Coke oven ascending pipe waste-heat utilization equipment

Abstract

The invention discloses coke oven ascending pipe waste-heat utilization equipment. The coke oven ascending pipe waste-heat utilization equipment comprises an ascending pipe heat exchange device and a steam-water separator. The ascending pipe heat exchange device comprises an outer shell, a heat insulation layer, a flame retardant coating and a heat exchange channel which are sequentially arranged from outside to inside. The heat exchange channel comprises heat exchange pipes which are spirally arranged, and every two circles of adjacent heat exchange pipes are tightly attached to each other. The outer wall of the side, facing the circle center of the heat exchange channel, of each heat exchange pipe is provided with a nano non-stick coating. The outer shell is connected with a carbonization chamber and a bridge duct in a sealing mode. The upper ends of the heat exchange pipes are provided with steam-water mixture outlets, and the steam-water mixture outlets stretch out of the outer shell and are connected with the outer shell in a sealing mode. The lower ends of the heat exchange pipes are provided with water inlets, and the water inlets stretch out of the outer shell and are connected with the outer shell in a sealing mode. The steam-water mixture outlets of the heat exchange pipes communicate with the upper portion of the steam-water separator, and the water inlets communicate with the lower portion of the steam-water separator. The lower portion of the steam-water separator is further provided with a water replenishing opening, and the water replenishing opening communicates with an industrial water pipeline. The coke oven ascending pipe waste-heat utilization equipment is high in heat exchange efficiency and capable of preventing coking.

Description

technical field [0001] The invention relates to waste heat utilization equipment of coke oven ascending pipe. Background technique [0002] The coke oven is an efficient energy conversion device that converts coal into coke, coke oven gas, coal tar, crude benzene and other products through high-temperature dry distillation. But at the same time, the coke oven process is also a process that consumes a lot of energy, accounting for 70-80% of the total energy consumption of coking. Therefore, reducing the energy consumption of coke ovens and recovering waste heat is an important direction for energy saving and emission reduction in the coking industry. [0003] In the heat balance of the coke oven, 650°C-750°C raw coke oven gas takes up about 36% of the heat, which has a very high recycling value. However, due to the complexity of raw gas composition, the waste heat recovery process is relatively the most difficult to realize. The traditional process uses circulating ammonia...

AI Technical Summary

Problems solved by technology

However, the main problems are: unreasonable structural design of the heat transfer process, insufficient circulation, channel blockage due to tar adhesion on the side wall of raw gas, coking of the heat transfer oil side, blockage of the heat transfer oil channel, etc.

But the main problem is: the impurities in the raw gas are easy to coke at the root of the water jacket in the alternating cold and hot environment, which affects the normal operation of the heat exchanger; the water jacket is affected by factors such as thermal stress and solder joints, and the service time is long Leakage will occur, causing safety accidents; under special circumstances, when the water is stopped and then water is sent, the inner cylinder is prone to deformation due to stress

The main problem is that the increased flow guide fins on the outer wall of the inner sleeve will increase the flow resistance and affect the flow performance of the working medium. At the same time, it is more likely to cause fouling at the connection, which affects the heat transfer effect and reduces the heat transfer efficiency.

[0007] To sum up, the traditional riser heat exchanger structure has a lot of coking and water leakage problems, which make the system unable to run safely and for a long time, while the new spiral coil structure is too complicated, and it cannot avoid the use of inner cylinder and The heat exchange form of the jacket, so a new riser waste heat recovery equipment must be actively developed to properly solve the above problems

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