Methanol gasification burner for steam boiler

Abstract

The application discloses a methanol gasification combustor for a steam boiler and belongs to the technical field of steam boiler combustion equipment. Mainly comprising a combustor main body, further comprising: a fan, the air outlet end of the fan is communicated with a combustion chamber in the combustor main body; a conversion mechanism is installed on the air inlet end of the fan and comprises an air inlet pipe fixed at the air inlet of the fan, a valve plate one is rotatably arranged in the air inlet pipe, an oxygen inlet pipe is fixed on one side of the air inlet pipe, the oxygen inlet pipe is located between the air inlet of the fan and the valve plate one, a valve plate two is rotatably arranged in the oxygen inlet pipe, the valve plate one and the valve plate two rotate synchronously, and the opening states of the valve plate one and the valve plate two are opposite. The application realizes automatic complementary adjustment of air and oxygen flow by setting the conversion mechanism with reverse synchronous valve plates, so that appropriate combustion-supporting gas conditions can be provided under different loads.

Description

Technical Field

[0001] This application relates to the field of steam boiler combustion equipment technology, specifically a methanol gasification burner for steam boilers. Background Technology

[0002] Methanol, as a clean fuel, is increasingly widely used in the field of steam boilers. Methanol burners are the core equipment for achieving efficient and clean combustion of methanol. Existing methanol burners usually use a fan to directly blow air in as the combustion gas, and the air-fuel ratio adjustment mainly depends on changing the damper opening.

[0003] However, under low-load conditions, the above method requires a reduction in air volume to maintain stable combustion, but this also reduces the oxygen concentration in the combustion-supporting gas, which can easily lead to incomplete combustion of methanol, producing pollutants such as carbon monoxide, and may cause flameout. Under high-load conditions, although a large air volume is required, simply increasing the air flow will make it difficult for the flame temperature to rise further due to the presence of a large amount of nitrogen, thus limiting combustion efficiency.

[0004] Therefore, it is necessary to provide a methanol gasification burner for steam boilers to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a methanol gasification burner for a steam boiler, which achieves automatic complementary regulation of air and oxygen flow by setting a switching mechanism with a reverse synchronization valve plate, thereby providing appropriate combustion-supporting gas conditions under different loads.

[0007] The technical solution adopted by this application to solve its technical problem is: a methanol gasification burner for a steam boiler, including a burner body, and further comprising: A blower, the outlet of which is connected to the combustion chamber inside the burner body; The conversion mechanism is installed on the air inlet end of the fan, including an air inlet pipe fixed at the air inlet of the fan, a valve plate 1 rotating inside the air inlet pipe, an oxygen inlet pipe fixed on one side of the air inlet pipe, the oxygen inlet pipe being located between the air inlet of the fan and the valve plate 1, a valve plate 2 rotating inside the oxygen inlet pipe, the valve plate 1 and the valve plate 2 rotating synchronously, and the valve plate 1 and the valve plate 2 opening states being opposite; An oxygen supply pipe, which is connected to an oxygen inlet pipe, is used to introduce oxygen.

[0008] Furthermore, a motor is fixedly installed on the lower end face of the intake pipe. The motor drives the valve plate to rotate through a transmission assembly. The transmission assembly includes a driving rod, a connecting rod, and a driven rod. Sliding grooves are provided on the inner sides of the driving rod and the driven rod. The two ends of the connecting rod are slidably sleeved in the sliding grooves on the driving rod and the driven rod, respectively. One end of the driving rod is fixedly connected to the output end of the motor, and one end of the driven rod is fixedly connected to the shaft end of the valve plate.

[0009] Furthermore, the valve plate one and valve plate two rotate synchronously through the transmission assembly two. The transmission assembly two includes a driving rod two, a connecting rod two, and a driven rod two. The inner sides of the driving rod two and the driven rod two are provided with sliding grooves. The two ends of the connecting rod two are respectively slidably sleeved in the sliding grooves on the driving rod two and the driven rod two. One end of the driving rod two is fixedly connected to the shaft end of the valve plate one, and one end of the driven rod two is fixedly connected to the shaft end of the valve plate two.

[0010] Furthermore, a filter screen is fixedly connected to the inlet of the valve plate.

[0011] Furthermore, an oxygen content sensor is installed on one side of the valve plate. The oxygen content sensor has at least two detection terminals: one detection terminal is used to detect the oxygen content at the air inlet of the fan, and the other detection terminal is used to detect the oxygen content at the air outlet of the fan.

[0012] Furthermore, a flame outlet is installed on one side of the burner body, and the flame outlet is connected to the combustion chamber inside the burner body.

[0013] Furthermore, a sight glass and a feed pump are installed on the other side of the burner body. The sight glass is used to observe the flame combustion state in the combustion chamber inside the burner body, and the feed pump is used to pressurize the fuel and stably deliver it to the combustion chamber inside the burner body.

[0014] The beneficial effects of this application are as follows: The methanol gasification burner for steam boilers provided in this application, by setting valve plate one and valve plate two driven by a motor and linked by a linkage mechanism, can realize the reverse synchronous opening and closing of the air passage and the oxygen passage. Under low load, the air valve plate one can be closed and the oxygen valve plate two can be opened simultaneously to maintain a small total gas volume while ensuring a high oxygen concentration and ensuring stable and complete combustion. Under high load, the air valve plate one is opened and the oxygen valve plate two is closed or closed, using a large amount of air to assist combustion and saving oxygen costs. It realizes the automatic matching of combustion gas concentration and flow rate, and improves the combustion efficiency and cleanliness of methanol under different operating conditions.

[0015] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a methanol gasification burner for a steam boiler according to this application. Figure 1 ; Figure 2 This is a schematic diagram of a methanol gasification burner for a steam boiler according to this application. Figure 2 ; Figure 3 This is a schematic diagram of the conversion mechanism of a methanol gasification burner for a steam boiler according to this application; Figure 4 This is a schematic diagram of the transmission component two of a methanol gasification burner for a steam boiler according to this application.

[0017] The following are the labeling elements in the figure: 1. Combustion engine body; 2. Flame outlet; 3. Fan; 4. Oxygen supply pipe; 5. Conversion mechanism; 51. Inlet pipe; 52. Motor; 53. Transmission assembly one; 531. Driving rod one; 532. Connecting rod one; 533. Driven rod one; 54. Oxygen inlet pipe; 55. Transmission assembly two; 551. Driving rod two; 552. Connecting rod two; 553. Driven rod two; 56. Filter screen; 57. Valve plate one; 58. Valve plate two; 6. Sight glass; 7. Feed pump; 8. Oxygen content sensor. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] like Figure 1-4 As shown, this application provides a methanol gasification burner for a steam boiler, including a burner body 1. The burner body 1 is provided with a combustion chamber and a methanol gasification and injection system (which is prior art and is not shown in the figure). A flame outlet 2 is fixedly connected to one side of the burner body 1 for injecting flames into the furnace of the steam boiler.

[0021] A fan 3 is fixed on the burner body 1 by a bracket. The air outlet of the fan 3 is connected to the combustion chamber inside the burner body 1 through an air duct to provide combustion air. A conversion mechanism 5 is installed at the air inlet of the fan 3.

[0022] The conversion mechanism 5 includes an air inlet pipe 51 fixedly connected to the air inlet of the fan 3. A valve plate 57 is rotatably installed inside the air inlet pipe 51 via a rotating shaft to control the opening degree of the air passage. An oxygen inlet pipe 54 is welded and fixed on one side of the pipe wall of the air inlet pipe 51. The oxygen inlet pipe 54 is located between the valve plate 57 and the air inlet of the fan 3. A valve plate 58 is also rotatably installed inside the oxygen inlet pipe 54 via a rotating shaft to control the opening degree of the oxygen passage.

[0023] One of them is an oxygen supply pipe 4 connected to an oxygen inlet pipe 54, and the oxygen supply pipe 4 is connected to an external oxygen source.

[0024] To achieve the linkage and reverse control of valve plate 57 and valve plate 58, a motor 52 is fixed to the lower end face of the intake pipe 51 by a mounting base. The output shaft of the motor 52 is connected to the rotating shaft of valve plate 57 through transmission assembly 53. Transmission assembly 53 includes a driving rod 531, a connecting rod 532, and a driven rod 533. One end of the driving rod 531 is fixed to the output shaft of the motor 52, and one end of the driven rod 533 is fixed to the rotating shaft of valve plate 57. Long strip-shaped grooves are opened on the inner sides of both. The two ends of the connecting rod 532 are slidably connected to the two grooves by pins, respectively, to convert the rotational motion of the motor 52 into the rotation of valve plate 57.

[0025] Valve plate 1 57 and valve plate 2 58 rotate synchronously in opposite directions via transmission assembly 2 55. The structure of transmission assembly 2 55 is similar to that of transmission assembly 1 53, including driving rod 2 551, connecting rod 2 552 and driven rod 2 553. Driving rod 2 551 is fixed to the other end of the rotating shaft of valve plate 1 57, and driven rod 2 553 is fixed to the rotating shaft end of valve plate 2 58. The two ends of connecting rod 2 552 are also slidably connected in the grooves of driving rod 2 551 and driven rod 2 553. When valve plate 1 57 is driven to rotate by motor 52, valve plate 2 58 will rotate synchronously in opposite directions through the transmission assembly 2 55. That is, when valve plate 1 57 rotates towards the closing direction, valve plate 2 58 rotates towards the opening direction.

[0026] A filter screen 56 is installed at the inlet of the intake pipe 51 to filter dust and fiber impurities in the intake air and protect the fan and combustion system.

[0027] An oxygen content sensor 8 is installed near valve plate 57. The sensor has at least two detection probes: one detection probe is used to detect the oxygen content at the air inlet of fan 3, and the other detection probe is used to detect the oxygen content at the air outlet of fan 3. The sensor signal can be connected to the control system to realize closed-loop regulation.

[0028] The burner body 1 is also equipped with a sight glass 6 and a feed pump 7. The sight glass 6 allows the operator to directly observe the shape and color of the flame in the combustion chamber and judge the combustion status. The feed pump 7 is used to extract liquid methanol from the storage tank, pressurize it and deliver it to the gasification device and nozzle inside the burner body 1.

[0029] Working principle: The boiler control system determines the load demand based on steam pressure or temperature signals.

[0030] When it is necessary to reduce the load or start up, the control system commands the motor 52 to rotate, driving the valve plate 57 to rotate in the closed direction, reducing the air intake; at the same time, through the transmission assembly 55, the valve plate 58 rotates synchronously in the open direction, increasing the oxygen intake; finally, the blower 3 receives a small flow rate of mixed gas with a high oxygen concentration, ensuring the stability and completeness of combustion in the low-fire state.

[0031] When the load needs to be increased, the control system commands the motor 52 to rotate in the opposite direction, driving the valve plate 57 to open wider and increase the air intake. At the same time, the valve plate 58 is closed in conjunction with the control system to reduce or cut off the oxygen supply. At this time, the fan 3 draws in a large flow of air with a normal oxygen concentration to meet the high-load combustion requirements while saving oxygen consumption.

[0032] The oxygen content sensor 8 monitors the oxygen concentration of the mixed gas in real time and feeds the signal back to the control system, which then finely adjusts the rotation angle of the motor 52 to achieve precise closed-loop control of the combustion-supporting gas concentration.

[0033] The above description is merely a preferred embodiment of this application and is 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 methanol gasification burner for a steam boiler, comprising a burner body (1), characterized in that, Also includes: The blower (3) has its air outlet end connected to the combustion chamber inside the burner body (1); The conversion mechanism (5) is installed on the air inlet end of the fan (3), including an air inlet pipe (51) fixed at the air inlet of the fan (3), a valve plate (57) rotating inside the air inlet pipe (51), an oxygen inlet pipe (54) fixed on one side of the air inlet pipe (51), the oxygen inlet pipe (54) being located between the air inlet of the fan (3) and the valve plate (57), a valve plate (58) rotating inside the oxygen inlet pipe (54), the valve plate (57) and the valve plate (58) rotating synchronously, and the valve plate (57) and the valve plate (58) opening states being opposite; Oxygen supply pipe (4) is connected to oxygen inlet pipe (54) for introducing oxygen.

2. The methanol gasification burner for a steam boiler according to claim 1, characterized in that: A motor (52) is fixedly installed on the lower end face of the air intake pipe (51). The motor (52) drives the valve plate (57) to rotate through the transmission assembly (53). The transmission assembly (53) includes a driving rod (531), a connecting rod (532), and a driven rod (533). The inner sides of the driving rod (531) and the driven rod (533) are provided with sliding grooves. The two ends of the connecting rod (532) are respectively slidably sleeved in the sliding grooves on the driving rod (531) and the driven rod (533). One end of the driving rod (531) is fixedly connected to the output end of the motor (52), and one end of the driven rod (533) is fixedly connected to the shaft end of the valve plate (57).

3. A methanol gasification burner for a steam boiler according to claim 2, characterized in that: The valve plate 1 (57) and valve plate 2 (58) rotate synchronously through the transmission assembly 2 (55). The transmission assembly 2 (55) includes a driving rod 2 (551), a connecting rod 2 (552), and a driven rod 2 (553). The inner sides of the driving rod 2 (551) and the driven rod 2 (553) are provided with sliding grooves. The two ends of the connecting rod 2 (552) are respectively slidably sleeved in the sliding grooves on the driving rod 2 (551) and the driven rod 2 (553). One end of the driving rod 2 (551) is fixedly connected to the shaft end of the valve plate 1 (57), and one end of the driven rod 2 (553) is fixedly connected to the shaft end of the valve plate 2 (58).

4. A methanol gasification burner for a steam boiler according to claim 1, characterized in that: A filter screen (56) is fixedly connected to the inlet of the valve plate (57).

5. A methanol gasification burner for a steam boiler according to claim 1, characterized in that: An oxygen content sensor (8) is installed on one side of the valve plate (57). The oxygen content sensor (8) has at least two detection ends. One detection end is used to detect the oxygen content at the air inlet of the fan (3), and the other detection end is used to detect the oxygen content at the air outlet of the fan (3).

6. A methanol gasification burner for a steam boiler according to claim 1, characterized in that: A flame outlet (2) is installed on one side of the burner body (1), and the flame outlet (2) is connected to the combustion chamber inside the burner body (1).

7. A methanol gasification burner for a steam boiler according to claim 6, characterized in that: A sight glass (6) and a feed pump (7) are installed on the other side of the burner body (1). The sight glass (6) is used to observe the flame combustion state in the combustion chamber inside the burner body (1), and the feed pump (7) is used to pressurize the fuel and stably deliver it to the combustion chamber inside the burner body (1).

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