Full-condensation boiler

Abstract

The invention discloses a full-condensation boiler. A boiler body is connected with a hot and cold water regionalized water tank and an outer circulating water path of the hot and cold water regionalized water tank; the hot and cold regionalized water tank is divided into a cold water region and a hot water region; the outer circulating water path includes an energy saving device, a condenser, a circulating pump and a feed pump; room-temperature softened water enters the cold water region, and enters the condenser through the circulating pump, and goes back to the hot water region, and enters the energy saving device through the feed pump; after the energy saving device is connected with the independent hot and cold water regionalized water tank, soft water which flows circularly under normal pressure in the energy saving device constantly to recover waste heat and store heat regardless of whether water is supplemented in the operation of the boiler; the feed-water temperature of the boiler can be improved, and big fire burning pressure-increasing time can be shortened, and fuel consumption can be reduced. The full-condensation boiler can be adopted as a boiler in which water vapor content in flue gas is high, especially adopted as a gas-fired boiler.

Description

technical field [0001] The invention relates to a boiler, especially a fully condensing boiler. Background technique [0002] In boilers, especially gas-fired boilers, the flue gas is cooled to the original temperature after the fuel is completely combusted. The heat released when the water vapor in it is discharged in the state of condensed water is called high calorific value, and the heat generated when the water vapor is still in the state of steam The heat released is called low calorific value. [0003] The high calorific value of the fuel is numerically greater than its low calorific value, and the difference is the latent heat of vaporization of water vapor. The proportion of water vapor in the flue gas after combustion is different for different fuels. Natural gas contains a relatively large proportion of hydrogen elements, and the content of water vapor in the flue gas produced by combustion is large. The high calorific value of natural gas is 9450kcal / Nm3—the h...

AI Technical Summary

Problems solved by technology

The beneficial effect of the present invention is that independent hot and cold partition water tanks are set, and after the economizer is connected to the independent water tank, regardless of whether the boiler is replenishing water during operation, there is always soft water circulating in the economizer at normal pressure to recover waste heat and store heat; Conventional economizers have potential safety hazards such as intermittent heat exchange, cavitation, boiling, and pressure operation, which solve the problems of intermittent recovery of waste heat and low efficiency; soft water circulates and heats in the condenser tube at normal pressure, making it From room temperature to 40-90°C, enter the deaerator or directly supply water to the boiler. The steam consumed by thermal deaeration accounts for about 10% of the total evaporation. After increasing the water temperature of the deaerator, the steam for self-use deaeration is greatly reduced. Increase the temperature of boiler feed water, shorten the boosting time of high-fire combustion, and reduce fuel consumption

Images