A boiler standby system

Abstract

The utility model discloses a kind of boiler hot backup systems, it is related to gas combustion boiler technical field, including boiler body, water tank component, fixed discharge expander, gas pressure power pipeline and controller;Boiler body top is provided with water inlet and air inlet, the bottom of boiler body is provided with regular blowdown, regular blowdown is connected with the regular blowdown pipeline that is communicated with fixed discharge expander;Regular blowdown pipeline is connected with the hot backup pipeline that is communicated with the liquid inlet of water tank component, the liquid outlet of water tank component is connected with the boiler feedwater pipeline that is communicated with the water inlet of boiler body;The air inlet of boiler body is communicated with gas pressure power pipeline;Gas pressure power pipeline, hot backup pipeline, regular blowdown pipeline and boiler feedwater pipeline are all provided with corresponding valve, power pump is arranged on boiler feedwater pipeline, all valves and power pump are signal connected with controller. Since water tank component water temperature is high, the utility model does not need to start gas boiler, boiler water replacement and recovery, gas boiler can also be hot backup.

Description

Technical Field

[0001] This utility model relates to the field of gas combustion boiler technology, and more specifically to the field of boiler thermal standby system technology. Background Technology

[0002] A gas-fired boiler is a device that uses combustible gas (such as natural gas, liquefied petroleum gas, city gas, etc.) as fuel to convert chemical energy into thermal energy through combustion, and heats water for heating or domestic hot water use.

[0003] In existing gas-fired boilers, when the heating load decreases and the boiler needs to be shut down for hot standby, the boiler must be started when the furnace temperature drops to about 60°C and shut down when the furnace temperature rises to about 350°C, so as to achieve the purpose of hot standby for gas-fired boilers.

[0004] Frequent start-ups and shutdowns of gas-fired boilers cause alternating stresses on the pressure-bearing and heat-bearing components due to thermal expansion and contraction. Long-term accumulation of these stresses can lead to metal fatigue, cracks, and even tube ruptures. In addition, the refractory materials inside the furnace may crack and peel off due to repeated thermal shocks, resulting in reduced insulation, increased heat loss, and even overheating and carbonization of the expansion joint connecting the furnace and the convection zone. Utility Model Content

[0005] The purpose of this utility model is to provide a boiler thermal standby system in order to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution: This utility model provides a boiler thermal standby system, including a boiler body, a water tank assembly, a fixed discharge expansion vessel, a pneumatic power pipeline, and a controller; The boiler body is equipped with a water inlet and an air inlet at the top, and a periodic drain outlet at the bottom. The periodic drain outlet is connected to a periodic drain pipe that is connected to the periodic drain expansion container. The regularly drained pipe is connected to a hot standby pipe that is connected to the liquid inlet of the water tank assembly, and the liquid outlet of the water tank assembly is connected to a boiler feedwater pipe that is connected to the water inlet of the boiler body. The air inlet of the boiler body is connected to the pneumatic power pipeline; The pneumatic power pipeline, hot standby pipeline, periodic sewage discharge pipeline, and boiler feedwater pipeline are all equipped with corresponding valves. The boiler feedwater pipeline is equipped with a power pump, and all valves and power pumps are connected to the controller signal.

[0007] Specifically, such as Figure 1As shown, a hot standby pipe is connected to the periodic blowdown pipe at the bottom of the boiler, leading to the standby interface of the water tank assembly. The boiler's drainage volume is controlled by valves, and the drainage power comes from the pressurized gas in the pneumatic power pipeline. The boiler water level is controlled by valves on the boiler feedwater pipe, and the water inlet power comes from the boiler's power pump. This allows the boiler to drain water while simultaneously receiving water. Because the water temperature in the water tank assembly is high (usually greater than 100℃), the temperature of the boiler body and furnace will rise and be maintained at a certain temperature to achieve the purpose of hot standby for the gas-fired boiler.

[0008] Therefore, this solution does not require starting the gas-fired boiler, replacing and recycling the boiler water, and the gas-fired boiler can also be kept on standby.

[0009] In one embodiment, the boiler body includes an upper boiler drum, a lower boiler bottom header, and multiple connecting pipes connecting the upper boiler drum and the lower boiler bottom header. The water inlet and air inlet of the boiler body are both located at the top of the upper boiler drum, and the periodic drain outlet is located at the bottom of the lower boiler bottom header.

[0010] In one embodiment, the pneumatic power line is a pressurized nitrogen line, and a third shut-off valve is installed on the pressurized nitrogen line. The nitrogen pressure in the pressurized nitrogen line is 0.5MPa-0.8MPa.

[0011] In one embodiment, the nitrogen pressure in the pressurized nitrogen pipeline is 0.6 MPa.

[0012] In one embodiment, the water tank assembly includes a deaerator water tank and a deaerator head disposed on the upper part of the deaerator water tank.

[0013] In one embodiment, a second shut-off valve and a first ball valve are sequentially installed on the hot standby pipeline according to the direction of medium flow, and the diameter of the hot standby pipeline is DN45mm-DN60mm.

[0014] In one implementation, the diameter of the hot standby pipe is DN50mm.

[0015] In one embodiment, a first shut-off valve, a second ball valve, and a scheduled automatic pneumatic valve are sequentially installed along the medium flow path of the periodic sewage discharge pipeline. The hot standby pipeline is connected to the periodic drain pipeline between the first shut-off valve and the second ball valve.

[0016] In one embodiment, an automatic boiler feedwater regulating valve is installed on the boiler feedwater pipeline, and the power pump is a boiler feedwater pump.

[0017] In one embodiment, the third shut-off valve, the second shut-off valve, the first shut-off valve, the first ball valve, the second ball valve, the automatic pneumatic valve for fixed discharge, the automatic boiler feedwater regulating valve, and the boiler feedwater pump are all connected to the controller signal.

[0018] Specifically, when the diameter of the hot standby pipeline is DN50mm, the nitrogen pressure in the pressurized nitrogen pipeline is 0.6MPa, and the water tank assembly is a deaerator water tank, the working principle of this scheme is as follows: A DN50mm hot standby pipe is connected to the regular blowdown pipe at the bottom of the boiler, leading to the standby interface of the deaerator water tank. The boiler drainage volume is controlled by the first shut-off valve, the second shut-off valve, and the first ball valve. The drainage power comes from the 0.6MPa nitrogen gas charged into the upper drum. The boiler water level is controlled by the boiler automatic feedwater regulating valve, and the water inlet power comes from the boiler feedwater pump. In this way, the boiler can drain water and inlet water at the same time. Since the water temperature in the deaerator water tank is high (usually greater than 100℃), the temperature of the boiler body and furnace will rise and maintain a certain temperature to achieve the purpose of hot standby of the gas boiler.

[0019] The beneficial effects of this utility model are as follows: 1. This utility model eliminates the need to start the gas boiler and achieves the purpose of hot standby for the gas boiler.

[0020] 2. A hot standby pipe is connected to the regular drain pipe at the bottom of the boiler, leading to the standby interface of the water tank assembly. The boiler's drainage volume is controlled by valves, and the drainage power comes from the pressurized gas in the pneumatic power pipeline. The boiler water level is controlled by valves on the boiler feed water pipeline, and the water inlet power comes from the boiler's power pump. This allows the boiler to drain water while simultaneously receiving water. Because the water temperature in the water tank assembly is high (usually greater than 100℃), the temperature of the boiler body and furnace will rise and be maintained at a certain temperature to achieve the purpose of hot standby for the gas-fired boiler. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Reference numerals in the attached diagram: 1-Third shut-off valve; 2-First shut-off valve; 3-Second shut-off valve; 4-First ball valve; 5-Boiler feedwater pump; 6-Automatic pneumatic valve for fixed discharge; 7-Second ball valve; 8-Automatic feedwater regulating valve for boiler. Detailed Implementation

[0024] To make the technical problems, technical solutions, and technical effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Example 1 like Figure 1 As shown, this embodiment provides a boiler thermal standby system, including a boiler body, a water tank assembly, a fixed discharge expansion vessel, a pneumatic power pipeline, and a controller; The boiler body is equipped with a water inlet and an air inlet at the top, and a periodic drain outlet at the bottom. The periodic drain outlet is connected to a periodic drain pipe that is connected to the periodic drain expansion container. The regularly drained pipe is connected to a hot standby pipe that is connected to the liquid inlet of the water tank assembly, and the liquid outlet of the water tank assembly is connected to a boiler feedwater pipe that is connected to the water inlet of the boiler body. The air inlet of the boiler body is connected to the pneumatic power pipeline; The pneumatic power pipeline, hot standby pipeline, periodic sewage discharge pipeline, and boiler feedwater pipeline are all equipped with corresponding valves. The boiler feedwater pipeline is equipped with a power pump, and all valves and power pumps are connected to the controller signal.

[0029] Specifically, such as Figure 1 As shown, a hot standby pipe is connected to the periodic blowdown pipe at the bottom of the boiler, leading to the standby interface of the water tank assembly. The boiler's drainage volume is controlled by valves, and the drainage power comes from the pressurized gas in the pneumatic power pipeline. The boiler water level is controlled by valves on the boiler feedwater pipe, and the water inlet power comes from the boiler's power pump. This allows the boiler to drain water while simultaneously receiving water. Because the water temperature in the water tank assembly is high (usually greater than 100℃), the temperature of the boiler body and furnace will rise and be maintained at a certain temperature to achieve the purpose of hot standby for the gas-fired boiler.

[0030] Therefore, this solution does not require starting the gas-fired boiler, replacing and recycling the boiler water, and the gas-fired boiler can also be kept on standby.

[0031] Example 2 like Figure 1 As shown, this embodiment provides a boiler thermal standby system, including a boiler body, a water tank assembly, a fixed discharge expansion vessel, a pneumatic power pipeline, and a controller; The boiler body is equipped with a water inlet and an air inlet at the top, and a periodic drain outlet at the bottom. The periodic drain outlet is connected to a periodic drain pipe that is connected to the periodic drain expansion container. The regularly drained pipe is connected to a hot standby pipe that is connected to the liquid inlet of the water tank assembly, and the liquid outlet of the water tank assembly is connected to a boiler feedwater pipe that is connected to the water inlet of the boiler body. The air inlet of the boiler body is connected to the pneumatic power pipeline; The pneumatic power pipeline, hot standby pipeline, periodic sewage discharge pipeline, and boiler feedwater pipeline are all equipped with corresponding valves. The boiler feedwater pipeline is equipped with a power pump, and all valves and power pumps are connected to the controller signal.

[0032] The boiler body includes an upper boiler drum, a lower boiler bottom header, and multiple connecting pipes connecting the upper boiler drum and the lower boiler bottom header. The water inlet and air inlet of the boiler body are located at the top of the upper boiler drum, and the periodic blowdown outlet is located at the bottom of the lower boiler bottom header.

[0033] The pneumatic power pipeline is a pressurized nitrogen pipeline, and a third shut-off valve 1 is installed on the pressurized nitrogen pipeline. The nitrogen pressure in the pressurized nitrogen pipeline is 0.5MPa-0.8MPa.

[0034] The hot standby pipeline is equipped with a second shut-off valve 3 and a first ball valve 4 in sequence according to the direction of medium flow. The diameter of the hot standby pipeline is DN45mm-DN60mm.

[0035] The regular sewage discharge pipeline is equipped with a first shut-off valve 2, a second ball valve 7, and a regular discharge automatic pneumatic valve 6 in sequence along the medium flow path. The hot standby pipeline is connected to the periodic drain pipeline between the first shut-off valve 2 and the second ball valve 7.

[0036] The boiler feedwater pipeline is equipped with an automatic boiler feedwater regulating valve 8, and the power pump is a boiler feedwater pump 5.

[0037] The third shut-off valve 1, the second shut-off valve 3, the first shut-off valve 2, the first ball valve 4, the second ball valve 7, the automatic pneumatic valve 6, the boiler automatic feedwater regulating valve 8, and the boiler feedwater pump 5 are all connected to the controller signal.

[0038] Example 3 This embodiment is a further optimization based on embodiment 2, specifically: The nitrogen pressure in the pressurized nitrogen pipeline is 0.6 MPa. The diameter of the hot standby pipeline is DN50 mm.

[0039] The water tank assembly includes a deaerator water tank and a deaerator head located on the top of the deaerator water tank.

[0040] Specifically, when the diameter of the hot standby pipeline is DN50mm, the nitrogen pressure in the pressurized nitrogen pipeline is 0.6MPa, and the water tank assembly is a deaerator water tank, the working principle of this scheme is as follows: A DN50mm hot standby pipe is connected to the regular blowdown pipe at the bottom of the boiler, leading to the standby interface of the deaerator water tank. The boiler drainage volume is controlled by the first shut-off valve 2, the second shut-off valve 3, and the first ball valve 4. The drainage power comes from the 0.6MPa nitrogen gas charged into the upper drum. The boiler water level is controlled by the boiler automatic water supply regulating valve, and the water inlet power comes from the boiler feed water pump 5. In this way, the boiler can drain water while simultaneously receiving water. Because the water temperature in the deaerator water tank is high (usually greater than 100℃), the temperature of the boiler body and furnace will rise and be maintained at a certain temperature to achieve the purpose of hot standby of the gas boiler.

Claims

1. A boiler thermal standby system, characterized in that, This includes the boiler body, water tank assembly, fixed and expanded boiler tank, pneumatic power pipeline, and controller; The top of the boiler body is provided with a water inlet and an air inlet, and the bottom of the boiler body is provided with a periodic drain outlet. The periodic drain outlet is connected to a periodic drain pipe that is connected to the periodic drain expansion container. The periodic sewage discharge pipe is connected to a hot standby pipe that communicates with the liquid inlet of the water tank assembly, and the liquid outlet of the water tank assembly is connected to a boiler feedwater pipe that communicates with the water inlet of the boiler body. The air inlet of the boiler body is connected to the pneumatic power pipeline; The pneumatic power pipeline, the hot standby pipeline, the periodic sewage discharge pipeline, and the boiler feedwater pipeline are all equipped with corresponding valves. A power pump is installed on the boiler feedwater pipeline. All valves and the power pump are connected to the controller via signal.

2. A boiler thermal standby system according to claim 1, characterized in that, The boiler body includes an upper boiler drum, a lower boiler bottom header, and multiple connecting pipes connecting the upper boiler drum and the lower boiler bottom header. The water inlet and air inlet of the boiler body are both located at the top of the upper boiler drum, and the periodic drain outlet is located at the bottom of the lower boiler bottom header.

3. A boiler thermal standby system according to claim 2, characterized in that, The pneumatic power pipeline is a pressurized nitrogen pipeline, and a third shut-off valve (1) is installed on the pressurized nitrogen pipeline. The nitrogen pressure in the pressurized nitrogen pipeline is 0.5MPa-0.8MPa.

4. A boiler thermal standby system according to claim 3, characterized in that, The nitrogen pressure in the pressurized nitrogen pipeline is 0.6 MPa.

5. A boiler thermal standby system according to claim 3, characterized in that, The water tank assembly includes a deaerator water tank and a deaerator head disposed on the upper part of the deaerator water tank.

6. A boiler thermal standby system according to claim 5, characterized in that, The hot standby pipeline is provided with a second shut-off valve (3) and a first ball valve (4) in sequence according to the medium flow direction. The diameter of the hot standby pipeline is DN45mm-DN60mm.

7. A boiler thermal standby system according to claim 6, characterized in that, The diameter of the hot standby pipeline is DN50mm.

8. A boiler thermal standby system according to claim 6, characterized in that, The regular sewage discharge pipeline is equipped with a first shut-off valve (2), a second ball valve (7), and a regular discharge automatic pneumatic valve (6) in sequence along the medium flow path. The hot standby pipeline is connected to the periodic drain pipeline between the first shut-off valve (2) and the second ball valve (7).

9. A boiler thermal standby system according to claim 8, characterized in that, The boiler feedwater pipeline is equipped with an automatic boiler feedwater regulating valve (8), and the power pump is a boiler feedwater pump (5).

10. A boiler thermal standby system according to claim 9, characterized in that, The third shut-off valve (1), the second shut-off valve (3), the first shut-off valve (2), the first ball valve (4), the second ball valve (7), the automatic pneumatic valve (6), the boiler automatic feedwater regulating valve (8), and the boiler feedwater pump (5) are all connected to the controller via signal.

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