Cyclic heating method for gas or fuel boiler saturated water

Abstract

The invention relates to a cyclic heating method for gas or fuel boiler saturated water. The cyclic heating method comprises the following steps: (1) supplying water by a water tank first, forming a closed cyclic heating system by a gas or fuel boiler, a pipeline, an exhaust pipe valve, a main circulating pump and heat consumption equipment, and forcibly charging water to exhaust air by using the main circulating pump; (2) starting a combustor of the gas or fuel boiler to combust and heat; (3) heating circulating water to a saturated state at 130 to 250 DEG C, and performing cyclic heating on a material of the heat consumption equipment; (4) when the temperature of the material reaches an upper limit temperature, stopping the fire of the combustor or regulating the fire of the combustor to soft fire, and continuously operating the main circulating pump. When the temperature of the material is decreased to a lower limit temperature, the combustor is started and is regulated to medium fire or big fire for heating continuously. When the temperature of the material reaches the upper limit temperature, the combustor is closed again or regulated to the soft fire, and the steps are circulated reciprocally until a heating production period is finished. According to the cyclic heating method for the gas or fuel boiler saturated water, because heated saturated water does not produce phase change, sensible heat is only consumed, and latent heat is not consumed, so that an energy saving effect is obvious.

Description

technical field [0001] The invention relates to the technical field of heat energy saving, in particular to a method for circulating saturated water in a gas or oil-fired boiler. Background technique [0002] The saturated steam produced by gas or oil-fired boiler consumes a lot of energy and costs, not only the latent heat of vaporization, but also the sensible heat. For example, heating saturated steam at 150°C requires consumption of latent heat of vaporization of 506 kcal / kg, sensible heat of 151 kcal / kg, and a total of 657 kcal / kg. Use saturated steam at 150°C as the heat source of the heating equipment, and heat it through the interlayer, coil, or tube of the heating equipment. When the saturated steam at 150°C drops to about 130°C, it will be discharged through the steam trap to separate the steam and water. When vented, the temperature of condensed water is only 70°C to 80°C under normal pressure. Even if the latent heat of phase change is released outside the heat-...

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Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is to provide a circulating heating method using gas or oil-fired boilers to produce saturated water, which solves the problem of the large amount of gas or fuel used as a heat source for heating by gas or oil-fired boilers, and the high cost of gas or fuel. The problem of large emission of greenhouse gases also solves the problem of boiler steam being used as a heat source that cannot be circulated for heating and large waste heat loss, and also solves the problem of large volume, large floor space and high investment for steam-producing boilers

The steam cannot be recirculated and heated, and the waste heat steam cannot be recovered, resulting in the problem of energy waste

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