CN113566185A

CN113566185A - Diversified heat supply system for peak shaving of cogeneration system and economic regulation method

Info

Publication number: CN113566185A
Application number: CN202110834966.5A
Authority: CN
Inventors: 尹国安; 王永贞; 朱登元; 于本福; 寇学森
Original assignee: Linyi University
Current assignee: Linyi University
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-10-29

Abstract

The invention discloses a diversified heat supply system for peak shaving of a cogeneration system and an economic regulation method, which mainly comprise the following steps: the steam turbine, the condenser, the steam pressure adapter, the industrial steam user, the backpressure machine, the generator, the steam type electrode boiler, the steam-water mixed heating device, the circulating water pump, the steam-water heat exchanger, the water-water heat exchanger, the hot water heat storage device, the heating user and the power grid are flexibly adjusted by utilizing steam extraction parameters to match with the power peak regulation of the unit, the capacity cascade utilization is realized by recovering the steam complementary energy based on the backpressure machine, the unit supplies steam to the industrial steam user, supplies heat to the heating user, and balances the difference of electric heating load on time and space by utilizing the hot water heat storage device. According to the invention, through the high-efficiency integration of cogeneration steam supply and heating, the diversified and multi-grade heat demand of users is met, the high-efficiency utilization of energy cascade is realized, the deep power peak regulation of the cogeneration system is realized through the flexible adjustment of steam extraction parameters and the coupling heat storage device, and the market application prospect is wide.

Description

Diversified heat supply system for peak shaving of cogeneration system and economic regulation method

Technical Field

The invention belongs to the technical field of cogeneration, and particularly relates to a diversified heating system for peak shaving of a cogeneration system and an economic regulation method, which are particularly suitable for the cogeneration peak shaving system with steam supply and heating requirements.

Background

At present, in order to improve the comprehensive energy utilization efficiency of the thermal power generating unit and strive for more electricity generation utilization hours, the pure condensing unit is widely developed to supply heat. However, for different industrial steam users, the required steam pressure parameters are different due to different processes, and for the thermoelectric power unit, only one main pipeline for supplying steam to the outside is provided, namely, only steam with one pressure parameter can be supplied to the outside. Therefore, mismatching of steam supply parameters of the thermoelectric generating set and steam users is caused, the steam consumption requirements of the steam users cannot be guaranteed, and energy loss is caused to a certain extent. Particularly, the requirement of the rapid development of new energy power on the peak regulation capacity of the thermal power generating unit is stricter and stricter, but the peak regulation capacity of the thermal power generating unit is seriously low because the cogeneration unit cannot be flexibly regulated for ensuring heat supply, and the requirement of national energy transformation at the present stage cannot be met.

In addition, in recent years, as the industrial park advances energy conservation and emission reduction and rapid development of centralized heating, a high-pollution and low-energy-efficiency heating boiler of the original industrial park is gradually shut down and replaces the high-pollution and low-energy-efficiency heating boiler with a cogeneration centralized heating mode, however, energy requirements for steam users and heating users are different, generally speaking, a hot water pipe network is laid for the heating users, and a steam pipe network is laid for the steam users, so that the investment of pipe network construction is very large.

In conclusion, the technical problems in the market are mainly solved by the following technical means: the Chinese patent 'high-low pressure two-stage industrial steam extraction and heat supply device of a steam turbine' with the application number of 201310667813.1 can meet the requirements of high-low pressure two-stage steam of a heat user by a certain technical means, but has the defect that two steam main pipelines need to be laid, thereby greatly increasing the investment cost; in particular, the same problem is encountered with each increase in the demand for a vapor pressure parameter. Aiming at the technical problems, the invention integrates the heat and power cogeneration steam supply flow and the heating flow with high efficiency, the steam pipe network is used for heating users, and various steam extraction integration modes are utilized to meet the peak regulation requirement of the cogeneration unit, and the steam type electrode boiler and the heat storage device are utilized to meet the peak regulation requirements of the cogeneration unit and the power grid, meanwhile, in the aspect of energy saving, the surplus energy at the steam user side is recycled to meet the power demand of the electric equipment and the heating demand of the heating user, therefore, the investment cost of the cogeneration centralized heating system is reduced, the power peak regulation capacity of the cogeneration system is improved, diversified and multi-grade heating requirements are met, the energy is recycled in a gradient manner by recycling the residual energy, the policy development requirement of national energy transformation is met, and the market application prospect is wide.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a diversified heating system which is reasonable in design, reliable in performance and used for peak shaving of a cogeneration system and an economic regulation method.

The technical scheme adopted by the invention for solving the problems is as follows: a diversified heating system for peak shaving of a cogeneration system, comprising: the high-medium pressure steam turbine cylinder is connected with a high-pressure steam inlet of the steam turbine low-medium pressure cylinder, a first valve is arranged at the high-pressure steam inlet of the steam pressure matcher, and a second valve is arranged at the high-pressure steam inlet of the steam turbine high-medium pressure cylinder, the low-pressure steam extraction port of the steam turbine low-pressure cylinder is connected with the low-pressure steam inlet of the steam pressure matcher, a third valve is installed at the low-pressure steam extraction port of the steam turbine low-pressure cylinder, a fourth valve is installed at the low-pressure steam inlet of the steam pressure matcher, a medium-pressure steam outlet of the steam pressure matcher is connected with the steam inlet of an industrial steam conveying pipe, a fifth valve is installed at the medium-pressure steam outlet of the steam pressure matcher, the steam inlet of the industrial steam conveying pipe is further connected with the high-pressure steam extraction port of the steam turbine high-medium pressure cylinder and the low-pressure steam extraction port of the steam turbine low-pressure cylinder through a first steam extraction branch pipe and a second steam extraction branch pipe respectively, a sixth valve is installed on the first steam extraction branch pipe, a seventh valve is installed on the second steam extraction branch pipe, and the steam outlet of the industrial steam conveying pipe is connected with the steam inlet of the first back pressure machine and the steam inlet of the second back pressure machine respectively through the first industrial steam extraction branch pipe and the second industrial steam extraction branch pipe, a ninth valve is arranged on the first industrial steam branch pipe, a tenth valve is arranged at a steam inlet of the first back pressure machine, a seventeenth valve is arranged on the second industrial steam branch pipe, an eighteenth valve is arranged at a steam inlet of the second back pressure machine, a steam outlet of the first back pressure machine is connected with a steam inlet of an industrial steam user, an eleventh valve is arranged at a steam outlet of the first back pressure machine, the first back pressure machine drives the first generator to do work to generate power, the power generated by the first generator is transmitted to the first steam type electrode boiler to generate steam, a steam outlet of the first steam type electrode boiler is respectively connected with the steam inlet of the industrial steam user and the steam inlet of the steam-water mixed heating device through the first steam branch pipe and the second steam branch pipe, a fourteenth valve is arranged on the first steam branch pipe, and a fifteenth valve is arranged on the second steam branch pipe, the steam outlet of the second back press is connected with the steam inlet of the steam-water heat exchanger, a nineteenth valve is installed at the steam outlet of the second back press, the second back press drives the second generator to do work and generate power, the drain outlet of the steam-water heat exchanger is connected with the drain inlet of the water-water heat exchanger, a twenty-first valve is installed at the drain outlet of the steam-water heat exchanger, a twenty-twelfth valve is installed at the drain inlet of the water-water heat exchanger, the drain inlet of the water-water heat exchanger is also connected with the drain outlet of an industrial steam user and the high-temperature water outlet of the steam-water mixed heating device through a first drain conveying pipe, a thirteenth valve is installed at the drain outlet of the industrial steam user, a sixteenth valve is installed at the high-temperature water outlet of the steam-water mixed heating device, and the drain outlet of the water-water heat exchanger is connected with the drain inlet of the condenser through a second drain conveying pipe, a thirteenth valve is arranged at a drain outlet of the water-water heat exchanger, a drain circulating pump is arranged on a second drain conveying pipe, an eighth valve is arranged at a drain inlet of the condenser, a heat supply network water outlet of a heating user is connected with a heat supply network water inlet of the water-water heat exchanger through a heat supply network water return pipe, the heat supply network water return pipe is provided with the heat supply network water circulating pump, a twenty-sixth valve is arranged at a heat supply network water inlet of the water-water heat exchanger, a heat supply network water outlet of the water-water heat exchanger is connected with a water inlet of the steam-water heat exchanger, a twenty-seventh valve is arranged at the heat supply network water outlet of the water-water heat exchanger, a twenty-ninth valve is arranged at a water inlet of the steam-water heat exchanger, a water outlet of the steam-water heat exchanger is connected with the heat supply network water inlet of the heating user through a heat supply network water supply pipe, a thirtieth valve is arranged at a water outlet of the steam-water heat exchanger, and a thirty valve is arranged on the heat supply network, the heat storage end of the hot water heat storage device is respectively connected with a heat supply network water inlet of the water-water heat exchanger and a water outlet of the steam-water heat exchanger through a first heat storage pipe and a second heat storage pipe, a thirty-two valve and a heat storage circulating pump are installed on the first heat storage pipe, a thirty-three valve is installed on the second heat storage pipe, the heat release end of the hot water heat storage device is respectively connected with a water outlet of the heat supply network water circulating pump and a water inlet end of a heat supply network water supply pipe through a first heat release pipe and a second heat release pipe, a thirty-four valve is installed on the first heat release pipe, a thirty-five valve and a heat release circulating pump are installed on the second heat release pipe, the power grid provides power for the second steam type electrode boiler, the steam outlet of the second steam type electrode boiler is respectively connected with a steam inlet of the second back press and a steam inlet of the first back press through a third steam branch pipe and a fourth steam branch pipe, and a thirty-sixth valve is installed at a steam outlet of the second steam type electrode boiler, a thirty-seventh valve is installed on the third steam branch pipe, and a thirty-eighth valve is installed on the fourth steam branch pipe.

Furthermore, a first steam bypass is arranged between the steam inlet and the steam outlet of the first back press, a twelfth valve is installed on the first steam bypass, a second steam bypass is arranged between the steam inlet and the steam outlet of the second back press, and a twentieth valve is installed on the second steam bypass.

Further, the steam-water mixed heating device is a direct contact heat exchanger, and steam from the first steam type electrode boiler and externally supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device.

Furthermore, the hydrophobic side of the water-water heat exchanger is provided with a first hydrophobic bypass, a twenty-fourth valve is installed on the first hydrophobic bypass, the heat supply network water side of the water-water heat exchanger is provided with a heat supply network water bypass, and a twenty-eighth valve is installed on the heat supply network water bypass.

Furthermore, a second hydrophobic bypass is arranged between a water outlet of the hydrophobic circulating pump and the heat supply network water return pipe, and a twenty-fifth valve is installed on the second hydrophobic bypass.

Furthermore, the electric power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a heat supply network water circulating pump, a heat storage circulating pump and a heat release circulating pump to do work, and the electric power generated by the first generator is also used for driving power equipment of an industrial steam user to do work.

The economic regulation method of the diversified heat supply system for peak shaving of the cogeneration system is characterized by comprising the following steps of:

when the cogeneration unit needs to operate at a high electrical load rate:

only opening and adjusting the third valve and the seventh valve, and supplying low-pressure steam generated by the low-pressure cylinder of the steam turbine to the outside through the second steam extraction branch pipe and the industrial steam conveying pipe in sequence;

at the moment, closing a tenth valve, an eleventh valve, a fourteenth valve, a fifteenth valve and a sixteenth valve, opening and adjusting a ninth valve, a twelfth valve and a thirteenth valve, directly supplying low-pressure steam from an industrial steam delivery pipe to industrial steam users for use, and externally supplying steam drainage generated by the industrial steam users through a first drainage delivery pipe;

at the moment, an eighteenth valve, a nineteenth valve, a twenty-fourth valve, a twenty-fifth valve and a twenty-eighth valve are closed, the eighth valve, a seventeenth valve, a twentieth valve, a twenty-first valve, a twenty-twelfth valve and a twenty-thirteenth valve are opened and adjusted, low-pressure steam from an industrial steam conveying pipe directly enters a steam-water heat exchanger to heat mains water, steam drain water from an industrial steam user enters a water-water heat exchanger to heat mains water through the steam-water heat exchanger simultaneously to heat the mains water, the drain water cooled by the water-water heat exchanger is returned to a condenser through a second drain conveying pipe under the driving of a drain circulating pump, a twenty-sixth valve, a twenty-seventh valve, a twenty-ninth valve, a thirty-fourth valve and a thirty-sixth valve are opened and adjusted simultaneously, mains return water from a heating user is conveyed to the water-water heat exchanger through a mains return pipe under the driving of the mains water circulating pump to be heated in one stage, then the water enters a steam-water heat exchanger to be heated by two stages, high-temperature heat supply network water is formed to heat users through a heat supply network water supply pipe, and electric power required by power equipment such as a drainage circulating pump, a heat supply network water circulating pump, a heat storage circulating pump, a heat release circulating pump and the like to do work is provided by a power grid.

When the cogeneration unit needs to operate at a low electrical load rate:

firstly, opening and adjusting a first valve, a second valve, a third valve, a fourth valve and a fifth valve, closing a sixth valve and a seventh valve, feeding high-pressure steam generated by a high-medium pressure cylinder of a steam turbine and low-pressure steam generated by a low-pressure cylinder of the steam turbine into a steam pressure matcher to mix, and then feeding out formed medium-pressure steam through an industrial steam conveying pipe;

at the moment, the twelfth valve is closed, the ninth valve, the tenth valve, the eleventh valve and the thirteenth valve are opened and adjusted, medium-pressure steam from the industrial steam conveying pipe firstly enters the first back pressure machine to drive the first generator to do work and generate power and then is reduced in pressure, then formed low-pressure steam is supplied to industrial steam users for use, electric power generated by the first generator is used for the first steam type electrode boiler to produce the low-pressure steam, and steam drainage generated by the industrial steam users is supplied to the outside through the first drainage conveying pipe;

at the moment, a twenty-fourth valve, a twenty-fifth valve and a twenty-eighth valve are closed, medium-pressure steam from an industrial steam conveying pipe is opened and adjusted, one part of the medium-pressure steam enters a second back pressure machine to drive a second generator to do work and generate power and then enters a steam-water heat exchanger to heat supply network water, the other part of the medium-pressure steam directly enters the steam-water heat exchanger to heat the heat supply network water, electric power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a heat supply network water circulating pump, a heat storage circulating pump and a heat release circulating pump to do work, steam drainage water from industrial steam users enters a water-water heat exchanger to heat the heat supply network water through a first drainage conveying pipe and steam drainage water formed by the steam-water heat exchanger, the drainage water cooled by the water-water heat exchanger returns to a condenser through a second drainage conveying pipe under the driving of the drainage circulating pump, the twenty-sixth valve, the twenty-seventh valve, the twenty-ninth valve, the thirty-fifth valve and the thirty-sixth valve are opened and adjusted at the same time, return water of a heating network from a heating user is driven by a water circulating pump of the heating network and is conveyed to the water-water heat exchanger through a water return pipe of the heating network to be heated by a first stage, then enters the steam-water heat exchanger to be heated by a second stage, and high-temperature water of the heating network is conveyed to the heating user through a water supply pipe of the heating network to be heated;

secondly, closing the second valve, the third valve, the fourth valve, the fifth valve and the seventh valve, opening and adjusting the first valve and the sixth valve, and supplying high-pressure steam generated by the high and medium pressure cylinder of the steam turbine to the outside through the first steam extraction branch pipe and the industrial steam conveying pipe in sequence;

at the moment, the twelfth valve is closed, the ninth valve, the tenth valve, the eleventh valve and the thirteenth valve are opened and adjusted, high-pressure steam from the industrial steam conveying pipe firstly enters the first back pressure machine to drive the first generator to do work and generate power and then is reduced in pressure, then formed low-pressure steam is supplied to industrial steam users for use, electric power generated by the first generator is used for the first steam type electrode boiler to produce the low-pressure steam, and steam drainage generated by the industrial steam users is supplied to the outside through the first drainage conveying pipe;

at the moment, a twenty-fourth valve, a twenty-fifth valve and a twenty-eighth valve are closed, the eighth valve, a seventeenth valve, an eighteenth valve, a nineteenth valve, a twentieth valve, a twenty-first valve, a twenty-twelfth valve and a twenty-third valve are opened and adjusted, high-pressure steam from an industrial steam delivery pipe enters a second back pressure machine to drive a second generator to do work and generate power and then enters a steam-water heat exchanger to heat network water, the other part of the high-pressure steam directly enters the steam-water heat exchanger to heat the heat network water, power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a heat network water circulating pump, a heat storage circulating pump, a heat release circulating pump and the like to do work, steam drainage from industrial steam users enters a water-water heat exchanger to heat the heat network water through the first drainage delivery pipe and steam drainage formed by the steam-water heat exchanger, the drainage cooled by the water-water heat exchanger returns to the condenser through the second drainage delivery pipe under the driving of the water drainage circulating pump, and meanwhile, a twenty-sixth valve, a twenty-seventh valve, a twenty-ninth valve, a thirty-fifth valve and a thirty-sixth valve are opened and adjusted, return water of a heat supply network from a heating user is driven by a heat supply network water circulating pump to be conveyed to a water-water heat exchanger through a heat supply network water return pipe to be heated by a first stage, then enters a steam-water heat exchanger to be heated by a second stage, and forms high-temperature heat supply network water which is conveyed to the heating user through a heat supply network water supply pipe to be heated.

When the power grid needs to increase the power load to absorb the redundant power of the power grid:

opening and increasing the opening degrees of a thirty-sixth valve and a thirty-seventh valve, and increasing the opening degrees of an eighteenth valve and a nineteenth valve, wherein the second steam type electrode boiler utilizes the power provided by the power grid to produce steam, and the steam is conveyed to the second back pressure machine through a third steam branch pipe to do work and then enters the steam-water heat exchanger, so that the steam flow entering the steam-water heat exchanger is increased;

at the moment, the thirty-second valve and the thirty-third valve are opened and adjusted, the thirty-fourth valve and the thirty-fifth valve are closed, and the hot water heat storage device stores heat to absorb the heat supplied by the steam-water heat exchanger and the water-water heat exchanger, so that the heating requirement of a heating user is met.

When the power grid needs to reduce the power load to make up for the insufficient power of the power grid:

reducing the opening degrees of a thirty-sixth valve and a thirty-seventh valve until the valves are closed, reducing the opening degrees of an eighteenth valve and a nineteenth valve, reducing the power provided by a power grid to the second steam type electrode boiler until the power is zero, and reducing the steam flow transmitted to the second back press and the steam-water heat exchanger by the second steam type electrode boiler until the steam flow is zero;

at the moment, the thirty-fourth valve and the thirty-fifth valve are opened and adjusted, the thirty-second valve and the thirty-third valve are closed, and the hot water heat storage device releases heat to the outside to supplement the heat which is less supplied by the steam-water heat exchanger and the water-water heat exchanger, so that the heating requirement of a heating user is ensured.

Furthermore, when the price of the unit steam heat provided by the first steam type electrode boiler to the water-water heat exchanger is larger than the price of the unit steam heat provided by the industrial steam delivery pipe to the industrial steam user, the fourteenth valve is closed, the fifteenth valve and the sixteenth valve are opened, the steam from the first steam type electrode boiler and the externally-supplied feed water are mixed and exchanged heat in the steam-water mixed heating device to form hot water, and then the hot water is supplied to the water-water heat exchanger through the first drainage delivery pipe to supply heat for the heating user.

Furthermore, when the price of the unit steam heat provided by the first steam type electrode boiler to the water-water heat exchanger is less than the price of the unit steam heat provided by the industrial steam conveying pipe to the industrial steam user, the fifteenth valve and the sixteenth valve are closed, the fourteenth valve is opened, and the steam from the first steam type electrode boiler is directly provided to the industrial steam user for use.

Further, when the unit steam price provided by the industrial steam conveying pipe is larger than that provided by the second steam type electrode boiler, the opening degrees of the ninth valve and the seventeenth valve are reduced until the ninth valve and the seventeenth valve are closed, the thirty sixth valve, the thirty seventh valve and the thirty eighth valve are opened and adjusted, the steam flow rate supplied to the industrial steam user and the steam-water heat exchanger by the second steam type electrode boiler is increased, and the steam flow rate supplied to the industrial steam user and the steam-water heat exchanger by the industrial steam conveying pipe is reduced until the steam flow rate is zero.

Further, when the unit steam price provided by the industrial steam conveying pipe is less than that provided by the second steam type electrode boiler, the opening degrees of the thirty-sixth valve, the thirty-seventh valve and the thirty-eighth valve are reduced until the valves are closed, the ninth valve and the seventeenth valve are opened and adjusted, the steam flow rate of the industrial steam conveying pipe for supplying industrial steam users and the steam-water heat exchanger is increased, and the steam flow rate of the second steam type electrode boiler for supplying industrial steam users and the steam-water heat exchanger is reduced until the steam flow rate is zero.

Further, when the cogeneration unit needs to change the electric load factor to operate, if the steam flow externally supplied by the high and medium pressure cylinder and the low pressure cylinder of the steam turbine needs to be increased, all the steam which is supplied in more than one way is conveyed to the second back pressure machine and the steam-water heat exchanger to be used for heating heat supply network water, at the moment, the thirty-twelfth valve and the thirty-fifth valve are opened and adjusted, the thirty-fourth valve and the thirty-fifth valve are closed, and the hot water heat storage device stores heat to absorb the heat which is supplied in more than one way by the steam-water heat exchanger and the water-water heat exchanger, so that the heating requirement of a heating user is ensured; if the steam flow supplied to the outside by the high and medium pressure cylinders and the low pressure cylinder of the steam turbine needs to be reduced, the steam flow supplied to the second back pressure machine and the steam-water heat exchanger is reduced, at the moment, the thirty-fourth valve and the thirty-fifth valve are opened and adjusted, the thirty-twelfth valve and the thirty-thirteenth valve are closed, and the hot water heat storage device releases heat to the outside to supplement the heat which is less supplied by the steam-water heat exchanger and the water-water heat exchanger, so that the heating requirement of a heating user is ensured.

Further, when the return water pressure of a heating network from a heating user is low, a twenty-fifth valve is opened, an eighth valve is closed, drain water from the water-water heat exchanger is driven by the drain water circulating pump to be conveyed to a return water pipe of the heating network through a second drain bypass, and water supplementing and pressure stabilizing are carried out on the heating system of the heating user.

Further, when the power consumption of power equipment such as drainage circulating pump, heat supply network water circulating pump, heat accumulation circulating pump and exothermic circulating pump changes, then adjust the aperture of eighteenth valve, nineteenth valve and twentieth valve, change the steam flow that gets into the second backpressure machine to the generated energy of second generator is changed, the power consumption of power equipment such as drainage circulating pump, heat supply network water circulating pump, heat accumulation circulating pump and exothermic circulating pump is matchd.

Compared with the prior art, the invention has the following advantages and effects: (1) the invention integrates the cogeneration steam supply flow and the heating flow with high efficiency by technical means, and utilizes the steam pipe network to supply steam for steam users and heat for heating users at the same time, thereby not only reducing the pipe network construction investment of a centralized heating system, but also meeting the diversified and multi-grade heat demand of the user side; (2) the coupling of diversified energy requirements of heating users and steam users is utilized, and the steam extraction parameters of the cogeneration unit are flexibly adjusted, so that the power peak regulation capacity of the cogeneration system is effectively improved, the energy is recycled in a gradient manner by recycling the complementary energy, the policy development requirement of national energy transformation is met, and the solar energy combined heat and power generation system has a wide market application prospect.

Drawings

Fig. 1 is a system schematic diagram of a diversified heating system for peak shaving of a cogeneration system in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a system for supplying steam using only a low pressure cylinder of a steam turbine according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a system for supplying steam using both a high and medium pressure turbine cylinder and a low pressure turbine cylinder according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a system for supplying steam using only high and medium pressure steam turbines according to an embodiment of the present invention.

In the figure: 1-a steam turbine high and medium pressure cylinder, 2-a steam turbine low pressure cylinder, 3-a condenser, 4-a steam pressure matcher, 5-an industrial steam user, 6-a first back press, 7-a first generator, 8-a first steam type electrode boiler, 9-a steam-water mixed heating device, 10-a heating user, 11-a second back press, 12-a second generator, 13-a steam-water heat exchanger, 14-a water-water heat exchanger, 15-a hydrophobic circulating pump, 16-a heat supply network water circulating pump, 17-a hot water heat storage device, 18-a heat storage circulating pump, 19-a heat release circulating pump, 20-a power grid, 21-a second steam type electrode boiler, 31-a first valve, 32-a second valve, 33-a third valve, 34-a fourth valve, 35-fifth valve, 36-sixth valve, 37-seventh valve, 38-eighth valve, 39-ninth valve, 40-tenth valve, 41-eleventh valve, 42-twelfth valve, 43-thirteenth valve, 44-fourteenth valve, 45-fifteenth valve, 46-sixteenth valve, 47-seventeenth valve, 48-eighteenth valve, 49-nineteenth valve, 50-twentieth valve, 51-twenty-first valve, 52-twenty-second valve, 53-twenty-third valve, 54-twenty-fourth valve, 55-twenty-fifth valve, 56-twenty-sixth valve, 57-twenty-seventh valve, 58-twenty-eighth valve, 59-twenty-ninth valve, 60-thirty-third valve, 61-thirty-first valve, 62-thirty-second valve, 63-thirty-third valve, 64-thirty-fourth valve, 65-thirty-fifth valve, 66-thirty-sixth valve, 67-thirty-seventh valve, 68-thirty-eighth valve, 71-first steam extraction branch pipe, 72-second steam extraction branch pipe, 73-industrial steam conveying pipe, 74-first industrial steam branch pipe, 75-second industrial steam branch pipe, 76-first steam bypass, 77-first steam branch pipe, 78-second steam branch pipe, 79-first drain conveying pipe, 80-second steam bypass, 81-first drain bypass, 82-second drain conveying pipe, 83-second drain bypass, 84-heat net water return pipe, 85-heat net water supply pipe, 86-a heat supply network water bypass, 87-a first heat storage pipe, 88-a second heat storage pipe, 89-a first heat release pipe, 90-a second heat release pipe, 91-a third steam branch pipe and 92-a fourth steam branch pipe.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Examples

Referring to fig. 1, in the present embodiment, a diversified heating system for peak shaving of a cogeneration system includes: the system comprises a steam turbine high and medium pressure cylinder 1, a steam turbine low and medium pressure cylinder 2, a condenser 3, a steam pressure matcher 4, an industrial steam user 5, a first back pressure machine 6, a first generator 7, a first steam type electrode boiler 8, a steam-water mixed heating device 9, a heating user 10, a second back pressure machine 11, a second generator 12, a steam-water heat exchanger 13, a water-water heat exchanger 14, a drain circulating pump 15, a heat supply network water circulating pump 16, a hot water heat storage device 17, a heat storage circulating pump 18, a heat release circulating pump 19, a power grid 20 and a second steam type electrode boiler 21, wherein a steam outlet of the steam turbine high and medium pressure cylinder 1 is connected with a steam inlet of the steam turbine low and medium pressure cylinder 2, a steam outlet of the steam turbine low and medium pressure cylinder 2 is connected with a steam inlet of the condenser 3, a high-pressure steam outlet of the steam turbine high and medium pressure cylinder matcher 1 is connected with a high-pressure steam inlet of the steam pressure 4, and a first valve 31 is installed at the high-pressure steam outlet of the steam turbine high and medium pressure cylinder 1, a second valve 32 is installed at a high-pressure steam inlet of the steam pressure matcher 4, a low-pressure steam extraction port of the steam turbine low-pressure cylinder 2 is connected with a low-pressure steam inlet of the steam pressure matcher 4, a third valve 33 is installed at a low-pressure steam extraction port of the steam turbine low-pressure cylinder 2, a fourth valve 34 is installed at a low-pressure steam inlet of the steam pressure matcher 4, a medium-pressure steam outlet of the steam pressure matcher 4 is connected with a steam inlet end of an industrial steam conveying pipe 73, a fifth valve 35 is installed at a medium-pressure steam outlet of the steam pressure matcher 4, a steam inlet end of the industrial steam conveying pipe 73 is further connected with the high-pressure steam extraction port of the steam turbine high-and medium-pressure cylinder 1 and the low-pressure steam extraction port of the steam turbine low-pressure cylinder 2 through a first steam extraction branch pipe 71 and a second steam extraction branch pipe 72 respectively, a sixth valve 36 is installed on the first steam extraction branch pipe 71, and a seventh valve 37 is installed on the second steam extraction branch pipe 72, the steam outlet end of the industrial steam delivery pipe 73 is respectively connected with the steam inlet of the first back press 6 and the steam inlet of the second back press 11 through a first industrial steam branch pipe 74 and a second industrial steam branch pipe 75, a ninth valve 39 is installed on the first industrial steam branch pipe 74, a tenth valve 40 is installed on the steam inlet of the first back press 6, a seventeenth valve 47 is installed on the second industrial steam branch pipe 75, an eighteenth valve 48 is installed on the steam inlet of the second back press 11, the steam outlet of the first back press 6 is connected with the steam inlet of the industrial steam user 5, an eleventh valve 41 is installed on the steam outlet of the first back press 6, the first back press 6 drives the first generator 7 to do work and generate power, the power generated by the first generator 7 is delivered to the first steam type electrode boiler 8 to generate steam, the steam outlet of the first steam type electrode boiler 8 is respectively connected with the steam inlet of the industrial steam user 5 and the mixed steam water inlet of the industrial steam user 5 and the steam outlet through a first steam branch pipe 77 and a second industrial steam branch pipe 78 A steam inlet of the combined heating device 9 is connected, a fourteenth valve 44 is installed on a first steam branch pipe 77, a fifteenth valve 45 is installed on a second steam branch pipe 78, a steam outlet of a second back press 11 is connected with a steam inlet of a steam-water heat exchanger 13, a nineteenth valve 49 is installed on a steam outlet of the second back press 11, the second back press 11 drives a second generator 12 to do work and generate power, a hydrophobic outlet of the steam-water heat exchanger 13 is connected with a hydrophobic inlet of a water-water heat exchanger 14, a twenty-first valve 51 is installed on a hydrophobic outlet of the steam-water heat exchanger 13, a twenty-second valve 52 is installed on a hydrophobic inlet of the water-water heat exchanger 14, the hydrophobic inlet of the water-water heat exchanger 14 is also connected with a hydrophobic outlet of an industrial steam user 5 and a high-temperature water outlet of the steam-water mixed heating device 9 through a first hydrophobic delivery pipe 79, and a thirteenth valve 43 is installed on a hydrophobic outlet of the industrial steam user 5, a sixteenth valve 46 is installed at a high-temperature water outlet of the steam-water mixed heating device 9, a drain outlet of the water-water heat exchanger 14 is connected with a drain inlet of the condenser 3 through a second drain delivery pipe 82, a twenty third valve 53 is installed at a drain outlet of the water-water heat exchanger 14, a drain circulating pump 15 is installed on the second drain delivery pipe 82, an eighth valve 38 is installed at a drain inlet of the condenser 3, a heat supply network water outlet of the heating user 10 is connected with a heat supply network water inlet of the water-water heat exchanger 14 through a heat supply network return pipe 84, a heat supply network water circulating pump 16 is installed on the heat supply network return pipe 84, a twenty sixth valve 56 is installed at the heat supply network water inlet of the water-water heat exchanger 14, a heat supply network water outlet of the water-water heat exchanger 14 is connected with a water inlet of the steam-water heat exchanger 13, a twenty seventh valve 57 is installed at the heat supply network water outlet of the water heat exchanger 14, a twenty ninth valve 59 is installed at a water inlet of the steam-water heat exchanger 13, a water outlet of the steam-water heat exchanger 13 is connected with a heat supply network water inlet of a heating user 10 through a heat supply network water supply pipe 85, a thirtieth valve 60 is installed at the water outlet of the steam-water heat exchanger 13, a thirty-first valve 61 is installed on the heat supply network water supply pipe 85, a heat storage end of the hot water heat storage device 17 is respectively connected with the heat supply network water inlet of the water-water heat exchanger 14 and the water outlet of the steam-water heat exchanger 13 through a first heat storage pipe 87 and a second heat storage pipe 88, a thirty-second valve 62 and a heat storage circulating pump 18 are installed on the first heat storage pipe 87, a thirty-third valve 63 is installed on the second heat storage pipe 88, a heat release end of the hot water heat storage device 17 is respectively connected with a water outlet of the heat supply network water circulating pump 16 and a water inlet end of the heat supply network water supply pipe 85 through a first heat release pipe 89 and a second heat release pipe 90, a thirty-fourth valve 64 is installed on the first heat release pipe 89, a thirty-fifth valve 65 and a heat release pump 19 are installed on the second heat release pipe 90, the power grid 20 provides power for the second steam type electrode boiler 21, a steam outlet of the second steam type electrode boiler 21 is respectively connected with a steam inlet of the second back pressure machine 11 and a steam inlet of the first back pressure machine 6 through a third steam branch pipe 91 and a fourth steam branch pipe 92, a thirty-sixth valve 66 is installed at the steam outlet of the second steam type electrode boiler 21, a thirty-seventh valve 67 is installed on the third steam branch pipe 91, and a thirty-eighth valve 68 is installed on the fourth steam branch pipe 92.

In this embodiment, a first steam bypass 76 is disposed between the steam inlet and the steam outlet of the first back press 6, a twelfth valve 42 is mounted on the first steam bypass 76, a second steam bypass 80 is disposed between the steam inlet and the steam outlet of the second back press 11, and a twentieth valve 50 is mounted on the second steam bypass 80.

In this embodiment, the steam-water mixing and heating device 9 is a direct contact heat exchanger, and the steam from the first steam type electrode boiler 8 and the externally supplied feed water perform mixed heat exchange in the steam-water mixing and heating device 9.

In this embodiment, the first drain bypass 81 is disposed on the drain side of the water-water heat exchanger 14, the twenty-fourth valve 54 is mounted on the first drain bypass 81, the network water bypass 86 is disposed on the network water side of the water-water heat exchanger 14, and the twenty-eighth valve 58 is mounted on the network water bypass 86.

In this embodiment, a second hydrophobic bypass 83 is provided between the water outlet of the hydrophobic circulating pump 15 and the heat supply network water return pipe 84, and a twenty-fifth valve 55 is installed on the second hydrophobic bypass 83.

In this embodiment, the electric power generated by the second generator 12 is used to drive power devices such as the drain circulating pump 15, the heat supply network water circulating pump 16, the heat storage circulating pump 18, and the heat release circulating pump 19 to do work, and the electric power generated by the first generator 7 is also used to drive the power devices of the industrial steam users 5 to do work.

In this embodiment, the economic adjustment method for the peak shaving diversified heating system of the cogeneration system is as follows:

when the cogeneration unit needs to operate at a high electrical load rate:

referring to fig. 2, only the third valve 33 and the seventh valve 37 are opened and adjusted, and the low-pressure steam generated by the steam turbine low-pressure cylinder 2 is sequentially supplied to the outside through the second steam extraction branch pipe 72 and the industrial steam delivery pipe 73;

at this time, the tenth valve 40, the eleventh valve 41, the fourteenth valve 44, the fifteenth valve 45 and the sixteenth valve 46 are closed, the ninth valve 39, the twelfth valve 42 and the thirteenth valve 43 are opened and adjusted, the low-pressure steam from the industrial steam delivery pipe 73 is directly supplied to the industrial steam user 5 for use, and the steam trap generated by the industrial steam user 5 is externally supplied through the first trap delivery pipe 79;

at this time, the eighteenth valve 48, the nineteenth valve 49, the twenty-fourth valve 54, the twenty-fifth valve 55 and the twenty-eighth valve 58 are closed, the eighth valve 38, the seventeenth valve 47, the twentieth valve 50, the twenty-first valve 51, the twentieth valve 52 and the twenty-third valve 53 are opened and adjusted, the low-pressure steam from the industrial steam delivery pipe 73 directly enters the steam-water heat exchanger 13 to heat the heat supply network water, the steam drain water from the industrial steam user 5 enters the water-water heat exchanger 14 to heat the heat supply network water through the first drain delivery pipe 79 and the steam drain water formed by the steam-water heat exchanger 13, the drain water after being cooled by the water-water heat exchanger 14 returns to the condenser 3 through the second drain delivery pipe 82 under the driving of the drain circulating pump 15, and the twenty-sixth valve 56, the twenty-seventh valve 57, the twenty-ninth valve 59, the thirty-third valve 60 and the thirty-eighth valve 61 are opened and adjusted, the return water from the heating user 10 is driven by the heat supply network water circulating pump 16 to be conveyed to the water-water heat exchanger 14 through the heat supply network return water pipe 84 to be heated by the first stage, then enters the steam-water heat exchanger 13 to be heated by the second stage, and then the formed high-temperature heat supply network water is conveyed to the heating user 10 through the heat supply network water supply pipe 85 to be heated, and the electric power required by the power equipment for working such as the drainage circulating pump 15, the heat supply network water circulating pump 16, the heat storage circulating pump 18 and the heat release circulating pump 19 is provided by the power network 20.

When the cogeneration unit needs to operate at a low electrical load rate:

first, referring to fig. 3, the first valve 31, the second valve 32, the third valve 33, the fourth valve 34 and the fifth valve 35 are opened and adjusted, the sixth valve 36 and the seventh valve 37 are closed, high-pressure steam generated by the turbine high and intermediate pressure cylinder 1 and low-pressure steam generated by the turbine low pressure cylinder 2 enter the steam pressure matcher 4 to be mixed, and then formed intermediate-pressure steam is supplied to the outside through the industrial steam delivery pipe 73;

at this time, the twelfth valve 42 is closed, the ninth valve 39, the tenth valve 40, the eleventh valve 41 and the thirteenth valve 43 are opened and adjusted, medium-pressure steam from the industrial steam delivery pipe 73 firstly enters the first back pressure machine 6 to drive the first generator 7 to do work and generate power, then the pressure is reduced, the formed low-pressure steam is supplied to the industrial steam user 5 for use, the electric power generated by the first generator 7 is used for the first steam type electrode boiler 8 to generate the low-pressure steam, and steam drain water generated by the industrial steam user 5 is supplied to the outside through the first drain delivery pipe 79;

at this time, the twenty-fourth valve 54, the twenty-fifth valve 55 and the twenty-eighth valve 58 are closed, the eighth valve 38, the seventeenth valve 47, the eighteenth valve 48, the nineteenth valve 49, the twentieth valve 50, the twenty-first valve 51, the twentieth valve 52 and the twenty-third valve 53 are opened and adjusted, medium-pressure steam from the industrial steam delivery pipe 73 enters the second back pressure machine 11 to drive the second generator 12 to do power generation and then enters the steam-water heat exchanger 13 to heat the heat supply network water, the other part of the medium-pressure steam directly enters the steam-water heat exchanger 13 to heat the heat supply network water, power generated by the second generator 12 is used for driving power equipment such as the drainage circulating pump 15, the heat supply network water circulating pump 16, the heat storage circulating pump 18 and the heat release circulating pump 19 to do power, steam drainage from the industrial steam user 5 enters the water heat exchanger 14 to heat the heat supply network water through the first drainage delivery pipe 79 and steam drainage formed by the steam-water heat exchanger 13, the drain water cooled by the water-water heat exchanger 14 returns to the condenser 3 through the second drain conveying pipe 82 under the driving of the drain circulating pump 15, the twenty-sixth valve 56, the twenty-seventh valve 57, the twenty-ninth valve 59, the thirty valve 60 and the thirty-first valve 61 are opened and adjusted at the same time, the return water of the heat supply network from the heating users 10 is conveyed to the water-water heat exchanger 14 through the return water pipe 84 under the driving of the heat supply network water circulating pump 16 to be heated for the first stage, and then enters the steam-water heat exchanger 13 to be heated for the second stage, and the high-temperature heat supply network water is conveyed to the heating users 10 through the supply water pipe 85 of the heat supply network to be heated;

next, referring to fig. 4, the second valve 32, the third valve 33, the fourth valve 34, the fifth valve 35 and the seventh valve 37 are closed, the first valve 31 and the sixth valve 36 are opened and adjusted, and the high-pressure steam generated by the steam turbine high and medium pressure cylinder 1 is supplied to the outside through the first steam extraction branch pipe 71 and the industrial steam delivery pipe 73 in sequence;

at this time, the twelfth valve 42 is closed, the ninth valve 39, the tenth valve 40, the eleventh valve 41 and the thirteenth valve 43 are opened and adjusted, high-pressure steam from the industrial steam delivery pipe 73 firstly enters the first back pressure machine 6 to drive the first generator 7 to do work and generate power, then the generated low-pressure steam is reduced in pressure, the generated low-pressure steam is supplied to the industrial steam user 5 for use, the power generated by the first generator 7 is used for the first steam type electrode boiler 8 to generate low-pressure steam, and steam drain generated by the industrial steam user 5 is supplied to the outside through the first drain delivery pipe 79;

at this time, the twenty-fourth valve 54, the twenty-fifth valve 55 and the twenty-eighth valve 58 are closed, the eighth valve 38, the seventeenth valve 47, the eighteenth valve 48, the nineteenth valve 49, the twentieth valve 50, the twenty-first valve 51, the twentieth valve 52 and the twenty-third valve 53 are opened and adjusted, high-pressure steam from the industrial steam delivery pipe 73 enters the second back pressure machine 11 to drive the second generator 12 to do power generation and then enters the steam-water heat exchanger 13 to heat the heat supply network water, the other part of high-pressure steam directly enters the steam-water heat exchanger 13 to heat the heat supply network water, power generated by the second generator 12 is used for driving power equipment such as the drainage circulating pump 15, the heat supply network water circulating pump 16, the heat storage circulating pump 18 and the heat release circulating pump 19 to do power, steam drainage from the industrial steam user 5 enters the water heat exchanger 14 to heat the heat supply network water through the first drainage delivery pipe 79 and the steam-water heat exchanger 13, the drain water cooled by the water-water heat exchanger 14 is driven by the drain circulating pump 15 to return to the condenser 3 through the second drain conveying pipe 82, the twenty-sixth valve 56, the twenty-seventh valve 57, the twenty-ninth valve 59, the thirty valve 60 and the thirty-first valve 61 are opened and adjusted at the same time, the return water of the heat supply network from the heating users 10 is driven by the heat supply network water circulating pump 16 to be conveyed to the water-water heat exchanger 14 through the heat supply network return water pipe 84 to be heated by the first stage, and then enters the steam-water heat exchanger 13 to be heated by the second stage, and the high-temperature heat supply network water is conveyed to the heating users 10 through the heat supply network water supply pipe 85 to be heated.

When the grid 20 needs to increase the electrical load to take up the excess power of the grid 20:

opening and increasing the opening degrees of a thirty-sixth valve 66 and a thirty-seventh valve 67, increasing the opening degrees of an eighteenth valve 48 and a nineteenth valve 49, generating steam by the second steam type electrode boiler 21 by using power provided by the power grid 20, transmitting the steam to the second back press 11 through a third steam branch pipe 91 to do work, and then entering the steam-water heat exchanger 13, thereby increasing the steam flow entering the steam-water heat exchanger 13;

at this time, the thirtieth and thirty-

fifth valves

62 and 63 are opened and adjusted, the thirty-fourth and thirty-

fifth valves

64 and 65 are closed, and the hot water thermal storage device 17 stores heat to absorb the heat supplied by the steam-water heat exchanger 13 and the water-water heat exchanger 14, thereby ensuring the heating demand of the heating user 10.

When the grid 20 needs to reduce the electrical load to make up for the insufficient power of the grid 20:

reducing the opening degrees of the thirty-sixth valve 66 and the thirty-seventh valve 67 until the valves are closed, reducing the opening degrees of the eighteenth valve 48 and the nineteenth valve 49, reducing the power provided by the power grid 20 to the second steam type electrode boiler 21 until the power is zero, and reducing the steam flow transmitted by the second steam type electrode boiler 21 to the second back press 11 and the steam-water heat exchanger 13 until the steam flow is zero;

at this time, the thirty-fourth valve 64 and the thirty-fifth valve 65 are opened and adjusted, the thirty-second valve 62 and the thirty-third valve 63 are closed, and the hot water thermal storage device 17 releases heat to supplement the heat which is less supplied by the steam-water heat exchanger 13 and the water-water heat exchanger 14, thereby ensuring the heating demand of the heating user 10.

In the load adjustment method of the embodiment, when the price per unit steam heat provided by the first steam type electrode boiler 8 to the water-water heat exchanger 14 is larger than the price per unit steam heat provided by the industrial steam delivery pipe 73 to the industrial steam consumer 5, the fourteenth valve 44 is closed, the fifteenth valve 45 and the sixteenth valve 46 are opened, and the steam from the first steam type electrode boiler 8 and the externally-supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device 9 to form hot water, and then the hot water is supplied to the water-water heat exchanger 14 through the first drain delivery pipe 79 to heat the heating consumer 10.

In the load adjustment method of the embodiment, when the price per unit of steam heat provided by the first steam electrode boiler 8 to the water-water heat exchanger 14 is less than the price per unit of steam heat provided by the industrial steam delivery pipe 73 to the industrial steam consumer 5, the fifteenth valve 45 and the sixteenth valve 46 are closed, the fourteenth valve 44 is opened, and the steam from the first steam electrode boiler 8 is directly provided to the industrial steam consumer 5 for use.

In the load adjustment method of the embodiment, when the unit steam price provided by the industrial steam delivery pipe 73 is greater than the unit steam price provided by the second steam type electrode boiler 21, the opening degrees of the ninth valve 39 and the seventeenth valve 47 are reduced until the second valve is closed, the thirty-sixth valve 66, the thirty-seventh valve 67 and the thirty-eighth valve 68 are opened and adjusted, the steam flow rate supplied to the industrial steam user 5 and the steam-water heat exchanger 13 by the second steam type electrode boiler 21 is increased, and the steam flow rate supplied to the industrial steam user 5 and the steam-water heat exchanger 13 by the industrial steam delivery pipe 73 is reduced until the steam flow rate is zero.

In the load adjustment method of the embodiment, when the price per unit steam provided by the industrial steam delivery pipe 73 is less than the price per unit steam provided by the second steam type electrode boiler 21, the openings of the thirty-sixth valve 66, the thirty-seventh valve 67 and the thirty-eighth valve 68 are closed until closed, the ninth valve 39 and the seventeenth valve 47 are opened and adjusted, the steam flow supplied to the industrial steam user 5 and the steam-water heat exchanger 13 by the industrial steam delivery pipe 73 is increased, and the steam flow supplied to the industrial steam user 5 and the steam-water heat exchanger 13 by the second steam type electrode boiler 21 is reduced until zero.

In the load adjustment method of this embodiment, when the cogeneration unit needs to change the electric load rate to operate, if the steam flow rate externally supplied by the high and medium pressure turbine cylinders 1 and the low pressure turbine cylinders 2 needs to be increased, all the steam supplied in excess is sent to the second back pressure machine 11 and the steam-water heat exchanger 13 to heat the heat supply network water, at this time, the thirtieth valve 62 and the thirtieth valve 63 are opened and adjusted, the thirty-fourth valve 64 and the thirty-fifth valve 65 are closed, and the hot water heat storage device 17 stores heat to absorb the heat supplied in excess by the steam-water heat exchanger 13 and the water-water heat exchanger 14, thereby ensuring the heating demand of the heating user 10; if the steam flow supplied to the outside by the steam turbine high and medium pressure cylinder 1 and the steam turbine low pressure cylinder 2 needs to be reduced, the steam flow supplied to the second back pressure machine 11 and the steam-water heat exchanger 13 is similarly reduced, at this time, the thirty-fourth valve 64 and the thirty-fifth valve 65 are opened and adjusted, the thirty-fourth valve 62 and the thirty-third valve 63 are closed, and the hot water heat storage device 17 releases heat to the outside to supplement the heat which is less supplied by the steam-water heat exchanger 13 and the water-water heat exchanger 14, thereby ensuring the heating demand of the heating user 10.

In the load adjustment method of this embodiment, when the return water pressure of the heating system from the heating user 10 is low, the twenty-fifth valve 55 is also opened, the eighth valve 38 is closed, and the drain water from the water-water heat exchanger 14 is driven by the drain water circulating pump 15 to be conveyed to the return water pipe 84 of the heating system via the second drain bypass 83, so as to implement water supplement and pressure fixation for the heating system of the heating user 10.

In the load adjustment method of the present embodiment, when the power consumption of the power equipment such as the drain circulation pump 15, the grid water circulation pump 16, the heat storage circulation pump 18, and the heat release circulation pump 19 changes, the opening degrees of the eighteenth valve 48, the nineteenth valve 49, and the twentieth valve 50 are adjusted to change the steam flow entering the second back pressure machine 11, thereby changing the power generation amount of the second generator 12 to match the power consumption of the power equipment such as the drain circulation pump 15, the grid water circulation pump 16, the heat storage circulation pump 18, and the heat release circulation pump 19.

Those not described in detail in this specification are well within the skill of the art.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A diversified heating system for peak shaving of a cogeneration system, comprising: the system comprises a steam turbine high and medium pressure cylinder (1), a steam turbine low pressure cylinder (2), a condenser (3), a steam pressure matcher (4), an industrial steam user (5), a first back pressure machine (6), a first generator (7), a first steam type electrode boiler (8), a steam-water mixed heating device (9), a heating user (10), a second back pressure machine (11), a second generator (12), a steam-water heat exchanger (13), a water-water heat exchanger (14), a drainage circulating pump (15), a heat supply network water circulating pump (16), a hot water heat storage device (17), a heat storage circulating pump (18), a heat release circulating pump (19), a power grid (20) and a second steam type electrode boiler (21), wherein a steam exhaust port of the steam turbine high and medium pressure cylinder (1) is connected with a steam inlet of the steam turbine low pressure cylinder (2), and a steam exhaust port of the steam turbine low pressure cylinder (2) is connected with a steam inlet of the condenser (3), the high-pressure steam extraction port of the high-intermediate pressure cylinder (1) of the steam turbine is connected with the high-pressure steam inlet of the steam pressure matcher (4), a first valve (31) is installed at the high-pressure steam extraction port of the high-intermediate pressure cylinder (1) of the steam turbine, a second valve (32) is installed at the high-pressure steam inlet of the steam pressure matcher (4), the low-pressure steam extraction port of the low-pressure cylinder (2) of the steam turbine is connected with the low-pressure steam inlet of the steam pressure matcher (4), a third valve (33) is installed at the low-pressure steam extraction port of the low-pressure cylinder (2) of the steam turbine, a fourth valve (34) is installed at the low-pressure steam inlet of the steam pressure matcher (4), the medium-pressure steam outlet of the steam pressure matcher (4) is connected with the steam inlet of an industrial steam conveying pipe (73), a fifth valve (35) is installed at the medium-pressure steam outlet of the steam pressure matcher (4), and the steam inlet of the industrial steam conveying pipe (73) is further connected with a first steam extraction branch pipe (71) and a second steam extraction branch pipe (72) ) The steam outlet end of the industrial steam conveying pipe (73) is connected with the steam inlet of the first back press machine (6) and the steam inlet of the second back press machine (11) through a first industrial steam branch pipe (74) and a second industrial steam branch pipe (75) respectively, a ninth valve (39) is installed on the first industrial steam branch pipe (74), a tenth valve (40) is installed at the steam inlet of the first back press machine (6), a seventeenth valve (47) is installed on the second industrial steam branch pipe (75), an eighteenth valve (48) is installed at the steam inlet of the second back press machine (11), the steam outlet of the first back press machine (6) is connected with the steam inlet of an industrial steam user (5), an eleventh valve (41) is installed at a steam outlet of the first back press (6), the first back press (6) drives the first generator (7) to do work and generate power, the power generated by the first generator (7) is transmitted to the first steam type electrode boiler (8) to generate steam, a steam outlet of the first steam type electrode boiler (8) is respectively connected with a steam inlet of an industrial steam user (5) and a steam inlet of the steam-water mixed heating device (9) through a first steam branch pipe (77) and a second steam branch pipe (78), a fourteenth valve (44) is installed on the first steam branch pipe (77), a fifteenth valve (45) is installed on the second steam branch pipe (78), a steam outlet of the second back press (11) is connected with a steam inlet of the steam-water heat exchanger (13), and a nineteenth valve (49) is installed at a steam outlet of the second back press (11), the second back press machine (11) drives a second generator (12) to do work and generate power, a drain outlet of the steam-water heat exchanger (13) is connected with a drain inlet of the water-water heat exchanger (14), a twenty-first valve (51) is installed at the drain outlet of the steam-water heat exchanger (13), a drain inlet of the water-water heat exchanger (14) is provided with a twenty-twelve valve (52), a drain inlet of the water-water heat exchanger (14) is also connected with a drain outlet of an industrial steam user (5) and a high-temperature water outlet of the steam-water mixed heating device (9) through a first drain conveying pipe (79), a thirteenth valve (43) is installed at a drain outlet of the industrial steam user (5), a sixteenth valve (46) is installed at a high-temperature water outlet of the steam-water mixed heating device (9), and a drain outlet of the water-water heat exchanger (14) is connected with the drain inlet of the condenser (3) through a second drain conveying pipe (82), a second thirteen valve (53) is arranged at a drain outlet of the water-water heat exchanger (14), a drain circulating pump (15) is arranged on a second drain conveying pipe (82), an eighth valve (38) is arranged at a drain inlet of the condenser (3), a heat supply network water outlet of a heating user (10) is connected with a heat supply network water inlet of the water-water heat exchanger (14) through a heat supply network water return pipe (84), a heat supply network water circulating pump (16) is arranged on the heat supply network water return pipe (84), a twenty-sixth valve (56) is arranged at a heat supply network water inlet of the water-water heat exchanger (14), a heat supply network water outlet of the water-water heat exchanger (14) is connected with a water inlet of the steam-water heat exchanger (13), a twenty-seventh valve (57) is arranged at a heat supply network water outlet of the water-water heat exchanger (14), a twenty-ninth valve (59) is arranged at a water inlet of the steam-water heat exchanger (13), a water outlet of the steam-water heat exchanger (13) is connected with a heat supply network water inlet of a heating user (10) through a heat supply network water supply pipe (85), a thirtieth valve (60) is installed at the water outlet of the steam-water heat exchanger (13), a thirty-first valve (61) is installed on the heat supply network water supply pipe (85), a heat storage end of the hot water heat storage device (17) is respectively connected with the heat supply network water inlet of the water-water heat exchanger (14) and the water outlet of the steam-water heat exchanger (13) through a first heat storage pipe (87) and a second heat storage pipe (88), a thirty-two valve (62) and a heat storage circulating pump (18) are installed on the first heat storage pipe (87), a thirteen valve (63) is installed on the second heat storage pipe (88), a heat release end of the hot water heat storage device (17) is respectively connected with the water outlet of the heat supply network water circulating pump (16) and a water inlet of the heat supply network water supply pipe (85) through a first heat release pipe (89) and a second heat release pipe (90), and install thirty fourth valve (64) on first exothermal pipe (89), install thirty fifth valve (65) and exothermic circulating pump (19) on second exothermal pipe (90), electric wire netting (20) provide electric power for second steam formula electrode boiler (21), the steam outlet of second steam formula electrode boiler (21) passes through third steam branch pipe (91) and fourth steam branch pipe (92) and is connected with the steam inlet of second back pressure machine (11) and the steam inlet of first back pressure machine (6) respectively, and installs thirty sixth valve (66) at the steam outlet of second steam formula electrode boiler (21), installs thirty seventh valve (67) on third steam branch pipe (91), installs thirty eighth valve (68) on fourth steam branch pipe (92).

2. The diversified heating system for peak shaving of a cogeneration system of heat and power according to claim 1, wherein a first steam bypass (76) is provided between the steam inlet and the steam outlet of the first back press (6), and a twelfth valve (42) is installed on the first steam bypass (76), a second steam bypass (80) is provided between the steam inlet and the steam outlet of the second back press (11), and a twentieth valve (50) is installed on the second steam bypass (80).

3. The diversified heat supply system for peak shaving of a cogeneration system of claim 1, wherein the mixed steam-water heating device (9) is a direct contact heat exchanger, and the steam from the first steam type electrode boiler (8) and externally supplied feed water are subjected to mixed heat exchange in the mixed steam-water heating device (9).

4. The diversified heating system for peak shaving of a cogeneration system of claim 1, wherein the water-repellent side of the water-water heat exchanger (14) is provided with a first water-repellent bypass (81), and a twenty-fourth valve (54) is installed on the first water-repellent bypass (81), the grid water side of the water-water heat exchanger (14) is provided with a grid water bypass (86), and a twenty-eighth valve (58) is installed on the grid water bypass (86).

5. The diversified heating system for peak shaving of a cogeneration system of heat and power according to claim 1, wherein a second hydrophobic bypass (83) is arranged between the water outlet of the hydrophobic circulation pump (15) and the heat supply network water return pipe (84), and a twenty-fifth valve (55) is installed on the second hydrophobic bypass (83).

6. The diversified heating system for peak shaving of a cogeneration system of claim 1, wherein the electricity generated by the second generator (12) is used to drive a hydrophobic circulation pump (15), a grid water circulation pump (16), a heat storage circulation pump (18) and a heat release circulation pump (19) to do work, and the electricity generated by the first generator (7) is also used to drive a power plant of an industrial steam consumer (5) to do work.

7. An economic regulation method of a diversified heating system for peak shaving of a cogeneration system according to any one of claims 1 to 6, characterized in that the regulation method is as follows:

when the cogeneration unit needs to operate at a high electrical load rate:

only opening and adjusting the third valve (33) and the seventh valve (37), and supplying low-pressure steam generated by the steam turbine low-pressure cylinder (2) to the outside through a second steam extraction branch pipe (72) and an industrial steam conveying pipe (73) in sequence;

at the moment, a tenth valve (40), an eleventh valve (41), a fourteenth valve (44), a fifteenth valve (45) and a sixteenth valve (46) are closed, a ninth valve (39), a twelfth valve (42) and a thirteenth valve (43) are opened and adjusted, low-pressure steam from an industrial steam conveying pipe (73) is directly supplied to an industrial steam user (5) for use, and steam drainage generated by the industrial steam user (5) is externally supplied through a first drainage conveying pipe (79);

at the moment, an eighteenth valve (48), a nineteenth valve (49), a twenty-fourth valve (54), a twenty-fifth valve (55) and a twenty-eighth valve (58) are closed, an eighth valve (38), a seventeenth valve (47), a twentieth valve (50), a twenty-first valve (51), a twenty-twelfth valve (52) and a twenty-third valve (53) are opened and adjusted, low-pressure steam from an industrial steam conveying pipe (73) directly enters a steam-water heat exchanger (13) to heat network water, steam drainage water from an industrial steam user (5) enters a water-water heat exchanger (14) through a first drainage conveying pipe (79) and steam drainage water formed by the steam-water heat exchanger (13) to heat the network water simultaneously, the drainage water cooled by the water-water heat exchanger (14) returns to the condenser (3) through a second drainage conveying pipe (82) under the driving of a drainage circulating pump (15), meanwhile, a twenty-sixth valve (56), a twenty-seventh valve (57), a twenty-ninth valve (59), a thirty-third valve (60) and a thirty-first valve (61) are opened and adjusted, return water of a heat supply network from a heating user (10) is driven by a heat supply network water circulating pump (16) and is conveyed to a water-water heat exchanger (14) through a heat supply network return water pipe (84) to be heated for the first stage, then enters a steam-water heat exchanger (13) to be heated for the second stage, and then forms high-temperature heat supply network water which is conveyed to the heating user (10) through a heat supply network water supply pipe (85) to be heated, and electric power required by the work of a drainage circulating pump (15), the heat supply network water circulating pump (16), a heat storage circulating pump (18) and a heat release circulating pump (19) at the moment is provided by a power grid (20);

when the cogeneration unit needs to operate at a low electrical load rate:

firstly, opening and adjusting a first valve (31), a second valve (32), a third valve (33), a fourth valve (34) and a fifth valve (35), closing a sixth valve (36) and a seventh valve (37), mixing high-pressure steam generated by a high and medium pressure turbine cylinder (1) and low-pressure steam generated by a low pressure turbine cylinder (2) into a steam pressure matcher (4), and then supplying formed medium-pressure steam out through an industrial steam conveying pipe (73);

at the moment, a twelfth valve (42) is closed, a ninth valve (39), a tenth valve (40), an eleventh valve (41) and a thirteenth valve (43) are opened and adjusted, medium-pressure steam from an industrial steam conveying pipe (73) enters a first back-pressing machine (6) to drive a first generator (7) to do work and generate power, then the pressure is reduced, then the formed low-pressure steam is supplied to industrial steam users (5) for use, the power generated by the first generator (7) is used for a first steam type electrode boiler (8) to generate the low-pressure steam, and steam generated by the industrial steam users (5) is drained and supplied to the outside through a first drainage conveying pipe (79);

at the moment, a twenty-fourth valve (54), a twenty-fifth valve (55) and a twenty-eighth valve (58) are closed, an eighth valve (38), a seventeenth valve (47), an eighteenth valve (48), a nineteenth valve (49), a twentieth valve (50), a twenty-first valve (51), a twenty-second valve (52) and a twenty-third valve (53) are opened and adjusted, medium-pressure steam from an industrial steam conveying pipe (73) enters a second back press (11) firstly to drive a second generator (12) to do work and generate power and then enters a steam-water heat exchanger (13) to heat network water, the other part of the medium-pressure steam directly enters the steam-water heat exchanger (13) to heat the network water, electric power generated by the second generator (12) is used for driving a drain circulating pump (15), a network water circulating pump (16), a heat storage circulating pump (18) and a heat releasing circulating pump (19) to do work, steam drain from an industrial steam user (5) passes through a first drain conveying pipe (79) to exchange heat network water with a steam-water heat exchanger Steam drainage formed by the device (13) enters the water-water heat exchanger (14) to heat the heat supply network water at the same time, the drainage cooled by the water-water heat exchanger (14) returns to the condenser (3) through the second drainage conveying pipe (82) under the drive of the drainage circulating pump (15), and meanwhile, a twenty-sixth valve (56), a twenty-seventh valve (57), a twenty-ninth valve (59), a thirty valve (60) and a thirty-eleventh valve (61) are opened and adjusted, heat supply network return water from a heating user (10) is conveyed to the water-water heat exchanger (14) through a heat supply network return water pipe (84) under the drive of the heat supply network water circulating pump (16) to be heated for the first stage, then enters the steam-water heat exchanger (13) to be heated for the second stage, and then the formed high-temperature heat supply network water is conveyed to the heating user (10) through a heat supply network water pipe (85) to be heated;

secondly, closing a second valve (32), a third valve (33), a fourth valve (34), a fifth valve (35) and a seventh valve (37), opening and adjusting a first valve (31) and a sixth valve (36), and supplying high-pressure steam generated by the steam turbine high-medium pressure cylinder (1) to the outside through a first steam extraction branch pipe (71) and an industrial steam conveying pipe (73) in sequence;

at the moment, a twelfth valve (42) is closed, a ninth valve (39), a tenth valve (40), an eleventh valve (41) and a thirteenth valve (43) are opened and adjusted, high-pressure steam from an industrial steam conveying pipe (73) firstly enters a first back pressure machine (6) to drive a first generator (7) to do work and generate power, then the pressure is reduced, then the formed low-pressure steam is supplied to industrial steam users (5) for use, the power generated by the first generator (7) is used for a first steam type electrode boiler (8) to generate the low-pressure steam, and steam generated by the industrial steam users (5) is drained and supplied to the outside through a first drainage conveying pipe (79);

at the moment, a twenty-fourth valve (54), a twenty-fifth valve (55) and a twenty-eighth valve (58) are closed, an eighth valve (38), a seventeenth valve (47), an eighteenth valve (48), a nineteenth valve (49), a twentieth valve (50), a twenty-first valve (51), a twenty-second valve (52) and a twenty-third valve (53) are opened and adjusted, high-pressure steam from an industrial steam conveying pipe (73) enters a second back press (11) firstly to drive a second generator (12) to do work and generate power and then enters a steam-water heat exchanger (13) to heat supply network water, the other part of high-pressure steam directly enters the steam-water heat exchanger (13) to heat supply network water, electric power generated by the second generator (12) is used for driving a drain circulating pump (15), a heat supply network water circulating pump (16), a heat storage circulating pump (18) and a heat release circulating pump (19) to do work, steam drain from an industrial steam user (5) passes through the first drain conveying pipe (79) and the steam-water conveying pipe (79) and heat exchange with a heat exchange pipe (13) Steam drainage formed by the device (13) enters the water-water heat exchanger (14) to heat the heat supply network water at the same time, the drainage cooled by the water-water heat exchanger (14) returns to the condenser (3) through the second drainage conveying pipe (82) under the drive of the drainage circulating pump (15), and meanwhile, a twenty-sixth valve (56), a twenty-seventh valve (57), a twenty-ninth valve (59), a thirty valve (60) and a thirty-eleventh valve (61) are opened and adjusted, heat supply network return water from a heating user (10) is conveyed to the water-water heat exchanger (14) through a heat supply network return water pipe (84) under the drive of the heat supply network water circulating pump (16) to be heated for the first stage, then enters the steam-water heat exchanger (13) to be heated for the second stage, and then the formed high-temperature heat supply network water is conveyed to the heating user (10) through a heat supply network water pipe (85) to be heated;

when the power grid (20) needs to increase the electric load to absorb the redundant power of the power grid (20):

opening and increasing the opening degrees of a thirty-sixth valve (66) and a thirty-seventh valve (67), increasing the opening degrees of an eighteenth valve (48) and a nineteenth valve (49), wherein the second steam type electrode boiler (21) utilizes the power provided by the power grid (20) to produce steam, and the steam is conveyed to the second back press (11) through a third steam branch pipe (91) to do work and then enters the steam-water heat exchanger (13), so that the steam flow entering the steam-water heat exchanger (13) is increased;

at the moment, a thirty-second valve (62) and a thirty-third valve (63) are opened and adjusted, a thirty-fourth valve (64) and a thirty-fifth valve (65) are closed, and the hot water heat storage device (17) stores heat to absorb the heat supplied by the steam-water heat exchanger (13) and the water-water heat exchanger (14), so that the heating requirement of a heating user (10) is ensured;

when the power grid (20) needs to reduce the power load to make up for the insufficient power of the power grid (20):

reducing the opening degree of a thirty-sixth valve (66) and a thirty-seventh valve (67) until the valves are closed, reducing the opening degree of an eighteenth valve (48) and a nineteenth valve (49), reducing the power provided by the power grid (20) to the second steam type electrode boiler (21) until the power is zero, and reducing the steam flow transmitted by the second steam type electrode boiler (21) to the second back press (11) and the steam-water heat exchanger (13) until the steam flow is zero;

at the moment, a thirty-fourth valve (64) and a thirty-fifth valve (65) are opened and adjusted, a thirty-second valve (62) and a thirty-third valve (63) are closed, and the hot water heat storage device (17) releases heat to the outside to supplement the heat which is less supplied by the steam-water heat exchanger (13) and the water-water heat exchanger (14), so that the heating demand of a heating user (10) is ensured.

8. The economic conditioning method for a peak shaving multivariate heating system for a combined heat and power generation system according to claim 7, characterized in that:

when the price of the unit steam heat provided by the first steam type electrode boiler (8) to the water-water heat exchanger (14) is larger than the price of the unit steam heat provided by the industrial steam delivery pipe (73) to the industrial steam user (5), the fourteenth valve (44) is closed, the fifteenth valve (45) and the sixteenth valve (46) are opened, the steam from the first steam type electrode boiler (8) and externally supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device (9) to form hot water, and then the hot water is supplied to the water-water heat exchanger (14) through the first hydrophobic delivery pipe (79) to supply heat to the heating user (10);

when the price of the steam heat provided by the first steam type electrode boiler (8) to the water-water heat exchanger (14) is less than the price of the steam heat provided by the industrial steam conveying pipe (73) to the industrial steam user (5), the fifteenth valve (45) and the sixteenth valve (46) are closed, the fourteenth valve (44) is opened, and the steam from the first steam type electrode boiler (8) is directly provided for the industrial steam user (5) to use;

when the unit steam price provided by the industrial steam conveying pipe (73) is larger than that provided by the second steam type electrode boiler (21), the opening degrees of the ninth valve (39) and the seventeenth valve (47) are reduced until the ninth valve is closed, the thirty-sixth valve (66), the thirty-seventh valve (67) and the thirty-eighth valve (68) are opened and adjusted, the steam flow rate supplied to the industrial steam user (5) and the steam-water heat exchanger (13) by the second steam type electrode boiler (21) is increased, and the steam flow rate supplied to the industrial steam user (5) and the steam-water heat exchanger (13) by the industrial steam conveying pipe (73) is reduced until the steam price is zero;

when the unit steam price provided by the industrial steam conveying pipe (73) is less than that provided by the second steam type electrode boiler (21), the opening degrees of a thirty-sixth valve (66), a thirty-seventh valve (67) and a thirty-eighth valve (68) are reduced until the valve is closed, a ninth valve (39) and a seventeenth valve (47) are opened and adjusted, the steam flow supplied to the industrial steam user (5) and the steam-water heat exchanger (13) by the industrial steam conveying pipe (73) is increased, and the steam flow supplied to the industrial steam user (5) and the steam-water heat exchanger (13) by the second steam type electrode boiler (21) is reduced until the steam flow is zero.

9. The economic conditioning method for a peak shaving multivariate heating system for a combined heat and power generation system according to claim 7, characterized in that:

when the cogeneration unit needs to change the operation of the electric load rate, if the steam flow rate externally supplied by the high and medium pressure cylinders (1) and the low pressure cylinders (2) of the steam turbine needs to be increased, all the steam which is supplied more is conveyed to the second back pressure machine (11) and the steam-water heat exchanger (13) to be used for heating heat supply network water, at the moment, the thirty-two valve (62) and the thirty-three valve (63) are opened and adjusted, the thirty-fourth valve (64) and the thirty-fifth valve (65) are closed, and the hot water heat storage device (17) stores heat to absorb the heat which is supplied more by the steam-water heat exchanger (13) and the water-water heat exchanger (14), so that the heating requirement of a heating user (10) is ensured; if the steam flow supplied to the outside by the high and medium pressure turbine cylinder (1) and the low pressure turbine cylinder (2) needs to be reduced, the steam flow supplied to the second back pressure machine (11) and the steam-water heat exchanger (13) is reduced, at the moment, a thirty-fourth valve (64) and a thirty-fifth valve (65) are opened and adjusted, a thirty-twelfth valve (62) and a thirty-thirteenth valve (63) are closed, and the hot water heat storage device (17) releases heat to the outside to supplement the heat which is less supplied by the steam-water heat exchanger (13) and the water-water heat exchanger (14), so that the heating requirement of a heating user (10) is ensured.

10. The economic conditioning method for a peak shaving multivariate heating system for a combined heat and power generation system according to claim 7, characterized in that:

when the return water pressure of the heat supply network from the heating user (10) is low, a twenty-fifth valve (55) is opened, an eighth valve (38) is closed, and the drain water from the water-water heat exchanger (14) is driven by a drain water circulating pump (15) to be conveyed to a return water pipe (84) of the heat supply network through a second drain water bypass (83), so that water supplementing and constant pressure are performed on the heating system of the heating user (10);

when the power consumption of the drainage circulating pump (15), the heat supply network water circulating pump (16), the heat storage circulating pump (18) and the heat release circulating pump (19) is changed, the opening degrees of an eighteenth valve (48), a nineteenth valve (49) and a twentieth valve (50) are adjusted, and the steam flow entering the second back press machine (11) is changed, so that the power generation amount of the second generator (12) is changed to match the power consumption of the drainage circulating pump (15), the heat supply network water circulating pump (16), the heat storage circulating pump (18) and the heat release circulating pump (19).