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Multipurpose use technology reducing evaporation steam consumption

An evaporation steam and process technology, applied in the direction of multi-effect evaporation, etc., can solve the problems of clean energy loss, non-conforming to circular economy, etc., and achieve the effects of reducing evaporation steam consumption, improving energy utilization rate, and saving energy

Inactive Publication Date: 2008-06-25
祁颖
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a pity that such a large amount of clean energy is lost in vain
However, the society needs 45℃~90℃ hot water and produces it by itself, which does not meet the requirements of circular economy.

Method used

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  • Multipurpose use technology reducing evaporation steam consumption

Examples

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Comparison scheme
Effect test

example 1

[0009] Example one uses 3.4 tons of steam to produce 1 ton of 31 alkali downstream (without increasing capacity) and continuously produces 1.9 tons, two, two steams (output increases or decreases as required). 31 alkali is sent countercurrently to produce 1 ton of 42 alkali in one effect, and consumes 1.1 tons of steam at the same time. (High-temperature energy-enhancing alkali) Countercurrent continuous production of 23.5 alkali 0.36 tons, sending downstream 0.82 tons of secondary steam to produce 42 alkali (or sending downstream three-effect distribution) and the remaining 1.08 tons of output evaporation system can be effectively used, thereby saving energy. At the same time, the yield of reverse-effect 42 base is 3 times that of single production. Evaporation steam consumption 2.51 tons [(3.4+1.1-1.08) / 1.36] saving rate is 24.87% (3.4-2.51) / 3.4×95%

example 2

[0010] Example 2 Countercurrent production alone produces 1 ton of 42 alkali by steaming 23.5 alkali in one effect, and 0.26 tons of salt in the reverse one effect. The life of the first effect heater (nickel) is only 5 years due to severe abrasion, which needs to be solved urgently.

[0011] Forward-reversing process When steaming 31% alkali in reverse one effect to produce 1 ton of 42% alkali, 0.02 tons of salt will be produced in one effect, which is about 13 times lower. For example, one effect steaming 32-36 alkali to produce 1 ton of 42 alkali is produced in one effect, and the salt is not lost in one effect, which greatly reduces equipment abrasion and prolongs the service life. Concentrated effect, no salt precipitation, no salt production, no tank washing or less washing, and a thorough simplification of the process is an unprecedented major innovation, and it is one of the biggest advantages of the forward and reverse process.

[0012] Downstream three-effect product...

example 3

[0014] Example 3 Regarding the use of the second-effect secondary steam [about 3.4 tons of steam to produce 1 ton of 30 alkali (steam rating 2.65) continuous production of secondary steam about 1.98 tons]

[0015] 1. Evaporation for personal use

[0016] Using forward and reverse technology (using stainless steel equipment to open four effects) to produce 0.47 tons of 30 alkali with 1.98 tons of secondary steam, the steam consumption will be reduced by 12%.

[0017] 2. Second and second steam output

[0018] The second-effect secondary steam is a clean energy, which is used for indirect heating to produce hot water below 90°C. (1) Hot water enters houses, baths, and hotels. (2) Indirect or direct use for heating. (3) Preheat the brine. If 1.98 tons of secondary steam can be fully utilized, the reduction rate of steam consumption of 1.42 tons (3.40-1.98) is 44% (2.65-1.42) / 2.65×95%.

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Abstract

The invention relates to a comprehensive utilization technique for reducing evaporating steam consumption, in which the original concurrent technique is changed into a countercurrent technique. Steam electrolyte is added at a first effect, the steam flows through the first effect, the second effect and the third effect and reaches a condensator, but a part of the secondary steam at the second effect is output, and the electrolyte is evaporated by the first effect, the second effect and the third effect and thus the finish product is obtained. The original concurrent technique is turned into the countercurrent technique as follows; the first effect is added with steam, and the steam passes through the first effect, the second effect and the third effect and reaches the condensator; the electrolyte is added at the third effect, passes through the second effect and is conveyed to the third effect, and then countercurrent is evaporated to the semi-product alkali of the concurrent effect, and finally evaporated into the finish product. The invention adopts novel technique and utilizes the concurrent second effect and third effect hybrid technique to produce alkali with a certain concentration and continuously produces the secondary steam at the third effect steam, which creates new conditions, widens the energy application scope, and brings about necessary and sufficient conditions for the rational matching, comprehensive utilization of the evaporated materials in the evaporation system, and taking respective advantages and saving energy, thus creating an original advanced countercurrent technique, greatly decreasing the evaporation steam consumption, and solving the problems existing in the present production.

Description

technical field [0001] The invention relates to a comprehensive utilization process for reducing evaporation steam consumption in the evaporation process of producing alkali, sugar, salt and the like. Background technique [0002] my country currently produces about 3 million tons of caustic soda and about 12 million tons of soda ash. Sugar, salt and other products all have evaporation processes, which can be called large energy consumers. Although three-effect evaporation is adopted, the evaporation loss rate per ton of caustic soda is still about 65%. The final secondary steam is condensed by water to produce 45°C water for air cooling. It is a pity that such a large amount of clean energy is lost in vain. However, the society needs hot water at 45°C to 90°C and produces it by itself, which does not meet the requirements of circular economy. Contents of the invention [0003] The purpose of the present invention is to provide a comprehensive utilization process for r...

Claims

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Application Information

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IPC IPC(8): B01D1/26
Inventor 祁颖
Owner 祁颖
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