Gas heating device of gas-fired boiler

Abstract

The utility model relates to the technical field of gas heating, and provides a gas-fired boiler gas heating device which comprises a heater body, the heater body comprises an upper shell, a lower shell, a partition plate and a plurality of heat exchange pipes, a gas inlet pipe and a gas outlet pipe are arranged on the upper shell, and a smoke inlet pipe and a smoke outlet pipe are arranged on the lower shell. The partition plate is arranged between the upper shell and the lower shell, the heat exchange pipe is arranged on the partition plate, the upper end of the heat exchange pipe is located in the upper shell, and the lower end of the heat exchange pipe is located in the lower shell. The phase-change heat transfer boiler has the advantages of being simple in structure and good in heat exchange effect, due to the fact that the phase-change heat transfer mode is adopted, heat transfer can be conveniently enhanced, the large heat exchange rate is obtained with the small temperature difference, full utilization of smoke waste heat is achieved, the smoke exhaust temperature loss is reduced, the boiler heat efficiency is improved, meanwhile, the gas temperature is increased, and the energy consumption is reduced. Heat absorption of fuel gas in the boiler is reduced, the ignition time is shortened, the combustion stability is improved, and the operation cost of the boiler is reduced.

Description

Technical Field

[0001] This application relates to the field of gas heating technology, and more specifically, to a gas heating device for a gas-fired boiler. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. Gas boilers are a type of boiler. During the operation of a gas boiler, after the ambient temperature gas enters the boiler, it requires more energy to heat up to the temperature required for combustion due to its low temperature. This leads to a decrease in combustion efficiency. The decrease in combustion efficiency not only increases fuel consumption but also increases the operating cost of the boiler.

[0003] Gas-fired boilers release heat after burning fuel. Some of this heat is supplied to users, some is recovered and reused, and some is wasted unintentionally. The flue gas discharged from the boiler also carries some heat into the atmosphere, resulting in flue gas heat loss, which is the largest heat loss among all boiler components and increases the boiler's operating costs. Utility Model Content

[0004] The purpose of this application is to provide a gas boiler gas heating device that uses waste heat from flue gas to heat the gas, reduces flue gas temperature loss, improves boiler thermal efficiency while increasing gas temperature, reduces heat absorption of gas in the boiler, shortens ignition time, improves combustion stability, and reduces boiler operating costs.

[0005] This application provides a gas boiler gas heating device, which adopts the following technical solution:

[0006] A gas boiler gas heating device includes a heater body, which includes an upper shell, a lower shell, a partition, and a plurality of heat exchange tubes. The upper shell is provided with a gas inlet pipe and a gas outlet pipe, and the lower shell is provided with a flue gas inlet pipe and a flue gas outlet pipe. The partition is disposed between the upper shell and the lower shell, and the heat exchange tubes are disposed on the partition. The upper end of the heat exchange tube is located inside the upper shell, and the lower end of the heat exchange tube is located inside the lower shell.

[0007] Preferably, the heat exchange tube is provided with a plurality of fins.

[0008] Preferably, the heat exchange tube is welded and fixed to the partition plate.

[0009] Preferably, both the upper housing and the lower housing are provided with a heat insulation layer on their exterior.

[0010] Preferably, both the upper housing and the lower housing are equipped with acoustic soot blowers.

[0011] Preferably, both the upper housing and the lower housing are provided with manhole doors.

[0012] Preferably, both the upper housing and the lower housing are provided with drain ports.

[0013] Preferably, temperature sensors are installed on the gas inlet pipe, the gas outlet pipe, the flue gas inlet pipe, and the flue gas outlet pipe.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This application has the advantages of simple structure and good heat exchange effect. It consists of an upper shell, a lower shell, and heat exchange tubes. High-temperature flue gas is introduced into the lower shell, and coal gas is introduced into the upper shell. The high-temperature flue gas heats the heat exchange medium inside the heat exchange tubes after contacting them. The heat exchange medium absorbs heat and vaporizes into steam. Under a small pressure difference, the flue gas rises to the upper end of the heat exchange tubes. The coal gas then cools the steam inside the heat exchange tubes after contacting them. The steam condenses into liquid upon contact with the condensate. The condensate flows back along the tube wall to the lower end of the heat exchange tubes under gravity and is reheated. Vaporization, in this continuous cycle, transfers heat from the lower end to the upper end of the heat exchange tubes. Since the entire heat exchange process takes place inside the heater body, heat loss is reduced and heat exchange efficiency is improved. Furthermore, due to phase change heat transfer, heat transfer can be easily enhanced, achieving a larger heat exchange rate with a smaller temperature difference. This allows for full utilization of waste heat from the flue gas, reduces exhaust gas temperature loss, improves boiler thermal efficiency, increases fuel gas temperature, reduces heat absorption of the fuel gas in the boiler, shortens ignition time, improves combustion stability, and reduces boiler operating costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The reference numerals in the attached figures are as follows:

[0019] 1. Heater body; 2. Upper shell; 3. Lower shell; 4. Baffle; 5. Heat exchange tube; 6. Gas inlet pipe; 7. Gas outlet pipe; 8. Flue gas inlet pipe; 9. Flue gas outlet pipe; 10. Fins; 11. Acoustic soot blower; 12. Manhole; 13. Drain outlet; 14. Temperature sensor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels 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.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for 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 application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Example

[0027] like Figure 1 As shown in the embodiment of this application, the gas boiler gas heating device includes a heater body 1. The heater body 1 includes an upper shell 2, a lower shell 3, a partition 4, and a plurality of heat exchange tubes 5. A gas inlet pipe 6 and a gas outlet pipe 7 are provided on the upper shell 2. A flue gas inlet pipe 8 and a flue gas outlet pipe 9 are provided on the lower shell 3. The partition 4 is provided between the upper shell 2 and the lower shell 3. The heat exchange tubes 5 are provided on the partition 4. The upper end of the heat exchange tube 5 is located inside the upper shell 2, and the lower end of the heat exchange tube 5 is located inside the lower shell 3. A liquid heat exchange medium is provided inside the heat exchange tube 5.

[0028] In operation, high-temperature flue gas is introduced into the lower shell 3 through the flue gas inlet pipe 8, and coal gas is introduced into the upper shell 2 through the flue gas outlet pipe 9. The high-temperature flue gas heats the heat exchange medium inside the heat exchange tubes 5 upon contact with them. The liquid heat exchange medium absorbs heat and vaporizes into steam. Under a small pressure difference, the flue gas rises to the upper end of the heat exchange tubes 5. The coal gas then cools the steam inside the heat exchange tubes 5 upon contact with them. The steam condenses into liquid upon contact with the condensate. Under the influence of gravity, the condensate flows back along the tube wall to the lower end of the heat exchange tubes 5 and is heated and vaporized again. This cycle repeats continuously, transferring heat from the heat exchange tubes to the lower shell 5. The lower end of tube 5 is connected to the upper end of heat exchange tube 5. Since the entire heat exchange process takes place inside the heater body 1, heat loss is reduced and heat exchange efficiency is improved. Furthermore, due to phase change heat transfer, heat transfer can be easily enhanced, achieving a larger heat exchange rate with a smaller temperature difference. This allows for full utilization of waste heat from the flue gas, reduces exhaust gas temperature loss, improves boiler thermal efficiency, increases gas temperature, reduces heat absorption of the gas in the boiler, shortens ignition time, improves combustion stability, and reduces boiler operating costs. The gas after heat exchange is discharged through gas outlet pipe 7, and the flue gas after heat exchange is discharged through flue gas outlet pipe 9.

[0029] In this embodiment, the heat exchange tube 5 is provided with a number of fins 10. The heat exchange fins 10 can increase the contact area between the heat exchange tube 5 and the gas, and between the heat exchange tube 5 and the flue gas, thereby improving the heat exchange effect.

[0030] In this embodiment, the heat exchange tube 5 is welded to the partition plate 4. The welding method is beneficial to effectively seal the hot and cold fluids, so that the hot and cold fluids do not leak from each other.

[0031] In this embodiment, both the upper shell 2 and the lower shell 3 are provided with heat insulation layers on their exteriors. The heat insulation layers can reduce the heat loss inside the upper shell 2 and the lower shell 3, thereby improving the heat utilization rate.

[0032] In this embodiment, both the upper shell 2 and the lower shell 3 are equipped with acoustic soot blowers 11. The acoustic soot blower 11 on the upper shell 2 is used to clean the part of the heat exchange tube 5 located inside the upper shell 2, and the acoustic soot blower 11 on the lower shell 3 is used to clean the part of the heat exchange tube 5 located inside the lower shell 3, removing the floating dust on the surface of the heat exchange tube 5 to prevent it from affecting the heat exchange efficiency of the heat exchange tube 5.

[0033] In this embodiment, both the upper housing 2 and the lower housing 3 are provided with manhole doors 12. The manhole doors 12 facilitate on-site assembly of the equipment and use during shutdown maintenance.

[0034] In this embodiment, both the upper housing 2 and the lower housing 3 are provided with a drain port 13. The drain port 13 on the upper housing 2 is connected to a drain pipeline. A drain valve is provided on the drain pipeline. The drain valve is in a normally open state and is located in a position that is easy to operate and maintain. The drain pipeline is gradually lowered and has a certain slope. The drain port 13 on the lower housing 3 is used to periodically drain the lower housing 3.

[0035] In this embodiment, temperature sensors 14 are installed on the gas inlet pipe 6, the gas outlet pipe 7, the flue gas inlet pipe 8, and the flue gas outlet pipe 9. The temperature of the gas inside the gas inlet pipe 6 and the gas outlet pipe 7 is detected by the corresponding temperature sensors 14, and the temperature of the flue gas inside the flue gas inlet pipe 8 and the flue gas outlet pipe 9 is detected by the corresponding temperature sensors 14.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A gas boiler gas heating device, characterized in that: The device includes a heater body, which comprises an upper shell, a lower shell, a partition, and a plurality of heat exchange tubes. The upper shell is provided with a gas inlet pipe and a gas outlet pipe, and the lower shell is provided with a flue gas inlet pipe and a flue gas outlet pipe. The partition is disposed between the upper shell and the lower shell, and the heat exchange tubes are disposed on the partition. The upper end of the heat exchange tube is located inside the upper shell, and the lower end of the heat exchange tube is located inside the lower shell.

2. The gas boiler gas heating device according to claim 1, characterized in that: The heat exchange tube is provided with several fins.

3. The gas boiler gas heating device according to claim 1, characterized in that: The heat exchange tube is welded and fixed to the partition plate.

4. The gas boiler gas heating device according to claim 1, characterized in that: Both the upper shell and the lower shell are provided with a heat insulation layer on their exterior.

5. A gas boiler gas heating device according to claim 1, characterized in that: Both the upper and lower housings are equipped with acoustic soot blowers.

6. A gas boiler gas heating device according to claim 1, characterized in that: Both the upper and lower housings are provided with manhole doors.

7. A gas boiler gas heating device according to claim 1, characterized in that: Both the upper and lower housings are provided with drain ports.

8. A gas boiler gas heating device according to claim 1, characterized in that: Temperature sensors are installed on the gas inlet pipe, the gas outlet pipe, the flue gas inlet pipe, and the flue gas outlet pipe.

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