Method and equipment for recycling crude gas waste heat in ascending pipes of coke oven

Abstract

The invention relates to a method and equipment for recycling crude gas waste heat in ascending pipes of a coke oven, and belongs to the technical field of the recycling of the crude gas waste heat of coke ovens. In the technical scheme, the method comprises the following steps that a centralized steam dome collects and separates steam and water of heat exchangers corresponding to all ascending pipes of the coke oven, and the separated steam is conveyed to the next process to be used from a steam outlet of the centralized steam dome; the separated water is pumped into a water feeding header pipe by a circulating water pump from a water outlet of the centralized steam dome and is distributed to the heat exchangers corresponding to all ascending pipes of the coke oven by each connection pipe, so that the water absorbs heat in the heat exchangers to be vaporized partially and flows into a backwater header pipe by the connection pipes, and the vaporized steam water mixture flows into the centralized steam dome by the backwater header pipe; and steam-water separation is performed, so that the separated steam flows out to be used in the next process, and the separated water flows into the next circulation again. Compared with a mode of controlling dozens of steam domes and hundreds of steam domes, the invention has the advantages that: the method and the equipment are easy and convenient to operate and control, namely only one centralized steam dome is needed to be controlled.

Description

technical field [0001] The invention relates to a coke oven rising pipe raw gas waste heat recovery method and equipment, and belongs to the technical field of coke oven waste gas waste heat recovery and utilization. Background technique [0002] As far as thermal energy utilization is concerned, a wealth of background technology has been accumulated in the industrial field since the British Industrial Revolution for hundreds of years. However, since the coke enterprises used the carbonization chamber method to burn coke in these background technologies, the waste heat of the high-temperature coke oven raw gas in the rising pipe has not been effectively utilized, and the heat can only be wasted by cooling down with circulating ammonia. For example, adopt water jacket method etc., all without success. In recent years, neither the heat pipe technology nor the heat transfer oil technology can run stably for a long period. The main problem is that none of these background techn...

AI Technical Summary

Problems solved by technology

In recent years, neither the heat pipe technology nor the heat transfer oil technology can run stably for a long period. The main problem is that none of these background technologies has overcome the difficulty of heat exchange of coke oven raw gas, and tar sticks to the heat exchange surface and clogged with flocs. , water leakage on the heat exchange surface affects coke production; or when other parts of the heat exchange system fail to stop working, the carbonization chamber method, a furnace of coke is not produced, and the furnace cannot be shut down in a short period of time, so the heat pipe bursts. Problems such as overheating and coking of heat transfer oil

In the background technology, the Chinese invention patent application "coke oven raw gas riser waste heat recovery device", application number 200810122711.0 (CN101614498B), proposed a device for recovering coke oven waste gas riser waste heat with separate heat pipes, the technical principle is feasible , but since the application of the invention, there have been no reports of successful promotion and application in industrial production for more than three years

The reasons are as follows: first, there are difficulties that the designer did not expect, such as difficulty in handling, sticking tar, etc.; since the solution is to put the exothermic end of the separate heat pipe into the steam drum, which is a steam-water separation container, it needs There are pressure gauges, liquid level gauges, thermometers, safety valves, etc. These instruments are the basis for guiding operators to control and adjust during operation; each coke oven has tens of hundreds of risers, and the heat release section of each riser They are all placed in the corresponding steam drums. There are too many steam drums and correspondingly too many instruments are required. Under the normal failure rate, the task of repairing and replacing is too heavy. The manpower required for safe operation is also too much, which is unexpected to the designers who study the principle of heat transfer; the second is that the structure of the heat-absorbing end in the shell of the riser needs to be obliquely penetrated into and out of the inner wall twice, so that The structure is complex and difficult to manufacture, and what is more important is that the riser pipe has poor ability to withstand thermal expansion deformation and thermal stress when the workload changes, and there are many cracking failures during operation

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