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Production process and crystallization device for large-particle ammonium sulfate

A technology of production process and crystallization device, which is applied in the field of production process and crystallization device of large-grained ammonium sulfate by pickling method, can solve the problems of uneven particle size of ammonium sulfate product, easy loss of mixing equipment, high energy consumption, etc., and achieve intensified production capacity and operational stability, optimized internal circulation channel, and high internal circulation rate

Active Publication Date: 2009-09-16
天津天达联合工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pickling process technology is currently all imported, and the investment is large, and the crystallizer adopts a large-flow mother liquor circulation, which has problems such as high energy consumption, uneven particle size of ammonium sulfate products, and easy loss of mixing equipment.

Method used

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  • Production process and crystallization device for large-particle ammonium sulfate
  • Production process and crystallization device for large-particle ammonium sulfate
  • Production process and crystallization device for large-particle ammonium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The 30% unsaturated ammonium sulfate mother liquor from the pickling tower is sent to the ammonium sulfate crystallizer, where continuous evaporation, concentration and crystallization are carried out, and the evaporation temperature is 40°C. Under the vacuum condition at the top of the crystallizer, 30% of the evaporated water vapor is mixed with the medium-pressure steam by the vacuum jet pump 1, and then pumped to the mother liquor heater to heat the circulating ammonium sulfate mother liquor. The amount of circulating mother liquor entering the external circulation channel is 10 times the feed amount of the raw material inlet of the crystallizer. Through the circulation and concentration of the mother liquor, the ammonium sulfate crystal particles grow continuously, and high-quality ammonium sulfate products with a diameter of 500-2000 μm and a cylindrical shape are obtained. The grown ammonium sulfate crystals are deposited at the bottom of the crystallizer, and ar...

Embodiment 2

[0048] The 50% unsaturated ammonium sulfate mother liquor from the pickling tower is sent to the ammonium sulfate crystallizer, where evaporation, concentration and crystallization are carried out, and the evaporation temperature is 70°C. Under the vacuum condition at the top of the crystallizer, 70% of the evaporated water vapor is mixed with the medium-pressure steam by the vacuum jet pump 1, and then pumped to the mother liquor heater to heat the circulating ammonium sulfate mother liquor. The amount of circulating mother liquor entering the external circulation channel is 40 times the feed amount of the raw material inlet of the crystallizer. Through the circulation and concentration of the mother liquor, the ammonium sulfate crystal particles grow continuously to obtain cylindrical high-quality ammonium sulfate products. The grown ammonium sulfate crystals are deposited at the bottom of the crystallizer, and are pumped to the ammonium sulfate drying and packaging unit wit...

Embodiment 3

[0050] The 43% unsaturated ammonium sulfate mother liquor from the pickling tower is sent to the ammonium sulfate crystallizer, where evaporation, concentration and crystallization are carried out, and the evaporation temperature is 55°C. Under the vacuum condition at the top of the crystallizer, 55% of the evaporated water vapor is mixed with the medium-pressure steam by the vacuum jet pump 1, and then pumped to the mother liquor heater to heat the circulating ammonium sulfate mother liquor. The amount of circulating mother liquor entering the external circulation channel is 25 times the feed amount of the raw material inlet of the crystallizer. Through the circulation and concentration of the mother liquor, the ammonium sulfate crystal particles grow continuously, and high-quality ammonium sulfate products with a diameter of 500-2000 μm and a cylindrical shape are obtained. The grown ammonium sulfate crystals are deposited at the bottom of the crystallizer, and are pumped to...

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Abstract

The invention relates to a production process and a crystallization device for large-particle ammonium sulfate. 30-50 percent unsaturated ammonium sulfate solution from an acid-cleaning unit enters a crystallizer and then is evaporated in vacuum at an operation temperature of between 40 and 70 DEG C so as to evaporate moisture and obtain ammonium sulfate crystals; during crystallization, ammonium sulfate mother solution is subjected to heat exchange in an outer circulation channel, and excessive fine crystals are eliminated; and the circulating mother solution entering the outer circulation channel is heated by use of part of low-pressure steam from the crystallizer, so that energy consumption is reduced by 20 to 40 percent. The crystallization device adopts an optimized flow-guiding crystallizer (DTB), and a blender perpendicularly stretches into a flow-guiding cylinder from the bottom of the crystallizer. Because the production process effectively controls the supersaturation degree of the ammonium sulfate mother solution inside the crystallizer, large-particle ammonium sulfate crystals can be obtained, and the quality of ammonium sulfate is improved. The crystallizer is not easy to form crystal scabs inside, has reasonable structure and high production capability, can ensure the production of the crystal products with narrow particle-size range, and can meet the requirements of users on different particle size of the crystal products.

Description

technical field [0001] The invention relates to a method for continuously producing clean and large-grain ammonium sulfate with a DTB crystallizer, in particular to a production process and a crystallization device for producing large-grain ammonium sulfate by pickling in a coke oven gas purification project. technical background [0002] Coke oven gas contains 8-16g / m 3 Ammonia, also contains small amounts of HCN. Controlling the emission of ammonia in gas is of great significance to reducing environmental pollution and protecting ecological balance. Ammonium sulfate, also known as ammonium sulfate, fertilizer field powder, it can be used as base fertilizer, topdressing fertilizer, seed fertilizer, and can also be used to produce compound fertilizer. It is an important agricultural fertilizer. Therefore, the use of ammonia in coke oven gas to produce ammonium sulfate realizes the comprehensive utilization of ammonia and has good economic benefits. It is an important resea...

Claims

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Application Information

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IPC IPC(8): C01C1/24
CPCC01C1/248
Inventor 卫宏远
Owner 天津天达联合工程技术有限公司
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