Winter anti-freezing device for boiler

Abstract

The utility model relates to the technical field of boiler anti-freezing, in particular to a boiler winter anti-freezing device which comprises a heating anti-freezing unit installed on the outer side wall of a straight pipe of a boiler superheater and a heat preservation anti-freezing unit installed on the outer side wall of a bent pipe of the boiler superheater. A temperature measuring unit is installed on the outer side wall of a bent pipe of the boiler superheater inside the heating anti-freezing unit and used for measuring the temperature of the current position and transmitting the measuring result of the temperature measuring unit to an external temperature control center. The utility model optimizes the problem that residual water is frozen due to the fact that a large amount of accumulated water is easy to store in a snakelike sheet collecting structure of a superheater after a boiler of a thermal power plant is subjected to a water pressure test in winter and cannot be thoroughly discharged. The structural form that the outer side wall of the straight pipe of the boiler superheater is matched with the heating anti-freezing unit and the bent pipe section is matched with the heat preservation anti-freezing unit is adopted, the freezing probability of residual water in a pipeline of the superheater is greatly reduced, and the overall anti-freezing effect of the superheater is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler antifreeze, and in particular to a novel structure which indirectly improves the antifreeze effect of the entire boiler by improving the antifreeze effect of a boiler superheater in winter in cold areas, in particular a boiler winter antifreeze device. Background Art

[0002] The boiler in a thermal power plant is an important device that converts the heat energy generated by fuel combustion into steam, which in turn drives the steam turbine to generate electricity. Its main structure includes components such as the furnace, flue, economizer, superheater, and air preheater. Among them, the superheater often adopts a serpentine fin structure to improve heat exchange efficiency.

[0003] How to ensure that the boiler in a thermal power plant can safely survive the winter and shorten the winter antifreeze period is crucial for the safe operation of the boiler in winter. Therefore, the antifreeze treatment of the boiler is more important during the use of the boiler.

[0004] A search revealed a boiler antifreeze device disclosed in patent application number CN201820394040.2. Its main structure includes a left antifreeze cover, a right antifreeze cover, and a support mechanism. Both the left and right antifreeze covers are provided with an insulation layer for close contact with the inner wall of the boiler. When the left and right antifreeze covers are closed, they can enclose the boiler. It can be seen that the above-mentioned boiler antifreeze device mainly uses an antifreeze cover and an insulation layer to achieve antifreeze protection for the outer surface of the boiler.

[0005] However, after winter hydrostatic testing of thermal power plant boilers, the serpentine fin structure of the superheater is prone to accumulating large amounts of water, which cannot be completely drained. This phenomenon is particularly common in the serpentine fin vertical coils of high-temperature superheaters. Using only the external furnace cladding method described above as a conventional technique for preventing freezing of the serpentine fin structure of a boiler superheater is ineffective, especially in areas with large temperature fluctuations.

[0006] Based on this, the utility model optimizes and improves the antifreeze problem of boilers in winter in areas with large temperature deviations, and specially proposes a boiler winter antifreeze device with a new structure, which is used to improve the antifreeze effect of the serpentine vertical coil-shaped superheater after the water pressure test of the gas boiler in the thermal power plant in the cold winter, thereby improving the overall antifreeze effect of the boiler and better solving the problems existing in the existing technology. Utility Model Content

[0007] The present invention is to solve one of the above-mentioned technical problems, and the technical solution adopted is: a boiler winter antifreeze device, comprising a heating antifreeze unit installed on the outer wall of the straight tube of the boiler superheater and a thermal insulation antifreeze unit installed on the outer wall of the bent tube of the boiler superheater, a temperature measuring unit is installed on the outer wall of the bent tube of the boiler superheater inside the heating antifreeze unit, the temperature measuring unit is used to measure the temperature at the current position and transmit the measurement result to the temperature control center located outside, the opening and closing of the heating antifreeze unit is controlled by the temperature control center, and the temperature measuring unit is powered by a power supply unit installed on the outer wall of the straight tube of the boiler superheater.

[0008] In any of the above schemes, it is preferred that the heating and antifreeze unit includes an electric heating tube spirally wound on the outer wall of the straight tube of the boiler superheater, and a high-temperature resistant insulation component is sleeved on the outer wall of the electric heating tube. The two ends of the electric heating tube extend outward respectively and are connected to the external temperature control center behind the high-temperature resistant insulation component.

[0009] In any of the above schemes, it is preferred that the high-temperature resistant insulation component includes two insulation sleeves that are symmetrically arranged and fit together on the outer side wall of the straight tube of the boiler superheater, the inner side walls of the two insulation sleeves are in contact with the outer side wall of the spirally wound electric heating tube, and a connecting part is provided on both sides of each of the insulation sleeves, and the two butt-jointed connecting parts are fastened together by a plurality of bolts.

[0010] In any of the above solutions, it is preferred that the thermal insulation sleeve is made of glass wool material.

[0011] In any of the above schemes, it is preferred that the temperature measuring unit includes a temperature sensor fixedly installed on the outer wall of the curved pipe of the boiler superheater, the temperature sensor is connected to the power supply unit through a wire, and the temperature sensor is connected to the temperature control center signal through a signal line.

[0012] In any of the above schemes, it is preferred that the thermal insulation and antifreeze unit includes a fireproof insulation layer tightly sleeved on the outer side wall of the bent pipe of the boiler superheater, an insulation layer is sleeved on the periphery of the fireproof insulation layer, and both ends of the insulation layer are respectively provided with gear end covers that are threadedly screwed on the outer side wall of the bent pipe of the boiler superheater.

[0013] In any of the above solutions, preferably, the thickness of the fireproof and heat-insulating layer is 2cm-3cm; the thickness of the heat-insulating layer is 2cm-3cm.

[0014] In any of the above solutions, preferably, the heating temperature of the electric heating tube is between 0°C and 80°C.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The utility model is designed to address the problem that a large amount of water is easily stored in the serpentine plate structure of the superheater after the winter water pressure test of the boiler in a thermal power plant, and the residual water cannot be completely discharged, resulting in freezing and icing. The utility model adopts a structural form in which the outer wall of the straight tube of the boiler superheater is equipped with a heating antifreeze unit and the curved tube section is equipped with an insulation antifreeze unit, which greatly reduces the probability of freezing of residual water in the superheater pipe, and effectively improves the overall antifreeze effect of the superheater.

[0017] 2. In order to reduce the difficulty of installation, in the present invention, the electric heating tube is only wound on the outer side wall of the straight tube of the boiler superheater. At the same time, the heating of the electric heating tube is transmitted to the outer side wall of the straight tube of the boiler superheater. The heat conduction and radiation through the outer side wall of the straight tube of the boiler superheater can drive the temperature of the bent section of the boiler superheater, thereby enabling the boiler superheater pipeline as a whole to achieve the purpose of heating and anti-freezing.

[0018] 3. The present invention adopts a temperature sensor to detect the low-temperature portion of the boiler superheater's curved section, thereby being able to quickly obtain the low-temperature condition of the entire boiler superheater. The low temperature of the curved section of the boiler superheater is effectively used as a condition for triggering the heating operation of the entire heating and antifreeze unit, thereby safely monitoring the low temperature and preventing freezing and icing inside the boiler superheater.

[0019] 4. The heating and antifreeze unit adopts intermittent heating to achieve intermittent heating of the superheater pipeline and plays a role in temperature insulation and slowing down the temperature drop during the cooling process, so that it only plays a heating role when necessary, effectively reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or components are generally identified by similar reference numerals throughout the drawings. Elements or components in the drawings are not necessarily drawn to scale.

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 It is a schematic diagram of the partial internal structure of the utility model.

[0023] Figure 3 This is a three-dimensional schematic diagram of the installation structure at the superheater straight tube.

[0024] Figure 4 This is a three-dimensional structural diagram of the winding method of the electric heating tube of the present invention.

[0025] Figure 5 for Figure 4 Schematic diagram of the top view structure.

[0026] In the figure, 1. straight pipe of boiler superheater; 2. elbow of boiler superheater; 3. power supply unit; 4. electric heating pipe; 5. thermal insulation sleeve; 501. connection part; 502. bolt; 6. temperature sensor; 7. fireproof insulation layer; 8. thermal insulation layer; 9. gear end cover. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the present invention's technical solution and are therefore only examples and are not intended to limit the scope of protection of the present invention. Figure 1-Figure 5 As shown in .

[0028] Example 1: A boiler winter antifreeze device includes a heating antifreeze unit installed on the outer wall of the straight tube 1 of the boiler superheater and an insulation antifreeze unit installed on the outer wall of the bent tube 2 of the boiler superheater. A temperature measuring unit is installed on the outer wall of the bent tube 2 of the boiler superheater inside the heating antifreeze unit. The temperature measuring unit is used to measure the temperature at the current position and transmit the measurement result to a temperature control center located outside. The opening and closing of the heating antifreeze unit is controlled by the temperature control center, and the temperature measuring unit is powered by a power supply unit 3 installed on the outer wall of the straight tube 1 of the boiler superheater.

[0029] It should be noted that the boiler winter antifreeze device is mainly used to protect the boiler superheater pipeline, so as to control the residual water inside the entire superheater pipeline to be above the freezing temperature, and effectively deal with the freezing and icing problem caused by the low temperature inside the pipeline in cold areas in winter. When performing temperature control, a temperature measuring unit is used to collect the temperature of the low-temperature part of the entire superheater (that is, the temperature of the elbow 2 part of the boiler superheater) and use it as the current low-temperature benchmark for the entire superheater. When the low temperature reaches the set lower limit, the heating of the temperature control center is triggered, so that the existing temperature control center can drive the heating antifreeze unit to heat the straight pipe of the superheater. In the process of heating the straight pipe, since the pipe is made of metal material, it can effectively realize heat conduction and heat radiation of the temperature, thereby increasing the temperature of the elbow at the end of the straight pipe, thereby achieving the purpose of heating and antifreezing the entire superheater pipeline.

[0030] In any of the above schemes, it is preferred that the heating and antifreeze unit includes an electric heating tube 4 spirally wound on the outer wall of the straight tube 1 of the boiler superheater, and a high-temperature resistant insulation component is sleeved on the outer wall of the electric heating tube 4. The two ends of the electric heating tube 4 extend outward respectively and are connected to the external temperature control center behind the high-temperature resistant insulation component.

[0031] When the heating and antifreeze unit is working, the electric heating tube 4 is controlled by the existing external temperature control center to heat up, and after heating up, the straight tube of the superheater is driven to heat up. At the same time, after heating up, the high-temperature resistant insulation component can reduce the heat dissipation to the outside, and effectively achieve a certain insulation effect.

[0032] In any of the above schemes, it is preferred that the high-temperature resistant insulation component includes two symmetrically arranged insulation sleeves 5 that are fitted on the outer side wall of the straight tube 1 of the boiler superheater, the inner side walls of the two insulation sleeves 5 are in contact with the outer side wall of the spirally wound electric heating tube 4, and a connecting part 501 is provided on both sides of each of the insulation sleeves 5, and the two butt-jointed connecting parts 501 are fastened together by a plurality of bolts 502.

[0033] The high temperature resistant heat preservation component is installed by using two heat preservation sleeves 5 to be symmetrically clamped together. The clamping effect can be effectively guaranteed by relying on the bolts 502, and it can also be easily replaced or disassembled for maintenance.

[0034] In any of the above solutions, it is preferred that the thermal insulation sleeve 5 is made of glass wool material. Glass wool can achieve the purpose of heat preservation, fire resistance and high temperature resistance.

[0035] In any of the above schemes, it is preferred that the temperature measuring unit includes a temperature sensor 6 fixedly installed on the outer wall of the bent pipe 2 of the boiler superheater, the temperature sensor 6 is connected to the power supply unit 3 through a wire, and the temperature sensor 6 is connected to the temperature control center signal through a signal line.

[0036] The main component of the temperature measuring unit is the temperature sensor 6. Relying on the temperature detection of the temperature sensor 6, it can accurately obtain the low-temperature part on the current superheater, and then use the low temperature as a benchmark to compare the obtained low temperature with the set lower temperature limit value, so as to quickly determine whether it is necessary to trigger the heating function of the current heating and antifreeze unit.

[0037] Example 2: Compared with Example 1, this example also includes the following technical features:

[0038] In any of the above schemes, it is preferred that the thermal insulation and antifreeze unit includes a fireproof insulation layer 7 tightly sleeved on the outer side wall of the bent pipe 2 of the boiler superheater, and an insulation layer 8 is sleeved on the periphery of the fireproof insulation layer 7, and the two ends of the insulation layer 8 are respectively provided with a gear end cover 9 threadedly screwed on the outer side wall of the bent pipe 2 of the boiler superheater.

[0039] The heat preservation and antifreeze unit relies on the fireproof heat preservation layer 7 to play a heat preservation role, and relies on the heat insulation layer 8 to prevent the internal heat from escaping, and can also play a certain heat preservation effect.

[0040] In any of the above solutions, preferably, the thickness of the fireproof and heat-insulating layer 7 is 2cm-3cm; the thickness of the heat-insulating layer 8 is 2cm-3cm.

[0041] The thickness of the heat-insulating sleeve 5 is 1.5 to 2 times the thickness of the fireproof heat-insulating layer 7. Increasing the thickness of the heat-insulating sleeve 5 can provide a better heat-insulating effect on the superheater straight tube.

[0042] In any of the above solutions, preferably, the heating temperature of the electric heating tube 4 is between 0°C and 80°C.

[0043] Setting the appropriate temperature heating range can ensure the heating effect and insulation time while also saving heating energy.

[0044] Specific working principle: The entire boiler winter antifreeze device is mainly used to protect the boiler superheater pipeline, so as to control the residual water inside the entire superheater pipeline to remain above the freezing temperature, and effectively deal with the freezing and icing problem caused by the low temperature inside the pipeline in cold areas in winter.

[0045] When performing temperature control, a temperature measurement unit is used to collect the temperature of the low-temperature part of the entire superheater (i.e., the temperature of the elbow 2 part of the boiler superheater) and use it as the current low-temperature benchmark for the entire superheater. When the low temperature reaches the set lower limit, the heating of the temperature control center is triggered, so that the existing temperature control center can drive the heating and antifreeze unit to heat the straight pipe of the superheater.

[0046] In the process of heating the straight pipe, since the pipe is made of metal material, it can effectively realize the heat conduction and heat radiation of the temperature, thereby causing the temperature of the elbow at the end of the straight pipe to rise, thereby achieving the purpose of heating and anti-freezing of the entire pipeline of the superheater.

[0047] In summary, it can be seen that the present invention is optimized to address the problem that a large amount of water is easily stored in the serpentine collecting structure of the superheater after the winter water pressure test of the boiler in a thermal power plant, and the residual water cannot be completely discharged, resulting in freezing and ice. The outer wall of the straight tube 1 of the boiler superheater is matched with a heating antifreeze unit, and the bent pipe section is matched with an insulation antifreeze unit. This greatly reduces the probability of freezing of residual water in the pipe of the superheater, and effectively improves the overall antifreeze effect of the superheater. In order to reduce the difficulty of installation, the present invention only wraps the electric heating tube 4 around the outer wall of the straight tube 1 of the boiler superheater, and at the same time relies on the heating and temperature rise of the electric heating tube 4 to be transmitted to the outer wall of the straight tube 1 of the boiler superheater. The heat conduction and radiation through the outer wall of the straight tube 1 of the boiler superheater can drive the temperature of the bent pipe 2 section of the boiler superheater, thereby enabling the boiler superheater pipeline to achieve the purpose of heating and antifreeze as a whole. In addition, a temperature sensor 6 is used to detect the elbow section 2 of the boiler superheater at a low temperature, so that the low temperature condition of the entire boiler superheater can be quickly obtained. The low temperature of the elbow section 2 of the boiler superheater is effectively used as a condition for triggering the heating operation of the entire heating and antifreeze unit, thereby safely monitoring the low temperature and preventing freezing and icing inside the boiler superheater. The heating and antifreeze unit adopts an intermittent heating method to achieve intermittent heating of the superheater pipeline and plays a role in temperature insulation and slowing down the temperature during the cooling process, so that it only performs a heating process when necessary, effectively reducing energy consumption.

[0048] 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 above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the scope of protection of the present invention.

[0049] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. Boiler winter antifreeze device, characterized by: It includes a heating and antifreeze unit installed on the outer wall of the straight tube of the boiler superheater and a thermal insulation and antifreeze unit installed on the outer wall of the bent tube of the boiler superheater. A temperature measuring unit is installed on the outer wall of the bent tube of the boiler superheater inside the heating and antifreeze unit. The temperature measuring unit is used to measure the temperature at the current position and transmit the measurement result to the temperature control center located outside. The opening and closing of the heating and antifreeze unit is controlled by the temperature control center. The temperature measuring unit is powered by a power supply unit installed on the outer wall of the straight tube of the boiler superheater.

2. The boiler winter antifreeze device according to claim 1, characterized in that: The heating and antifreeze unit includes an electric heating tube spirally wound on the outer wall of the straight tube of the boiler superheater, and a high-temperature resistant insulation component is sleeved on the outer wall of the electric heating tube. The two ends of the electric heating tube extend outward and are connected to the external temperature control center behind the high-temperature resistant insulation component.

3. The boiler winter antifreeze device according to claim 2, characterized in that: The high-temperature resistant insulation component includes two symmetrically arranged insulation sleeves that are fitted on the outer side walls of the straight tubes of the boiler superheater. The inner side walls of the two insulation sleeves are in contact with the outer side walls of the spirally wound electric heating tubes. A connecting part is provided on both sides of each insulation sleeve, and the two butt-jointed connecting parts are fastened together by a number of bolts.

4. The boiler winter antifreeze device according to claim 3, characterized in that: The thermal insulation sleeve is made of glass wool material.

5. The boiler winter antifreeze device according to claim 4, characterized in that: The temperature measuring unit includes a temperature sensor fixedly mounted on the outer wall of the elbow of the boiler superheater. The temperature sensor is connected to the power supply unit via a wire, and the temperature sensor is connected to the temperature control center signal via a signal line.

6. The boiler winter antifreeze device according to claim 5, characterized in that: The thermal insulation and antifreeze unit includes a fireproof insulation layer tightly sleeved on the outer side wall of the bent pipe of the boiler superheater, an insulation layer is sleeved on the periphery of the fireproof insulation layer, and both ends of the insulation layer are respectively provided with gear end covers that are threadedly screwed on the outer side wall of the bent pipe of the boiler superheater.

7. The boiler winter antifreeze device according to claim 6, characterized in that: The thickness of the fireproof and heat-insulating layer is 2cm-3cm; the thickness of the heat-insulating layer is 2cm-3cm.

8. The boiler winter antifreeze device according to claim 7, characterized in that: The heating temperature of the electric heating tube is between 0°C and 80°C.

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