What parts does the gas hot water boiler body include? What's the use of each?
The gas hot water boiler body includes the pot and the boiler body: refers to the steam and water system of the gas hot water boiler, which is composed of the preheating vaporization system of water and the superheated reheating system of dry steam. The function is to further heat and vaporize the feed water of gas hot water boiler heated by high pressure heater in order to achieve the purpose of blowing steam turbine.
System composition: economizer, drum, drop pipe, water wall, superheater, reheater economizer high pressure heater outlet feed water is introduced into economizer, in economizer tube to absorb the heat of flue gas and fly ash outside the tube, The water temperature rises to about 300 ℃, and the drum water comes out of the economizer and enters the arrangement along the pipeline. A bubble at the top of a gas-fired hot water boiler. The lower part of the drum is water and the upper half is steam. The high pressure unsaturated water reaches the lower header at the bottom of the gas hot water boiler along the falling pipe at the bottom of the bubble, and many water pipes are installed in parallel on the lower header around the bottom of the gas hot water boiler.
These pipes flow upward in the water wall pipe to absorb the radiative heat transfer of the central flame in the furnace and the convective heat transfer of high temperature flue gas. Because the endothermic capacity of steam is much smaller than that of water, it is stipulated that the vaporization rate in the water wall should not be more than 40%. Otherwise, it is easy to melt and burst the water wall water pipe because the working fluid is too late to absorb heat. Drop tube action It is to send the water in the drum to the header under the water wall to establish a water cycle. The water in the header under the water wall returns to the gas hot water boiler through the water wall, completes the steam separated by the circulating superheater between the water wall and the drum, and draws out the steam from the top of the drum. First enter the roof superheater laid on the top of the furnace, and then flow through the coated wall superheater, low temperature superheater, screen superheater, to the high temperature superheater, heating up to the rated temperature and then send it to the steam turbine to do work.
The reheater, the large gas hot water boiler, is also equipped with a reheating device, and its steam comes from the discharge in which the temperature and pressure are reduced after the work is done by the high pressure cylinder. Gas, these exhaust is sent to the reheater for heating, and then sent back to the steam turbine, the low pressure cylinder continues to do work. Furnace body: refers to the furnace body and combustion system of gas-fired hot water boiler. Its function is to fully burn and heat the fuel in the furnace, and to transfer as much heat as possible to the working fluid, and to complete the water heating in the economizer and water wall water pipe. The dry steam in the superheater and the reheater tube is heated, and the air in the air preheater tube is heated. System composition: burners, furnaces, air preheaters. Production process: raw coal from the coal yard is transported through belt conveyor to the higher position of the raw coal bunker, and the raw coal flows out from the bottom of the raw coal bunker. The coal feeder is evenly fed into the coal mill to grind into pulverized coal. The atmosphere of nature is sent by the air supply fan to the air preheater arranged in the vertical flue of the gas-fired hot water boiler to receive the heating of the flue gas and recover the waste heat of the flue gas. The hot air about 250 degrees from the air preheater is divided into two ways: the burners of the gas-fired hot water boiler are introduced directly as the secondary air to the furnace to assist in combustion;
The other way is the introduction of coal mill inlet, used to dry, transport pulverized coal, this part of the hot air called primary air. The mixture of dry pulverized coal and primary air, which is highly liquid, is transported to the coarse powder separator through the pipeline for separation of the coarse powder, and the coarse powder is separated. The powder is sent back to the inlet of the coal mill for re-grinding, while the qualified fine powder and the primary air mixture are sent to the fine powder separator for powder, gas separation, and the separated fine powder is sent to the pulverized coal storage for storage.
According to the heat load of the gas hot water boiler, the pulverized coal feeding machine controls the pulverized coal flow rate released from the bottom of the pulverized coal bunker, and the primary air separated from the fine powder separator is used as the power to transport the pulverized coal. After the pressure of the powder remover, it is mixed with the fine powder sent by the powder feeder again to form a mixture of gas and powder, and the burners are sprayed into the furnace to burn.
