Utilization method of medium and low temperature waste heat and its pressure-reducing heat-absorbing steam power cycle system

Abstract

The invention provides a medium-and-low-temperature waste heat utilization method which can effectively utilizing medium-and-low-temperature waste heat and solves the problem that the utilization rate of the medium-and-low-temperature waste heat is low so that a large amount of the waste heat can be widely used. In the aspect of energy utilization layout, the method has an important strategic meaning on energy conservation and emission reduction. The method is characterized by including the following steps that 1, high-pressure liquid is expanded so that the flow speed of the high-pressure liquid can be increased and the pressure of the high-pressure liquid can be reduced; 2, the liquid with the pressure reduced enters a heater to be heated and gasified, in the heater, the medium-and-low-temperature waste heat heats the liquid, the liquid absorbs heat from the medium-and-low-temperature waste heat and is gasified, and the flow speed of steam is quickly increased; 3, steam flow formed after the liquid is gasified performs pressure expansion in a pressure expansion pipe, the kinetic energy of the steam flow is reduced, pressure and temperature of the steam flow are increased, high-temperature high-pressure steam is generated, and utilization of the medium-and-low-temperature waste heat is achieved. The invention provides a pressure-reducing heat-absorbing type steam power circulating system at the same time.

Description

technical field

[0001] The invention belongs to the technical field of heat energy utilization and treatment and equipment, and in particular relates to a method for utilizing medium and low temperature waste heat and a pressure-reducing heat-absorbing steam power cycle system thereof. Background technique

[0002] The steam power cycle of the steam engine and steam turbine that converts steam heat energy into mechanical energy, the state change process of its working medium is carried out according to the Rankine cycle. In order to improve the thermal efficiency of the Rankine cycle, it is generally necessary to increase the initial parameters of the steam entering the steam power plant, that is, to increase the initial steam pressure and temperature, so the initial parameters of modern large-capacity steam power plants are all high temperature and high pressure without exception. However, to generate high-temperature and high-pressure steam, a high-temperature heat source ...

Examples

Embodiment Construction

[0014] See figure 1 ,

[0015] A method for utilizing medium and low temperature waste heat, comprising the following steps,

[0016] (1) The high-pressure liquid from the feed pump 1 expands in the expansion pipe 2, so that the flow rate of the high-pressure liquid is accelerated and the pressure drops. When the pressure drops to the point where it can absorb heat from the medium and low temperature waste heat and vaporize it, it enters the heater 3;

[0017] (2) The depressurized liquid enters the heater 3 to be heated and vaporized. In the heater 3, the medium and low temperature waste heat heats the liquid, and the liquid absorbs heat from the medium and low temperature waste heat to vaporize, and the steam flow rate increases rapidly;

[0018] (3) The vapor flow formed after the vaporization of the liquid is diffused in the diffuser tube 4, its kinetic energy decreases, its pressure and temperature rise, and it becomes high-temperature and high-pressure steam;

[0019] ...

technical field

[0001] The invention belongs to the technical field of heat energy utilization and treatment and equipment, and in particular relates to a method for utilizing medium and low temperature waste heat and a pressure-reducing heat-absorbing steam power cycle system thereof. Background technique

[0002] The steam power cycle of the steam engine and steam turbine that converts steam heat energy into mechanical energy, the state change process of its working medium is carried out according to the Rankine cycle. In order to improve the thermal efficiency of the Rankine cycle, it is generally necessary to increase the initial parameters of the steam entering the steam power plant, that is, to increase the initial steam pressure and temperature, so the initial parameters of modern large-capacity steam power plants are all high temperature and high pressure without exception. However, to generate high-temperature and high-pressure steam, a high-temperature heat source ...

Examples

Embodiment Construction

[0014] See figure 1 ,

[0015] A method for utilizing medium and low temperature waste heat, comprising the following steps,

[0016] (1) The high-pressure liquid from the feed pump 1 expands in the expansion pipe 2, so that the flow rate of the high-pressure liquid is accelerated and the pressure drops. When the pressure drops to the point where it can absorb heat from the medium and low temperature waste heat and vaporize it, it enters the heater 3;

[0017] (2) The depressurized liquid enters the heater 3 to be heated and vaporized. In the heater 3, the medium and low temperature waste heat heats the liquid, and the liquid absorbs heat from the medium and low temperature waste heat to vaporize, and the steam flow rate increases rapidly;

[0018] (3) The vapor flow formed after the vaporization of the liquid is diffused in the diffuser tube 4, its kinetic energy decreases, its pressure and temperature rise, and it becomes high-temperature and high-pressure steam;

[0019] ...

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