A regenerative waste heat recovery equipment based on automatic control and its recovery method

Abstract

The invention relates to an automatic control based heat storage type waste heat recovery device and method. The automatic control based heat storage type waste heat recovery device and method can achieve automatic control; the device can also serve as an intelligent recovery process module for industrial furnace smoke waste heat; the device and the method are mainly used for recovering industrial furnace smoke waste heat. The modular design is suitable for access combination under any field conditions; quick stop valves can be quickly and simply operated and changed. The device comprise a body and a two-port three-way valve; the body and the two-port three-way are available in terms of modular design, manufacturing, inspection, acceptance, transportation, installation, maintenance and modular replacement under same model and specification.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery equipment, in particular to a regenerative waste heat recovery equipment and processing method based on automatic control, which is suitable for recovery of waste heat from industrial furnace flue gas, especially suitable for recovery of waste heat from regenerative high-temperature flue gas The field of industrial furnace flue gas waste heat recovery that is intelligently and automatically controlled in the process can also be used as an intelligent recovery equipment for industrial furnace flue gas waste heat. Background technique [0002] In the field of flue gas waste heat recovery, it has been developed from ND steel to ceramic tubes to resist dew point corrosion. The most effective, economical and reasonable method for flue gas waste heat recovery is process utilization. After process utilization, the waste heat recovery of low-temperature flue gas should be very important. Be ca...

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Problems solved by technology

[0002] In the field of flue gas waste heat recovery, it has been developed from ND steel to ceramic tubes to resist dew point corrosion. The most effective, economical and reasonable method for flue gas waste heat recovery is process utilization. After process utilization, the waste heat recovery of low-temperature flue gas should be very important. Be cautious, because acid gas will be produced during the combustion process, and dew point corrosion will occur if the waste heat recovery is excessive. Dew point corrosion is electrochemical corrosion, and the corrosion speed is fast. If the consequences are serious, the equipment can be invalidated within a week for carbon steel, and for stainless steel 40 If the fuel contains sulfur, it will increase the dew point temperature of the flue gas. Since the heat exchange area of ​​the existing flue gas waste heat recovery device is fixed, the production load design of the device will increase. There is 30% operating flexibility, and the temperature change within the elastic range should be the sum of the flue gas dew point temperature and the temperature change within the operating elastic range, but the actual situation is that some users only pursue energy-saving effects and blindly increase the heat exchange area. The purpose of waste heat recovery is achieved, but the device loses its operational flexibility, which brings hidden dangers to the production safety of the device, and also brings hidden dangers to the large-scale benefit and safety of the device

The structure of partition heat exchange includes plate type, cast plate type (cast plate type can be divided into cast iron and cast steel), heat pipe type, phase change boiler, etc. At present, ceramic composite tubes have been developed, which adds to the partition wall heat transfer. Thermal resistance value, in order to achieve the same effect, it is necessary to increase the investment, which reduces the economic rationality. Metal waste heat recovery equipment has a congenital dew point corrosion bottleneck; regenerative waste heat recovery is a newly developed form of flue gas waste heat recovery, such as the name It is a regenerative transcritical flue gas waste heat recovery device with the patent number CN200910028334.9. The waste heat of transcritical flue gas is discharged below the dew point of the flue gas. It is difficult to determine the discharge position below the dew point of the flue gas. The protection below the dew point It is also necessary to increase investment to reduce economic rationality, especially to bring psychological shadow of dew point corrosion to users, and there is a hidden danger of operational psychological safety; for example, the patent number is CN201120245296 and the Chinese patent named a regenerative waste heat recovery system, The reciprocating switching of the two sets of waste heat recovery devices will cause instantaneous connection problems, resulting in potential safety hazards of collusion; and the Chinese patent with the patent number CN201210449433.6 and the name of a regenerative waste heat recovery combined equipment and its temperature control method, then The control of flue gas temperature not reaching the dew point is achieved through the method of parallel connection of multiple groups and the removal of parallel groups, which requires that the number of groups to be designed is sufficient at the beginning of the design, otherwise, it is difficult to achieve the purpose of lowering the temperature control, and this method has not been realized Automatic control, subsequent adjustments mean potential safety hazards, and such multiple connections are not economical

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