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Coke-oven gas waste heat high-low-temperature comprehensive recycling system and method

The technology of a recovery system and recovery method is applied in the field of high and low temperature comprehensive recovery system for waste heat of waste gas, which can solve the problems of affecting heat exchange efficiency, narrow recovery temperature range, and complex composition of waste gas, so as to improve the life of heat exchangers and reduce the cost of enterprises. The effect of running costs

Active Publication Date: 2017-06-13
HUATIAN ENG & TECH CORP MCC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problems faced by waste heat recovery of coke oven raw gas are as follows: first, the recovery temperature range is narrow, and waste heat above 500 °C is usually recovered; second, the composition of raw gas is complex, which is prone to coking and affects heat transfer efficiency

Method used

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  • Coke-oven gas waste heat high-low-temperature comprehensive recycling system and method

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Embodiment 1

[0034] Such as Figure 1-2 As shown, this embodiment provides a high-low temperature comprehensive recovery method for waste heat of raw coal gas. The system includes a high-temperature heat exchanger 1 , a medium-temperature spray cooler 2 , a low-temperature heat exchanger 3 and a low-temperature spray cooler 4 .

[0035] The high-temperature raw gas above 650°C coming out of the coking chamber enters the high-temperature heat exchanger 1 for heat exchange, and the temperature of the raw gas at the outlet of the high-temperature heat exchanger drops to about 470°C, recovering the first part of high-temperature waste heat. If the heat exchange medium is liquid, it adopts the form of downstream heat exchange. The heat exchange medium enters the heat exchanger from the inlet 1.1 of the working medium side of the high temperature heat exchanger 1, and leaves the heat exchanger from the outlet 1.2 of the working medium side; if the heat exchange medium adopts The gas medium adopt...

Embodiment 2

[0045] The difference between this embodiment and the above-mentioned embodiments is that the low-temperature heat exchanger and the high-temperature heat exchanger in this embodiment use the same working fluid. Therefore, in this embodiment, the two are connected in series. The heat exchanger is initially heated, and then enters the high-temperature heat exchanger to further improve the thermal quality of the heat exchange medium.

[0046] In the above embodiments, the intermediate temperature cooler adopts a rectangular box, and the box may not use a rectangular box, but a pipe with a circular cross section or other shapes.

[0047] In the above embodiment, the nozzle of the intermediate temperature cooler sprays ammonia water. It should be understood that the use of ammonia water here is a preferred embodiment mode, not the only one, and other cooling means in the field can also be used.

[0048] In the above embodiments, the nozzles in the cryocooler spray water mist. It s...

Embodiment 3

[0052] This embodiment provides a high and low temperature comprehensive recovery method for waste heat of raw gas comprehensively recovering waste heat of raw gas.

[0053] In order to achieve the above object, the high and low temperature comprehensive recovery method of waste gas waste heat of the present invention comprises the following steps:

[0054] S1 uses a high-temperature heat exchanger to exchange heat for raw gas, and controls the outlet gas temperature of the high-temperature heat exchanger to be 470±10°C;

[0055] S2 uses a medium-temperature cooler to cool down the raw gas, and controls the outlet gas temperature of the medium-temperature cooler to 260±10°C; the medium-temperature spray cooler is arranged horizontally, and multiple fan-shaped nozzles are arranged at the inlet section. According to the ratio of length and width of the cooler, 1-3 nozzles are distributed on the top and side of the cooler. The high-pressure circulating ammonia water is sprayed o...

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Abstract

The invention discloses a coke-oven gas waste heat high-low-temperature comprehensive recycling system and method, mainly aims at the problem of low recycled heat in existing coke-oven gas waste heat recycling and provides a coke-oven gas waste heat high-low-temperature comprehensive recycling system for comprehensively recycling coke-oven gas waste heat. The method includes: adopting a high-temperature heat exchanger to recycle waste heat, higher than 470+ / -10 DEG C, of coke-oven gas; cooling the coke-oven gas to 260+ / -10 DEG C to remove most organic matters; adopting a low-temperature heat exchanger to recycle waste heat resources, at 120+ / -10 DEG C-260+ / -10 DEG C, of the coke-oven gas; adopting a low-temperature cooler to cool the coke-oven gas to 80+ / -10 DEG C. By the method, coke-oven gas waste heat recycling temperature interval is expanded, and service life of equipment is prolonged.

Description

technical field [0001] The invention relates to a high and low temperature comprehensive recovery system and method for waste heat of raw coal gas. Background technique [0002] With the continuous promotion of energy conservation and emission reduction policies in the international community, the production pressure of high-energy-consuming enterprises is increasing. How to reduce energy consumption of enterprises has become an important issue faced by many high-energy-consuming enterprises. Coking is an important part of the iron and steel industry, and it is also a part of high energy consumption. The outlet temperature of coke oven raw gas is 650-750°C, and its heat loss accounts for about 33% of the energy consumption of coke ovens. However, this part of heat energy has not been effectively recovered. [0003] Due to the complex composition of raw coal gas, especially the components that are easy to coke such as tar, it is difficult to recover the remaining heat. When t...

Claims

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Application Information

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IPC IPC(8): F28C1/00F28F25/06F28D7/00F28D7/06
CPCF28C1/00F28D7/00F28D7/06F28F25/06
Inventor 余波王浩杨春根赵贤林
Owner HUATIAN ENG & TECH CORP MCC
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