System for preventing water from entering air side of steam turbine vacuum pump

Abstract

The invention discloses a system for preventing water from entering the air side of a vacuum pump of a steam turbine. The inlet end of the gas side of the vacuum pump side is connected with the condenser; the pipeline part is used for communicating the condenser with the vacuum pump side; by adding the condensate water collecting area, the risk that water is carried on the air side is removed, the vacuumizing capacity of the vacuum pump is greatly improved, one vacuum pump is used for transportation and one vacuum pump is used for standby, the safe operation reliability of the vacuum system is improved, the situation that two vacuum pumps need to be started under the extreme operation condition is reduced, and then the power consumption of a plant can be reduced, energy is saved, and environment friendliness is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pumps, and in particular to a system for preventing water from entering the gas side of a steam turbine vacuum pump. Background Art

[0002] The gas side suction port of the vacuum pump of the original system is directly connected to the vacuum pump (2) from the condenser (1). The gas side suction port of the vacuum pump of the original system is arranged horizontally, and there is water entrainment, which causes the vacuum pump inlet pipe (3) to become narrower (gas blockage occurs), and the amount of non-condensable gas air drawn in is reduced, resulting in a decrease in the vacuum pump's vacuum pumping capacity and the unit's vacuum decrease, which seriously affects the economy of the turbine. If the water in the inlet pipe (3) accumulates seriously, two vacuum pumps (2) need to be started to maintain the safe operation of the unit, but this will increase the power consumption of the plant. Summary of the invention

[0003] In view of the above-mentioned problems existing in the existing system for preventing water from entering the gas side of a steam turbine vacuum pump, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide a system for preventing water from entering the gas side of a steam turbine vacuum pump.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0006] Condenser;

[0007] The inlet end of the gas side of the vacuum pump is connected to the condenser;

[0008] A pipeline portion is used to connect the condenser with the vacuum pump side.

[0009] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump of the present invention, wherein: the vacuum pump side includes a first vacuum pump and a second vacuum pump;

[0010] Wherein, a group of the condensers are connected to the first vacuum pump and the second vacuum pump respectively.

[0011] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, the condenser is connected to a collecting pipe, and the collecting pipe can collect condensed water from the condenser.

[0012] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, the pipeline portion includes a connecting pipe, and the connecting pipe is used to connect the condenser and the collecting pipe.

[0013] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, an upper curved pipe is provided between the collecting pipe and the first vacuum pump and the second vacuum pump.

[0014] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, a shunt pipe is provided between the collecting pipe and the two groups of upper curved pipes.

[0015] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, long tubes are provided between the two groups of upper curved pipes and the first vacuum pump and the second vacuum pump.

[0016] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, a decondensation pit is connected to the bottom of the collecting pipe, and an automatic drain valve is installed at the front end of the decondensation pit.

[0017] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, the collecting pipe is provided with a high liquid level detection point and a low liquid level detection point.

[0018] As a preferred solution of the system for preventing water from entering the gas side of a steam turbine vacuum pump according to the present invention, the automatic drain valve can automatically drain water according to the liquid level in the collecting pipe.

[0019] The beneficial effects of the present invention are as follows: by increasing the condensate collection area, the risk of water on the gas side can be eliminated, the vacuum pumping capacity of the vacuum pump can be greatly improved, and one vacuum pump can be operated and one vacuum pump can be on standby, thereby improving the safe operation reliability of the vacuum system and reducing the need to start two vacuum pumps under extreme operating conditions, thereby reducing factory electricity consumption and saving energy and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of an existing vacuum pump system.

[0022] Figure 2 It is a schematic diagram of the overall structure of the vacuum pump in the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Example 1

[0028] Reference Figure 2 , a system for preventing water ingress to the gas side of a steam turbine vacuum pump is provided, comprising, a condenser 100;

[0029] The inlet end of the gas side of the vacuum pump 200 is connected to the condenser 100;

[0030] A pipeline portion 300 for connecting the condenser 100 and the vacuum pump side 200;

[0031] The function of the condenser 100 is to condense the steam discharged from the steam turbine into water, thereby reducing its pressure and temperature and increasing the vacuum degree of the system. The increase in vacuum degree can reduce the volume of steam, allowing the steam turbine to operate under a lower back pressure, which can reduce steam consumption and improve thermal efficiency.

[0032] The vacuum pump side 200 is connected to the condenser 100 through the pipeline portion 300, so that the vacuum pump helps maintain the required vacuum degree and prevents uncondensed steam and air from leaking into the condenser 100, thereby maintaining the efficient operation of the condenser 100.

[0033] Further, the vacuum pump side 200 includes a first vacuum pump 201 and a second vacuum pump 202; wherein a set of condensers 100 are connected to the first vacuum pump 201 and the second vacuum pump 202 respectively;

[0034] By setting up two groups of vacuum pumps, the staff can flexibly select the vacuum pump according to the on-site needs, such as starting one at a time, or starting both groups of vacuum pumps at the same time. When one group of vacuum pumps fails, the other group of vacuum pumps can be started to ensure the smooth operation of the system.

[0035] Furthermore, the condenser 100 is connected to a collecting pipe 400, and the collecting pipe 400 can collect condensed water of the condenser 100;

[0036] In this embodiment, the collecting pipe 400 is preferably a U-shaped tube. When the gas in the condenser 100 passes through the collecting pipe 400, the collecting pipe 400 slows down the flow rate of the gas, forming a condensate collection area in front of the vacuum pump suction port, thereby reducing the condensate entering the vacuum pump, thereby enhancing the operating reliability of the vacuum system, reducing the occurrence of extreme situations, and greatly reducing the possibility of two sets of vacuum pumps being turned on at the same time. Adding a vacuum pump (50kw) consumes approximately 50*4500=225,000 kWh of electricity per year. The operation of one less vacuum pump can reduce electricity consumption, thereby achieving the effect of saving energy.

[0037] Preferably, the height and diameter of the U-shaped tube need to be determined according to the actual amount of condensed water and the working requirements of the vacuum pump.

[0038] Furthermore, the pipeline part 300 includes a connecting pipe 301, and the connecting pipe 301 is used to connect the condenser 100 and the collecting pipe 400. The connecting pipe 301 connects the end of the condenser 100 with the collecting pipe 400 to ensure that the condensed water can be collected.

[0039] By increasing the condensate collection area, the risk of water on the gas side can be eliminated, and the vacuum pump's vacuuming capacity can be greatly improved. It can be achieved that one vacuum pump is in operation and one is in standby, which improves the safe operation reliability of the vacuum system and reduces the need to start two vacuum pumps in extreme operating conditions, thereby reducing the factory's electricity consumption and saving energy and protecting the environment.

[0040] Example 2

[0041] Reference Figure 2 This embodiment is different from the first embodiment in that an upper curved pipe 600 is provided between the collecting pipe 400 and the first vacuum pump 201 and the second vacuum pump 202;

[0042] A flow divider 302 is provided between the collecting pipe 400 and the two sets of upper curved pipes 600;

[0043] Long tubes 303 are provided between the two sets of upper curved tubes 600 and the first vacuum pump 201 and the second vacuum pump 202 .

[0044] The end of the collecting pipe 400 away from the condenser 100 is connected to two sets of upper curved pipes 600 through the shunt pipe 302, and the other ends of the two sets of upper curved pipes 600 are respectively connected to a set of long pipes 303, and the ends of the two sets of long pipes 303 are respectively connected to the first vacuum pump 201 and the second vacuum pump 202;

[0045] The upper curved pipe 600 is designed to guide the non-condensable gas to smoothly enter the vacuum pump. After the non-condensable gas comes out of the collecting pipe 400, it passes through a section of the upper curved pipe 600 to further separate the remaining water, and then is connected to the inlet of the vacuum pump, which completely solves the risk of water on the gas side.

[0046] Preferably, the bending angle and diameter of the upper curved pipe 600 need to be designed according to the flow characteristics of the gas to reduce the resistance to the gas flow.

[0047] The rest of the structure is the same as that of Example 1.

[0048] Example 3

[0049] Reference Figure 2 , this embodiment is different from the above embodiment in that: the bottom of the collecting pipe 400 is connected to a decondensation pit 500, and the front end of the decondensation pit 500 is installed with an automatic drain valve 501;

[0050] The collecting pipe 400 is provided with a high liquid level detection point 401 and a low liquid level detection point 402;

[0051] The automatic drain valve 501 can automatically drain water according to the liquid level in the collection pipe 400;

[0052] The high liquid level detection point 401 and the low liquid level detection point 402 can monitor the water level in the collection pipe 400 in real time, and an automatic drain valve 501 is installed at the front end of the decondensation pit 500. The condensed water is automatically discharged to the decondensation pit 500 through the drain valve according to the liquid level measurement point. When the water level reaches the set upper limit, the automatic drain valve 501 is started to discharge the condensed water; when the water level drops to the set lower limit, the automatic drain valve 501 is closed to prevent leakage of non-condensable gas.

[0053] The rest of the structure is the same as that of Example 2.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A system for preventing water ingress into the gas side of a steam turbine vacuum pump, characterized in that: include, Condenser (100); A vacuum pump side (200), the gas-side inlet end of which is connected to the condenser (100); A pipe part (300) is used to connect the condenser (100) with the vacuum pump side (200).

2. The system for preventing water ingress to the gas side of a steam turbine vacuum pump according to claim 1, characterized in that: The vacuum pump side (200) comprises a first vacuum pump (201) and a second vacuum pump (202); Wherein, a group of the condensers (100) are connected to a first vacuum pump (201) and a second vacuum pump (202) respectively.

3. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 2, characterized in that: The condenser (100) is connected to a collecting pipe (400), and the collecting pipe (400) is capable of collecting condensed water from the condenser (100).

4. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 3, characterized in that: The pipeline part (300) comprises a connecting pipe (301), and the connecting pipe (301) is used to connect the condenser (100) and the collecting pipe (400).

5. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 4, characterized in that: An upper curved pipe (600) is provided between the collecting pipe (400) and the first vacuum pump (201) and the second vacuum pump (202).

6. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 5, characterized in that: A flow distribution pipe (302) is provided between the collecting pipe (400) and the two groups of upper curved pipes (600).

7. The system for preventing water ingress to the gas side of a steam turbine vacuum pump according to claim 5 or 6, characterized in that: Long tubes (303) are provided between the two groups of upper curved tubes (600) and the first vacuum pump (201) and the second vacuum pump (202).

8. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 7, characterized in that: The bottom of the collecting pipe (400) is connected to a decondensation pit (500), and an automatic drainage valve (501) is installed at the front end of the decondensation pit (500).

9. The system for preventing water ingress to the gas side of a steam turbine vacuum pump as claimed in claim 8, characterized in that: The collecting pipe (400) is provided with a high liquid level detection point (401) and a low liquid level detection point (402).

10. The system for preventing water ingress to the gas side of a steam turbine vacuum pump according to claim 8 or 9, characterized in that: The automatic drain valve (501) can automatically drain water according to the liquid level in the collection pipe (400).

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