Combined steam generation device with preheating water tank and method for generating steam

Abstract

The invention relates to a combined steam generation device with a preheating water tank. The device comprises a soft water treater, a normal-pressure water heating system and a steam production system which are sequentially connected in series through pipelines in a communicating mode, wherein the steam production system comprises a steam boiler, a variable-frequency water feeding pump, a check valve and a preheating water inlet pipeline, the normal-pressure water heating system comprises a preheating electromagnetic boiler, a preheating water tank, a circulating water pump, an electromagnetic valve and a cold water pipeline, and an outlet of the soft water treater communicates with the upper part of the preheating water tank through the cold water pipeline. During work, incoming water isinput into the preheating water tank, the preheating electromagnetic boiler is started at night, the circulating water pump circularly inputs water in the preheating water tank into the preheating electromagnetic boiler for heating, in the daytime, a combustor of a gas-steam boiler is started, hot water in a waste heat recovery device is further heated through flue gas, the hot water enters the gas-steam boiler, and steam is generated.

Description

technical field [0001] The present invention relates to the technical field of steam supply, in particular to a steam generator, in particular to a combined steam generating device for preheating water by using low-peak power at night and normal power during the day. Background technique [0002] Many fields such as hotels, laboratories, and industrial manufacturing need to use steam. Usually, the steam comes from municipal centralized steam supply system, regional steam supply system or distributed steam supply system. The steam generator is the core component of the steam supply system. Steam generating devices mainly include power plant extraction steam devices, coal-fired boilers, gas-fired boilers, oil-fired boilers, resistance boilers, electromagnetic boilers and biomass boilers. In essence, a steam generator is an energy conversion device, and the development of steam generator technology pursues the degree of impact on the environment, energy conversion efficiency an...

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Problems solved by technology

However, the two boilers only have one steam pipe (exit) on the top of the electric boiler; in this way, the steam generated by the gas-fired boiler must be output through the electric boiler, that is, the operation of one boiler bears the heat dissipation loss of the two boilers. , undoubtedly low efficiency and high operating costs

In addition, the above two boilers are equipped with a water supply channel, which is transported to the electric boiler through the condenser in the exhaust pipe of the gas boiler, and the condenser is a vulnerable part, which is affected by the high-temperature corrosive flue gas in the exhaust pipe , once damaged, the water replenishment is interrupted, the two boilers are forced to stop at the same time, and the reliability is poor; moreover, the circulating water supply and return coil heating system of the gas boiler gradually becomes saturated high-temperature feedwater from the low-temperature feedwater at the initial operation, and because of The coiled tube is heated unevenly in the furnace, whether steam explosion will occur in the highly heated coiled tube, this safety is worth considering

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