A waste heat boiler is a boiler that utilizes the sensible heat from various industrial waste gases, waste materials, or sewage in various industrial production processes or their combustible substances to ignite and establish a heat value, or a boiler that utilizes the heat value of high-temperature flue gas discharged from a small steam turbine.
1、 The basic principle of waste heat boiler; 50000m ³ 1100 ℃ flue gas waste heat steam boiler 6 ton waste heat boiler
The design of a waste heat boiler scheme is a complex and complex project with high requirements for reliability and rationalization.
The waste heat boiler is divided into two types: fire tube heat exchanger and tap water pipeline type. Its structure is similar to industrial production boilers. The waste heat boiler with a fire tube heat exchanger has a large water output, and the steam pressure fluctuation is relatively small under the conditions of fluctuations in flue gas and gas consumption. However, its water surface evaporation and steam pressure are limited by the diameter of the boiler drum and operating specifications.
In addition, due to poor cooling and high temperature thermal stress, the hydraulic steel pipes and heads of the exhaust system are not suitable for using such boilers when the smoke temperature is high (over 600 ℃) and the head is thick. Instead, it is advisable to use a tap water pipeline waste heat boiler. The water pipe waste heat boiler has two circulation system modes: assisted circulation and natural circulation.
Waste heat boiler is a boiler that utilizes gases or industrial waste gas, sewage from industrial production processes, as well as the heat value of some motor equipment exhaust pipes to create steam or boiling water. Waste heat boilers are very important energy-saving equipment. The exhaust systems for various melting furnaces and kilns have temperatures ranging from 650 to 1250 ℃; The exhaust pipe temperature of small steam turbines and diesel engines and other motor equipment is 370-540 ℃.
Installing a waste heat boiler to digest a part of the heat value in such exhaust system can significantly improve the utilization rate of thermal engineering of the full management system. For example, after installing waste heat boiler in steel rolling heating furnace, the utilization rate of full operating system thermal engineering can even be increased by about one time. 50000m ³ 1100 ℃ flue gas waste heat steam boiler 6 ton waste heat boiler
The temperature of the flue gas entering the waste heat boiler is a factor in the management decision-making of the reasonable layout method of the heating surface of the waste heat boiler. When the flue gas temperature in foreign countries ranges from 400 to 900 ℃, it is important to install convection tube bundles in the boiler and not set a furnace chamber; However, when the melting point of smoke and dust is low, it is also necessary to set up a cooling furnace room to control the temperature of the smoke entering the safe passage of the convective heat transfer kitchen flue, and to avoid bridging between the convective heat transfer tube rows with coal ash
