CN-121993830-A - Combined heat supply system of high-temperature heat pump coupling back pressure unit

CN121993830ACN 121993830 ACN121993830 ACN 121993830ACN-121993830-A

Abstract

The invention relates to a high-temperature heat pump coupling back pressure unit combined heat supply system which comprises a back press, a heat storage medium circulation loop, a high-temperature medium circulation loop, a low-temperature medium circulation loop and a low-temperature deoxygenated water heat exchange main path, wherein the low-temperature deoxygenated water heat exchange main path is connected with the low-temperature medium circulation loop through a low-temperature heat exchanger so that exhaust steam of the back press exchanges heat with a low-temperature medium, the high-temperature medium circulation loop is connected with the low-temperature medium circulation loop through a back heat exchanger so that the high-temperature medium exchanges heat with the low-temperature medium, the heat storage medium circulation loop is connected with the high-temperature medium circulation loop through the high-temperature heat exchanger so that the high-temperature medium exchanges heat with the heat storage medium, and the heat storage medium circulation loop is connected with the low-temperature deoxygenated water heat exchange main path through the heat exchanger group so that the low-temperature deoxygenated water exchanges heat with the heat storage medium. Therefore, the novel energy green electricity can be eliminated, the green carbon reduction of the unit is realized, the self-produced coal electricity can be eliminated, and the thermal decoupling of the unit is realized.

Inventors

CUI FUDONG
LI PU
LIU JUNQING
WANG LEI
ZHANG LONGNIAN
WANG HONGGANG
LI LEI
YU DONG
ZHANG HONGWEI

Assignees

北京低碳清洁能源研究院
国能榆林能源有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A high-temperature heat pump coupling back pressure unit combined heat supply system is characterized by comprising a back pressure machine and a high-temperature heat pump system, wherein the high-temperature heat pump system comprises a heat storage medium circulation loop, a high-temperature medium circulation loop, a low-temperature medium circulation loop and a low-temperature deoxygenated water heat exchange main path, the low-temperature deoxygenated water heat exchange main path is connected with the low-temperature medium circulation loop through a low-temperature heat exchanger so that exhaust steam of the back pressure machine exchanges heat with the low-temperature medium, the high-temperature medium circulation loop is connected with the low-temperature medium circulation loop through a back heat exchanger so that the high-temperature medium exchanges heat with the low-temperature medium, the heat storage medium circulation loop is connected with the high-temperature medium circulation loop through the high-temperature heat exchanger so that the high-temperature medium exchanges heat with the heat storage medium, the heat storage medium circulation loop is connected with the low-temperature deoxygenated water heat exchange main path through the heat exchanger so that the low-temperature deoxygenated water exchanges heat with the medium, The back pressure machine is arranged on the deoxygenated water heat exchange branch, the back pressure machine and the high-temperature medium circulation loop are used for heating a low-temperature medium, the high-temperature medium circulation loop is used for heating a heat storage medium, the heat storage medium circulation loop is used for heating deoxygenated water in the deoxygenated water heat exchange branch, and the heated deoxygenated water is used for supplying heat to the outside.
2. The high-temperature heat pump coupling back pressure unit combined heat supply system according to claim 1, wherein the high-temperature medium circulation loop comprises a regenerative heat exchanger, a high-temperature heat exchanger and a compressor which are sequentially connected, the low-temperature medium circulation loop comprises the low-temperature heat exchanger, the regenerative heat exchanger and an expander which are sequentially connected, and the output end of the expander is connected to the compressor, wherein the expander is used for reducing temperature and pressure of a low-temperature medium, and the compressor is used for heating and boosting temperature and pressure of the high-temperature medium.
3. The high-temperature heat pump coupled back pressure unit combined heat supply system according to claim 1 or 2, wherein the heat storage medium circulation loop comprises a low-temperature heat storage tank, the high-temperature heat exchanger, a high-temperature heat storage tank and the heat exchanger group which are sequentially connected.
4. The high-temperature heat pump coupled back pressure unit combined heat supply system according to claim 3, wherein the low-temperature deoxygenated water heat exchange main path comprises a back press, a low-temperature heat exchanger, a low-pressure deoxygenator, a second water supply pump, the heat exchanger group and a steam supply pipe which are sequentially connected, and the back press is communicated with the steam supply pipe.
5. The high temperature heat pump coupled back pressure unit combination heating system of claim 4, wherein the heat exchanger unit comprises a superheater, an evaporator, and a preheater.
6. The high temperature heat pump coupled back pressure unit combined heat supply system according to claim 5, wherein in the heat storage medium circulation circuit, the superheater is arranged adjacently downstream of the high temperature heat storage tank, and the preheater is arranged adjacently upstream of the low temperature heat storage tank.
7. The high temperature heat pump coupled back pressure unit combined heat supply system according to claim 5, wherein in the low temperature deoxygenated water heat exchange main circuit, the preheater is arranged adjacent downstream of the low pressure deoxygenator, and the superheater is arranged adjacent upstream of the steam supply pipe.
8. The high-temperature heat pump coupling back pressure unit combined heat supply system according to claim 2, further comprising a power supply branch, wherein the power supply branch comprises the turbo generator, the transformer, the isolating switch, the frequency conversion device, the driving motor and the expander which are connected in sequence.
9. The high temperature heat pump coupled back pressure unit combined heat supply system according to claim 1, wherein the low pressure deaerator is further connected with a first water feed pump.
10. The high-temperature heat pump coupling back pressure unit combined heat supply system according to claim 1, wherein in the low-temperature deoxygenated water heat exchange main path, two heat supply branches arranged in parallel are arranged between the heat exchanger unit and the steam supply pipe, the steam supply pipe comprises a low-pressure steam supply pipe and a high-pressure steam supply pipe, and the low-pressure steam supply pipe and the high-pressure steam supply pipe are respectively arranged on the two heat supply branches.

Description

Combined heat supply system of high-temperature heat pump coupling back pressure unit Technical Field The disclosure relates to the technical field of turbine power generation, in particular to a high-temperature heat pump coupling back pressure unit combined heat supply system. Background Compared with the relatively flexible operation of a condensing unit, the steam extraction back pressure type unit is difficult to realize thermal decoupling due to stable pressure limitation of steam parameters of industrial users, the daytime steam supply demand of some industrial parks is far higher than the night demand, so that the heat load pressure of the back pressure unit on the daytime top is high, the low heat load at night causes difficult operation and even stop of the unit, the low load causes rapid increase of coal consumption, and frequent heat load peak regulation on the day and night causes frequent start and stop of the back pressure unit, thereby influencing the service life of the unit. Disclosure of Invention It is an object of the present disclosure to provide a high temperature heat pump coupled back pressure unit combined heat supply system to at least partially solve the problems in the related art. In order to achieve the aim, the disclosure provides a high-temperature heat pump coupling back pressure unit combined heat supply system, which comprises a back pressure machine and a high-temperature heat pump system, wherein the high-temperature heat pump system comprises a heat storage medium circulation loop, a high-temperature medium circulation loop, a low-temperature medium circulation loop and a low-temperature deoxygenated water heat exchange main path, wherein the low-temperature deoxygenated water heat exchange main path is connected with the low-temperature medium circulation loop through a low-temperature heat exchanger so as to enable exhaust steam of the back pressure machine to exchange heat with low-temperature medium, the high-temperature medium circulation loop is connected with the low-temperature medium circulation loop through a back heat exchanger so as to enable the high-temperature medium to exchange heat with the low-temperature medium, the heat storage medium circulation loop is connected with the high-temperature medium circulation loop through the high-temperature heat exchanger so as to enable the low-temperature water to exchange heat with the medium through the heat storage heat exchanger group, The back pressure machine is arranged on the deoxygenated water heat exchange branch, the back pressure machine and the high-temperature medium circulation loop are used for heating a low-temperature medium, the high-temperature medium circulation loop is used for heating a heat storage medium, the heat storage medium circulation loop is used for heating deoxygenated water in the deoxygenated water heat exchange branch, and the heated deoxygenated water is used for supplying heat to the outside. Optionally, the high temperature medium circulation loop includes the backheating heat exchanger that connects gradually high temperature heat exchanger and compressor, the low temperature medium circulation loop includes the low temperature heat exchanger that connects gradually backheating heat exchanger and expander, the output of expander is connected to the compressor, wherein, the expander is used for cooling down the low temperature medium and steps down, the compressor is used for high temperature medium intensification and steps up. Optionally, the heat storage medium circulation loop comprises a low-temperature heat storage tank, the high-temperature heat exchanger, the high-temperature heat storage tank and the heat exchanger group which are sequentially connected. Optionally, the low temperature deoxidization water heat transfer main way includes the back press that connects gradually low temperature heat exchanger, low pressure deoxidizer, second feed pump, heat exchanger group and steam supply pipe, the back press with steam supply pipe intercommunication. Optionally, the heat exchanger group includes a superheater, an evaporator, and a preheater. Optionally, in the heat storage medium circulation circuit, the superheater is disposed adjacent downstream of the high temperature heat storage tank, and the preheater is disposed adjacent upstream of the low temperature heat storage tank. Optionally, in the low-temperature deoxygenated water heat exchange main path, the preheater is arranged adjacent downstream of the low-pressure deoxygenator, and the superheater is arranged adjacent upstream of the steam supply pipe. Optionally, the high-temperature heat pump coupling back pressure unit combined heat supply system further comprises a power supply branch, wherein the power supply branch comprises the steam turbine generator, the transformer, the isolating switch, the frequency conversion device, the driving motor and the expander which are connected in sequence. Optionally, th