Automatic temperature control device and method based on superheater

Abstract

The application discloses an automatic temperature control device and method based on a superheater, and relates to the technical field of superheaters. The automatic temperature control device based on the superheater comprises a superheater, the bottom of the superheater is fixedly connected with supporting legs, the two sides of the surface of the superheater are fixedly connected with a gas inlet pipe and an exhaust pipe which are in communication with the inside of the superheater, the top of the gas inlet pipe is provided with a temperature control mechanism arranged inside, the temperature control mechanism comprises a mounting pipe, the mounting pipe is located above the gas inlet pipe, and a flange is arranged between the gas inlet pipe and the mounting pipe. Through the arrangement of the temperature control mechanism, the cross section of steam passing through can be automatically adjusted by monitoring the steam flow in the gas inlet pipe, so that the steam in the superheater always maintains the same flow, the situation that the temperature of the discharged superheated steam changes due to the increase or decrease of the steam flow in the gas inlet pipe is avoided, the automatic temperature control of the device is realized, the use effect of the device is improved, and the device has high popularization value.

Description

Technical Field

[0001] This invention relates to the field of superheater technology, and in particular to an automatic temperature control device and method based on a superheater. Background Technology

[0002] When the superheater and reheater outlet steam temperatures in large coal-fired boilers are sprayed with water, automatic regulation is often used. Under normal circumstances, the dynamic characteristics of the superheater and reheater outlet steam temperatures change with the random load. However, in actual operation, the steam temperature is subject to many external disturbances, and it is difficult to reach the preset threshold range during the control process.

[0003] When using spray-type desuperheating for superheaters or reheaters, the opening of the regulating valve and the flow rate often do not correspond, resulting in large fluctuations in the desuperheating water flow rate. This, in turn, affects the effectiveness of automatic regulation of the superheater or reheater outlet steam temperature. Moreover, after the superheater and reheater outlet steam temperature is put into automatic operation during unit operation, large fluctuations in the desuperheating water flow rate often occur due to the mismatch between the opening of the desuperheating water regulating valve and the flow rate. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an automatic temperature control device and method based on a superheater, which can solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic temperature control device based on a superheater, comprising a superheater, characterized in that: a support leg is fixedly connected to the bottom of the superheater, and a vent pipe and an exhaust pipe connected to the inside of the superheater are fixedly connected to both sides of the surface of the superheater, respectively, and a temperature control mechanism is provided at the top of the vent pipe.

[0006] The temperature control mechanism includes an installation tube located above the vent pipe. A flange is provided between the vent pipe and the installation tube for connecting them. The surface of the installation tube is fixedly connected to the upper end of the vent pipe. A fixing plate is fixedly connected to the inner wall of the installation tube. A through hole is provided on the surface of the fixing plate. Two sliding plates are slidably connected inside the fixing plate. A lifting plate is provided at the bottom of the fixing plate. A groove is provided on the surface of the lifting plate, and the groove corresponds to the through hole.

[0007] Preferably, each of the two skateboard surfaces is fixedly connected to a first fixing rod, the surfaces of the two first fixing rods are slidably connected to the interior of the two skateboards respectively, and each of the surfaces of the two first fixing rods is fixedly connected to a first spring, the ends of the two first springs away from the two first fixing rods being fixedly connected to the interior of the two skateboards respectively.

[0008] Preferably, the surface of the lifting plate is fixedly connected to two slide rods, the surfaces of the two slide rods are slidably connected to the interior of the fixed plate, and the interior of the two slide plates is provided with movable grooves, and the surfaces of the two slide rods are slidably connected to the inner walls of the two movable grooves respectively.

[0009] Preferably, the cross-section of the movable groove is flag-shaped.

[0010] Preferably, a second spring is movably sleeved on the surface of each of the two slide rods, and the two ends of the two second springs are respectively fixedly connected to the surface of the two slide rods and the inside of the fixed plate.

[0011] Preferably, a second fixing rod is fixedly connected to the inner wall of the groove, and a conical extrusion block is fixedly connected to the end of the second fixing rod away from the groove, with the extrusion block located between the two sliding plates.

[0012] Preferably, the upper surface of the fixing disk is concave.

[0013] An automatic temperature control method based on a superheater: When the steam flow rate in the vent pipe increases, the covering area of ​​the connecting hole increases, reducing the cross-section of steam entering the superheater and increasing the steam injection velocity. When the steam flow rate in the vent pipe decreases, the cross-section of steam entering the superheater increases and the steam injection velocity decreases, thus ensuring that the steam flow rate in the superheater remains constant, thereby ensuring that the temperature of the superheated steam discharged from the superheater remains the same, and completing the automatic temperature control of the superheater.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The automatic temperature control device and method based on the superheater can automatically adjust the cross-section of the steam passage by monitoring the steam flow in the vent pipe through the temperature control mechanism, so that the steam in the superheater always maintains the same flow rate, avoiding the situation where the temperature of the discharged superheated steam changes due to the increase or decrease of the steam flow in the vent pipe, thus realizing automatic temperature control of the device. Secondly, the temperature of the superheated steam is no longer adjusted by spraying water, avoiding the situation where the temperature of the superheated steam changes too much, thereby affecting the use of the device, thus improving the use effect of the device and having high promotion value.

[0016] (2) The automatic temperature control device and method based on the superheater, the extrusion block is located between the two slide plates to open the two slide plates, ensuring that the two slide plates can never be closed, thereby ensuring that steam can always flow in the vent pipe, thus ensuring the smooth operation of the device.

[0017] (3) The automatic temperature control device and method based on the superheater, through the flag-shaped setting of the movable slot, avoids the situation where the two slides push the two slide rods out of the two movable slots under the elastic force of the two first springs when the device is not in use, thereby ensuring the smooth operation of the device. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of an automatic temperature control device and method based on a superheater according to the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the mounting tube of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the fixed disk of the present invention;

[0022] Figure 4 This is a side view of the skateboard of the present invention;

[0023] Figure 5 This is a schematic diagram of the surface structure of the skateboard of the present invention.

[0024] Reference numerals: 1. Superheater; 2. Vent pipe; 3. Support leg; 4. Flange; 5. Exhaust pipe; 6. Temperature control mechanism; 601. Fixed plate; 602. Connecting hole; 603. Slide plate; 604. Second spring; 605. Slide rod; 606. Groove; 607. Lifting plate; 608. Movable groove; 609. First spring; 610. First fixed rod; 611. Extrusion block; 612. Second fixed rod; 613. Mounting pipe. Detailed Implementation

[0025] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0026] Please see Figure 1-5 The present invention provides a technical solution: an automatic temperature control device based on a superheater, including a superheater 1, a support leg 3 fixedly connected to the bottom of the superheater 1 for supporting the superheater 1, and a vent pipe 2 and an exhaust pipe 5 fixedly connected to the two sides of the surface of the superheater 1 respectively, which are connected to the interior of the superheater 1 to inject saturated steam into the superheater 1 and discharge superheated steam.

[0027] The top of the vent pipe 2 is equipped with an internal temperature control mechanism 6. The temperature control mechanism 6 includes an installation pipe 613, which is located above the vent pipe 2. A flange 4 is provided between the vent pipe 2 and the installation pipe 613 for connecting the vent pipe 2 and the installation pipe 613. The surface of the installation pipe 613 is fixedly connected to the upper end of the vent pipe 2. A fixing plate 601 is fixedly connected to the inner wall of the installation pipe 613. The upper surface of the fixing plate 601 is concave, which can guide and gather the steam sprayed on the surface of the fixing plate 601.

[0028] The surface of the fixed plate 601 has a through hole 602 that provides a flow channel for water vapor. Two sliding plates 603 are slidably connected inside the fixed plate 601, blocking the through hole 602 to facilitate subsequent adjustment of the steam flow. A first fixing rod 610 is fixedly connected to the surface of each sliding plate 603, and the surfaces of the two first fixing rods 610 are slidably connected to the interior of each sliding plate 603. A first spring 609 is fixedly connected to the surface of each first fixing rod 610, with one end of each first spring 609 away from the two first fixing rods 610 fixedly connected to the interior of each sliding plate 603 to reset the sliding plates 603. The two first fixing rods 610 also guide the movement of the sliding plates 603, preventing them from tilting and ensuring smooth operation of the device. The two first springs 609 are always in a stretched state.

[0029] The bottom of the fixed plate 601 is provided with a lifting plate 607. The surface of the lifting plate 607 is provided with a groove 606, which corresponds to the connecting hole 602. Thus, the groove 606 can better receive and concentrate the impact force of steam in the vent pipe 2, thereby improving the use effect of the device.

[0030] Two sliding rods 605 are fixedly connected to the surface of the lifting plate 607. The surfaces of the two sliding rods 605 are slidably connected to the interior of the fixed plate 601. The interior of each of the two sliding plates 603 has a flag-shaped movable groove 608. The surfaces of the two sliding rods 605 are slidably connected to the inner walls of the two movable grooves 608 respectively. In the initial state of the device, the two sliding rods 605 are located in the vertical part of the two movable grooves 608 respectively. Thus, the flag-shaped setting of the movable grooves 608 avoids the situation where the two sliding plates 603 push the two sliding rods 605 out of the two movable grooves 608 under the elastic force of the two first springs 609 when the device is not in use, thereby ensuring the smooth operation of the device.

[0031] The surfaces of the two slide rods 605 are movably fitted with second springs 604. The two ends of the two second springs 604 are fixedly connected to the surfaces of the two slide rods 605 and the interior of the fixed plate 601, respectively. The two second springs 604 are always in a stretched state, and the elastic force of the two second springs 604 is greater than the elastic force of the two first springs 609.

[0032] A second fixing rod 612 is fixedly connected to the inner wall of the groove 606. A conical extrusion block 611 is fixedly connected to the end of the second fixing rod 612 away from the groove 606. The extrusion block 611 is located between the two sliding plates 603 and is used to open the two sliding plates 603, ensuring that the two sliding plates 603 can never be closed, thereby ensuring that steam can always flow in the vent pipe 2, thus ensuring the smooth operation of the device.

[0033] Furthermore, when the steam flows smoothly in the vent pipe 2, the steam impacts the groove 606 through the connecting hole 602, thereby causing the lifting plate 607 to slide down in the mounting pipe 613, and causing the two sliding rods 605 to slide down in the fixed plate 601, thereby pulling the two sliding rods 605 out from the vertical part of the two movable grooves 608, so that the two sliding rods 605 abut against the inclined surface of the inner wall of the two movable grooves 608, and at the same time stretching the two second springs 604 again. As the lifting plate 607 descends, the pressing block 611 is driven down through the second fixed rod 612. The extrusion block 611 is conical, which reduces the area between the two sliding plates 603. Under the force of the two first springs 609, the two sliding plates 603 move relative to each other, partially blocking the connecting hole 602 and reducing the steam flow. As the steam injection decreases, the impact force of the steam on the lifting plate 607 decreases. Then, under the force of the second spring 604, the lifting plate 607 rises, causing the two sliding plates 603 to move away from each other again, thus expanding the connecting hole 602 again and allowing the steam to flow more freely. The increased cross-sectional area of ​​the steam passage ensures that the steam flow rate in superheater 1 remains constant, preventing a decrease in steam injection and thus avoiding an increase in the temperature of the superheated steam discharged from superheater 1. Similarly, when there is a large amount of steam in vent pipe 2, the impact force on the lifting plate 607 increases, causing the two sliding plates 603 to move relative to each other. This increases the area of ​​the shielding hole 602, reducing the cross-sectional area of ​​the steam passage and again maintaining a constant steam flow rate in superheater 1. This prevents a decrease in the temperature of the discharged superheated steam caused by excessive steam injection in superheater 1. Furthermore, the temperature control mechanism 6 monitors the steam flow rate in vent pipe 2 and automatically adjusts the cross-sectional area of ​​the steam passage, ensuring a constant steam flow rate in superheater 1. This prevents changes in the temperature of the discharged superheated steam caused by increases or decreases in the steam flow rate in vent pipe 2, achieving automatic temperature control of the device. Moreover, the use of water spraying for superheated steam temperature regulation is eliminated, preventing excessive temperature fluctuations that could affect the device's operation. This improves the device's performance and has high promotional value.

[0034] An automatic temperature control method based on a superheater: When the steam flow rate in the vent pipe 2 increases, the covering area of ​​the connecting hole 602 increases, reducing the cross-section of steam entering the superheater 1 and increasing the steam injection velocity. When the steam flow rate in the vent pipe 2 decreases, the cross-section of steam entering the superheater 1 increases and the steam injection velocity decreases, thereby ensuring that the steam flow rate in the superheater 1 remains constant, thus ensuring that the temperature of the superheated steam discharged from the superheater 1 remains the same, and completing the automatic temperature control of the superheater 1.

[0035] Working principle: When steam flows smoothly in the vent pipe 2, the steam impacts the groove 606 through the connecting hole 602, thereby driving the lifting plate 607 to slide down in the mounting pipe 613, and driving the two sliding rods 605 to slide down in the fixed plate 601, thereby pulling the two sliding rods 605 out from the vertical part of the two movable grooves 608, so that the two sliding rods 605 abut against the inclined surface of the inner wall of the two movable grooves 608, and at the same time stretching the two second springs 604 again. As the lifting plate 607 descends, the second fixed rod 612 drives the extrusion block 611 to descend. Since the extrusion block 611 is conical, it further causes the extrusion block 611 to descend. The opening area between the two sliding plates 603 decreases, causing them to move relative to each other under the force of the two first springs 609. This partially blocks the connecting hole 602, reducing the steam flow. As the steam injection decreases, the impact force of the steam on the lifting plate 607 decreases. Then, under the force of the second spring 604, the lifting plate 607 is pulled up, causing the two sliding plates 603 to move away from each other again. This expands the connecting hole 602 again, increasing the cross-sectional area through which the steam passes, thus ensuring that the steam injection flow rate in the superheater 1 remains constant.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An automatic temperature control device based on a superheater, comprising a superheater (1), characterized in that: The bottom of the superheater (1) is fixedly connected to a support leg (3), and the two sides of the surface of the superheater (1) are respectively fixedly connected to a vent pipe (2) and an exhaust pipe (5) that communicate with the inside of the superheater (1). The top of the vent pipe (2) is provided with a temperature control mechanism (6) inside. The temperature control mechanism (6) includes an installation tube (613), which is located above the vent pipe (2). A flange (4) is provided between the vent pipe (2) and the installation tube (613) to connect the vent pipe (2) and the installation tube (613). The surface of the installation tube (613) is fixedly connected to the upper end of the vent pipe (2). A fixed plate (601) is fixedly connected to the inner wall of the installation tube (613). A through hole (602) is opened on the surface of the fixed plate (601). Two sliding plates (603) are slidably connected inside the fixed plate (601). A lifting plate (607) is provided at the bottom of the fixed plate (601). A groove (606) is opened on the surface of the lifting plate (607). The groove (606) corresponds to the through hole (602). The surfaces of the two slide plates (603) are fixedly connected to a first fixing rod (610), the surfaces of the two first fixing rods (610) are slidably connected to the interior of the two slide plates (603), the surfaces of the two first fixing rods (610) are fixedly connected to a first spring (609), and the ends of the two first springs (609) away from the two first fixing rods (610) are fixedly connected to the interior of the two slide plates (603); The lifting plate (607) has two slide rods (605) fixedly connected to its surface. The surfaces of the two slide rods (605) are slidably connected to the interior of the fixed plate (601). The interiors of the two sliding plates (603) are provided with movable grooves (608). The surfaces of the two slide rods (605) are slidably connected to the inner walls of the two movable grooves (608) respectively. The inner wall of the groove (606) is fixedly connected to a second fixing rod (612), and the end of the second fixing rod (612) away from the groove (606) is fixedly connected to a conical extrusion block (611), which is located between two sliding plates (603).

2. The automatic temperature control device based on a superheater according to claim 1, characterized in that: The cross-section of the movable groove (608) is flag-shaped.

3. The automatic temperature control device based on a superheater according to claim 1, characterized in that: The surfaces of the two slide rods (605) are movably fitted with second springs (604), and the two ends of the two second springs (604) are respectively fixedly connected to the surfaces of the two slide rods (605) and the interior of the fixed plate (601).

4. The automatic temperature control device based on a superheater according to claim 1, characterized in that: The upper surface of the fixed disk (601) is concave.

5. An automatic temperature control method based on a superheater: characterized in that: Using the automatic temperature control device based on a superheater as described in claim 1, the following method is employed: When the steam flow rate in the vent pipe (2) increases, the coverage area of ​​the connecting hole (602) increases, reducing the cross-section of steam entering the superheater (1) and increasing the steam injection velocity. When the steam flow rate in the vent pipe (2) decreases, the cross-section of steam entering the superheater (1) increases and the steam injection velocity decreases, so that the steam flow rate in the superheater (1) remains consistent, thereby ensuring that the temperature of the superheated steam discharged from the superheater (1) remains the same and completing the automatic temperature control of the superheater (1).

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