Technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies

Abstract

The invention relates to a technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies, the main procedures comprise desalting sea water, air-blowing bromine, removing impurities for clarification, heating solar pond and storing halogen, evaporating for concentration, compressing and crystallizing for salt making, brine chemical engineering, etc. the invention desalts sea water, makes salt and comprehensively uses by-products thereof by utilizing wind energy, solar energy and heat pump technologies, organically combines sea water desalting, salt making and comprehensive use of dregs and waste liquor, takes wind energy, solar energy and other renewable energy resources as main energy sources, changes sea salt production from drying on beach in the open air manually to mechanized and automated operation, puts an end to the backward state of sea salt enterprises, can save energy consumption and reduce pollution, can save investment by about 50% and occupied area by 95%, not only lowers production cost, but also recovers 35m<2> of fresh water by producing one ton of salt, thus protecting fresh water resource.

Description

technical field [0001] The invention relates to a technology for seawater desalination, salt production and comprehensive utilization of by-products by using wind energy, solar energy and heat pump technology. Background technique [0002] my country has a long coastline and is a big producer of sea salt, but the production technology is backward and cannot realize the modern production of factory buildings, which is not in line with the development of modern science and technology: (1) The annual production of one ton of sea salt takes up 250m of coastal land 2 , according to the national annual output of 30 million tons, occupying 7.5 million hectares of beach land, occupying a large amount of precious land resources; (2) open-air operations, low technical content, heavy labor load, high production costs, and poor enterprise benefits; (3) sea salt crystallization The process is open-air beach drying, which is restricted by natural conditions and cannot achieve stable and h...

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Problems solved by technology

[0002] my country has a long coastline and is a big producer of sea salt, but the production technology is backward and cannot realize the modern production of factory buildings, which is not in line with the development of modern science and technology: (1) The annual production of one ton of sea salt takes up 250m of coastal land 2 , according to the national annual output of 30 million tons, occupying 7.5 million hectares of beach land, occupying a large amount of precious land resources; (2) open-air operations, low technical content, heavy labor load, high production costs, and poor enterprise benefits; (3) sea salt crystallization The process is open-air beach drying, which is restricted by natural conditions and cannot achieve stable and high yields, and the product quality does not meet food hygiene and safety; (4) It is difficult to collect old brine when drying sea salt on the beach, and it is discharged arbitrarily, which seriously affects the ecological environment along the coast; (5) A large amount of fresh water is evaporated during the production of sea salt, and about 35 tons of salt are evaporated for each ton of salt produced. There is no recycling, resulting in a great waste of resources; (6) The current vacuum salt production consumes 280 kilograms of coal for each ton of salt produced. Annual production of 30 million tons of salt consumes 8.4 million tons of coal, wastes resources, pollutes the atmosphere, and runs counter to the energy conservation and emission reduction advocated by the state

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