Coke oven ascension pipe raw gas evaporative cooling device and preparation method thereof

Abstract

The invention discloses a coke oven ascension pipe raw gas evaporative cooling device and a preparation method thereof. The device comprises a cooling pipe, a raw gas inlet flange and a raw gas outlet flange, wherein the raw gas inlet flange and the raw gas outlet flange are connected with the two ends of the cooling pipe respectively. The cooling pipe is sequentially composed of an inner sleeve, an outer sleeve, a heat preservation layer and a protection layer from inside to outside. Through holes are formed in the two ends of the side wall of the outer sleeve respectively. A water inlet steel pipe is installed on the through hole close to the raw gas inlet flange. A vapor outlet steel pipe is installed on the through hole close to the raw gas outlet flange. An annular expansion joint section is arranged at the portion, between the water inlet steel pipe and the vapor outlet steel pipe, of the outer sleeve. The high temperature structural strength and high temperature breakage resistant capacity of the cooling device are remarkably improved, the heat transfer behavior of the pipe wall of the inner sleeve of the cooling device is improved, the radial temperature distribution of the pipe wall is optimized, the efficient function coordination of multiple layers of materials is achieved, and the comprehensive use performance of the inner sleeve is improved; the aim of long-term efficient and stable running of the ascension pipe raw gas evaporative cooling device is finally achieved.

Description

technical field [0001] The invention relates to the technical field of coking energy saving and environmental protection, in particular to a coke oven riser raw gas vaporization cooling device and a preparation method thereof. Background technique [0002] As we all know, the temperature of the raw coal gas escaping from the riser of the coke oven carbonization chamber is 650-850°C, and the heat taken out accounts for about 35% of the total heat consumption of coking. Under the conventional process, a large amount of circulating ammonia water at 70-75°C is sprayed on the bridge pipe to reduce the temperature of the high-temperature raw gas to 95-105°C, and then enter the recovery gas purification system, which not only consumes a large amount of ammonia water, but also increases the power consumption in the system. It also deteriorates the operating environment of the coke oven, and also causes a large amount of waste heat to be wasted. [0003] For a long time, researchers...

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Problems solved by technology

[0004] Based on the above, it can be seen that although various types of riser gas waste heat recovery devices have been developed at home and abroad, they are mainly improved researches on the damage phenomenon in the process of technological development, and the effectiveness and reliability of the improvement measures are mostly unseen Get the actual production verification

At the same time, although the patented technology of the waste heat recovery device for raw gas in the rising pipe provides ideas for improvement measures for related damage problems, it does not involve how to implement it, what materials and preparation methods should be used, and how to ensure the quality of preparation and performance. Furthermore, the measures to improve the heat conduction of the device provided by the relevant patents, such as filling the aluminum nitride heat conduction material with high thermal conductivity, although the thermal efficiency of the vaporization cooling device has been improved, it will inevitably cause the gas-solid exchange where the heat transfer temperature difference is concentrated on the raw gas side. The thermal process causes the surface temperature of the heat exchange wall to drop, which increases the risk of condensation and coking of tar vapor from raw coal gas, which is not conducive to the safe and stable operation of the vaporization cooling device of the riser; another example is the spraying of an efficient heat-absorbing anti-corrosion coating on the inner surface of the riser Although the measures strengthen the heat transfer between the raw gas and the inner wall of the riser, at the same time, the temperature of the metal substrate is increased, which intensifies the high-temperature damage of the metal material on the inner wall of the riser; therefore, there are no reports of actual production and application of the relevant patented technology

In addition, due to the differences in the coking coal blending structure and coking process of each coking plant, the composition properties of the raw gas in the riser and the temperature range of the raw gas during the coking turnaround time and the rapid cooling and heating speed are significantly different. How to improve the waste heat recovery device for the actual The ability to adapt to production conditions still requires in-depth research

Furthermore, the flame purging and cleaning of the coking of raw gas and tar vapor in the riser of the coke oven leads to a sharp rise in the local temperature of the riser, which is one of the key factors for the long-term stable operation of the waste heat recovery device of the riser, especially for long-term sudden The alternating thermal stress of the hot working condition will easily crack the welding seam of the recovery device, causing a large amount of water leakage into the carbonization chamber of the coke oven, which not only affects the stable production of coking, but also endangers the damage of the coke oven body

There are only reports on single test or short-term operation results of related technologies. How to achieve long-term stable operation and improve waste heat recovery efficiency needs further research. Therefore, at present, most coke oven risers at home and abroad do not have waste heat recovery systems. Waste heat of raw gas is lost by spraying ammonia water for cooling

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