Afterburning system of vertical heat recovery coke electricity waste heat boiler

Abstract

The invention discloses a vertical heat recovery coke-electricity waste heat boiler afterburning system which comprises a vertical heat recovery coke oven and a waste heat boiler and further comprises a connecting flue and a fan, the two ends of the connecting flue are connected with a flue gas outlet of the vertical heat recovery coke oven and a flue gas inlet of the waste heat boiler respectively, and the fan is connected with the connecting flue. An air supplementing hole is formed in the connecting flue, and the fan is used for conveying air into the air supplementing hole. According to the invention, the afterburning system is additionally arranged before the flue gas enters the waste heat boiler, that is, the connecting flue is arranged to connect the vertical heat recovery coke oven and the waste heat boiler, and the air required by the combustion of the combustible gas is supplemented into the connecting flue through the fan, so that the heat carried by the combustible gas in the waste gas of the vertical heat recovery coke oven can be recycled. Meanwhile, corrosive gas in the waste gas is treated, corrosion to the heating surface of the waste heat boiler is avoided, and pipe explosion and leakage are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of boiler supplementary combustion, and in particular to a vertical heat recovery coke power waste heat boiler supplementary combustion system. Background Art

[0002] Vertical heat recovery coke oven refers to a coke production device that operates the coke oven carbonization chamber with a slight negative pressure, mechanized tamping, coal loading, coke discharge, and recycles the waste heat of coking combustion exhaust gas. It is mainly used to produce foundry coke. In practical applications, vertical heat recovery coke ovens and waste heat boilers are usually used in combination to further improve energy utilization and reduce environmental pollution.

[0003] Due to process reasons, the exhaust gas produced by vertical heat recovery coke ovens contains a certain concentration of combustible gases such as CH4, CO, and H2S. Direct use of waste heat boilers will cause serious corrosion to the boiler's pressure components. Summary of the invention

[0004] The object of the present invention is to provide a vertical heat recovery coke power waste heat boiler supplementary combustion system to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides a vertical heat recovery coke oven and waste heat boiler supplementary combustion system, which includes a vertical heat recovery coke oven and a waste heat boiler, and also includes a connecting flue and a fan, the two ends of the connecting flue are respectively connected to the flue gas outlet of the vertical heat recovery coke oven and the flue gas inlet of the waste heat boiler, the connecting flue is provided with a supplementary air hole, and the fan is used to transport air to the supplementary air hole.

[0006] Furthermore, the number of the supplementary air holes is multiple.

[0007] Furthermore, the fan is used to transport air into the furnace of the waste heat boiler.

[0008] Furthermore, the flue gas outlet of the waste heat boiler is connected to an external chimney.

[0009] Furthermore, a damper is provided between the waste heat boiler and the connecting flue.

[0010] Furthermore, a flue gas analysis instrument is provided on the connecting flue.

[0011] The beneficial effects of the present invention are as follows: the present invention can recycle the heat of the combustible gas in the exhaust gas of the vertical heat recovery coke oven by adding a supplementary combustion system before the flue gas enters the waste heat boiler, that is, setting a connecting flue to connect the vertical heat recovery coke oven and the waste heat boiler, and replenishing the air required for the combustion of the combustible gas into the connecting flue through a fan. At the same time, the corrosive gas in the exhaust gas is treated to avoid corrosion of the heating surface of the waste heat boiler to prevent pipe bursting and leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0013] Among them: 1. Vertical heat recovery coke oven; 2. Connecting flue; 3. Waste heat boiler; 4. Fan; 5. Chimney; 6. Air damper; 7. Main air supply pipe; 8. Branch air supply pipe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0015] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0017] like Figure 1 As shown, the present invention discloses a vertical heat recovery coke oven 1 and a waste heat boiler 3 supplementary combustion system, which includes a vertical heat recovery coke oven 1 and a waste heat boiler 3, and also includes a connecting flue 2 and a fan 4. The two ends of the connecting flue 2 are respectively connected to the flue gas outlet of the vertical heat recovery coke oven 1 and the flue gas inlet of the waste heat boiler 3, and a supplementary air hole is opened on the connecting flue 2, and the fan 4 is used to transport air to the supplementary air hole.

[0018] In the industrial production process, the vertical heat recovery coke oven 1 generates a large amount of waste gas, which contains a certain concentration of combustible gases, mainly CH4, CO, and H2S, and contains abundant heat energy. This system connects the flue 2 to connect the flue gas outlet of the vertical heat recovery coke oven 1 with the flue gas inlet of the waste heat boiler 3, so that the waste gas can smoothly enter the waste heat boiler 3. At the same time, before the flue gas enters the waste heat boiler 3, the supplementary combustion system injects an appropriate amount of air into the flue gas in the flue 2 through the supplementary air hole, so as to ignite the combustible components therein.

[0019] By burning the toxic and corrosive gases in the flue gas, they are converted into harmless or low-harmful substances, thereby reducing the emission of pollutants. This design can further increase the temperature and thermal efficiency of the flue gas, allowing the waste heat boiler 3 to operate more stably. In addition, it can also reduce the corrosion and wear of the boiler heating surface by the corrosive gases in the flue gas, so as to avoid bursting and leakage of pipes, and extend the service life of the waste heat boiler 3.

[0020] The present invention adds a supplementary combustion system before the flue gas enters the waste heat boiler 3, that is, a connecting flue 2 is provided to connect the vertical heat recovery coke oven 1 and the waste heat boiler 3, and the air required for the combustion of the combustible gas is supplemented into the connecting flue 2 by the fan 4, so that the heat carried by the combustible gas in the exhaust gas of the vertical heat recovery coke oven 1 can be recovered and utilized. At the same time, the corrosive gas in the exhaust gas is treated to avoid corrosion to the heating surface of the waste heat boiler 3, so as to avoid bursting and leakage of the pipe.

[0021] In one embodiment, the number of supplementary air holes is multiple. Multiple supplementary air holes can ensure that the combustible components in the flue gas are more fully burned. The increase in the number of supplementary air holes makes the air distribution more uniform and the combustion reaction more complete, thereby improving the combustion efficiency. More complete combustion means that the heat energy in the flue gas is more fully released. This heat energy can be more effectively absorbed and utilized by the waste heat boiler 3, thereby improving the heat energy recovery rate. In addition, the emission of pollutants in the flue gas can also be reduced. After the combustible components are completely burned, the amount of pollutants generated will be significantly reduced, which helps to protect the environment. At the same time, when an air hole is blocked or fails, the other air holes can still work normally to ensure the continuity and stability of the combustion process.

[0022] In practical applications, the number and layout of supplementary air holes can be determined according to specific production requirements and process conditions. For example, in situations where the flue gas flow is large or the combustion reaction is more intense, it may be necessary to increase the number of supplementary air holes to ensure the stability and efficiency of the combustion process.

[0023] In one embodiment, the fan 4 is used to transport air into the furnace of the waste heat boiler 3. That is, an air supply main pipe 7 and a plurality of air supply branch pipes 8 are provided, the air inlet of the air supply main pipe 7 is connected to the air outlet of the fan 4, and the air outlet pipes of the air supply main pipe 7 are respectively connected to the air inlets of the plurality of air supply branch pipes 8. The air outlets of the plurality of air supply branch pipes 8 are respectively connected to a plurality of supplementary air holes and the air inlet of the furnace of the waste heat boiler 3. Using one fan 4 as a unified air source can reduce system fluctuations caused by asynchronous operation or failure of multiple fans 4, and help maintain stable operation of the waste heat boiler 3 and the connecting flue 2.

[0024] This design provides sufficient oxygen for the combustion process in the waste heat boiler 3. This helps the combustible material burn more fully and release more heat energy. At the same time, it simplifies the structure of the system and reduces the number of equipment and maintenance costs.

[0025] In one embodiment, the flue gas outlet of the waste heat boiler 3 is connected to an external chimney 5 .

[0026] In one embodiment, a damper 6 is provided between the waste heat boiler 3 and the connecting flue 2. The opening of the damper 6 is adjusted according to actual production needs, thereby adjusting the flue gas flow entering the waste heat boiler 3.

[0027] In one embodiment, a flue gas analyzer is provided on the connecting flue 2 to measure the content of combustible gas in the post-combustion gas in real time. According to the gas composition data obtained by online detection, the air entering the connecting flue 2 can be controlled by adjusting the speed of the fan 4, thereby further ensuring the safety and stability of the waste heat boiler 3.

[0028] The design ideas of the present invention are as follows:

[0029] In this embodiment, a connecting flue 2 is arranged between the vertical heat recovery coke oven 1 and the waste heat boiler 3, a damper 6 is arranged between the connecting flue 2 and the waste heat boiler 3, a plurality of supplementary air holes are opened on the connecting flue 2, and the flue gas outlet of the waste heat boiler 3 is connected to the chimney 5. A fan 4 is arranged outside to deliver air to the furnace connecting the flue 2 and the waste heat boiler 3 through an air supply main pipe 7 and a plurality of air supply branch pipes 8.

[0030] That is, in the industrial production process, the vertical heat recovery coke oven 1 will generate a large amount of waste gas, and the waste gas generated contains a certain concentration of combustible gases, mainly CH4, CO, and H2S. Before the flue gas enters the waste heat boiler 3, a supplementary combustion system is set, that is, the fan 4 sprays an appropriate amount of air into the flue gas connected to the flue 2 through the supplementary air hole, so as to ignite the combustible components therein. Two to three groups of supplementary air points can be used. By burning the toxic and corrosive gases in the flue gas, they are converted into harmless or low-harmful substances, thereby reducing the emission of pollutants and improving the safety and stability of the waste heat boiler 3. According to actual production needs, the opening of the damper 6 is adjusted to adjust the flue gas flow entering the waste heat boiler 3. At the same time, the fan 4 transports air to the waste heat boiler 3, providing sufficient oxygen for the combustion process in the waste heat boiler 3. The flue gas after combustion in the waste heat boiler 3 is discharged through the chimney 5.

[0031] In the actual production process, a flue gas analyzer can also be set on the connecting flue 2 to measure the content of combustible gas in the post-combustion gas in real time. According to the gas composition data obtained by online detection, the air entering the connecting flue 2 can be controlled by adjusting the speed of the fan 4, thereby further ensuring the safety and stability of the waste heat boiler 3.

[0032] The present invention adds a supplementary combustion system before the flue gas enters the waste heat boiler 3, that is, a connecting flue 2 is provided to connect the vertical heat recovery coke oven 1 and the waste heat boiler 3, and the air required for the combustion of the combustible gas is supplemented into the connecting flue 2 by the fan 4, so that the heat carried by the combustible gas in the exhaust gas of the vertical heat recovery coke oven 1 can be recovered and utilized. At the same time, the corrosive gas in the exhaust gas is treated to avoid corrosion to the heating surface of the waste heat boiler 3, so as to avoid bursting and leakage of the pipe.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vertical heat recovery coke oven and waste heat boiler supplementary combustion system, comprising a vertical heat recovery coke oven and a waste heat boiler, characterized in that: It also includes a connecting flue and a fan, wherein the two ends of the connecting flue are respectively connected to the flue gas outlet of the vertical heat recovery coke oven and the flue gas inlet of the waste heat boiler, and a supplementary air hole is opened on the connecting flue, and the fan is used to transport air to the supplementary air hole.

2. A vertical heat recovery coke power waste heat boiler supplementary combustion system according to claim 1, characterized in that: The number of the supplementary air holes is plural.

3. A vertical heat recovery coke power waste heat boiler supplementary combustion system according to claim 1, characterized in that: The fan is used to transport air into the furnace of the waste heat boiler.

4. A vertical heat recovery coke power waste heat boiler supplementary combustion system according to claim 1, characterized in that: The flue gas outlet of the waste heat boiler is connected to an external chimney.

5. The vertical heat recovery coke power waste heat boiler supplementary combustion system according to claim 1 is characterized by: A damper is provided between the waste heat boiler and the connecting flue.

6. A vertical heat recovery coke power waste heat boiler supplementary combustion system according to claim 1, characterized in that: The connecting flue is provided with a flue gas analysis instrument.

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