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High-temperature liquid slag waste heat recovery system

A waste heat recovery system and liquid slag technology, applied in the direction of recycling technology, etc., can solve the problems of no waste heat recovery, large cooling water consumption, high pressure steam polluting the surrounding environment, etc., and achieve the effect of reducing the consumption and improving the utilization rate of waste heat.

Active Publication Date: 2020-07-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems that the existing high-temperature liquid slag and high-quality energy recovery equipment consume a large amount of cooling water, the high-pressure steam pollutes the surrounding environment, and the waste heat is basically not recovered. It provides a waste heat recovery system for high-temperature liquid slag. A small amount of cooling water can fully exchange heat in the high-temperature liquid slag inside the slag quick-cooling high-pressure tank, and generate a large amount of steam that can be recycled, which improves the utilization rate of waste heat resources, and the structure of the whole device is relatively simple, which greatly reduces the manufacturing cost. cost

Method used

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  • High-temperature liquid slag waste heat recovery system
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  • High-temperature liquid slag waste heat recovery system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0059] A waste heat recovery system for high-temperature liquid slag in this embodiment includes three parts: a slag receiving unit 100, a molten slag quick cooling unit 200, and a recovery unit 300, wherein the slag receiving unit 100 is used to receive high-temperature liquid slag, while the slag receiving unit 100 also transports the high-temperature liquid slag to the slag rapid cooling unit 200 under a certain pressure; It refers to giving the high-temperature liquid slag an instantaneous impact force, causing it to disperse into small liquid droplets, fall into the cooling water 241 and solidify into an amorphous glass phase to be discharged. pressure; at the same time, the recovery unit 300 exchanges heat with soft water for the mixed steam in the slag quick cooling unit 200, and the clean steam formed by the heat exchange is recycled, that is, heat energy is converted into electric energy.

[0060] Concrete combination figure 1 Specifically, the slag receiving unit 10...

Embodiment 2

[0067] This embodiment is basically the same as Embodiment 1, except that the deflector 220 forms an included angle of 80° with the inner wall of the molten slag quick-cooling high-pressure tank 210, and the swirl nozzle 140 beats the high-temperature liquid slag at a pressure of 500Kpa. On the deflector 220; at the same time, the slag rapid cooling unit 200 also includes a pressure gauge 231 and a pressure relief valve 232, that is, a pressure gauge 231 and a pressure relief valve 232 are installed above the slag rapid cooling high-pressure tank 210, and the slag rapid cooling The pressure in the high pressure tank 210 should be kept within a stable range of 480kPa. During normal operation of the system, if the pressure in the tank is higher than the value range, it will be monitored by the pressure gauge 231, and the pressure reducing valve 232 should be adjusted accordingly to reach the normal range, such as figure 2 Shown; Correspondingly, the pressure of high pressure wat...

Embodiment 3

[0069]The inventor tried to change the angle of the deflector 220 and the output pressure of the high-temperature pump 120 to study the particle size of the solidified amorphous glass phase in the slag quick-cooling high-pressure tank 210, and wanted to obtain as much solid slag as possible, so as to make full use of the high-temperature liquid slag energy, reduce the post-treatment process of solid slag, and make it easy to recycle to the cement plant for use. It is found that the high-temperature liquid slag reaches the position of the deflector 220 (the angle between the deflector 220 and the vertical direction is between 20-80°C), when the pressure of the high-temperature pump 120 is too high, the angle between the deflector 220 and the vertical direction If the included angle is too small, high-temperature slag will splash on the side wall of the slag quick-cooling high-pressure tank 210. After a long time, too much liquid slag will accumulate on the side wall, wear the sl...

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Abstract

The invention discloses a high-temperature liquid slag waste heat recovery system, and relates to high-temperature liquid slag and high-quality energy recovery equipment in the metallurgical industry.The high-temperature liquid slag waste heat recovery system comprises a slag receiving unit, a molten slag quick cooling unit and a recovery unit. The slag receiving unit is used for receiving high-temperature liquid slag and sprays the high-temperature liquid slag into the molten slag quick cooling unit through a high-temperature pump under the condition of a certain pressure. The molten slag quick cooling unit pelletizes the high-temperature liquid slag to form liquid droplets under the strong cold condition and the high pressure condition, and the liquid droplets fall into cooling water inthe molten slag quick cooling unit, are converted into granular amorphous glass phases and are discharged. The recovery unit enables the mixed steam in the molten slag quick cooling unit to be subjected to heat exchange with soft water, and the heat is used for waste heat power generation or used in the industry. The pressure of the high-temperature liquid slag conveying operation of the slag receiving unit is larger than that of the interior of molten slag quick cooling unit. By the adoption of the high-temperature liquid slag waste heat recovery system, the waste heat utilization rate of the high-temperature liquid slag treatment can be substantially improved, the consumption of the cooling water is reduced, and energy conservation and emission reduction of iron and steel enterprises are facilitated.

Description

technical field [0001] The invention belongs to the field of high-temperature liquid slag and high-quality energy recovery equipment in the metallurgical industry, and more specifically relates to a waste heat recovery system for high-temperature liquid slag. Background technique [0002] In iron and steel production, high-quality steam mainly uses water-quenched blast furnace slag process at home and abroad, which will form a large amount of low-quality warm water and saturated steam, but it is difficult to be recycled, and about 15% of the slag washing water will evaporate and absorb heat Turning into water vapor and releasing it not only causes a waste of energy and water resources, but also contains a large amount of harmful substances (hydrogen sulfide, sulfur dioxide) in the water vapor, which seriously pollutes the environment. [0003] For a long time, many researchers have studied this problem, and designed blast furnace slag such as wind quenching method, double co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08
CPCC21B3/06C21B3/08C21B2400/024C21B2400/034C21B2400/062C21B2400/066C21B2400/08Y02W30/50
Inventor 陈光包向军葛庆世徐超成张璐
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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