 98%, the acid temperature is about 100°C, the concentration of dry acid is 93%, and the acid temperature is about 70°C; The temperature is about 100°C. Due to the difficulty of recovery, most sulfuric acid manufacturers do not recover low-temperature waste heat. Generally, the generated acid with low-temperature waste heat flows through the acid cooler to exchange heat with circulating cold water to cool down. This will not only prevent low-temperature waste heat from being obtained Utilize, and in order to reduce the temperature of acid, also need to use a large amount of cold water, both wasted energy, wasted water source again. For this reason, the applicant declared a patent application number of 200710014486.4 on May 30, 2007, which is a patent application technology for a method and device for heating by using sulfuric acid to produce low-temperature waste heat. Good economic benefits have been achieved.

Contents of the invention

The purpose of the utility model is to provide a safe and long service life acid-base neutralization device which uses sulfuric acid to produce low-temperature waste heat for heating.

The utility model is achieved through the following technical solutions:

That is, an acid-base neutralization device that uses sulfuric acid to produce low-temperature waste heat for heating, including an acid cooler and a user pipe network. The acid cooler is divided into a tube side and a shell side. The tube side is connected to the user pipe network through pipelines to form a cycle The pipeline is characterized in that a lye tank is connected to the circulation pipeline through the pipeline, and an lye pump is arranged on the pipeline between the circulation pipeline and the lye tank.

The utility model has the advantages of safety and long service life. Once the acid cooler leaks acid, through isolation, after the leaking acid cooler is shut down and repaired, the remaining trace of acidic environment can be recovered from the lye by the lye pump after the acid cooler is resumed and connected to the circulation pipeline. Take a certain amount of 30% NaOH lye from the tank and inject it into the acid cooler after acid leakage treatment in the circulation pipeline or other relevant parts in the user pipe network in time to restore the PH value of the heating circulation water to the normal application range Within, to prevent corrosion of pipelines and equipment, prolong service life.

Description of drawings

Fig. 1 is the schematic diagram of the utility model embodiment 1;

Fig. 2 is a schematic diagram of Embodiment 2 of the present utility model.

As shown in the figure: 1 acid cooler, 2 lye pump, 3 lye tank, 4 user pipe network, 5 hot water tank, 6 warm water tank. The arrows in the figure indicate the flow direction of the liquid in the pipeline.

Detailed ways

Example 1

As shown in Figure 1, the acid cooler 1 is divided into a tube side and a shell side. The tube side is connected to the user pipe network 4 through a pipeline to form a circulation pipeline. The lye tank 3 is connected to the circulation pipeline through a pipeline, and the lye tank A lye pump 2 is arranged on the pipeline between 3 and the circulation pipeline.

During normal heating, when the acid cooler leaks acid, and after the acid cooler is isolated, shut down for maintenance and put into operation, a certain amount of 30 is injected into the relevant parts of the circulation pipeline through the lye pump 2 and the lye tank 3 % concentration of NaOH lye can restore the PH value of the heating circulating water to the normal application range, which can effectively prevent acid leakage from corroding pipelines and equipment and prolong the service life.

Example 2

As shown in Figure 2, the acid cooler 1 is divided into a tube side and a shell side. The tube side is connected to the user pipe network 4, hot water tank 5, and warm water tank 6 through pipelines to form a circulation pipeline. The lye tank 3 passes through the pipeline It is connected with the circulation pipeline, and the pipeline between the lye tank 3 and the circulation pipeline is provided with an lye pump 2 .

During normal heating, when the acid cooler leaks acid, and after the acid cooler is isolated, shut down for maintenance and put into operation, a certain amount of 30 is injected into the relevant parts of the circulation pipeline through the lye pump 2 and the lye tank 3 % concentration of NaOH lye can restore the PH value of the heating circulating water to the normal application range, which can effectively prevent acid leakage from corroding pipelines and equipment and prolong the service life.

The utility model is not limited to the above embodiments, and heat exchangers, filters, water replenishment tanks and other devices can also be added on the circulation pipeline, and the concentration of the NaOH lye in the embodiments of the utility model can also be changed.

Claims (2)

1, a kind of acid-base neutralization formula device of utilizing residual heat of sulfuric acid production to heat, comprise acid cooler, user's pipe network, acid cooler is divided into tube side and shell side, and tube side is connected to form circulation line by pipeline and user's pipe network, it is characterized in that also being provided with alkali liquid tank and is connected with circulation line by pipeline.

2, a kind of acid-base neutralization formula according to claim 1 device of utilizing residual heat of sulfuric acid production to heat is characterized in that the pipeline between circulation line and the alkali liquid tank is provided with lye pump.

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