Structural principle

The fully welded plate type air (gas) preheater is a new and efficient important device for recovering waste heat (waste heat). It is used in hydrogen production conversion furnaces, cracking furnaces, heating furnaces, steelmaking furnaces in the steel industry, waste gas catalytic incinerators, hot blast stoves, and other working conditions that generate high-temperature flue gas. It can exchange heat with the cold air (gas) used for combustion. It has been widely used in industries such as refining, chemical, steel, power, cement, and light industry.

The fully welded plate preheater uses stainless steel corrugated heat transfer plates instead of traditional round or heat pipe heat transfer elements. Smoke and air (coal gas) are heat exchanged through plates, completely isolating cold and hot fluids. Due to the constantly changing cross-sectional shape of the heat transfer plates along the flow direction of the medium, the disturbance of the fluid is greatly enhanced, thereby increasing the heat transfer performance of the fluid. Because the surface of the board is smooth, it has a smaller thermal resistance to dirt.

characteristic

The fully welded plate type air (gas) preheater is currently one of the more advanced high-efficiency and energy-saving products, with advantages such as high heat transfer efficiency, pressure reduction, compact structure, corrosion resistance, long service life, low dust accumulation and easy cleaning. It avoids the failure caused by traditional heat pipe heat exchangers due to high temperature tube bursting, low temperature corrosion, dust accumulation and blockage, and avoids the disadvantages of large heat pipe structure, short service life, and difficult cleaning. Compared with traditional tubular and rotary preheaters, it overcomes common problems such as ash accumulation, coking, and air leakage, and is increasingly widely used in the petrochemical, power, and steel industries.

scope of application

In the high-temperature metallurgical industry, the exhaust gas emitted from blast furnaces is used to heat the air required for combustion

Garbage incinerator, using high-temperature flue gas after incineration to heat the air required for combustion

Heating furnaces in the refining industry utilize the air required for combustion of high-temperature flue gas emissions

Hydrogen production conversion furnace device, recovering fuel tail gas, heating and burning combustion air to assist combustion

Integrated air preheater/economizer equipment used in boilers/furnaces

The non-ferrous metal industry uses high-temperature flue gas from industrial furnaces to heat the air required for combustion

The calcium carbide industry uses high-temperature flue gas from industrial furnaces to heat the air required for combustion

The glass industry uses high-temperature flue gas from industrial furnaces to heat the air required for combustion

The cement industry uses high-temperature flue gas from industrial furnaces to heat the air required for combustion

Technical Parameter

◆Large scale, modular, and modular

The large fully welded plate type air (gas) preheater adopts modular design and modular manufacturing, which is easy to transport, assemble on site, and can replace modules separately. It can also provide flexible expansion to meet future expansion needs.

According to the characteristics of the fluid, cross flow, counter flow, and mixed arrangements of cross flow and counter flow can be achieved, as well as single process and multi process combination arrangements, which can solve the heat transfer and resistance reduction problems between most processes.

By selecting different materials based on the waste heat temperature, a multi-stage combination of high-temperature preheating and low-temperature preheating can be achieved, solving the difficulties of high-temperature heat recovery and low-temperature dew point corrosion problems.

◆Optimization design of large and unequal channels

Based on the temperature and volume changes before and after heating of air (gas) and cooling of flue gas, the fully welded plate type air (gas) adopts a cross flow and counter flow plate design with unequal channels. According to the characteristic of easy ash accumulation and blockage of flue gas, the spacing between flue gas side channels is ≥ 16mm. By optimizing the spacing between plate bundles, the gas flow channel can be made smooth, ensuring excellent fluid dynamics performance - high heat transfer efficiency and low pressure drop.

Jiangnan Cooling Plant provides cooling equipment for a steel plant in Shandong province3200Fully welded plate flue gas for cubic meter blast furnace renovation-Gas and air dual preheating heat exchanger products, in2017The product was installed on site in the year and after several months of operation, it fully achieved the expected effect of the project renovation. The technical parameters of the operation meet the design and usage requirements, greatly improving the production efficiency of the steel company and effectively achieving the customer's goal of energy conservation and consumption reduction. It has been highly praised by the customer!(The following is the on-site installation diagram)

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