The exhaust gas produced by the combustion of coke oven gas in the combustion chamber is discharged into the atmosphere through the chimney after recovering part of the sensible heat from the lattice brick of the regenerator. The temperature of these exhaust gases before entering the chimney is 260-300 ℃, and the large amount of waste heat contained in the exhaust gases discharged through the flue and chimney cannot be effectively utilized, wasting the available waste heat energy. With the increase of national energy conservation and emission reduction policies and monitoring efforts and the need for enterprises to improve their competitiveness, such as the use of this part of the heatWaste heat boilerThe system recovery can not only develop and utilize the waste heat resources of coke oven tail gas reasonably and effectively, but also solve the self-use steam required for coking production, realize the energy saving and consumption reduction of enterprises and improve economic benefits. To this end,Changlin EnergyResearch and development of coke oven flue waste heat recovery technology project (obtained a number of patent certificates), take measures to the coke oven exhaust gas.waste heat recovery and utilizationIt can effectively reduce energy consumption and promote sustainable development.

Through online opening in the flue, Changlin Energy adopts heat pipe technology and nickel-based brazing technology, and a heat pipe evaporator is installed between the coke oven flue and the chimney by connecting the flue as heat exchange equipment, and the flue gas waste heat recovery is carried out on this part of the flue gas. At the same time, anti-dew point temperature corrosion technology is adopted to ensure the stable and reliable operation of the waste heat recovery system. And produce 0.8MPa low pressure saturated steam for production use, greatly reducing the production cost, and play the effect of energy saving and environmental protection.

Taking a coking plant with 1.3 million T/a as an example, it can produce 0.7MPa steam 138000 T/a, realizing economic benefit of 23.46 million yuan/a. At the same time, the project is an energy-saving and emission-reduction project supported by the current national policy. According to relevant national policies and regulations, the project can obtain a national policy support fund of 4.017 million yuan/a, with a total benefit of 27.477 million yuan/a.