Low-grade smoke organic rankine cycle waste heat generating system of heating furnace in steel rolling plate plant

Abstract

The invention relates to a low-grade smoke organic rankine cycle waste heat generating system of a heating furnace in a steel rolling plate plant, wherein air, a coal gas heat exchanger and a working medium evaporation chamber are in the heating furnace; the working medium evaporation chamber is filled with normal pentane and is provided with a working medium tubular evaporator; a steam outlet of the working medium evaporator is connected with a steam inlet of a steam turbine generator set through a pipeline; the steam outlet of the steam turbine generator set is connected with a steam inlet of a fixed tube-plate type heat exchanging condenser through a pipeline; a liquid outlet of the fixed tube-plate type heat exchanging condenser is connected with a liquid inlet of a seal circulating pump through a pipeline; a liquid outlet of a working medium seal circulating pump is connected with a working medium liquid inlet of the evaporation chamber through a pipeline; a water outlet of a cooling tower is connected with a water inlet of a water circulating pump through a pipeline; a water outlet of the water circulation pump is connected with a cooling water inlet of the fixed tube-plate type heat exchanging condenser through a pipeline; and a cooling water outlet of the fixed tube-plate type heat exchanging condenser is connected with the cooling tower through a pipeline. According to the invention, the waste heat of tail gas of the heating furnace at the temperature of 300-100 DEG C can be recycled.

Description

technical field [0001] The invention relates to a heat energy recovery system, in particular to a low-grade flue gas organic Rankine cycle waste heat power generation system of a heating furnace in a steel plate rolling workshop. Background technique [0002] The utilization of industrial waste heat is an important aspect of industrial energy conservation, which can be regarded as the development and utilization of industrial secondary energy. From the point of view of modern thermophysics, the same amount of heat has different values ​​available at different temperatures. The lower the temperature of the waste heat source, the lower the grade of waste heat. Industrial flue gas waste heat can be classified according to its temperature, generally can be divided into three categories: (1) high temperature flue gas (>600°C); (2) medium temperature flue gas (300~600°C); (3) low temperature flue gas Flue gas (<300°C). For the waste heat of high and medium temperature flu...

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Problems solved by technology

[0007] 3. Disadvantages of existing products: 1. Low-temperature waste heat power generation uses water as the working medium, and it is difficult to recover exhaust waste heat in the range of 300-100 °C; 2. Generally, waste heat recovery devices that use water as the working medium need to build a waste heat boiler room. The cascade utilization of energy instinctively increases the energy consumption of the enterprise; 3. The structure is relatively complex, the cost is high, and the low-grade waste heat is not fully utilized

For example, pipeline components, valves, etc., may be more complicated; the unit operating in the power grid has a more complicated adjustment mechanism; 4. The possibility of moisture being easily formed when using water as the working medium for waste heat power generation, and when high-speed small water droplets hit the steam turbine. Possibility of corrosion damage; 5. Compared with n-pentane, the density of water vapor is small and the specific volume is large, which can make the design of steam turbine (especially the height of its last stage blade), exhaust pipe and pipe in condenser larger size

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