Secondary heat exchange station heating system based on jet type heat pump for recovering primary grid backwater complementary energy

Abstract

A secondary heat exchange station heating system based on jet type heat pump for recovering primary grid backwater complementary energy belongs to the energy technical field, and is characterized in that a heat exchanger is added on the base of a traditional jet type heat pump system. The system enables generator backwater and condenser backwater to exchange heat by using the heat exchanger in the system under the condition that total water supply of a primary grid is kept unchanged so as to lower primary grid backwater temperature, recover the primary grid complementary energy, improve secondary grid water supply temperature and increase total heat supplying capacity of a heat supply network. The system and the heat exchanger of an original heat exchange station adopt a parallel operation method, the heat pump system can safely quit operation at any time while achieving heating of secondary grid backwater, and original working conditions of the original heat exchange station can be recovered, thereby having reliable safety. The system does not need to change original primary grid pipelines, does not need to add primary grid pump work, and can increase by 60% of the total heat supplying capacity of the whole heat supply network to the maximum extent, and the primary grid backwater temperature is 30 DEG C.

Description

technical field [0001] The invention belongs to the field of energy technology, in particular to a secondary heat exchange station heating system based on a jet heat pump that can make full use of the heating heat of a thermal power plant's primary network to recover the residual energy of the return water of the primary network. Background technique [0002] Energy shortage and environmental pollution have become major problems that the world must face and solve. Saving energy, improving energy utilization, and protecting the environment to achieve sustainable development has become a theme of today's era. At present, the traditional central heating heat exchange system uses indirect heat exchange devices between steam and water (such as shell and tube heat exchangers, plate heat exchangers, etc.) to heat the cold medium, and the water pump pressurizes to overcome the system resistance to complete the heat exchange. circulatory system. This kind of system has accumulated ...

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Problems solved by technology

This kind of system has accumulated rich experience through long-term use and is relatively mature, but there are also some shortcomings: the problem of full utilization of steam heat energy, steam releases latent heat in the heat exchanger to heat cold water, and then phase changes into condensed water. Different working pressures of steam contain different degrees of waste heat, and its relative value can even be as high as nearly 30% of steam energy

[0007] Since each heat exchanger of the jet heat pump can be configured separately and the whole system does not need an outer casing, the whole system can adapt to the requirements of large load and high flow rate, while the heat supply of a single lithium bromide refrigerator is limited by its casing. The maximum is 30MW, which leads to the problem of too many units in the overall system and a large footprint, resulting in high cost

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