Steel rolling heating furnace waste heat steam recycling system and recycling method

Abstract

The invention discloses a steel rolling heating furnace waste heat steam recycling system and recycling method, and relates to the field of continuous steel rolling heating furnace evaporative cooling steam waste heat recovery. The steel rolling heating furnace waste heat steam recycling system comprises a steam input pipeline, screw expanders, loading equipment and an electromotor. The steam input pipeline is led out from an evaporative cooling system of a steel rolling heating furnace. A steam inlet of each screw expander communicates with the steam input pipeline, and the output ends of the screw expanders can be connected with the loading equipment. The output end of the electromotor can be connected with the loading equipment. The steel rolling heating furnace waste heat steam recycling system and recycling method aim to overcome the defect that when low-pressure saturated steam is utilized for driving the screw expanders and then directly driving loads, the real-time adjustment requirement of the loading work condition is hard to effectively meet; and the real-time use requirement of the loading equipment can be met.

Description

technical field [0001] The invention relates to the field of waste heat recovery of vaporized cooling steam of a continuous steel rolling heating furnace, and more specifically relates to a recovery and utilization system and a recovery method of waste heat steam of a steel rolling heating furnace. Background technique [0002] At present, the cooling of heating furnace components mainly includes water cooling and vaporization cooling. Water cooling uses the temperature rise of water to absorb heat. Evaporative cooling mainly uses the latent heat when water turns into steam, absorbs a large amount of heat, and cools the cooling components; research shows that under the condition of absorbing the same heat, the water supply of the evaporative cooling system is only 1 / 60 of that of the water cooling system It has a significant water-saving effect. At the same time, because the vaporization cooling system of the heating furnace has the advantages of energy saving, reducing the...

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Problems solved by technology

[0003] Due to the adoption of the vaporization cooling method, the steel rolling heating furnace will generate a large amount of low-pressure saturated steam during the production process; however, since the pressure of these low-pressure saturated steam is mostly below 0.7Mpa, it cannot be incorporated into the main steam network for effective use, and a large amount of steam can only be released in vain With the development of technology, ORC organic Rankine cycle power generation technology has been developed to utilize low-grade waste heat resources; such as patent publication number: CN 202001071U, publication date: October 2011 On May 5, the application disclosed an organic Rankine cycle waste heat power generation system for low-grade flue gas from the heating furnace in the steel rolling workshop. waste heat recovery

However, the disadvantages of this application are: the use of ORC technology requires high equipment requirements, large investment, and the risk of organic working medium leakage; at the same time, if the ORC power generation technology is used in the field of low-pressure saturated steam waste heat utilization, it needs to be replaced. The heater converts the steam energy into the internal energy of the organic working fluid, and then uses the organic working fluid to drive the generating set to generate electricity. The number of energy conversions is large, which reduces the heat utilization rate of the low-pressure saturated steam and is not practical enough.

But the shortcomings of this application are: (1) the power system disclosed in this application is only suitable for the utilization of high temperature and high pressure or medium temperature and medium pressure steam waste heat, and is not suitable for the field of low pressure saturated steam waste heat recovery and utilization; (2) due to In actual production, the load often needs to be adjusted in real time according to the specific use requirements. When the amount of steam entering the screw expander and the steam quality fluctuate greatly, it is difficult to adjust the load in real time through the workmanship of the screw expander.

[0005] To sum up, in the prior art, although there are related technical proposals for using high-temperature and high-pressure steam or medium-temperature and medium-pressure steam to drive the screw expander to directly drive the load, how to overcome the problem of using low-pressure saturated steam to drive the screw expander and then directly drive the load? When the load is on, it is difficult to effectively meet the real-time adjustment requirements of the load condition, which is a technical problem that needs to be solved urgently in the prior art

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