System for generating hot water by recovering low-temperature waste heat in process of making acid by using smoke
A technology of flue gas acid production and waste heat recovery system, which is applied in the directions of climate sustainability, sustainable manufacturing/processing, inorganic chemistry, etc., to achieve the effects of long equipment service life, simple system structure and high degree of control
Inactive Publication Date: 2015-04-22
CHINA NERIN ENG
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Problems solved by technology
[0004] The present invention aims to solve the technical problems existing in the prior art, and proposes a system for recovering low-temperature waste heat from the flue gas acid production process, and recovers the low-temperature waste heat in the flue gas acid production process to generate high-temperature hot water
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Embodiment 1
[0016] A system that recovers low-temperature waste heat to produce hot water in the process of making acid from flue gas is used to recover hot water from low-temperature waste heat in a 100,000-ton / year copper smelting flue gas acid-making plant:
[0017] First, about 60-80 ℃ low-temperature hot water from the thermal heat exchange station enters the hot water buffer tank, and the liquid level of the hot water buffer tank is controlled by a liquid level gauge.
[0018] Then, the 60-80°C low-temperature hot water is sent to the first-suction plate heat exchanger through the hot water pump to recover the waste heat. The temperature of the recovered hot water is controlled at 95-100°C and sent to the thermal heat exchange station.
[0019] Among them, the thermal heat transfer station changes with different seasons. In winter, the waste heat in the acid at the outlet of the first suction tower can be completely recovered to generate hot water for reuse to the thermal heat excha...
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The invention discloses a system for generating hot water by recovering low-temperature waste heat in the process of making an acid by using smoke. The system comprises an absorption tower plate-type heat exchanger, an absorption tower anodic protection acid cooler, a hot water buffering tank and a hot water pump. The absorption tower plate-type heat exchanger is arranged in front of the absorption tower anodic protection acid cooler, so that the temperature of the acid entering the anodic protection acid cooler is lower than 100 DEG C, and the service life of equipment can be prolonged. The absorption tower plate-type heat exchanger and the absorption tower anodic protection acid cooler are connected in series to be used, the hot water pump is connected with the hot water buffering tank and the absorption tower plate-type heat exchanger, and a waste heat recovery system is controlled by DCS, so that material and heat balance in the waste heat recovery system is ensured. The system disclosed by the invention can be used for generating hot water by effectively recovering low-temperature waste heat in the process of making the acid by using smoke, can be applied to the recovery of low-temperature waste heat in the process of making the acid by using smoke in the industries such as non-ferrous metals, steel and chemical industry, and is simple in structure, convenient to operate, low in operation cost, economic, environment-friendly and capable of effectively promoting the development of circular economy of an enterprise.
Description
technical field [0001] The invention relates to the field of flue gas acid production in nonferrous metals, iron and steel, chemical industry and other industries. It recycles and utilizes the low-temperature residual heat generated in the absorption process of flue gas acid production, and specifically relates to absorbing SO from a suction tower in a flue gas acid production device. 3 The low-temperature residual heat of concentrated sulfuric acid is utilized, which belongs to the technical field of comprehensive utilization of residual heat. Background technique [0002] In nonferrous metals, iron and steel, chemical and other smelting factories, the basic process of flue gas acid production includes SO 2 Flue gas purification, SO 2 Flue gas conversion, SO 2 Flue gas drying and SO 3 process of absorption. Accompanied by the conversion, drying and absorption process, a large amount of heat of reaction and dilution heat will be generated, of which about 6% of the heat e...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C01B17/74
CPCC01B17/74Y02P20/10Y02P20/129
Inventor 曹霞黄卫华熊小鹏周清涂瑞谈河君
Owner CHINA NERIN ENG