Tubeless heat exchanger and waste heat recovery system

Abstract

The invention discloses a tubeless heat exchanger and a waste heat recovery system. The tubeless heat exchanger is connected by at least one particle curtain heat exchange unit, and the particle curtain heat exchange unit has a gas channel in the shape of a horizontal straight tube. The gas passage is provided with a particle inlet and a particle outlet, and the particles are used as heat exchange medium to form a particle curtain from the particle inlet to the particle outlet, and the particles are inert solid particles. The waste heat recovery system includes a tubeless heat exchanger that feeds flue gas, which is called a flue gas tubeless heat exchanger, and a tubeless heat exchanger that feeds air is called an air tubeless heat exchanger. The conveying device is connected with the flue gas tubeless heat exchanger, the air tubeless heat exchanger and the particle conveying device through a particle pipeline. The tubeless heat exchanger and waste heat recovery system of the present invention have high heat exchange efficiency, low equipment consumables, low operation and maintenance costs, good sealing performance, and low energy consumption, and are suitable for various industries with high exhaust temperature and waste heat utilization value equipment and reactors.

Description

technical field [0001] The invention mainly relates to the technical field of high-efficiency heat exchange and waste heat recovery and utilization, and is especially suitable for various industrial equipment and reactors with high exhaust gas temperature and waste heat utilization value, including industrial boilers, power station boilers, various furnaces, and smelting furnaces. , Sintering furnace, heating furnace and waste incineration device, etc. technical background [0002] my country has an astonishing number of various industrial boilers, power plant boilers, metallurgical furnaces and various heating furnaces. The primary energy consumed by these boilers and furnaces accounts for more than two-thirds of my country's fossil fuels. Due to the design defects of these boilers and kilns and the characteristics of the fuel used during operation, operating conditions and equipment defects (such as heat transfer efficiency decline), the exhaust temperature of most boilers...

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Problems solved by technology

Due to the limitations of the structure of the air preheater and the heat transfer mechanism, these traditional tube shell and regenerative tubeless heat exchangers have always had the following problems and have not been resolved for a long time: (1) The heat transfer efficiency is not high, no The metal or glass consumption of the tube heat exchanger is huge, the equipment is heavy, and the manufacturing, operation and maintenance costs are high; (2) The air leakage is large (8% to 30%), which increases the power consumption of the blower by more than 15 to 30%. And it seriously affects the operation output of the unit; (3) It is very easy to cause dust, blockage and low-temperature corrosion of the heated area, which greatly increases the ventilation resistance (up to 2500Pa), thereby greatly increasing the power consumption of the fan and the operation and maintenance cost of the equipment; (4) It is difficult Further increase the temperature of the preheated air (mostly around 400°C), so it is difficult to meet the high temperature requirements of stable and efficient combustion of various low-quality solid fuels and flameless combustion of low-quality gases and liquid fuels; (5) When boilers or kilns exist When design and equipment defects, fuel quality and working conditions change, the preheater of the existing structure has no real-time adjustment means, etc.

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