Steam pocket wall temperature difference control device of gas-steam combined cycle unit

Abstract

The utility model discloses a steam drum wall temperature difference control device of a gas-steam combined cycle unit, which comprises a protective shell, a steam drum wall body is arranged in the protective shell, a group of annular pipes which are arranged at equal intervals are sleeved outside the steam drum wall body, a pump body is arranged on the upper surface of the protective shell, and the output end of the pump body is fixedly communicated with a water conveying pipe. The output end of the water conveying pipe penetrates through the protective shell and extends to the bottom of the protective shell, and the outer surface of each annular pipe and the outer surface of the water conveying pipe jointly communicate with a communicating pipe. According to the device, through the cooperation of the water conveying pipe, the annular pipe, the heat conduction rod and the annular heat dissipation pipe, after the water conveying pipe conveys water into the annular pipe, the water can absorb heat from the steam pocket wall body when flowing in the annular pipe, and meanwhile the heat conduction rod can rapidly transfer the heat absorbed by the water into the annular heat dissipation frame; the residence time of heat in the protective shell is shortened, and therefore it is guaranteed that the steam pocket wall body can rapidly reach and be maintained within the safe temperature range when needed.

Description

Technical Field

[0001] The utility model relates to the technical field of drum wall temperature control equipment for a gas-steam combined cycle unit, in particular to a drum wall temperature difference control device for a gas-steam combined cycle unit. Background Art

[0002] A gas-steam combined cycle unit is a high-efficiency power generation device, usually composed of a gas turbine and a steam turbine. It uses the waste heat of the gas turbine to generate steam, which in turn drives the steam turbine to generate electricity. In this system, the steam drum, also known as the steam drum or steam distributor, plays an important role. It is used to separate and distribute the steam generated from the boiler to various parts of the steam turbine.

[0003] Application No. 202222213246.X discloses a drum wall temperature difference control device for a gas-steam combined cycle unit, comprising a drum wall, the outside of which is fixedly connected to a heat exchanger and a support frame, the support frame being symmetrically fixedly connected to the side of the drum wall, the heat exchanger comprising a bidirectional heat exchange tube group and a flow guide seat, the side ends of the bidirectional heat exchange tube group being fixedly connected to the inner ends of the flow guide seat, the bidirectional heat exchange tube group and the internal spaces of the flow guide seat being in communication, and a protective shell being fixedly connected to the outside of the drum wall and the heat exchanger. When the utility model is used, the flow guide seat is used to guide water into the interior of the bidirectional heat exchange tube group, and then the water is guided back to the external temperature control device after the heat exchange is completed by the bidirectional heat exchange tube group. During the process, the bidirectional heat exchange tube group is used to start heat exchange from both sides, mutually attenuating the heat energy and playing a role of mutual compensation, thereby improving the uniformity of heat exchange.

[0004] The above solution has shortcomings when used. During the process of heat exchange using the first heat exchange tube and the second heat exchange tube, after the water absorbs heat in the heat exchange tube, it will not immediately and completely leave the environment of the protective shell, but will continue to flow inside the protective shell for a period of time. During this period, the water body that has heated up is relatively retained in the protective shell, and the absorbed heat cannot be immediately released to the external environment. The temperature inside the protective shell is difficult to drop rapidly due to this part of the "heat storage" effect, thereby slowing down the rate of effective cooling of the steam drum wall. To this end, we propose a steam drum wall temperature difference control device for a gas-steam combined cycle unit to solve the above problem. Utility Model Content

[0005] The purpose of the utility model is to provide a device for controlling the temperature difference of the drum wall of a gas-steam combined cycle unit, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A gas-steam combined cycle unit drum wall temperature difference control device comprises a protective shell, a drum wall body is provided inside the protective shell, a group of equidistantly arranged annular tubes are sheathed on the outside of the drum wall body, a pump body is mounted on the upper surface of the protective shell, an output end of the pump body is fixedly connected to a water pipe, the output end of the water pipe passes through the protective shell and extends to the bottom of the protective shell, the outer surface of each of the annular tubes is commonly connected to the outer surface of the water pipe by a connecting pipe, the outer surface of the protective shell is fixedly connected to a group of equidistantly arranged annular heat dissipation shells, the outer surface of each of the annular tubes is fixedly inlaid with annularly arranged heat conducting rods, and the end of each of the heat conducting rods away from the annular tube passes through the protective shell and extends to the interior of the annular heat dissipation shell.

[0008] In a further embodiment, a drain pipe is provided inside the protective shell, the bottom end of the drain pipe passes through the protective shell and extends to the bottom of the protective shell, and the outer surface of each annular tube is connected to the outer surface of the drain pipe by a connecting pipe.

[0009] In a further embodiment, the outer surface of each of the heat-conducting rods is provided with an insulation sleeve, and the end of each of the insulation sleeves close to the annular tube is connected to the outer surface of the annular tube, and the end of each of the insulation sleeves close to the protective shell is connected to the inner wall of the protective shell.

[0010] In a further embodiment, the bottom surface of each annular heat dissipation shell is fixedly connected to a drain pipe, the upper surface of each annular heat dissipation shell is fixedly connected to a water injection pipe, and the output end of each drain pipe and the input end of each water injection pipe are provided with a sealing plug.

[0011] In a further embodiment, the input end of the pump body is fixedly connected to a water pumping pipe, and an end of the water pumping pipe away from the pump body is provided with a connecting flange.

[0012] In a further embodiment, two groups of supports are fixedly connected to the bottom surface of the protective shell, and the two groups of supports are arranged in a ring.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This device cooperates with the water pipe, annular pipe, heat conducting rod and annular heat dissipation pipe. When the water pipe inputs water into the annular pipe, the water absorbs heat from the drum wall when flowing inside the annular pipe. At the same time, the heat conducting rod quickly transfers the heat absorbed by the water to the annular heat dissipation frame, reducing the residence time of heat in the protective shell, thereby ensuring that the drum wall can quickly reach and maintain a safe temperature range when needed.

[0015] 2. The provided insulation sleeve can prevent the heat-conducting rod from emitting heat to the inside of the protective shell after absorbing heat. The provided connecting pipe and the drain pipe can be used to discharge the water in the annular tube that has absorbed heat to the drain pipe. The drain pipe can then discharge the water that has absorbed heat out of the protective shell, thereby ensuring that external water enters the annular tube again to absorb heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the steam drum wall temperature difference control device of the gas-steam combined cycle unit.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the front cross-section of the protective shell of the steam drum wall temperature difference control device of the gas-steam combined cycle unit.

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the annular tube of the steam drum wall temperature difference control device of the gas-steam combined cycle unit.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the annular heat dissipation frame of the steam drum wall temperature difference control device of the gas-steam combined cycle unit.

[0020] In the figure: 1. Protective shell; 2. Steam drum wall body; 3. Pump body; 4. Water supply pipe; 5. Annular heat dissipation shell; 6. Drain pipe; 7. Support; 8. Water injection pipe; 9. Pumping pipe; 10. Heat conducting rod; 11. Drain pipe; 12. Insulation sleeve; 13. Annular pipe; 14. Connecting pipe; 15. Connecting pipe. DETAILED DESCRIPTION

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-4In the utility model, a gas-steam combined cycle unit drum wall temperature difference control device includes a protective shell 1, a drum wall body 2 is arranged inside the protective shell 1, and two groups of supports 7 are fixedly connected to the bottom surface of the protective shell 1. The two groups of supports 7 are arranged in a ring. The supports 7 can support the protective shell 1 and keep it in a stable state.

[0024] The outside of the drum wall body 2 is sheathed with a group of annular tubes 13 arranged at equal distances. The upper surface of the protective shell 1 is installed with a pump body 3. The input end of the pump body 3 is fixedly connected to a water pumping pipe 9. The end of the water pumping pipe 9 away from the pump body 3 is provided with a connecting flange. The water pumping pipe 9 is used to facilitate the staff to connect to the pipeline for transporting cooling water to the outside world, which is conducive to the extraction of cooling water.

[0025] The output end of the pump body 3 is fixedly connected to the water pipe 4. The output end of the water pipe 4 passes through the protective shell 1 and extends to the bottom of the protective shell 1. The outer surface of each annular tube 13 is connected to the outer surface of the water pipe 4 by a connecting pipe 14. When the pump body 3 is working, water can be injected into the water pipe 4. The water in the water pipe 4 can enter the annular tube 13 through the connecting pipe 14, and the annular tube 13 will absorb the heat on the boiler wall body 2.

[0026] A drain pipe 11 is provided inside the protective shell 1. The bottom end of the drain pipe 11 passes through the protective shell 1 and extends to the bottom of the protective shell 1. The outer surface of each annular tube 13 is connected to the outer surface of the drain pipe 11 by a connecting pipe 15. The water that absorbs heat in the annular tube 13 will enter the drain pipe 11 from the connecting pipe 15, and the drain pipe 11 will discharge the water that absorbs heat, so that new cooling water can be continuously injected into the annular tube 13.

[0027] The outer surface of the protective shell 1 is fixedly connected to a group of equidistantly arranged annular heat dissipation shells 5, which can hold cooling water. The outer surface of each annular tube 13 is fixedly inlaid with annularly arranged heat-conducting rods 10. The end of each heat-conducting rod 10 away from the annular tube 13 passes through the protective shell 1 and extends to the interior of the annular heat dissipation shell 5. When the heat-absorbing water inside the annular tube 13 flows, the heat-conducting rod 10 absorbs the heat in the water and conducts it to the water in the annular heat dissipation shell 5, thereby reducing the residence time of heat in the protective shell 1 and ensuring that the boiler wall body 2 can quickly reach and maintain a safe temperature range when needed.

[0028] The outer surface of each heat-conducting rod 10 is sleeved with a heat-insulating sleeve 12, and the end of each heat-insulating sleeve 12 close to the annular tube 13 is connected to the outer surface of the annular tube 13, and the end of each heat-insulating sleeve 12 close to the protective shell 1 is connected to the inner wall of the protective shell 1. The heat-insulating sleeve 12 can be used to wrap the exposed part of the heat-conducting rod 10 inside the protective shell 1, so as to prevent the heat-conducting rod 10 from dissipating inside the protective shell 1 when transferring heat.

[0029] The bottom surface of each annular heat dissipation shell 5 is fixedly connected to a drain pipe 6, and the upper surface of each annular heat dissipation shell 5 is fixedly connected to a water injection pipe 8. The output end of each drain pipe 6 and the input end of each water injection pipe 8 are provided with a sealing plug. The drain pipe 6 can be used by the staff to discharge the water that absorbs heat inside the annular heat dissipation shell 5, and new cooling water can be added through the water injection pipe 8, thereby ensuring the efficiency of heat absorption of the heat conducting rod 10.

[0030] The working principle of the present invention is as follows: when in use, an appropriate amount of water is first injected into the annular heat dissipation shell 5, and then the pump body 3 is used to pump water. The water pipe 4 will inject water from the connecting pipe 14 into the annular tube 13. When the water flows inside the annular tube 13, it will absorb heat from the drum wall body 2. At the same time, the heat conducting rod 10 will also absorb the heat in the water and conduct the heat to the inside of the annular heat dissipation shell 5. The heat absorbed by the water can be quickly transferred to the outside of the protective shell 1, thereby accelerating the effective cooling rate of the drum wall body 2 and reducing the residence time of heat inside the protective shell 1, thereby ensuring that the drum wall body 2 can quickly reach and maintain a safe temperature range when needed.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A drum wall temperature difference control device for a gas-steam combined cycle unit, characterized in that: The invention comprises a protective shell (1), wherein a drum wall body (2) is arranged inside the protective shell (1), and a group of annular tubes (13) arranged at equal distances are sleeved on the outside of the drum wall body (2); a pump body (3) is installed on the upper surface of the protective shell (1); the output end of the pump body (3) is fixedly connected to a water pipe (4); the output end of the water pipe (4) passes through the protective shell (1) and extends to the bottom of the protective shell (1); the outer surface of each annular tube (13) is connected to the outer surface of the water pipe (4) through a connecting pipe (14); the outer surface of the protective shell (1) is fixedly connected to a group of annular heat dissipation shells (5) arranged at equal distances; the outer surface of each annular tube (13) is fixedly inlaid with annularly arranged heat conducting rods (10); the end of each heat conducting rod (10) away from the annular tube (13) passes through the protective shell (1) and extends to the inside of the annular heat dissipation shell (5).

2. A gas-steam combined cycle unit drum wall temperature difference control device according to claim 1, characterized in that: A drainage pipe (11) is arranged inside the protective shell (1), the bottom end of the drainage pipe (11) passes through the protective shell (1) and extends to the bottom of the protective shell (1), and the outer surface of each annular tube (13) is connected to the outer surface of the drainage pipe (11) by a connecting pipe (15).

3. The device for controlling the steam drum wall temperature difference of a gas-steam combined cycle unit according to claim 1, characterized in that: The outer surface of each heat-conducting rod (10) is sleeved with a heat-insulating sleeve (12); one end of each heat-insulating sleeve (12) close to the annular tube (13) is connected to the outer surface of the annular tube (13); and one end of each heat-insulating sleeve (12) close to the protective shell (1) is connected to the inner wall of the protective shell (1).

4. The device for controlling the drum wall temperature difference of a gas-steam combined cycle unit according to claim 1, characterized in that: The bottom surface of each annular heat dissipation shell (5) is fixedly connected to a water discharge pipe (6), the upper surface of each annular heat dissipation shell (5) is fixedly connected to a water injection pipe (8), and the output end of each water discharge pipe (6) and the input end of each water injection pipe (8) are provided with a sealing plug.

5. The device for controlling the drum wall temperature difference of a gas-steam combined cycle unit according to claim 1, characterized in that: The input end of the pump body (3) is fixedly connected to a water pumping pipe (9), and one end of the water pumping pipe (9) away from the pump body (3) is provided with a connecting flange.

6. The device for controlling the steam drum wall temperature difference of a gas-steam combined cycle unit according to claim 1, characterized in that: Two groups of supports (7) are fixedly connected to the bottom surface of the protective shell (1), and the two groups of supports (7) are arranged in a ring shape.

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