Vacuum-pumping jet pump exhaust gas waste heat power generation system

Abstract

The utility model discloses a vacuumizing jet pump waste gas waste heat power generation system which comprises a separation tank, an ORC expansion generator, a heat exchange assembly, a condenser and a working medium pump. The ORC expansion generator is connected with the condenser through a first working medium pipeline, the condenser is connected with the heat exchange assembly through a second working medium pipeline, the working medium pump is arranged on the second working medium pipeline, and the heat exchange assembly is connected with the ORC expansion generator through a third working medium pipeline. High-temperature waste gas of the injection pump enters the heat exchange assembly through a first connecting pipeline, the heat exchange assembly is connected with an inlet of the separation tank through a second connecting pipeline, and an injection outlet of the separation tank is connected with an injection opening in the first connecting pipeline through an injection pipeline. The system has the advantages that waste gas generated by the vacuumizing injection pump can be comprehensively recycled, waste heat in the waste gas is effectively recycled and converted into clean electric energy, loss is reduced, the derived waste gas treatment cost is reduced, and the system reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat power generation, in particular to a waste heat power generation system of a vacuum jet pump exhaust gas. Background Art

[0002] The vacuum jet pump is used to maintain the vacuum degree of the system. In industrial applications, the exhaust gas temperature of the vacuum jet pump is relatively high (up to more than 400 degrees Celsius). This type of exhaust gas has low pressure, high temperature, and large temperature fluctuations. It has high requirements for the design and materials of its heat exchange equipment, resulting in high waste heat recovery costs. Direct exhaust gas discharge will lead to a large waste of heat and cause air pollution. Utility Model Content

[0003] The purpose of the utility model is to provide a waste heat power generation system of a vacuum jet pump exhaust gas, so as to solve the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A waste heat power generation system for waste gas from a vacuum jet pump comprises a separation tank, an ORC expansion generator, a heat exchange component, a condenser and a working fluid pump; the ORC expansion generator is connected to the condenser via a first working fluid pipeline, the condenser is connected to the heat exchange component via a second working fluid pipeline, the working fluid pump is arranged on the second working fluid pipeline, and the heat exchange component is connected to the ORC expansion generator via a third working fluid pipeline; high-temperature waste gas from the jet pump enters the heat exchange component via a first connecting pipeline, the heat exchange component is connected to the inlet of the separation tank via a second connecting pipeline, and the injection liquid outlet of the separation tank is connected to the injection port on the first connecting pipeline via an injection liquid pipeline.

[0006] Preferably, an organic unit air intake valve is provided on the first connecting pipeline, and the organic unit air intake valve is located downstream of the injection port along the gas flow direction inside the first connecting pipeline.

[0007] Preferably, the first connecting pipe is connected to a bypass pipe, and the bypass pipe is provided with a bypass valve; the connection point between the bypass pipe and the first connecting pipe is located between the air intake valve and the injection port of the unit.

[0008] Preferably, an injection pump is provided on the injection liquid pipeline.

[0009] Preferably, the condensate discharge port of the separation tank is connected to a condensate discharge pipeline, and a condensate pump is provided on the condensate discharge pipeline.

[0010] Preferably, the non-condensable gas discharge port of the separation tank is connected to a non-condensable gas discharge pipeline.

[0011] Preferably, the heat exchange component includes an evaporator and a preheater, the evaporator is connected to the preheater via a fourth working fluid pipeline and a third connecting pipeline; the high-temperature exhaust gas from the jet pump enters the evaporator via the first connecting pipeline, and the evaporator is connected to the ORC expansion generator via the third working fluid pipeline; the preheater is connected to the condenser and the separation tank via the second working fluid pipeline and the second connecting pipeline, respectively.

[0012] Preferably, a cooling water inlet pipe and a cooling water outlet pipe are connected to the water inlet and the water outlet of the condenser respectively.

[0013] The beneficial effects of the utility model are: 1. It can comprehensively recycle the waste gas generated by the vacuum jet pump, effectively recycle the waste heat in the waste gas and convert it into clean electric energy, reduce losses and the derived waste gas treatment costs, and improve system reliability. 2. Part of the low-temperature condensate is mixed with the high-temperature waste gas through the injection pump, reducing the design and material requirements of subsequent process equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the waste heat power generation system in the embodiment of the utility model.

[0015] In the figure: 1-working fluid pump; 2-preheater; 3-evaporator; 4-ORC expansion generator; 5-condenser; 6-separation tank; 7-condensate pump; 8-injection pump; 9-bypass valve; 10-unit air intake valve; 11-jet pump high-temperature exhaust gas; 12-injection port; 13-non-condensable gas outlet; 14-cooling water. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0017] like Figure 1 As shown, in this embodiment, a vacuum jet pump exhaust gas waste heat power generation system is provided, including a separation tank 6, an ORC expansion generator 4, a heat exchange component, a condenser 5 and a working fluid pump 1; the ORC expansion generator 4 is connected to the condenser 5 via a first working fluid pipeline, the condenser 5 is connected to the heat exchange component via a second working fluid pipeline, the working fluid pump 1 is arranged on the second working fluid pipeline, and the heat exchange component is connected to the ORC expansion generator 4 via a third working fluid pipeline; the jet pump high-temperature exhaust gas 11 enters the heat exchange component via the first connecting pipeline, the heat exchange component is connected to the inlet of the separation tank 6 via the second connecting pipeline, and the injection liquid outlet of the separation tank 6 is connected to the injection port 12 on the first connecting pipeline via the injection liquid pipeline.

[0018] In this embodiment, the ORC generator set includes an ORC expansion generator 4, a working fluid pump 1, a heat exchange component, a condenser 5, an organic working fluid and related working fluid pipelines.

[0019] Among them, the heat exchange component includes an evaporator 3 and a preheater 2, the evaporator 3 is connected to the preheater 2 via a fourth working fluid pipeline and a third connecting pipeline; the jet pump high-temperature exhaust gas 11 enters the evaporator 3 via the first connecting pipeline, and the evaporator 3 is connected to the ORC expansion generator 4 via the third working fluid pipeline; the preheater 2 is connected to the condenser 5 and the separation tank 6 via the second working fluid pipeline and the second connecting pipeline respectively.

[0020] The water inlet and the water outlet of the condenser 5 are respectively connected with a cooling water inlet pipe and a cooling water outlet pipe.

[0021] In this embodiment, the separation tank 6 has one inlet and three outlets, the three outlets are respectively a non-condensable gas outlet 13, a condensate outlet and an injection outlet, the non-condensable gas outlet 13 is connected to a non-condensable gas outlet pipeline, the condensate outlet is connected to a condensate outlet pipeline, the injection outlet is connected to an injection pipeline, and the injection pipeline is connected to the first connecting pipeline via the injection port 12. A condensate pump 7 is provided on the condensate outlet pipeline, and an injection pump 8 is provided on the injection pipeline.

[0022] The low-temperature condensate and non-condensable gas leaving the ORC generator set enter the separator 6 through the inlet of the separator 6. The non-condensable gas and low-temperature condensate entering the separator 6 are separated in the separator 6. The non-condensable gas enters the non-condensable gas discharge pipeline through the non-condensable gas discharge port 13 and is then discharged from the separator 6. A small portion of the low-temperature condensate enters the injection liquid pipeline through the injection liquid outlet of the separator 6. Driven by the injection pump 8, it enters the first connecting pipeline again and mixes with the high-temperature exhaust gas to become low-temperature saturated steam and enter the ORC generator set again to achieve circulation. Most of the condensate in the separator 6 is discharged from the separator 6 through the condensate discharge port and the condensate discharge pipeline and enters the lower process.

[0023] In this embodiment, an organic unit air intake valve 10 is disposed on the first connecting pipeline, and the organic unit air intake valve 10 is located downstream of the injection port 12 along the gas flow direction inside the first connecting pipeline.

[0024] The first connecting pipe is connected to a bypass pipe, and a bypass valve 9 is arranged on the bypass pipe; the connection point between the bypass pipe and the first connecting pipe is located between the unit air intake valve 10 and the injection port 12. The bypass valve 9 is used for bypassing the heat source during abnormal operation.

[0025] In this embodiment, the working principle of the waste heat power generation system is as follows: the injection pump 8 drives a small amount of condensate to mix with the high-temperature exhaust gas 11 of the jet pump through the injection port 12 to become low-temperature saturated steam. The saturated steam passes through the evaporator 3 and preheater 2 of the ORC generator set, condenses into liquid, and then enters the separation tank 6.

[0026] In the separation tank 6, the non-condensable gas is sent to the next process through the non-condensable gas outlet 13; the condensate is sent to the next process through the condensate pump 7; a small part of the condensate is sent by the injection pump 8 to mix with the high-temperature exhaust gas 11 of the jet pump.

[0027] In the ORC generator set, the liquid organic working fluid is driven by the working fluid pump 1, passes through the preheater 2 and the evaporator 3 successively, becomes a gaseous working fluid, enters the ORC expansion generator 4 to perform work and supply power to the outside, and then enters the condenser 5, condenses into liquid organic working fluid, and returns to the working fluid pump 1, completing the thermal cycle of the organic working fluid.

[0028] The cooling water 14 cools the organic working medium in the condenser 5 .

[0029] During abnormal operation, the bypass valve 9 is opened and the unit intake valve 10 is closed. The high-temperature exhaust gas 11 of the jet pump is sent to the bypass process through the bypass valve 9.

[0030] By adopting the above technical solution disclosed in the utility model, the following beneficial effects are obtained:

[0031] The utility model provides a waste heat power generation system for waste gas from a vacuum jet pump, which can comprehensively recycle the waste gas generated by the vacuum jet pump, effectively recycle the waste heat in the waste gas and convert it into clean electricity, reduce losses and the derived waste gas treatment costs, and improve system reliability. Part of the low-temperature condensate is mixed with the high-temperature waste gas through the injection pump, reducing the design and material requirements of subsequent process equipment.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A vacuum jet pump exhaust gas waste heat power generation system, characterized by: It includes a separation tank, an ORC expansion generator, a heat exchange component, a condenser and a working fluid pump; the ORC expansion generator is connected to the condenser via a first working fluid pipeline, the condenser is connected to the heat exchange component via a second working fluid pipeline, the working fluid pump is arranged on the second working fluid pipeline, and the heat exchange component is connected to the ORC expansion generator via a third working fluid pipeline; the high-temperature exhaust gas of the jet pump enters the heat exchange component via a first connecting pipeline, the heat exchange component is connected to the inlet of the separation tank via a second connecting pipeline, and the injection liquid outlet of the separation tank is connected to the injection port on the first connecting pipeline via an injection liquid pipeline.

2. The vacuum jet pump exhaust gas waste heat power generation system according to claim 1, characterized in that: An organic unit air intake valve is provided on the first connecting pipe, and the organic unit air intake valve is located downstream of the injection port along the gas flow direction in the first connecting pipe.

3. The waste heat power generation system using waste gas from a vacuum jet pump according to claim 2 is characterized in that: The first connecting pipe is connected to a bypass pipe, and a bypass valve is provided on the bypass pipe; the connection point between the bypass pipe and the first connecting pipe is located between the air inlet valve and the injection port of the unit.

4. The waste heat power generation system using waste gas from a vacuum jet pump according to claim 1, characterized in that: The injection liquid pipeline is provided with an injection pump.

5. The waste heat power generation system using waste gas from a vacuum jet pump according to claim 1 is characterized in that: The condensate discharge port of the separation tank is connected to a condensate discharge pipe, and a condensate pump is provided on the condensate discharge pipe.

6. The waste heat power generation system using waste gas from a vacuum jet pump according to claim 1, characterized in that: The non-condensable gas discharge outlet of the separation tank is connected with a non-condensable gas discharge pipe.

7. The waste heat power generation system of the vacuum jet pump exhaust gas according to any one of claims 1 to 6, characterized in that: The heat exchange component includes an evaporator and a preheater. The evaporator is connected to the preheater via a fourth working fluid pipeline and a third connecting pipeline. The high-temperature exhaust gas from the jet pump enters the evaporator via the first connecting pipeline. The evaporator is connected to the ORC expansion generator via the third working fluid pipeline. The preheater is connected to the condenser and the separation tank via the second working fluid pipeline and the second connecting pipeline, respectively.

8. The waste heat power generation system of the vacuum jet pump exhaust gas according to any one of claims 1 to 6, characterized in that: The water inlet and the water outlet of the condenser are respectively connected with a cooling water inlet pipe and a cooling water outlet pipe.

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