ORC power generation system based on parameter change heat source

Abstract

The utility model relates to the field of waste heat power generation, and discloses an ORC power generation system based on a parameter change heat source, which comprises a steam main pipe, an evaporator, a preheater, an ORC turbine generator set, a condenser, a working medium pump, a front heat exchanger, a working medium branch pipe, a first regulating valve, a second regulating valve and a temperature measuring device, the front heat exchanger, the evaporator and the preheater are sequentially arranged on the steam main pipe; the working medium pump, the preheater, the evaporator, the ORC turbine generator set, the condenser and the working medium pump are connected into a closed loop through a working medium main pipe; the other end of the working medium branch pipe is connected with a working medium inlet of the evaporator through the front heat exchanger; the first adjusting valve is arranged on the working medium branch pipe and located at the working medium inlet end of the front heat exchanger. The second adjusting valve is arranged on the working medium main pipe and located at the working medium inlet end of the preheater. And the temperature measuring device is arranged at a steam outlet of the front heat exchanger. Over-temperature steam can be cooled by the aid of organic working media, and the system can be guaranteed to run safely, stably and efficiently.

Description

Technical Field

[0001] The utility model relates to the field of waste heat power generation, in particular to an ORC power generation system based on a parameter-variable heat source. Background Art

[0002] In the steel and chemical industries, there are various heating furnaces and reactors. Heating furnaces and reactors generally discharge flue gas with a certain temperature, which contains a part of recoverable heat. Since the flue gas flow rate of heating furnaces and reactors is generally 40,000-70,000 NM 3 / h, with a temperature of around 350°C, and is generally used to generate low-parameter steam. Due to production adjustments in heating furnaces and reactors, steam flow and temperature fluctuate. Currently, some companies mainly use it for power generation in ORC power generation systems.

[0003] Because the reactor and heating furnace undergo production adjustments, the parameters of the steam produced by the waste heat boiler also change. In current ORC power generation systems, steam is directly fed into the evaporator to release heat, prompting the ORC organic working fluid to produce ORC steam, which then enters the organic working fluid generator set to perform work. Fluctuations in waste heat steam parameters can cause steam temperatures to exceed 200°C. Currently, organic working fluid power generation primarily uses pentafluoropropane, which has a decomposition temperature of 180°C. Decomposition of pentafluoropropane reduces the heat exchange efficiency of the evaporator, leading some companies to vent steam into the air to protect the ORC power generation system. Therefore, how to deal with situations where steam temperatures exceed the decomposition temperature of pentafluoropropane and ensure safe and stable system operation is a concern for the organic working fluid power generation industry.

[0004] Based on this, the present application provides an ORC power generation system that can utilize low-temperature organic working fluid to cool superheated steam to ensure the safe operation of the system. Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art. To this end, the present invention provides an ORC power generation system based on a parameter-variable heat source, which can use low-temperature organic working fluid to cool overheated steam, ensuring the safe operation of the system and avoiding the occurrence of organic working fluid decomposition.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The utility model provides a kind of ORC power generation system based on parameter change heat source, including steam main pipe, evaporator, preheater, ORC turbine generator set, condenser, working medium pump, front regenerator, working medium branch pipe, first regulating valve, second regulating valve and temperature measuring device;The front regenerator, evaporator and preheater are sequentially arranged on steam main pipe;The working medium pump, preheater, evaporator, ORC turbine generator set, condenser, working medium pump are connected into a closed loop by working medium main pipe;The working medium branch pipe is connected with the working medium outlet of working medium pump at one end, and is connected with the working medium inlet of evaporator through front regenerator at the other end;The first regulating valve is arranged on working medium branch pipe and located at the working medium inlet end of front regenerator;The second regulating valve is arranged on working medium main pipe and located at the working medium inlet end of preheater;The temperature measuring device is arranged at the steam outlet of front regenerator.

[0008] In some optional embodiments, a working medium circulation pipe is further arranged between the condenser and the working medium outlet of the working medium pump, and a circulation regulating valve is arranged on the working medium circulation pipe.

[0009] In some optional embodiments, a steam external delivery pipe, a pressure measuring device and a steam flow meter are further sequentially arranged on the steam main pipe and located at the steam inlet end of the front regenerator, and an external delivery regulating valve is arranged on the steam external delivery pipe.

[0010] In some optional embodiments, a second temperature measuring device is further arranged on the steam main pipe and located at the steam inlet end of the front regenerator.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The temperature measuring device is used to monitor the steam temperature entering the evaporator in real time, when the steam temperature exceeds the standard, the opening of the first regulating valve is increased and the opening of the second regulating valve is reduced, so as to increase the flow of the organic working medium to the front regenerator and reduce the steam temperature, and the system can be safely, stably and efficiently operated under different steam temperatures. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor, wherein:

[0014] Figure 1 It is the structure principle drawing of the ORC power generation system based on parameter change heat source provided by the utility model.

[0015] In the drawings, the component list represented by each sign is as follows:

[0016] 1—steam main pipe, 2—front heat exchanger, 3—evaporator, 4—preheater, 5—ORC turbine generator set, 6—condenser, 7—working fluid pump, 8—working fluid branch pipe, 9—first regulating valve, 10—second regulating valve, 11—temperature measuring device, 12—working fluid circulation pipe, 13—circulation regulating valve, 14—steam delivery pipe, 15—pressure measuring device, 16—steam flowmeter, 17—delivery regulating valve, 18—second temperature measuring device. DETAILED DESCRIPTION

[0017] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0020] In addition, the descriptions involving the terms "first", "second", etc. in the present invention are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0022] Example 1

[0023] This embodiment provides an ORC power generation system based on a parameter-variable heat source, as shown in the attached Figure 1 As shown, it includes a steam main pipe 1, a front heat exchanger 2, an evaporator 3, a preheater 4, an ORC turbine generator set 5, a condenser 6, a working fluid pump 7, a working fluid branch pipe 8, a first regulating valve 9, a second regulating valve 10 and a temperature measuring device 11, wherein:

[0024] The preheater 2, evaporator 3 and preheater 4 are sequentially arranged on the steam main pipe 1. The steam passes through the preheater 2 for preliminary heat release, then enters the evaporator 3 for condensation and heat release, and the condensed water enters the preheater 4 for further heat release, and finally enters the condensed water system;

[0025] The working fluid pump 7, preheater 4, evaporator 3, ORC turbine generator set 5, condenser 6, and working fluid pump 7 are connected to a closed loop via a working fluid main line. One end of a working fluid branch line 8 is connected to the working fluid outlet of the working fluid pump 7, and the other end is connected to the working fluid inlet of the evaporator 3 via the preheater 2. After being pressurized by the working fluid pump 7, the organic working fluid in the condenser 6 is split into two paths: one path enters the preheater 4 through the working fluid main line to absorb heat, and the other path enters the preheater 2 through the working fluid branch line 8 to absorb heat. After absorbing heat, the two paths of working fluid merge and enter the evaporator 3. After absorbing heat in the evaporator 3, the working fluid forms organic working fluid vapor at a certain temperature and pressure, which then enters the ORC turbine generator set 5 to perform work. After performing work, the organic working fluid vapor enters the condenser 6, where it releases heat and forms a liquid working fluid.

[0026] The first regulating valve 9 is located on the working medium branch pipe 8 at the working medium inlet end of the preheater 2 and is used to regulate the flow of the working medium entering the preheater. The second regulating valve 10 is located on the working medium main pipe at the working medium inlet end of the preheater 4 and is used to regulate the flow of the working medium entering the preheater. The temperature measuring device 11 is located at the steam outlet of the preheater 2 and is used to monitor the steam temperature entering the evaporator in real time and adjust the opening of the first regulating valve based on the measured steam temperature. During specific control, when the temperature measuring device detects that the steam temperature exceeds the decomposition temperature of the organic working medium, the opening of the first regulating valve is increased and the opening of the second regulating valve is decreased, thereby increasing the flow of the organic working medium to the preheater and reducing the steam temperature. When the temperature measuring device detects that the steam temperature does not exceed the decomposition temperature of the organic working medium, the first regulating valve is decreased or closed, allowing the organic working medium to flow through the working medium main pipe. The opening of the second regulating valve is determined by the load of the ORC turbine generator set.

[0027] The operation and control of the above facilities are all completed automatically by the host computer in the control room.

[0028] Preferably, a working fluid circulation pipe 12 is provided between the condenser 6 and the working fluid outlet of the working fluid pump 7, and a circulation regulating valve 13 is provided on the working fluid circulation pipe 12. The working fluid circulation pipe and the regulating valve thereon can ensure the minimum flow rate of the working fluid pump when the ORC generator set is under low load.

[0029] Preferably, the steam main pipe 1 is further provided with a steam export pipe 14, a pressure measuring device 15, and a steam flow meter 16, in sequence, at the steam inlet end of the front heat exchanger 2. The steam export pipe is also provided with a export regulating valve 17. This design enables the use of the pressure measuring device and steam flow meter to monitor the pipeline pressure and steam flow of the steam main pipe in real time. When the pipeline pressure or steam flow is excessive or the ORC generator set fails, steam can be delivered to other users through the steam export regulating valve.

[0030] Preferably, a second temperature measuring device 18 is further provided on the steam main pipe 1 at the steam inlet end of the front heat exchanger 2, which can detect the initial temperature of the steam entering the system, and cooperate with the pressure measuring device and the steam flow meter to realize real-time measurement of the flow, pressure and temperature of the steam.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An ORC power generation system based on a parameter-variable heat source, comprising a steam main, an evaporator, a preheater, an ORC turbine generator set, a condenser, and a working fluid pump; characterized in that: It also includes a front heat exchanger, a working medium branch pipe, a first regulating valve, a second regulating valve and a temperature measuring device, wherein: The front heat exchanger, evaporator and preheater are sequentially arranged on the steam main pipe; The working fluid pump, preheater, evaporator, ORC turbine generator set, condenser, and working fluid pump are connected to form a closed loop through a working fluid main pipe; One end of the working fluid branch pipe is connected to the working fluid outlet of the working fluid pump, and the other end is connected to the working fluid inlet of the evaporator via the front heat exchanger; The first regulating valve is arranged on the working medium branch pipe at the working medium inlet end of the front heat exchanger; The second regulating valve is arranged on the working medium main pipe at the working medium inlet end of the preheater; The temperature measuring device is arranged at the steam outlet of the front heat exchanger.

2. The ORC power generation system based on a parameter-variable heat source according to claim 1, characterized in that: A working medium circulation pipe is further provided between the condenser and the working medium outlet of the working medium pump, and a circulation regulating valve is provided on the working medium circulation pipe.

3. The ORC power generation system based on a parameter-variable heat source according to claim 1, characterized in that: The steam main pipe is provided with a steam delivery pipe, a pressure measuring device and a steam flow meter in sequence at the steam inlet end of the front heat exchanger. The steam delivery pipe is provided with a delivery regulating valve.

4. The ORC power generation system based on a parameter-variable heat source according to claim 3, characterized in that: The steam main pipe is also provided with a second temperature measuring device at the steam inlet end of the front heat exchanger.

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