Waste heat recovery system for dead steam generated after work applying of steam-jet pump

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery system utilizing dead steam generated after a steam jet pump does work, which comprises an original steam jet system and a newly-built power generation system, and the original steam jet system is connected with the newly-built power generation system through a pipeline and a valve. The newly-built power generation system comprises a turbine, a power generator, an evaporator, a third condenser and a cooling source. According to the utility model, the waste heat of dead steam generated at the steam jet pump in the original steam jet system is recycled for power generation through the newly built power generation system, so that the originally wasted heat energy is effectively utilized, the energy consumption is reduced, the energy utilization efficiency is improved, and meanwhile, the control valve is additionally arranged at the three-stage pump in the original steam jet system, so that the energy utilization efficiency is improved. And the flow direction of steam connected to the original steam injection system or the newly-built power generation system is controlled, so that the newly-added newly-built power generation system does not affect normal production of the original process.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery system utilizing exhaust steam from a steam jet pump doing work. Background Art

[0002] Since the steam jet vacuum pump technology was applied in the magnesium industry, it has been quickly promoted in the magnesium industry for its advantages of easy use, easy maintenance, power saving, and fast vacuum establishment. At the same time, it has also received support and help from many experts, scholars and magnesium industry peers, and has put forward valuable suggestions and opinions for the gradual improvement of the steam jet vacuum system.

[0003] Steam jet vacuum pump is a vacuum equipment that uses steam as a power source. The working principle of steam jet vacuum pump is to use the low-pressure area generated by high-speed steam flow at the nozzle to suck in and mix the gas, and then discharge it at high speed, so as to achieve the purpose of suction and transportation of gas. The advantages of steam jet vacuum pump are large suction volume, fast suction speed, long service life, and no mechanical moving parts in steam jet vacuum pump, basically no wear, so long service life. However, the steam jet pump system also has the problem of high energy consumption, steam emptying and condensation will waste a lot of heat and water resources.

[0004] In order to improve the waste of large amounts of steam heat, the utility model uses the heat of the steam to build a new power generation system to recycle the wasted heat. Utility Model Content

[0005] To this end, the utility model provides a waste heat recovery system using the exhaust steam after the steam jet pump does work, so as to overcome the technical problems in the prior art of high energy consumption after the steam jet pump does work, and waste of heat and water resources caused by steam exhaustion and condensation.

[0006] To achieve the above-mentioned purpose, the utility model provides a waste heat recovery system using the exhaust steam after the steam jet pump does work, comprising an original steam jet system and a newly built power generation system, wherein the original steam jet system and the newly built power generation system are connected via pipelines and valves;

[0007] The original steam injection system comprises a primary pump, a secondary pump, a tertiary pump, a quaternary pump, a quintuple pump, a No. 1 condenser, a No. 2 condenser, a water collecting tank, a liquid collecting tank and a cooling tower which are sequentially connected through pipelines, and the original steam injection system also comprises a steam cylinder connected to a gas source, wherein the input ends of the primary pump, the secondary pump, the tertiary pump, the quaternary pump and the quintuple pump are respectively connected to the output ends of the steam cylinder through corresponding pipelines, and the output end of the primary pump is connected to the air suction port of the secondary pump, and the output end of the secondary pump is connected to the air suction port of the tertiary pump;

[0008] The newly built power generation system includes an evaporator, a turbine, a generator, a third condenser and a cooling source, wherein the shell side input end of the evaporator is connected to the output end of the three-stage pump through a pipeline;

[0009] The output end of the three-stage pump is provided with a steam extraction point, and the output end of the three-stage pump is respectively connected to the evaporator in the newly-built power generation system and the No. 1 condenser of the original steam injection system through corresponding valves and pipelines arranged at the steam extraction point.

[0010] Furthermore, the No. 1 condenser, the No. 2 condenser, the No. 3 condenser and the water collecting tank all include a gas input end and a gas output end for gas communication, and a liquid input end and a liquid output end for liquid circulation;

[0011] The cooling tower is connected to the liquid input ends of the No. 1 condenser, the No. 2 condenser and the water collecting tank through a water distribution cylinder, and the liquid output ends of the No. 1 condenser, the No. 2 condenser and the water collecting tank are connected to the liquid collecting tank through corresponding pipelines.

[0012] Furthermore, the gas input end of the No. 1 condenser is connected to the output end of the three-stage pump through a first control valve and a corresponding connecting pipe, and the gas output end of the No. 1 condenser is connected to the exhaust port of the four-stage pump.

[0013] Furthermore, the gas input end of the No. 2 condenser is connected to the output end of the four-stage pump, and the gas output end of the No. 2 condenser is connected to the exhaust port of the five-stage pump.

[0014] Furthermore, the gas input end of the water collecting tank is connected to the output end of the five-stage pump, and the gas output end of the water collecting tank is connected to the atmosphere.

[0015] Furthermore, the shell side output end of the evaporator is connected to the liquid collecting tank, and the shell side output end of the evaporator is connected to the output end of the three-stage pump through the second control valve and the corresponding connecting pipe;

[0016] The tube side input end of the evaporator is connected to the gas output end of the third condenser, and the tube side output end of the evaporator is connected to the air inlet end of the turbine.

[0017] Furthermore, the power output end of the turbine is connected to the input end of the generator through a rotating shaft, and the exhaust end of the turbine is connected to the gas input end of the third condenser;

[0018] The liquid input end and the liquid output end of the third condenser are connected to the cooling source through corresponding pipelines respectively.

[0019] Furthermore, the turbine in the newly built power generation system is a back-pressure steam turbine.

[0020] Furthermore, the generator in the newly built power generation system is a synchronous generator.

[0021] Furthermore, the first-stage pump, the second-stage pump, the third-stage pump, the fourth-stage pump and the fifth-stage pump are all steam jet vacuum pumps.

[0022] Compared with the prior art, the beneficial effect of the utility model lies in that the waste heat of the exhaust steam generated at the steam injection pump in the original steam injection system is recovered and used for power generation through the newly built power generation system, so as to effectively utilize the originally wasted heat energy, reduce energy consumption, and improve energy utilization efficiency. At the same time, by adding a control valve at the tertiary pump in the original steam injection system, the steam flow direction connected to the original steam injection system or the newly built power generation system is controlled, so that the newly added new power generation system will not affect the normal production of the original process.

[0023] Furthermore, without affecting the original process, the hot steam from the three-stage pump of the original steam injection system is used to enter the evaporator of the newly built power generation system to heat the working medium, and the generated clean steam enters the turbine to do work and drive the generator to generate electricity. The steam heat in the original steam injection system is recycled and utilized, thereby reducing electricity consumption, lowering production costs, and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the waste heat recovery system of the utility model;

[0025] Figure 2 It is a schematic diagram of the structure of the original steam injection system 100 and the newly built power generation system 200 of the utility model;

[0026] Figure 3 Schematic diagram of the working principle of the original steam injection system 100.

[0027] In the figure: 100-original steam injection system, 10-steam cylinder, 11-primary pump, 12-secondary pump, 13-third-stage pump, 14-fourth-stage pump, 15-fifth-stage pump, 16-No. 1 condenser, 17-No. 2 condenser, 18-water collection tank, 19-liquid collection tank, 200-new power generation system, 21-evaporator, 22-turbine, 23-generator, 24-No. 3 condenser, 25-cooling source. DETAILED DESCRIPTION

[0028] In order to make the purpose and advantages of the utility model more clearly understood, the utility model is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0029] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0030] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0032] See also Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, Figure 1 The overall structural diagram of the waste heat recovery system of the utility model is shown in FIG. Figure 2 It is a schematic diagram of the structure of the original steam injection system 100 and the newly built power generation system 200 of the utility model;

[0033] Specifically, the embodiment of the present application provides a waste heat recovery system using exhaust steam after a steam jet pump performs work, including an original steam jet system 100 and a newly built power generation system 200, wherein the original steam jet system 100 and the newly built power generation system 200 are connected via pipelines and valves;

[0034] The original steam injection system 100 includes a primary pump 11, a secondary pump 12, a tertiary pump 13, a quaternary pump 14, a quintuple pump 15, a No. 1 condenser 16, a No. 2 condenser 17, a water collecting tank 18, a liquid collecting tank 19 and a cooling tower which are sequentially connected through pipelines. The original steam injection system 100 also includes a steam cylinder 10 connected to a gas source, wherein the input ends of the primary pump 11, the secondary pump 12, the tertiary pump 13, the quaternary pump 14 and the quintuple pump 15 are respectively connected to the output end of the steam cylinder 10 through corresponding pipelines, and the output end of the primary pump 11 is connected to the air suction port of the secondary pump 12, and the output end of the secondary pump 12 is connected to the air suction port of the tertiary pump 13;

[0035] The newly built power generation system 200 includes an evaporator 21, a turbine 22, a generator 23, a third condenser 24 and a cooling source 25, wherein the shell side input end of the evaporator 21 is connected to the output end of the third-stage pump 13 through a pipeline;

[0036] The output end of the three-stage pump 13 is provided with a steam extraction point, and the output end of the three-stage pump 13 is connected to the evaporator 21 in the newly-built power generation system 200 and the No. 1 condenser 16 of the original steam injection system 100 through corresponding valves and pipelines arranged at the steam extraction point.

[0037] The waste heat of exhaust steam generated by the steam injection pump in the original steam injection system 100 is recovered and used for power generation through the newly built power generation system 200, so as to effectively utilize the heat energy that was originally wasted, reduce energy consumption, and improve energy utilization efficiency. At the same time, by adding a control valve at the tertiary pump 13 in the original steam injection system 100, the flow direction of steam connected to the original steam injection system 100 or the newly built power generation system 200 is controlled, so that the newly added newly built power generation system 200 will not affect the normal production of the original process;

[0038] Furthermore, without affecting the original process, the hot steam at the tertiary pump 13 of the original steam injection system 100 is used to enter the evaporator 21 of the newly built power generation system 200 to heat the working medium, and the generated clean steam enters the turbine 22 to do work and drive the generator 23 to generate electricity, so that the steam heat in the original steam injection system 100 is recovered and utilized, thereby reducing electricity consumption, lowering production costs, and improving economic benefits.

[0039] Specifically, the first condenser 16, the second condenser 17, the third condenser 24 and the water collecting tank 18 all include a gas input end and a gas output end for gas communication, and a liquid input end and a liquid output end for liquid circulation;

[0040] The cooling tower is connected to the liquid input ends of the No. 1 condenser 16, the No. 2 condenser 17 and the water collecting tank 18 through a water distribution cylinder, and the liquid output ends of the No. 1 condenser 16, the No. 2 condenser 17 and the water collecting tank 18 are connected to the liquid collecting tank 19 through corresponding pipelines.

[0041] Water pumps for liquid transportation are provided between the liquid collecting tank 19 and the cooling tower, and between the cooling tower and the water distribution cylinder, so that the coolant therein forms a circulation.

[0042] Specifically, the gas input end of the first condenser 16 is connected to the output end of the third-stage pump 13 through the first control valve 31 and the corresponding connecting pipe, and the gas output end of the first condenser 16 is connected to the exhaust port of the fourth-stage pump 14.

[0043] Specifically, the gas input end of the second condenser 17 is connected to the output end of the fourth-stage pump 14 , and the gas output end of the second condenser 17 is connected to the gas extraction port of the fifth-stage pump 15 .

[0044] In the original steam injection system 100, after the mixed gas mixed by the three-stage pump 13 is double condensed by the first condenser 16 and the second condenser 17 arranged in sequence, the steam in the mixed gas is condensed and the heat carried by it is absorbed.

[0045] Specifically, the gas input end of the water collecting tank 18 is connected to the output end of the five-stage pump 15, and the gas output end of the water collecting tank 18 is connected to the atmosphere.

[0046] Please continue reading Figure 3 ,like Figure 3 As shown, it is a schematic diagram of the working principle of the original steam injection system 100;

[0047] Specifically, the working process of the original steam injection system 100 is:

[0048] The working steam G1 of the primary pump 11 extracts and mixes the gas W generated in the reduction process to form a mixed gas T1. Since the output end of the primary pump 11 is connected to the suction port of the secondary pump 12, the secondary pump 12 extracts T1 through the working steam G2 to form a mixed gas T2. Similarly, the tertiary pump 13 extracts T2 through the working steam G3 to form a mixed gas T3. The mixed gas T3 discharged from the output end of the tertiary pump 13 enters the first condenser 16 for condensation. Under the coordinated cooling of the cooling tower and the condensed water, most of the steam carried in the mixed gas T3 The gas T4 discharged from the four-stage pump 14 enters the second condenser 17 for re-condensation. After condensation, the remaining gas is again pumped away by the five-stage pump 15. The mixed gas T5 discharged from the five-stage pump 15 enters the water collecting tank 18 for final condensation. Most of the steam is condensed into water and recovered through the liquid collecting tank 19 to supply water to the cooling tower to form a circulation. The non-condensable gas and the remaining small amount of steam are discharged into the atmosphere from the water collecting tank 18 to complete the condensation.

[0049] Specifically, the shell side output end of the evaporator 21 is connected to the liquid collecting tank 19, and the shell side output end of the evaporator 21 is connected to the output end of the tertiary pump 13 through the second control valve 32 and the corresponding connecting pipe;

[0050] The tube side input end of the evaporator 21 is connected to the gas output end of the third condenser, and the tube side output end of the evaporator 21 is connected to the air inlet end of the turbine 22 .

[0051] A corresponding driving pump can be arranged between the third condenser and the evaporator 21 to assist the circulation of the working medium, and by connecting the shell side output end of the evaporator 21 to the liquid collecting tank 19 in the original steam injection system 100, the mixed steam after completing the heat exchange in the evaporator 21 can enter the liquid collecting tank 19 of the original steam injection system 100 for storage after condensing into liquid water.

[0052] Specifically, the power output end of the turbine 22 is connected to the input end of the generator 23 through a rotating shaft, and the exhaust end of the turbine 22 is connected to the gas input end of the third condenser 24;

[0053] The liquid input end and the liquid output end of the third condenser 24 are connected to the cooling source 25 through corresponding pipelines respectively.

[0054] So that a circulation is formed between the cooling source 25 and the third condenser 24 in the newly built power generation system 200, the working fluid discharged from the turbine 22 is condensed and cooled, and then transported to the evaporator 21 for the next circulation;

[0055] A corresponding driving pump may be provided between the third condenser 24 and the evaporator 21 to promote circulation.

[0056] like Figure 2 As shown in the figure, the working process of the waste heat recovery system is as follows:

[0057] By adding a steam extraction point at the third-stage steam injection pump of the original steam injection system 100, that is, the tertiary pump 13, when it is necessary to recover the waste heat, the first control valve 31 leading to the subsequent cooling facility in the original steam injection system 100 is closed, and the second control valve 32 is opened so that the mixed gas discharged from the tertiary pump 13 can enter the evaporator 21 in the newly built power generation system 200, allowing the hot exhaust steam to flow through the shell side of the evaporator 21. At the same time, the working medium enters the tube side of the evaporator 21 under the action of the corresponding driving pump. At this time, the hot steam will heat the working medium to generate clean steam, which enters the turbine 22 to complete work and drive the generator 23 to generate electricity. The liquid water condensed by the hot exhaust steam from the tertiary pump 13 after completing the heat exchange will enter the liquid collecting pool 19 of the original steam injection system 100. The exhaust steam of the clean steam after completing the work in the turbine 22 enters the No. 3 condenser 24 to be condensed into liquid or recycled after appropriate cooling. The newly built power generation system 200 can fully utilize the steam heat wasted by the original steam injection system 100, thereby improving the waste heat utilization rate.

[0058] Specifically, the turbine 22 in the newly built power generation system 200 is a back-pressure steam turbine 22 .

[0059] In this embodiment, since the fluid flowing through the turbine 22 is steam, a steam turbine 22 is selected as the prerequisite for the type of turbine 22 required. Since the back-pressure turbine is usually simple in structure, low in cost, and easy to operate and maintain, if the system used for power generation is small in scale and does not require high-efficiency power production, a back-pressure turbine can be selected to reduce the cost of power generation and subsequent maintenance. Therefore, the back-pressure turbine is selected as the subsequent selection type in this application.

[0060] Specifically, the generator 23 in the newly built power generation system 200 is a synchronous generator.

[0061] The synchronous motor is a type of AC generator that can keep its rotation speed synchronized with the frequency of the power grid. By connecting the input end of the synchronous motor to the rotating shaft of the turbine 22, the turbine 22 drives the synchronous motor to generate AC power when it rotates, and the generated AC power is boosted by the transformer and sent to the power grid for production.

[0062] The reason why a synchronous motor is used as the generator 23 in this embodiment is that it can maintain the stability of the grid frequency when the load changes, and can also provide reactive power to help maintain the voltage stability of the grid. In large power stations, these characteristics of the synchronous motor are crucial to the stable operation of the grid.

[0063] Specifically, the primary pump 11, the secondary pump 12, the tertiary pump 13, the quaternary pump 14 and the quintuple pump 15 are all steam jet vacuum pumps.

[0064] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

[0065] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A waste heat recovery system using the exhaust steam from a steam jet pump, characterized in that: It includes an original steam injection system (100) and a newly built power generation system (200), wherein the original steam injection system (100) and the newly built power generation system (200) are connected via pipelines and valves; The original steam injection system (100) comprises a primary pump (11), a secondary pump (12), a tertiary pump (13), a quaternary pump (14), a quintuple pump (15), a No. 1 condenser (16), a No. 2 condenser (17), a water collecting tank (18), a liquid collecting tank (19) and a cooling tower which are sequentially connected via pipelines. The original steam injection system (100) further comprises a steam cylinder (10) connected to a gas source, wherein the input ends of the primary pump (11), the secondary pump (12), the tertiary pump (13), the quaternary pump (14) and the quintuple pump (15) are respectively connected to the output end of the steam cylinder (10) via corresponding pipelines, and the output end of the primary pump (11) is connected to the air suction port of the secondary pump (12), and the output end of the secondary pump (12) is connected to the air suction port of the tertiary pump (13); The newly built power generation system (200) comprises an evaporator (21), a turbine (22), a generator (23), a third condenser (24) and a cooling source (25), wherein the shell side input end of the evaporator (21) is connected to the output end of the third-stage pump (13) through a pipeline; The output end of the three-stage pump (13) is provided with a steam extraction point, and the output end of the three-stage pump (13) is respectively connected to the evaporator (21) in the newly-built power generation system (200) and the first condenser (16) of the original steam injection system (100) through corresponding valves and pipelines arranged at the steam extraction point.

2. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 1 is characterized in that: The first condenser (16), the second condenser (17), the third condenser (24) and the water collecting tank (18) all include a gas input end and a gas output end for gas communication, and a liquid input end and a liquid output end for liquid circulation; The cooling tower is connected to the liquid input ends of the No. 1 condenser (16), the No. 2 condenser (17) and the water collecting tank (18) respectively through a water distribution cylinder, and the liquid output ends of the No. 1 condenser (16), the No. 2 condenser (17) and the water collecting tank (18) are connected to the liquid collecting tank (19) respectively through corresponding pipelines.

3. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 2 is characterized in that: The gas input end of the first condenser (16) is connected to the output end of the third-stage pump (13) through the first control valve (31) and the corresponding connecting pipe, and the gas output end of the first condenser (16) is connected to the exhaust port of the fourth-stage pump (14).

4. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 3 is characterized in that: The gas input end of the second condenser (17) is connected to the output end of the fourth-stage pump (14), and the gas output end of the second condenser (17) is connected to the gas suction port of the fifth-stage pump (15).

5. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 4 is characterized in that: The gas input end of the water collecting tank (18) is connected to the output end of the five-stage pump (15), and the gas output end of the water collecting tank (18) is connected to the atmosphere.

6. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 5 is characterized in that: The shell side output end of the evaporator (21) is connected to the liquid collecting tank (19), and the shell side output end of the evaporator (21) is connected to the output end of the tertiary pump (13) through a second control valve (32) and a corresponding connecting pipe; The tube side input end of the evaporator (21) is connected to the gas output end of the third condenser, and the tube side output end of the evaporator (21) is connected to the gas inlet end of the turbine (22).

7. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 6 is characterized in that: The power output end of the turbine (22) is connected to the input end of the generator (23) through a rotating shaft, and the exhaust end of the turbine (22) is connected to the gas input end of the third condenser (24); The liquid input end and the liquid output end of the third condenser (24) are respectively connected to the cooling source (25) through corresponding pipelines.

8. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 1 is characterized in that: The turbine (22) in the newly built power generation system (200) is a back-pressure steam turbine.

9. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 1 is characterized in that: The generator (23) in the newly built power generation system (200) is a synchronous generator.

10. The waste heat recovery system using the exhaust steam from the steam jet pump according to claim 9, characterized in that: The first-stage pump (11), the second-stage pump (12), the third-stage pump (13), the fourth-stage pump (14) and the fifth-stage pump (15) are all steam jet vacuum pumps.

Images