JPS61138517A - Recovery of heat from hot gas containing impurity - Google Patents

Abstract

PURPOSE:To recover heat from hot gas by spraying water to remove impurities contained in hot gas and proceeding heat transmission by condensing the thereby generated steam. CONSTITUTION:The hot gas G contg. impurities T such as tar generated in a coke oven, etc. in high concn. is cooled by the water W sprayed by a water spray device 2 through a high pressure water pump 3, and the impurities T is discharged from a water discharge port 4 together with the water W. Simultaneously, low temp. steam S generated by the water spray is sent to a heat exchanger 5, where the low temp. steam S is condensed and the heat is transmitted to water or a heat medium F such as freon, and clean vapor of the heat medium Fs is generated, which is fed to a machine 7 utilizing vapor, such as room heater or powder dryer, etc. from a vapor discharge port 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recovering heat from high-temperature gas containing high concentration of impurities generated from coke ovens and the like.

[Prior art]

Conventionally, high-temperature coke oven gas emitted from coke ovens, etc. contains a high concentration of impurities such as tar, and the heat in the high-temperature gas is recovered using a sensible heat recovery device as shown in Figure 2. When this happens, impurities T such as carbon and tar contained in the high-temperature gas G adhere to the heat exchanger 1, which is the heat recovery device, around the heat transfer tube, and when the temperature becomes low, the impurities T precipitate. This poses a difficult problem: it solidifies, causing the pipes and heat exchangers to lose their functionality, making continuous operation impossible.This is considered the most difficult type of heat recovery and has not yet been put into practical use.

Therefore, the high temperature coke oven gas generated from conventional coke ovens was sprayed with water for several minutes to remove the tar content, but now the coke oven gas is simply taken out as cooled fuel gas. , I can't find anything that performs heat recovery.

[Purpose of the invention]

Therefore, the present invention solves the conventional problems and effectively recovers heat by dispersing water spray to remove impurities in high-temperature gas and condensing the water vapor generated at that time to conduct heat transfer. It is intended to do.

[Structure of the invention]

The method of recovering heat from impurity-containing high-temperature gas according to the present invention involves spraying water spray into impurity-containing high-temperature gas to discharge the impurities together with water, and generating low-temperature steam while cooling the high-temperature gas. It is characterized by recovering heat by further condensing and heat-transferring the water vapor.

〔Example〕

An embodiment of the apparatus for recovering heat from impurity-containing high-temperature gas by the method of the present invention will be described below with reference to FIG. Water W pumped from a high-pressure water pump 3 is sprayed into the high-temperature gas G by a water spray device 2 to cool the high-temperature gas G, and the impurities T are discharged together with the water W from the drain port 4.

At the same time as above, by spraying water onto the high temperature gas G by the water spray device 2, low temperature steam S is generated while cooling the high temperature gas G.

This low-temperature steam S is sent to the heat exchanger 5 while containing some impurities and gas, where the low-temperature steam S is condensed and heat-transferred to generate clean heat medium steam Fs using a heat medium F such as water or Freon. The steam is supplied from a steam outlet 6 to a machine 7 that uses steam, such as a heater or a powder dryer.

That is, since the above-mentioned low-temperature steam S retains latent heat even though it is low temperature, it is possible to easily extract heat by condensing and transferring heat in the heat exchanger 5, for example, in a normal shell and tube type heat exchanger. It is possible to create clean heat medium vapor Fs at a lower temperature by using a container, and this can be used as a heat source for dryers for heating, powder drying, etc., and can also be used for drying coking coal in coke ovens. It can also be used for

In addition, in FIG. 1, 8 is a drain, and 9 is a waste gas outlet.

〔Effect of the invention〕

Therefore, by adopting the method of the present invention, it is possible to remove impurities from high-temperature gas containing impurities, and at the same time, effectively recover the heat without impairing the function of the heat exchanger due to impurities in the high-temperature gas. This is extremely effective in making effective use of heat.

In addition, if the present invention is applied to high-temperature coke oven gas generated from a coke oven and coking coal is dried using the recovered heat source, the quality of coke product can be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic layout diagram showing an embodiment of a device for recovering heat from high temperature gas containing impurities by the method of the present invention;
The figure is a schematic layout diagram of a conventional device for recovering sensible heat from high-temperature gas. 2... Water spray device, 4... Drain port, 5... Heat exchanger, 6... Steam outlet, S... Low temperature steam, G
...High temperature gas, T...Impurities, W...Water. Procedural amendment (formality) April 9, 1985

Claims (1)

[Claims] Water spray is sprayed into high-temperature gas containing impurities to discharge the impurities along with the water, and the high-temperature gas is cooled while generating low-temperature steam, and the low-temperature steam is further condensed and heat transferred to recover heat. Features: A method for recovering heat from high-temperature gas containing impurities.