Deep Peak Shaving Stable Combustion Burner

Abstract

Provide a deep peak shaving stable combustion burner that can control the wall temperature of the burner so that it does not become too high and protect the burner from burnout. 【Solution means】The deep peak shaving stable combustion burner includes a pre-combustion chamber. One side of the pre-combustion chamber is connected to the primary air chamber. One end of the primary air chamber away from the pre-combustion chamber is connected to the inlet elbow. A combustion cylinder penetrates through the axis of the primary air chamber. A lance is installed in the combustion cylinder. An injection head is installed at the output end of the lance. A pulverized coal cyclone is attached to the end of the combustion cylinder in the primary air chamber. The output of the lance is designed for a preset injection amount and can be used for the cold start-up or low-load steady combustion of a coal-fired power unit. In the secondary air chamber installed on the outer wall of the pre-combustion chamber, a secondary air door, a secondary air outlet, and a secondary air inlet are installed, and the opening degree of the secondary air door can be adjusted during the operation of the pre-combustion chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of stable combustion burners, and particularly discloses a deep peak shaving stable combustion burner.

Background Art

[0002] The deep peak shaving stable combustion burner is a new type of burner that is uniquely designed to maintain long-term stable combustion of pulverized coal by utilizing the special structure of the burner itself based on the conventional pre-combustion chamber type pulverized coal burner in order to meet the requirements of long-term low-load stable combustion of large-scale pulverized coal boilers.

[0003] However, most of the current stable combustion capabilities of pre-combustion chamber type burners have enhanced combustion by methods such as improving the mixing temperature of air and powder and strengthening high-temperature exhaust gas suction to improve the low-load stable combustion ability. However, in many cases, due to high-load heat loads caused by phenomena such as nozzle coking and combustion damage, the deep peak shaving function is poor. Therefore, technicians in the current field provide a deep peak shaving stable combustion burner to solve the above problems raised in the background art.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the drawbacks of the existing technology, the present invention provides a deep peak shaving stable combustion burner to solve the existing problems (most of the current stable combustion capabilities of pre-combustion chamber type burners have enhanced combustion by methods such as improving the mixing temperature of air and powder and strengthening high-temperature exhaust gas suction to improve the low-load stable combustion ability. However, in many cases, due to high-load heat loads caused by phenomena such as nozzle coking and combustion damage, the deep peak shaving ability is poor).

Means for Solving the Problems

[0005] To achieve the above object, the present invention provides the following technical solution: a deep peak shaving stable combustion burner, which includes a pre-combustion chamber. One side of the pre-combustion chamber is connected to a primary air chamber. One end of the primary air chamber away from the pre-combustion chamber is connected to an inlet elbow. A combustion cylinder penetrates through the axis of the primary air chamber. A lance is installed in the combustion cylinder. An injection head is installed at the output end of the lance. A pulverized coal cyclone is attached to the end of the combustion cylinder in the primary air chamber. The injection head is installed inside the pulverized coal cyclone. Secondary air chambers are installed on both the upper and lower sides of the pre-combustion chamber. A secondary air door is installed on the side of the secondary air chamber far from the pre-combustion chamber. A secondary air outlet is attached to the side of the secondary air chamber close to the pre-combustion chamber. Secondary air inlets are connected to both sides of the secondary air chamber.

[0006] Preferably, a monitoring slot is installed at the corner of the secondary air chamber, and a temperature monitoring device is installed in the monitoring slot. The monitoring end of the temperature monitoring device is in contact with the outer wall of the pre-combustion chamber. The temperature monitoring device in the monitoring slot monitors the temperature of the outer wall of the pre-combustion chamber.

[0007] Preferably, a pulverized coal passage is provided between the primary air chamber and the combustion cylinder. Pulverized coal is cycled by the primary air through the inlet elbow and the pulverized coal passage to the pre-combustion chamber. It is ignited by the pre-start flame of the combustion cylinder in conjunction with the lance and sprayed into the pre-combustion chamber. Under the influence of the rotating jet that is lifted and sucked by the pulverized coal cyclone, the pulverized coal partially forms a high-temperature exhaust gas reflux region in the pre-combustion chamber. The high-temperature exhaust gas continuously returns to the reflux region, and the high-temperature exhaust gas continuously refluxes to the reflux region, continuously heating the primary air pulverized coal mixture and stably burning the pulverized coal mixture.

[0008] Preferably, the secondary air chamber is in close contact with the outer wall of the pre - combustion chamber. The secondary air outlet penetrates the secondary air chamber and communicates with the pre - combustion chamber. Air is introduced into the secondary air chambers on both the upper and lower sides of the pre - combustion chamber from the secondary air chamber inlets. After the air is introduced, it exits in accordance with the secondary air door and at the same time, by adjusting the opening degree of the secondary air door, the wall temperature of the burner is controlled so as not to become too high, protecting the burner from burnout. At the same time, the secondary air outlet in the secondary air chamber introduces air into the pre - combustion chamber and blows out the ash accumulated inside the pre - combustion chamber with compressed air. By this installation, after the transformation of the burner, overheating does not occur during normal operation, the combustion efficiency does not decrease, and the carbon content of fly ash and slag is below the design value or below the normal operation value before transformation, enabling the pulverized coal to burn stably for a long time and meeting the long - term low - load stable combustion requirement of large - scale pulverized coal boilers.

Effect of the Invention

[0009] Compared with the prior art, the present invention provides a deep peak shaving stable combustion burner and has the following beneficial effects. By design, the deep peak shaving stable combustion burner of the present invention consists of a pre-combustion chamber, a primary air chamber, and a secondary air chamber, and a combustion cylinder is provided in the primary air chamber. The combustion cylinder is axially arranged in the pulverized coal cyclone, and a lance is provided on the combustion cylinder. The output of the lance is designed to be a preset injection amount and can be used for cold start-up or low-load steady combustion of a coal-fired unit. A secondary air door, a secondary air outlet, and a secondary air inlet are provided in the secondary air chamber provided on the outer wall of the pre-combustion chamber. During the operation of the pre-combustion chamber, by adjusting the opening degree of the secondary air door, it is possible to suppress the wall temperature of the burner from becoming too high and protect the burner from burnout. And the secondary air outlet in the secondary air chamber injects air into the pre-combustion chamber and blows out the ash accumulated inside the pre-combustion chamber with compressed air. With this installation, after the transformation of the burner, overheating does not occur during normal operation, the combustion efficiency does not decrease, and the carbon content of fly ash and slag is below the design value or the normal operation value before transformation, so that pulverized coal can burn stably for a long time, meeting the long-term low-load stable combustion demand of large pulverized coal boilers and improving the deep peak shaving function of the device.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0011] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0012] The present invention provides a deep peak shaving stable combustion burner, which is a technical solution, with reference to FIGS. 1, 2, and 3. It includes a pre-combustion chamber 1. One side of the pre-combustion chamber 1 is connected to a primary air chamber 2. An inlet elbow 3 is connected to the end of the primary air chamber 2 that is far from the pre-combustion chamber 1. There is a combustion cylinder 4 that axially penetrates the primary air chamber 2. An oil lance 5 is installed inside the combustion cylinder 4. An injection head 6 is installed at the output end of the lance 5. The combustion cylinder 4 is provided with a pulverized coal cyclone 7 at the end of the primary air chamber 2. The injection head 6 is installed in the pulverized coal cyclone 7. Secondary air chambers 9 are provided on both the upper and lower sides of the pre-combustion chamber 1. A secondary air door 11 is provided on the side of the secondary air chamber 9 that is away from the pre-combustion chamber 1. A secondary air outlet 12 is provided on the side of the secondary air chamber 9 that is close to the pre-combustion chamber 1. Secondary air inlets 10 are connected to both sides of the secondary air chamber 9. A monitoring slot 901 is opened at the corner of the secondary air chamber 9, and a temperature monitoring device 13 is installed in the monitoring slot 901. The monitoring end of the temperature monitoring device 13 is in contact with the outer wall of the pre-combustion chamber 1. The temperature monitoring device 13 in the monitoring slot 901 operates to monitor the temperature of the outer wall of the pre-combustion chamber 1.

[0013] Referring to FIGS. 1, 2, and 3, a pulverized coal passage 8 is installed between the primary air chamber 2 and the combustion cylinder 4. Pulverized coal is carried by the primary air and enters the pre-combustion chamber 1 through the inlet elbow 3 and the pulverized coal passage 8 in a swirling flow. Align the lance 5 with the flame of the pre-operated combustion cylinder 4 for ignition, eject it into the pre-combustion chamber 1, and under the influence of the rotating jet that is lifted and sucked by the pulverized coal cyclone 7, the pulverized coal partially forms a high-temperature exhaust gas reflux region in the pre-combustion chamber 1. The high-temperature exhaust gas continuously returns to the reflux region, and the high-temperature exhaust gas continuously refluxes to the reflux region, continuously heating the primary air pulverized coal mixture and stably burning the pulverized coal mixture. The secondary air chamber 9 is in close contact with the outer wall of the pre-combustion chamber 1, and the secondary air outlet 12 penetrates the secondary air chamber 9 and communicates with the pre-combustion chamber 1. Air enters the secondary air chambers 9 on both the upper and lower sides of the pre-combustion chamber 1 from the secondary air inlet 10. After the air enters, it meets the secondary air door 11 and exits the air, and by adjusting the opening degree of the secondary air door 11, the wall temperature of the burner is controlled so that it does not become too high, protecting the burner from burnout. At the same time, the secondary air outlet 12 in the secondary air chamber 9 allows air to enter the pre-combustion chamber 1 and blows out the ash accumulated inside the pre-combustion chamber 1 with compressed air. With this installation, after the transformation of the burner, overheating does not occur during normal operation, the combustion efficiency does not decrease, and the carbon content of fly ash and slag is below the design value or the normal operation value before the transformation, enabling the pulverized coal to burn stably for a long time and meeting the long-term low-load stable combustion requirement of large pulverized coal boilers.

[0014] The deep peak shaving stable combustion burner of this invention consists of a pre - combustion chamber 1, a primary air chamber 2, and a secondary air chamber 9. One end of the primary air chamber 2 communicates with the pre - combustion chamber 1, and the other end communicates with the inlet elbow 3. A combustion cylinder 4 is installed in the primary air chamber 2. The combustion cylinder 4 is axially arranged in the pulverized coal cyclone 7, and a lance 5 is installed in the combustion cylinder 4. The injection head 6 of the lance 5 is in the pulverized coal cyclone 7. The area between the combustion cylinder 4 and the primary air chamber 2 is the pulverized coal passage 8, and a monitoring slot 901 is installed in the secondary air chamber 9. A temperature monitoring device 13 is installed in the monitoring slot 901. Also, a secondary air door 11 and a secondary air outlet 12 are provided in the secondary air chamber 9, and a secondary air inlet 10 is connected to the secondary air chamber 9.

[0015] Pulverized coal is carried by the primary air and enters the pre - combustion chamber 1 through the inlet elbow 3 and the pulverized coal passage 8 in a swirling flow. Align the lance 5 with the flame of the pre - combustion chamber 4 which has been pre - operated and ignite it, then eject it into the pre - combustion chamber 1. Under the influence of the rotating jet that is lifted and sucked by the pulverized coal cyclone 7, the pulverized coal partially forms a high - temperature exhaust gas reflux region in the pre - combustion chamber 1. The high - temperature exhaust gas continues to flow back into the reflux region, continuously heating the primary air - pulverized coal mixture and stably burning the pulverized coal mixture. The output of this lance 5 is designed to be 60 kg / h and can be used for the cold start - up or low - load steady combustion of a coal - fired power unit.

[0016] In the secondary air chambers 9 on the upper and lower sides of the pre - combustion chamber 1, air enters from the secondary air inlets 10. After the air enters, it exits in accordance with the secondary air doors 11. When the pre - combustion chamber 1 operates, the temperature monitoring device 13 in the monitoring slot 901 operates to monitor the temperature of the outer wall of the pre - combustion chamber 1. Also, by adjusting the opening degree of the secondary air doors 11, it is possible to control so that the wall temperature of the burner does not become too high (the wall temperature of the burner is 650 °C or less), and the burner can be protected from burning out. And the secondary air outlets 12 in the secondary air chamber 9 send air into the pre - combustion chamber 1, and blow out the ash accumulated inside the pre - combustion chamber 1 with compressed air. With this installation, after the transformation of the burner, overheating does not occur during normal operation, the combustion efficiency does not decrease, and the carbon content of fly ash and slag is below the design value or below the normal operation value before the transformation, so that the pulverized coal can burn stably for a long time, meeting the long - term low - load stable combustion requirements of large - scale pulverized coal boilers.

[0017] Note that in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of such an actual relationship or order between these entities or operations. Further, "comprising", "comprised of", or any other variation of these means non - exclusive inclusion. Thus, a process, method, article, or facility that comprises a series of elements includes not only those elements but also other elements not explicitly listed, or elements specific to such a process, method, article, or facility.

[0018] Here, terms such as "attachment", "installation", "connection", "fixation", "screwing", etc. should be understood broadly unless there are specific explicit regulations or limitations. For example, it may be a fixed connection, a detachable connection, or integrated. It can be connected mechanically or electrically, directly connected, or indirectly connected through an intermediate medium, and it can also be the internal communication between two elements or the interaction relationship between two elements. Unless specifically limited explicitly, the specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the situation.

[0019] As described above, the embodiments of the present invention have been shown and described. It will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments of the present invention without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Explanation of Reference Numerals

[0020] 1 Pre-combustion chamber 2 Primary air chamber 3 Inlet elbow 4 Combustion cylinder 5 Lance 6 Injection head 7 Pulverized coal cyclone 8 Pulverized coal passage 9 Secondary air chamber 901 Monitoring slot 10 Secondary air inlet 11 Secondary air door 12 Secondary air outlet 13 Temperature monitoring device

Claims

1. A deep peak shaving stable combustion burner, comprising a pre - combustion chamber (1), one side of the pre - combustion chamber (1) is connected to a primary air chamber (2), one end of the primary air chamber (2) far from the pre - combustion chamber (1) is connected to an inlet elbow (3), a combustion cylinder (4) penetrates through the axis of the primary air chamber (2), a lance (5) is installed in the combustion cylinder (4), an injection head (6) is installed at the output end of the lance (5), a pulverized coal cyclone (7) is attached to the end of the combustion cylinder (4) in the primary air chamber (2), secondary air chambers (9) are installed on both the upper and lower sides of the pre - combustion chamber (1), a secondary air door (11) is installed on the side of the secondary air chamber (9) far from the pre - combustion chamber (1), a secondary air outlet (12) is attached to the side of the secondary air chamber (9) in close contact with the pre - combustion chamber (1), and secondary air inlets (10) are connected to both sides of the secondary air chamber (9). The deep peak shaving stable combustion burner is characterized by the above.

2. A monitoring slot (901) is installed at the corner of the secondary air chamber (9), a temperature monitoring device (13) is installed in the monitoring slot (901), and the monitoring end of the temperature monitoring device (13) is in contact with the outer wall of the pre - combustion chamber (1). The deep peak shaving stable combustion burner according to claim 1 is characterized by the above.

3. A pulverized coal passage (8) is provided between the primary air chamber (2) and the combustion cylinder (4). The deep peak shaving stable combustion burner according to claim 1 is characterized by the above.

4. The injection head (6) is provided inside the pulverized coal cyclone (7). The deep peak shaving stable combustion burner according to claim 1 is characterized by the above.

5. The secondary air chamber (9) is in close contact with the outer wall of the pre - combustion chamber (1). The deep peak shaving stable combustion burner according to claim 1 is characterized by the above.

6. The secondary air outlet (12) penetrates through the secondary air chamber (9) and communicates with the pre - combustion chamber (1). The deep peak shaving stable combustion burner according to claim 1 is characterized by the above.

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