Introduction to Waste Heat Boiler: Shandong Boiler Tube Waste Heat Boiler Manufacturer

Description :

　　The rising pipe cluster used to generate saturated steam is called an evaporator. Power plant boilers also have economizers and superheaters, all of which are composed of pipe clusters

　　Cheng. The water entering the steam drum is first heated in the economizer, and then enters the evaporator through the steam drum and downcomer, which can improve the efficiency of the evaporator and the boiler. The saturated steam generated by the evaporator is output through the steam drum and then enters the superheater for heating

　　Overheated steam can ensure the efficiency and safety of the system by driving the steam turbine with superheated steam.

　　Structure and process of waste heat boiler

　　The gas discharged from the gas turbine has a temperature of up to 600 degrees Celsius and still has high energy. By sending these high-temperature gases to the boiler and heating water into steam to drive the steam turbine, the generator can generate electricity, which can increase the power generation capacity and thermal efficiency of the combined cycle unit by about 50%. The boiler that generates steam by using the waste heat from gas turbine exhaust is called a waste heat boiler.

　　From the appearance, the boiler mainly consists of an inlet flue, furnace body, steam drum, and chimney. There are dense pipelines inside the furnace, and the water pump feeds the water to be heated into these pipelines. The high-temperature gas discharged from the gas turbine heats the water in the pipelines into high-pressure steam. The following is the appearance of the waste heat boiler (the inlet flue is a section).

　　Structure of waste heat boiler

　　The waste heat boiler adopts a modular structure for easy transportation and installation. The module is composed of tube clusters, which are serpentine tube components made up of dozens of tubes. There are upper and lower headers at both ends of the module, which are the heating components of the boiler. Water is heated by high-temperature gas from the outside inside of the module.

　　In order to better transfer heat, fins (also known as fins) are welded on the surface of the pipeline to increase the heat transfer area of the pipeline. The following figure shows a small section of the pipeline welded with fins.

　　Opening the side wall of the boiler, it can be seen that there are multiple modules inside. The actual boiler has nearly 20 modules, most of which are evaporator, economizer, and superheater modules, in addition to the reheater module.

　　Large gas turbine power plants adopt a three pressure reheating cycle waste heat boiler, and the steam water system mainly consists of three parts: low pressure, medium pressure, and high pressure. It can simultaneously generate low-pressure superheated steam, medium pressure superheated steam, and high-pressure superheated steam, which respectively drive low-pressure turbine, medium pressure turbine, and high-pressure turbine, and can fully convert the thermal energy of gas into mechanical work.

　　The low-pressure section consists of a low-pressure economizer, a low-pressure steam drum, a low-pressure evaporator, and a low-pressure superheater. Cold water from the condensate pump, through

　　After preheating the low-pressure economizer, it is input into the low-pressure steam drum, which is connected to the evaporator below. The water is heated into saturated steam in the low-pressure evaporator and rises to the low-pressure steam drum. Saturated steam is output from the low-pressure steam drum and heated by the low-pressure superheater,

　　Generate low-pressure superheated steam to drive the low-pressure steam turbine to rotate and do work.

　　The medium pressure section consists of a medium pressure economizer, a medium pressure steam drum, a medium pressure evaporator, a medium pressure superheater, and a reheater. The water coming out of the low-pressure steam drum is injected by the medium pressure feedwater pump

　　Continue heating in the medium pressure economizer, then enter the medium pressure steam drum, where it is heated into saturated steam in the medium pressure evaporator and rises to the medium pressure steam drum. The saturated steam output from the medium pressure steam drum is heated by the medium pressure superheater and then combined with the high-pressure steam turbine

　　The steam discharged from the machine is mixed and heated together by the reheater to produce medium pressure reheated steam, which is used to drive the medium pressure steam turbine to rotate and do work.

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• Introduction to Waste Heat Boiler