Supercritical CO2 cycle combined heat and power generation system and operation method thereof

Abstract

The embodiment of the invention provides a supercritical CO2 cycle combined heat and power generation system and an operation method thereof. In the system, one of an outlet of a boiler, a cold side outlet of a high-temperature heat regenerator and a cold side outlet of a low-temperature heat regenerator selectively communicates with a high-pressure inlet of an ejector so as to convey high-temperature and high-pressure CO2 to the ejector; a hot side outlet of the low-temperature heat regenerator is communicated with a low-pressure inlet of the ejector so as to convey low-temperature and low-pressure CO2 to the ejector; an inlet of the heating network heater communicates with an outlet of the ejector, and an outlet of the heating network heater communicates with the supercritical CO2 coal-fired power generation system and a heating user. Low-temperature and low-pressure CO2 at the cold end of the supercritical CO2 coal-fired power generation system is injected through the ejector for heating, waste heat at the cold end of the system can be recycled, cold source losses are reduced, and the comprehensive utilization efficiency of system energy is improved; according to the heating condition, different high-temperature and high-pressure CO2 sources are selected, and the requirements of users for different heat loads are flexibly met.

Description

Technical Field

[0001] The disclosed embodiments belong to the technical field of cogeneration, and specifically relate to a supercritical CO2 cycle cogeneration system and an operation method thereof. Background Art

[0002] The supercritical CO2 power cycle has the advantages of high efficiency and flexibility. It is expected to replace the steam Rankine cycle in the field of traditional coal-fired power generation, greatly improve the power generation efficiency and peak-shaving capacity of coal-fired units, reduce the unit's pollutant and CO2 emissions, and promote the large-scale consumption of renewable energy, promote the low-carbon development of the power industry, and is of great significance to the realization of my country's "dual carbon" goals. However, the society's demand for energy products is diversified, not only for electricity, but also for heat. Traditional thermal power units can generally meet the society's demand for electricity and heat. Cogeneration units can not only reduce cold source losses and improve the energy utilization efficiency of units through heating, but also generate greater economic benefits. Therefore, the cogeneration design of new supercritical CO2 power generation units is also particularly important. At present, research on supercritical CO2 cycle coal-fired power generation technology focuses more on its efficient and flexible power generation, but less on the efficient heating design of units.

[0003] In view of the above problems, it is necessary to propose a supercritical CO2 cycle cogeneration system and its operation method that are reasonably designed and effectively solve the above problems. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a supercritical CO2 cycle cogeneration system and an operation method thereof.

[0005] One aspect of the embodiments of the present disclosure provides a supercritical CO2 cycle cogeneration system, including a supercritical CO2 coal-fired power generation system and a heating system; the supercritical CO2 coal-fired power generation system includes a boiler, a high-temperature regenerator, a low-temperature regenerator and a second-stage precooler, and the heating system includes an ejector and a heat network heater; wherein,

[0006] The hot side outlet of the low-temperature regenerator is connected to the low-pressure inlet of the ejector to transport low-temperature and low-pressure CO2 to the ejector;

[0007] One of the outlet of the boiler, the cold side outlet of the high temperature regenerator and the cold side outlet of the low temperature regenerator is selectively connected to the high pressure inlet of the ejector to deliver high temperature and high pressure CO2 to the ejector;

[0008] The inlet of the heat network heater is connected to the outlet of the ejector, and the outlet of the heat network heater is respectively connected to the supercritical CO2 coal-fired power generation system and the heating user;

[0009] The ejector is used to mix the high-temperature and high-pressure CO2 and the low-temperature and low-pressure CO2 into medium-temperature and medium-pressure CO2 and then transport it to the heating network heater.

[0010] Optionally, at the beginning and end of heating, the cold side outlet of the low-temperature regenerator is connected to the high-pressure inlet of the ejector;

[0011] In the middle stage of heating, one of the outlet of the boiler or the cold side outlet of the high temperature regenerator is connected to the high pressure inlet of the ejector.

[0012] Optionally, the heating system further comprises a first valve;

[0013] The first valve is arranged in the communication pipeline between the boiler and the ejector.

[0014] Optionally, the heating system further comprises a second valve;

[0015] The second valve is arranged in the connecting pipeline between the high-temperature regenerator and the ejector.

[0016] Optionally, the heating system further comprises a third valve;

[0017] The third valve is arranged in the connecting pipeline between the low-temperature regenerator and the ejector.

[0018] Optionally, the supercritical CO2 coal-fired power generation system further includes a first-stage main compressor, a second-stage main compressor, a first-stage precooler, and a second-stage precooler;

[0019] The inlet of the first-stage precooler is connected to the hot side outlet of the low-temperature regenerator, and the outlet of the first-stage precooler is connected to the inlet of the first-stage main compressor;

[0020] The inlet of the second-stage precooler is respectively connected to the outlet of the first-stage main compressor and the low-pressure inlet of the ejector, and the outlet of the second-stage precooler is connected to the inlet of the second-stage main compressor;

[0021] The outlet of the second-stage main compressor is communicated with the cold-side inlet of the low-temperature regenerator.

[0022] Optionally, the supercritical CO2 coal-fired power generation system further includes a recompressor;

[0023] The inlet and outlet of the recompressor are respectively connected to the hot side outlet of the low-temperature regenerator and the cold side outlet of the low-temperature regenerator.

[0024] Optionally, the supercritical CO2 coal-fired power generation system further comprises a turbine;

[0025] The inlet of the turbine is connected to the outlet of the boiler, and the outlet of the turbine is connected to the inlet of the high-temperature regenerator;

[0026] The cold side outlet of the high temperature regenerator is connected to the inlet of the boiler;

[0027] The hot side outlet of the high temperature regenerator is connected to the hot side inlet of the low temperature regenerator;

[0028] The cold side outlet of the low temperature regenerator is communicated with the cold side inlet of the high temperature regenerator.

[0029] Another aspect of the present disclosure provides an operation method of a supercritical CO2 cycle cogeneration system, using the supercritical CO2 cycle cogeneration system described above; the operation method comprises:

[0030] Connecting the hot side outlet of the low-temperature regenerator to the low-pressure inlet of the ejector to deliver low-temperature and low-pressure CO2 to the ejector;

[0031] According to the heating conditions, one of the outlet of the boiler, the cold side outlet of the high temperature regenerator and the cold side outlet of the low temperature regenerator is selectively connected to the high pressure inlet of the ejector to deliver high temperature and high pressure CO2 to the ejector;

[0032] The inlet of the heat network heater is connected to the outlet of the ejector, and the outlet of the heat network heater is connected to the supercritical CO2 coal-fired power generation system and the heating user respectively; wherein

[0033] The high-temperature and high-pressure CO2 and the low-temperature and low-pressure CO2 are mixed into medium-temperature and medium-pressure CO2 through the ejector and then transported to the heating network heater.

[0034] Optionally, the operating method further includes:

[0035] At the beginning and end of heating, the cold side outlet of the low-temperature regenerator is connected to the high-pressure inlet of the ejector, and the high-temperature and high-pressure CO2 of the low-temperature regenerator is transported to the ejector;

[0036] In the middle of heating, one of the outlet of the boiler or the cold side outlet of the high-temperature regenerator is connected to the high-pressure inlet of the ejector, and the high-temperature and high-pressure CO2 of the boiler or the high-temperature regenerator is transported to the ejector.

[0037] The supercritical CO2 cycle cogeneration system and operation method of the disclosed embodiment are characterized in that an ejector is provided in the system, and a high-temperature and high-pressure CO2 gas flow from one of a boiler, a high-temperature regenerator, and a low-temperature regenerator is used to eject a low-temperature and low-pressure CO2 gas flow at the cold end of a supercritical CO2 coal-fired power generation system. The two gas flows are mixed into a medium-temperature and medium-pressure CO2 gas flow in the ejector and then enter the heat network heater for heating. A portion of the heated medium-temperature and medium-pressure CO2 is used for heating users, and the other portion is returned to the supercritical CO2 coal-fired power generation system to participate in the circulation. By ejecting the low-temperature and low-pressure CO2 at the cold end of a supercritical CO2 coal-fired power generation system through an ejector for heating, waste heat at the cold end of the system can be recovered, cold source losses can be reduced, and the comprehensive energy utilization efficiency of the system can be improved. Different high-temperature and high-pressure CO2 sources can be selected according to the heating conditions to flexibly meet the needs of users for different heat loads. The ejector has no moving parts.

[0038] The structure is simple and the investment is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a supercritical CO2 cycle cogeneration system according to an embodiment of the present disclosure;

[0040] Figure 2 This is a flow chart of an operation method of a supercritical CO2 cycle cogeneration system according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] like Figure 1 As shown, the embodiment of the present disclosure provides a supercritical CO2 cycle cogeneration system, which includes a supercritical CO2 coal-fired power generation system and a heating system. The supercritical CO2 coal-fired power generation system includes a first-stage main compressor 1, a second-stage precooler 2, a second-stage main compressor 3, a low-temperature regenerator 4, a high-temperature regenerator 5, a boiler 6, a turbine 7, a high-temperature regenerator 5, a low-temperature regenerator 4 and a first-stage precooler 8 connected in sequence, and also includes a recompressor 9, and the inlet and outlet of the recompressor 9 are respectively connected to the hot side outlet of the low-temperature regenerator 4 and the cold side outlet of the low-temperature regenerator 4.

[0043] The heating system includes an ejector 10 and a heating network heater 11 .

[0044] The inlet of the first-stage precooler 8 is connected to the hot side outlet of the low-temperature regenerator 4 , and the outlet of the first-stage precooler 8 is connected to the inlet of the first-stage main compressor 1 .

[0045] The inlet of the second-stage precooler 2 is respectively connected to the outlet of the first-stage main compressor 1 and the low-pressure inlet of the ejector 10 , and the outlet of the second-stage precooler 2 is connected to the inlet of the second-stage main compressor 3 .

[0046] The outlet of the second-stage main compressor 3 is connected to the cold-side inlet of the low-temperature regenerator 4 .

[0047] The inlet of the turbine 7 is connected to the outlet of the boiler 6 , and the outlet of the turbine 7 is connected to the inlet of the high-temperature regenerator 5 .

[0048] The cold side outlet of the high temperature regenerator 5 is connected to the inlet of the boiler 6 .

[0049] The hot side outlet of the high-temperature regenerator 5 is connected to the hot side inlet of the low-temperature regenerator 4 .

[0050] The cold side outlet of the low-temperature regenerator 4 is connected to the cold side inlet of the high-temperature regenerator 5 .

[0051] Among them, the hot side outlet of the low-temperature regenerator 4 is connected to the low-pressure inlet of the ejector 10 to transport low-temperature and low-pressure CO2 to the ejector 10.

[0052] One of the outlet of the boiler 6 , the cold side outlet of the high temperature regenerator 5 and the cold side outlet of the low temperature regenerator 4 is selectively connected to the high pressure inlet of the ejector 10 to deliver high temperature and high pressure CO 2 to the ejector 10 .

[0053] The inlet of the heat network heater 11 is connected to the outlet of the ejector 10, and the outlet of the heat network heater 11 is respectively connected to the second stage precooler 2 of the supercritical CO2 coal-fired power generation system and the heating user.

[0054] The ejector 10 is used to mix the high-temperature and high-pressure CO2 with the low-temperature and low-pressure CO2 into medium-temperature and medium-pressure CO2 and then transport it to the heating network heater 11.

[0055] The supercritical CO2 working medium is compressed in two stages by the first-stage main compressor 1 and the second-stage main compressor 3, and the inter-stage pressure matches the CO2 pressure at the outlet of the heat network heater 11.

[0056] Specifically, according to the heating conditions, one of the outlet of the boiler 6, the cold side outlet of the high temperature regenerator 5, and the cold side outlet of the low temperature regenerator 4 is selectively connected to the high pressure inlet of the ejector 10 to deliver high temperature and high pressure CO to the ejector 10. 2。The hot side outlet of the low-temperature regenerator 4 is connected to the low-pressure inlet of the ejector 10 to deliver low-temperature and low-pressure CO2 to the ejector 10. The ejector 10 mixes the high-temperature and high-pressure CO2 with the low-temperature and low-pressure CO2 into medium-temperature and medium-pressure CO2 and then delivers it to the heat network heater 11 for heating. A part of the heated medium-temperature and medium-pressure CO2 is used for user heating, and the other part returns to the supercritical CO2 coal-fired power generation system to participate in the cycle.

[0057] The supercritical CO2 cycle cogeneration system of the disclosed embodiment uses an ejector to eject the low-temperature and low-pressure working fluid at the cold end of the system using the high-temperature and high-pressure working fluid. After mixing to form a medium-temperature and medium-pressure working fluid, the medium-temperature and medium-pressure working fluid is heated by the heat network heater to provide heating to the user, thereby achieving the purpose of efficient heating. In addition, a portion of the heated medium-temperature and medium-pressure working fluid re-participates in the circulation of the supercritical CO2 coal-fired power generation system to improve energy utilization efficiency. The system uses the ejection of low-temperature and low-pressure CO2 at the cold end of the supercritical CO2 coal-fired power generation system for heating, which can recover the waste heat at the cold end of the system, reduce the loss of the cold source, and improve the comprehensive energy utilization efficiency of the system; according to the heating conditions, high-temperature and high-pressure CO2 sources of different temperatures are selected to flexibly meet the needs of users for different heat loads; the ejector has no moving parts, a simple structure, and a small investment.

[0058] Exemplarily, at the beginning and end of heating, the cold side outlet of the low-temperature regenerator 4 is connected to the high-pressure inlet of the ejector 10.

[0059] In the middle of heating, one of the outlet of the boiler 6 or the cold side outlet of the high-temperature regenerator 5 is connected to the high-pressure inlet of the ejector 10 .

[0060] Specifically, at the beginning and end of heating, since the heating load demand is relatively small, the high-temperature and high-pressure CO2 used for injection can be a working fluid with a relatively low temperature at the cold side outlet of the low-temperature regenerator 4.

[0061] That is to say, at the beginning and end of heating, the cold side outlet of the low temperature regenerator 4 is connected to the high pressure inlet of the ejector 10, and the high temperature and high pressure CO is provided to the ejector 10 through the low temperature regenerator 4. 2。

[0062] In the middle period of heating, due to the large heating load demand, high temperature and high pressure CO2 can use a working fluid with a higher temperature at the cold side outlet of the high temperature regenerator 5, or a working fluid with a higher temperature at the outlet of the boiler 6.

[0063] That is to say, in the middle of heating, one of the outlet of the boiler 6 or the cold side outlet of the high temperature regenerator 5 is connected to the high pressure inlet of the ejector 10, and the high temperature and high pressure CO is provided to the ejector 10 through the boiler 6 or the high temperature regenerator 5. 2。

[0064] In this embodiment, high-temperature and high-pressure CO2 sources of different temperatures can be selected according to the heating conditions to flexibly meet the user's needs for different heat loads and further improve the comprehensive energy utilization efficiency of the system.

[0065] For example, Figure 1 As shown, the heating system further includes a first valve 14, which is disposed in the communication pipeline between the boiler 6 and the ejector 10. The first valve 14 can control the opening or closing of the communication pipeline between the boiler 6 and the ejector 10.

[0066] For example, Figure 1 As shown, the heating system further includes a second valve 13, which is disposed in the connecting pipeline between the high-temperature regenerator 5 and the ejector 10. The second valve 13 can control the opening or closing of the connecting pipeline between the high-temperature regenerator 5 and the ejector 10.

[0067] For example, Figure 1 As shown, the heating system further includes a third valve 12, which is disposed in the connecting pipeline between the low-temperature regenerator 4 and the ejector 10. The third valve 12 can control the opening or closing of the connecting pipeline between the low-temperature regenerator 4 and the ejector 10.

[0068] Specifically, when the boiler 6 is required to provide high-temperature and high-pressure CO2, the first valve 14 is opened, and the second valve 13 and the third valve 12 are closed. When the high-temperature and high-pressure CO2 is required from the high-temperature regenerator 5, the second valve 13 is opened, and the first valve 14 and the third valve 12 are closed. When the low-temperature and high-pressure CO2 is required from the low-temperature regenerator 4, the third valve 12 is opened, and the first valve 14 and the second valve 13 are closed.

[0069] In this embodiment, the high-temperature and high-pressure CO2 source used for injection can be flexibly switched and combined among the above three high-temperature and high-pressure CO2 sources by adjusting the first valve 14, the second valve 13 and the third valve 12 according to the size of the heat load.

[0070] like Figure 2 As shown, another aspect of the embodiment of the present disclosure provides an operation method S100 of a supercritical CO2 cycle cogeneration system, using the supercritical CO2 cycle cogeneration system described above. The specific structural features of the supercritical CO2 cycle cogeneration system have been described in detail above and will not be repeated here.

[0071] The operation method S100 of the supercritical CO2 cycle cogeneration system specifically includes:

[0072] S110. According to the heating conditions, one of the outlet of the boiler, the cold side outlet of the high-temperature regenerator and the cold side outlet of the low-temperature regenerator is selectively connected to the high-pressure inlet of the ejector to transport high-temperature and high-pressure CO2 to the ejector.

[0073] Specifically, at the beginning and end of heating, the cold side outlet of the low-temperature regenerator 4 is connected to the high-pressure inlet of the ejector 10, and the high-temperature and high-pressure CO2 of the low-temperature regenerator 4 is transported to the ejector 10.

[0074] In the middle stage of heating, one of the outlet of the boiler 6 or the cold side outlet of the high-temperature regenerator 5 is connected to the high-pressure inlet of the ejector 10, and the high-temperature and high-pressure CO2 of the boiler 6 or the high-temperature regenerator 5 is transported to the ejector 10.

[0075] S120, connecting the hot side outlet of the low-temperature regenerator with the low-pressure inlet of the ejector to transport low-temperature and low-pressure CO2 to the ejector.

[0076] Specifically, the hot side outlet of the low temperature regenerator 4 is connected to the low pressure inlet of the ejector 10 to deliver low temperature and low pressure CO2 to the ejector 10. That is, the low temperature and low pressure CO2 at the cold end of the supercritical CO2 coal-fired power generation system is ejected through the ejector 10.

[0077] S130, connecting the inlet of the heat network heater with the outlet of the ejector, and connecting the outlet of the heat network heater with the supercritical CO2 coal-fired power generation system and the heating user respectively; wherein, the high-temperature and high-pressure CO2 and the low-temperature and low-pressure CO2 are mixed into medium-temperature and medium-pressure CO2 through the ejector and then transported to the heat network heater.

[0078] Specifically, the ejector 10 mixes the high-temperature and high-pressure CO2 with the low-temperature and low-pressure CO2 into medium-temperature and medium-pressure CO2 and then transports it to the heat network heater 11 for heating. Part of the heated medium-temperature and medium-pressure CO2 is used for heating users, and the other part returns to the supercritical CO2 coal-fired power generation system to participate in the circulation.

[0079] The operating method of the supercritical CO2 cycle cogeneration system of the embodiment of the present disclosure can recycle the waste heat of the cold end of the system, reduce the loss of cold source, and improve the comprehensive energy utilization efficiency of the system by injecting low-temperature and low-pressure CO2 at the cold end of the supercritical CO2 coal-fired power generation system through an ejector for heating; different high-temperature and high-pressure CO2 sources can be selected according to the heating conditions to flexibly meet the user's needs for different heat loads; the ejector has no moving parts, a simple structure, and a small investment.

[0080] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A supercritical CO2 cycle cogeneration system, characterized in that: It includes a supercritical CO2 coal-fired power generation system and a heating system; the supercritical CO2 coal-fired power generation system includes a boiler, a high-temperature regenerator, a low-temperature regenerator and a second-stage precooler, and the heating system includes an ejector and a heat network heater; wherein, One of the outlet of the boiler, the cold side outlet of the high temperature regenerator and the cold side outlet of the low temperature regenerator is selectively connected to the high pressure inlet of the ejector to deliver high temperature and high pressure CO2 to the ejector; The hot side outlet of the low-temperature regenerator is connected to the low-pressure inlet of the ejector to transport low-temperature and low-pressure CO2 to the ejector; The inlet of the heat network heater is connected to the outlet of the ejector, and the outlet of the heat network heater is respectively connected to the supercritical CO2 coal-fired power generation system and the heating user; wherein, The ejector is used to mix the high-temperature and high-pressure CO2 and the low-temperature and low-pressure CO2 into medium-temperature and medium-pressure CO2 and then transport it to the heating network heater.

2. The system according to claim 1, characterized in that At the beginning and end of heating, the cold side outlet of the low temperature regenerator is connected to the high pressure inlet of the ejector; In the middle stage of heating, one of the outlet of the boiler or the cold side outlet of the high temperature regenerator is connected to the high pressure inlet of the ejector.

3. The system according to claim 1, characterized in that The heating system also includes a first valve; The first valve is arranged in the communication pipeline between the boiler and the ejector.

4. The system according to claim 1, characterized in that The heating system further comprises a second valve; The second valve is arranged in the connecting pipeline between the high-temperature regenerator and the ejector.

5. The system according to claim 1, characterized in that The heating system further comprises a third valve; The third valve is arranged in the connecting pipeline between the low-temperature regenerator and the ejector.

6. The system according to any one of claims 1 to 3, characterized in that: The supercritical CO2 coal-fired power generation system also includes a first-stage main compressor, a second-stage main compressor, a first-stage precooler and a second-stage precooler; The inlet of the first-stage precooler is connected to the hot side outlet of the low-temperature regenerator, and the outlet of the first-stage precooler is connected to the inlet of the first-stage main compressor; The inlet of the second-stage precooler is respectively connected to the outlet of the first-stage main compressor and the low-pressure inlet of the ejector, and the outlet of the second-stage precooler is connected to the inlet of the second-stage main compressor; The outlet of the second-stage main compressor is communicated with the cold-side inlet of the low-temperature regenerator.

7. The system according to any one of claims 1 to 3, characterized in that: The supercritical CO2 coal-fired power generation system also includes a recompressor; The inlet and outlet of the recompressor are respectively connected to the hot side outlet of the low-temperature regenerator and the cold side outlet of the low-temperature regenerator.

8. The system according to any one of claims 1 to 3, characterized in that: The supercritical CO2 coal-fired power generation system also includes a turbine; The inlet of the turbine is connected to the outlet of the boiler, and the outlet of the turbine is connected to the inlet of the high-temperature regenerator; The cold side outlet of the high temperature regenerator is connected to the inlet of the boiler; The hot side outlet of the high temperature regenerator is connected to the hot side inlet of the low temperature regenerator; The cold side outlet of the low temperature regenerator is communicated with the cold side inlet of the high temperature regenerator.

9. A method for operating a supercritical CO2 cycle cogeneration system, characterized in that: A supercritical CO2 cycle cogeneration system according to any one of claims 1 to 8 is used; the operation method comprises: According to the heating conditions, one of the outlet of the boiler, the cold side outlet of the high temperature regenerator and the cold side outlet of the low temperature regenerator is selectively connected to the high pressure inlet of the ejector to deliver high temperature and high pressure CO2 to the ejector; Connecting the hot side outlet of the low-temperature regenerator to the low-pressure inlet of the ejector to deliver low-temperature and low-pressure CO2 to the ejector; The inlet of the heat network heater is connected to the outlet of the ejector, and the outlet of the heat network heater is connected to the supercritical CO2 coal-fired power generation system and the heating user respectively; wherein, The high-temperature and high-pressure CO2 and the low-temperature and low-pressure CO2 are mixed into medium-temperature and medium-pressure CO2 through the ejector and then transported to the heating network heater.

10. The operating method according to claim 9, characterized in that: The operation method further comprises: At the beginning and end of heating, the cold side outlet of the low-temperature regenerator is connected to the high-pressure inlet of the ejector, and the high-temperature and high-pressure CO2 of the low-temperature regenerator is transported to the ejector; In the middle of heating, one of the outlet of the boiler or the cold side outlet of the high-temperature regenerator is connected to the high-pressure inlet of the ejector, and the high-temperature and high-pressure CO2 of the boiler or the high-temperature regenerator is transported to the ejector.

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