Heat supply unit total heat recovery system with nearly zero energy consumption and heat supply control method thereof

Abstract

The invention discloses a heat supply unit total heat recovery system with nearly zero energy consumption and a heat supply control method thereof. The heat supply unit total heat recovery system comprises a heat source system, a heat network system and a central heat supply control system, wherein the heat source system comprises a boiler, a dust remover, an induced draft fan, a desulfurizing tower, a chimney and a steam turbine; the heat network system comprises an original heat network system and a new heat network system; the original heat network system comprises a heat network heater, anoriginal heating user end, a first plate heat exchanger and a heat network circulating pump; and the new heat network system comprises a second plate heat exchanger, a heat pump heat supply unit, a new heat network heat supply control pipeline and a new heating user end. Through reducing the primary network water returning temperature and enlarging the primary network water supply and returning temperature difference, the heat supply unit total heat recovery system greatly improves the heat conveying capacity of the original heat network system, so that the investing and operating cost of theheat network system is reduced to the maximum on the condition of meeting the heating demand of the newly added heat network system; and with adoption of the heat supply control method provided by the invention, heat supply of the new heat network system saves more energy and is more efficient.

Description

technical field [0001] The invention relates to a total heat recovery system of a heat supply unit with near zero energy consumption and a heat supply control method thereof. Background technique [0002] At present, more than 90% of the coal-fired industrial boiler desulfurization facilities in my country use the limestone-gypsum wet desulfurization process. This desulfurization process generally uses spray washing technology to remove sulfur dioxide in the flue gas. At the same time, a large amount of water is gasified and then enters In the flue gas, the temperature of the flue gas is reduced to about 50°C, and it is discharged into the atmosphere through the chimney in a saturated state, and it is easy to form a "wet plume" (commonly known as "big white smoke", "white mist", etc.) at the chimney outlet. "Smoke plume" is likely to cause local air pollution. At the same time, a large amount of boiler flue gas has to be discharged from the desulfurization system from the 150-...

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Problems solved by technology

[0002] At present, more than 90% of the coal-fired industrial boiler desulfurization facilities in my country use the limestone-gypsum wet desulfurization process. This desulfurization process generally uses spray washing technology to remove sulfur dioxide in the flue gas. At the same time, a large amount of water is gasified and then enters In the flue gas, the temperature of the flue gas is reduced to about 50°C, and it is discharged into the atmosphere through the chimney in a saturated state, and it is easy to form a "wet plume" (commonly known as "big white smoke", "white mist", etc.) at the chimney outlet. "Smoke plume" is likely to cause local air pollution. At the same time, a large amount of boiler flue gas has to be discharged from the desulfurization system from the 150-200 °C at the entrance of the desulfurization tower to about 50 °C. This method not only wastes a lot of water, but also brings latent heat of vaporization

[0003] The central heating system of thermal power plants in northern my country (such as figure 1 As shown), the circulating water delivery form of the primary and secondary networks is generally adopted. The temperature difference between the supply and return water of the low-temperature water heating system of the primary network is generally 20-40°C, and the return water temperature of the primary network is generally 40-60°C. The water temperature difference is small, and the transmission and distribution capacity of the heat network is small. With the acceleration of urbanization and the improvement of people's living standards, the number of end heat users has increased sharply, resulting in the existing central heating system being unable to meet the new heating demand. Improve the heating capacity of the heating network system, which can be realized through the transformation of the heating network, but the investment cost of the heating network transformation is relatively high, and it has a great impact on urban traffic and residents' production and life, resulting in more troublesome implementation

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