TWI762408B - Method for burning-off deposited carbon inside coke oven - Google Patents

Abstract

A method for burning-off deposited carbon inside a coke oven is described, in which a coking oven door of a coking oven chamber is firstly replaced with an oven door for burning-off deposited carbon. The oven door for burning-off deposited carbon includes at least one opening. The opening is equipped with a movable baffle. The charging holes on the roof of coke oven chamber are opened. In addition, the opening of oven door is opened by using the movable baffle. Then, the outside air is introduced into the coke oven chamber from the opening by the natural convection method. The introduced air will spontaneously undergo a combustion reaction in the coke oven chamber to burn off the carbon deposits attached to the inner surface of coke oven. The generated hot flow will be discharged out of the coke oven chamber through the charging holes and the ascension pipe of the coke oven. Besides, the charging holes can be covered by the grid plates with different degrees of openings. By adjusting the opening degrees of the oven door and the grid plates, the flow volume of the air into the oven and the distribution of airflow in the chamber can be changed, thereby changing the burning rate and combustion site of the deposited carbon.

Description

Coke oven carbon deposit burning method

The present disclosure relates to a technology for burning off carbon deposits, and in particular, to a method for burning off carbon deposits in coke ovens.

The coke oven is made up of coke oven chambers and heating chambers which are alternately arranged at intervals. The coal is fed into the coke oven chamber from the top of the coke oven, and the heat required for coking is provided by the heating chambers on both sides. Coal is formed by thermal cracking and coking procedures. During the coking process, the furnace wall, furnace roof, and rising tube of the coke oven chamber will gradually adhere to carbon deposits. After the carbon deposit accumulates to a certain thickness, the gas production channel in the upper part of the furnace chamber will be partially blocked, resulting in fine coal powder and furnace gas escape pollution during the feeding and coking process; the coke pushing resistance increases during the coke pushing operation, and in severe cases. Causes the difficulty of pushing coke and accelerates the aging of the coke oven. Therefore, removing carbon deposits has always been one of the key tasks of coke oven maintenance.

Carbon deposits are mainly accumulated in the upper part of the coke oven. In the past, the coking field used manpower to scrape the carbon deposits near the feeding port with a shovel, which was quite labor-intensive. Or, use air natural convection to burn off the carbon deposits in the coke oven chamber. In this method, after the coke is pushed, the charging port cover is opened when the furnace is empty, and an air duct can be erected at the charging port on the top of the furnace. The duct is mainly used to isolate the bricks at the feeding port and the cold air to avoid cracking of the furnace bricks due to rapid cooling. Although this carbon deposit burning method is relatively easy to implement, the air flow and the temperature distribution of the furnace chamber are often uneven, and it is easy to form a stagnant area under part of the feeding port. As a result, it is not only difficult to burn off the carbon deposits, but also the burning rate of the carbon deposits is slow, the operation is time-consuming, the efficiency is not good, and it is more likely to cause high temperature damage to the furnace bricks.

One of the methods to improve the carbon deposit burning efficiency is to design an air lance nozzle and extend the air lance nozzle into the coke oven chamber to perform forced convection carbon deposit burning operation. However, the temperature of the furnace wall of the coke oven chamber is about 1200°C. If the air flow is insufficient, the air injection pipe is often damaged due to high radiation heat. If there is too much air, the bricks in the coke-free area in the coke oven chamber will be rapidly cooled, resulting in thermal shock. In addition, the air blowing volume is large, the system needs to be movable, and the design is more complicated with cumbersome air supply equipment. In addition, some carbon deposit removal equipments are designed to install the system on a coke pusher or a feeding vehicle. The air injection pipe needs to be able to automatically expand and retract to enter and exit the coke oven chamber, and the equipment is more complicated and expensive. Moreover, the carbon deposit burning equipment on the coke pushing car or the feeding car can only carry out the carbon deposit burning operation in a short period of about 2 minutes to 3 minutes after the coke pushing and before feeding, which lacks mobility. In high duty rate (higher furnace temperature) production, the time from coke pushing to feeding is urgent, but the formation of carbon deposits is accelerated due to high temperature, and the burning of carbon deposits may not be completed in time.

Therefore, an object of the present disclosure is to provide a method for burning coke deposits in a coke oven, wherein the furnace door for calcined carbon includes one or more openings, whereby external air can be removed from the furnace door for calcined carbon through natural convection. The opening of the coke oven chamber enters the coke oven chamber, and the hot air flow generated by the combustion reaction can be discharged from the rising pipe and the feeding port on the top of the coke oven chamber. Compared with the method of erecting air supply ducts at the furnace top feeding port, the method of inhaling through the opening of the furnace door can greatly increase the gravitational potential energy between the cold air inhaled and the hot air discharged from the furnace top rising pipe and the charging port. Therefore, the intake air volume of the coke oven chamber can be increased, thereby improving the efficiency of burning off carbon deposits in the coke oven chamber.

Another object of the present disclosure is to provide a method for burning coke deposits in a coke oven. External air can enter from below the coke oven chamber, and can be preheated to increase the reaction temperature, thereby accelerating the burning speed of the coke deposits in the upper part of the coke oven.

Another object of the present disclosure is to provide a method for burning coke deposits in a coke oven, which can adjust the opening of the furnace door and the opening of the shutter of the charging hole, thereby changing the air intake and the burning rate. In addition, the distribution of the airflow field in the coke oven chamber can be changed by adjusting the opening of the shutter of the charging hole, so as to burn off the carbon deposits in a specific position in the coke oven chamber, and the operation is quite flexible.

Another object of the present disclosure is to provide a method for burning coke deposits in a coke oven, which adopts a natural convection method, does not require additional air supply equipment, and has a simple design and low equipment and operating costs.

According to the above purpose of the present disclosure, a method for burning off carbon deposits in a coke oven is proposed. In this method, the coke oven door in the coke oven chamber is replaced by a coke oven door. The furnace door for burnt carbon includes at least one opening, and the at least one opening is equipped with a movable baffle plate. Several feeding ports of the coke oven chamber are opened, wherein these feeding ports are sequentially penetrated in the furnace roof of the coke oven chamber. At least one opening of the furnace door for burning carbon is opened through the movable baffle. External air is introduced into the coke oven chamber from the at least one opening by natural convection. The external air undergoes combustion reaction in the coke oven chamber to burn off the carbon deposits in the coke oven chamber, and generate hot air flow from the charging port and the riser pipe of the coke oven chamber to be discharged from the coke oven chamber.

According to an embodiment of the present disclosure, the number of at least one opening of the above-mentioned furnace door for burning carbon is several, and these openings are arranged in sequence along the height direction of the furnace door for burning carbon.

According to an embodiment of the present disclosure, before introducing the outside air into the coke oven chamber, one or more of the above-mentioned openings are opened.

According to an embodiment of the present disclosure, when a plurality of the above-mentioned openings are opened, the plurality of the openings have the same opening degree.

According to an embodiment of the present disclosure, when a plurality of the above-mentioned openings are opened, the plurality of the openings have different opening degrees from each other.

According to an embodiment of the present disclosure, opening the at least one opening includes controlling the opening degree of the at least one opening with a movable baffle plate.

According to an embodiment of the present disclosure, after opening the charging ports of the coke oven chamber, the method further includes covering the charging ports with a plurality of shutters, wherein each shutter has an opening.

According to an embodiment of the present disclosure, the opening degrees of the above-mentioned shutters are the same.

According to an embodiment of the present disclosure, the opening degrees of the above-mentioned shutters are different from each other.

According to an embodiment of the present disclosure, a part of the opening degrees of the above-mentioned shutters is the same, and another part is different.

According to an embodiment of the present disclosure, the above-mentioned coke oven door is located on the coke guide side or the coke push side of the coke oven chamber.

The principle of natural convection burning carbon deposit operation is to use the gravitational potential energy difference of cold and hot gases under normal pressure to allow air to freely flow into and out of the coke oven chamber where the combustion reaction is carried out. The conventional natural convection burning method of carbon deposition is to open a charging port on the top of the furnace to allow cold air to flow into the coke oven chamber. Of course, such a method of burning off carbon deposits has a limited amount of air intake, a slow burning rate of carbon deposits, and time-consuming operations.

Please refer to FIG. 1 , which is a three-dimensional schematic diagram of a coke oven chamber of a common coke oven. Generally speaking, the coke oven chamber 100 includes a plurality of charging ports 120 , 122 , 124 , and 126 , and a riser 130 . The coke oven chamber 100 has a length L, a width W, and a height T. The feeding ports 120 , 122 , 124 , 126 and the rising pipe 130 are all penetrated through the furnace roof 102 of the coke oven chamber 100 , and are in fluid communication with the interior of the coke oven chamber 100 . The coke oven chamber 100 has a coke leading side 140a and a coke pushing side 140b, wherein the coke leading side 140a and the coke pushing side 140b are respectively located on opposite sides in the length direction LD of the coke oven chamber 100 . The riser tube 130 is adjacent to the coke pushing side 140b, and the feeding ports 120, 122, 124, and 126 are sequentially arranged from the coke pushing side 140b along the length direction LD of the coke oven chamber 100 to the coke leading side 140a.

In general, the methods of increasing the burning rate of carbon deposits are mostly to increase the air volume or increase the air temperature. In the above-mentioned conventional natural convection burning carbon deposition method, the gravitational potential energy difference between the hot and cold gases is limited by the elevation difference between the outlet of the rising pipe 130 and the inlets of the feeding ports 120, 122, 124, and 126, increasing the air volume. The only way is to increase the area of the air inlet. However, under the normal pressure system, the intake air volume and the exhaust air volume need to be balanced, but when the cold air enters the coke oven chamber 100 and turns into hot air after combustion reaction, the volume will expand several times, causing the back pressure in the coke oven chamber 100 . In this way, even if the feeding ports 120, 122, 124, and 126 are increased, the increase in the intake air volume is still quite limited.

If all the feeding ports 120 , 122 , 124 , and 126 in the furnace roof 102 of the coke oven chamber 100 are opened to burn and deposit carbon, the balance result of the airflow field in the coke oven chamber 100 is that only the feeding port 120 close to the riser pipe 130 and 122 become the air inlets, and the air intakes of the feeding ports 120 and 122 are not equal, and the air intake volume of the feeding port 120 is higher than that of the feeding port 122 . The volume of the air after combustion expands, and more hot air outlets are required to maintain the system in the coke oven chamber 100 at normal pressure. At this time, the feeding ports 124 and 126 become exhaust ports. Moreover, most of the carbon deposits are accumulated in the upper part of the coke oven chamber 100, and the low-temperature airflow caused by the intake of cold air from the feeding ports 120, 122, 124, and 126 of the furnace top 102 will reduce the combustion reaction rate and reduce the efficiency of the carbon deposit burning. .

In view of this, the present disclosure proposes a method for removing carbon deposits in a coke oven. By designing a special furnace door for removing carbon deposits in a coke oven, the special furnace door has an opening whose opening degree can be adjusted, so as to utilize the natural atmosphere of the air. Convection can make the outside air suck into the coke oven chamber from the opening of the special furnace door, and after the combustion reaction, it will be discharged from the rising pipe and the charging port on the top of the furnace. Therefore, the gravitational potential energy difference between the cold and hot air can be increased, and the air intake can be greatly increased. Secondly, the cold air can be preheated through the coke oven chamber after entering from the lower part of the coke oven chamber, thereby increasing the combustion rate of carbon deposits and enhancing the effect of burning carbon deposits in the upper part of the coke oven chamber. Furthermore, this method adopts the natural convection method, so no additional air supply equipment is required, the overall equipment design is simple, and the equipment and operation costs are low. In addition, it can adjust the opening of the charging port on the top of the furnace and the opening of the furnace door or the selection of different openings to control the air intake and burn off the carbon deposits in specific positions in the coke oven chamber.

Please refer to FIG. 1 to FIG. 3 at the same time, wherein FIG. 2 is a flowchart illustrating a method for removing carbon deposits in a coke oven according to an embodiment of the present disclosure, and FIG. 3 illustrates a burning method according to an embodiment of the present disclosure. Front view of the furnace door for carbon deposits. When burning off the coke in the coke oven chamber 100 , step 200 may be performed first to replace the coke oven door 150 of the coke oven chamber 100 with the oven door 150 for burning the coke in FIG. 3 . The furnace door 150 for burnt carbon includes one or more openings. In the example shown in FIG. 3, the furnace door 150 for burning carbon includes two openings 160a and 160b. The openings 160a and 160b are arranged in order along the height direction HD of the furnace door 150 for burning carbon. The openings 160a and 160b are provided with respective movable baffles 170a and 170b. By moving the movable baffles 170a and 170b, the opening degrees of the openings 160a and 160b, that is, the opening area, can be adjusted respectively.

In some examples, the burnt carbon door 150 can be made by retrofitting an old coke oven door. When making the furnace door 150 for burnt carbon, the design of the hanging extraction element and the diaphragm sealing knife on the old coking furnace door can be retained, but one or more rectangular air intake openings are opened on the old coking furnace door. In this way, when the coke oven chamber 100 is burnt out, the coke oven door 100 for coke oven chamber 100 can be removed by a door puller, and then the coke oven door 150 can be suspended by the same door puller. The position where the coke oven door was originally installed in the coke oven chamber 100 . The coke oven door 150 replaced by the calcined coke oven door can be originally provided on the coke leading side 140 a or the coke pushing side 140 b of the coke oven chamber 100 . In some demonstrative examples, the coke oven door 150 replaces the coke oven door installed on the coke guide side 140a of the coke oven chamber 100 .

In other examples, the furnace door 150 for calcined carbon can be made not by modifying the old coke furnace door, but by closing the coke leading side 140a or the coke pushing side 140b of the coke oven chamber 100 and being equipped with a movable Furnace door with the design of the inlet opening of the baffle.

Step 210 may be performed to open a plurality of the charging ports 120 , 122 , 124 , and 126 of the coke oven chamber 100 . For example, all of the feed ports 120, 122, 124, and 126 may be opened. Alternatively, only three or two of the feeding ports 120 , 122 , 124 , and 126 may be opened according to the carbon deposition in the coke oven chamber 100 . In some examples, all of the feed ports 120, 122, 124, and 126 may be open, but the openings of the feed ports 120, 122, 124, and 126 may be different or different from each other. The opening degrees of the feeding ports 120 , 122 , 124 , and 126 can be adjusted according to the distribution of carbon deposits in the coke oven chamber 100 . For example, feed port 120 may be 30% open, feed port 122 may be 50% open, feed port 124 may be fully open ie 100% open, and feed port 126 may be 70% open.

Please refer to FIG. 4A to FIG. 4D , which are schematic diagrams of the shutters of four kinds of feeding ports according to an embodiment of the present disclosure, respectively. In some examples, after opening the feeding ports 120 , 122 , 124 , and 126 of the coke oven chamber 100 , a plurality of shutters 180 , 182 , 184 , and 186 can be correspondingly covered on the feeding ports 120 , 122 , 124 , and 124 , respectively. and 126, thereby adjusting the opening degree of the feeding ports 120, 122, 124, and 126. That is to say, each of the shutters 180, 182, 184, and 186 has its own opening, and the openings of the shutters 180, 182, 184, and 186 can determine the corresponding openings 120, 122, 124, and 126. opening.

In some instances, the shutters 180, 182, 184, and 186 all have the same opening. In other examples, the openings of the shutters 180, 182, 184, and 186 are different from each other. In still other examples, the openings of the shutters 180, 182, 184, and 186 are not all the same, and some of them are the same and others are different. For example, the openings of shutters 180 and 182 may be the same, while the openings of shutters 184 and 186 may be different from each other and from the openings of shutters 180 and 182 . Alternatively, the openings of shutters 180 and 182 may be the same, while the openings of shutters 184 and 186 may be the same but different from the openings of shutters 180 and 182 . Alternatively, the openings of the shutters 180 , 182 , and 184 may be the same, and the opening of the shutter 186 may be different from the openings of the shutters 180 , 182 , and 184 .

In some illustrative examples, the opening of shutter 180 may be 30%, the opening of shutter 182 may be 50%, the opening of shutter 184 may be 100%, and the opening of shutter 186 may be 70%. Thereby, the opening degrees of the corresponding feeding ports 120 , 122 , 124 , and 126 can be set to 30%, 50%, 100%, and 70%, respectively.

In some examples, cast iron grid plates can be used to coat iron sheets with different opening areas to make shutters with different opening degrees. For example, as shown in FIG. 4A , the shutter 180 may include a cast iron grid plate 180a and an iron sheet 180b, wherein the iron sheet 180b is coated on the cast iron grid plate 180a. As shown in FIG. 4B , the shutter 182 may include a cast iron grid plate 182a and an iron sheet 182b covering the cast iron grid plate 182a. As shown in FIG. 4C , the shutter 184 may include a cast iron grid plate 184a and an iron sheet 184b covering the cast iron grid plate 184a. As shown in FIG. 4D , the shutter 186 may be a shutter with an opening degree of 100%, so the shutter 186 may only include the cast iron grid plate 186a. In other examples, the shutter 186 can be a shutter with an opening degree other than 100%, and has a cast iron grid plate 186a and an iron sheet (not shown) covering it.

Next, step 220 may be performed to open the openings 160a and/or 160b of the furnace door 150 for carbon deposition through the movable baffles 170a and/or 170b. The sequence of step 220 and the above-mentioned step 210 of opening the feeding ports 120 , 122 , 124 , and 126 can be adjusted according to the actual operation requirements on site. Only opening 160a or 160b may be opened, or both openings 160a and 160b may be opened. When opening the openings 160a and 160b of the furnace door 150 for burning carbon, the openings of the openings 160a and 160b can be controlled by the movable baffles 170a and 170b, respectively.

In some examples, when the plurality of openings 160a and 160b of the furnace door 150 for burning carbon are opened, the opened openings 160a and 160b have the same opening degree. In other examples, when the plurality of openings 160a and 160b of the furnace door 150 for burning carbon are opened, the opened openings 160a and 160b have different opening degrees from each other.

Next, step 230 may be performed to introduce external air into the coke oven chamber 100 from the openings 160a and/or 160b by means of natural convection. The external air entering the coke oven chamber 100 can undergo a combustion reaction in the coke oven chamber 100 to burn off carbon deposits in the coke oven chamber 100 . The external air generates hot air after the combustion reaction, and the hot air can be discharged from the coke oven chamber 100 from the charging ports 120 , 122 , 124 , and 126 of the furnace roof 102 of the coke oven chamber 100 and the riser pipe 130 .

Since the outside air enters the coke oven chamber 100 through the openings 160a and/or 160b of the furnace door 150 for calcined carbon, the elevation difference between the outlet of the riser pipe 130 for exhaust gas and the openings 160a and/or 160b for intake air may It is greatly increased, and the rising pipe 130 of the furnace top 102 and the feeding ports 120, 122, 124, and 126 can all be used as discharge ports for the hot gas flow. Since the gravitational potential energy difference between the hot and cold air increases, and the area of the exhaust port also increases, the outside air intake can be increased. In addition, the outside air is sucked into the coke oven chamber 100 from below the furnace roof 102 of the coke oven chamber 100 , for example, the openings 160 a and/or 160 b closer to the bottom of the coke oven chamber 100 , and the sucked cold air can be in the coke oven chamber 100 . The return flow goes up, so that the temperature of the airflow can be gradually increased. The preheated air in this way can speed up the combustion speed, thereby improving the efficiency of burning carbon deposits in the coke oven chamber 100 .

In accordance with the shutters 180 , 182 , 184 , and 186 of different opening degrees of the furnace roof 102 , the amount of air sucked into the coke oven chamber 100 and the burning position of carbon deposits in the coke oven chamber 100 can be adjusted and controlled. Please refer to FIGS. 5A to 5C , which are flow rate distribution diagrams of the natural convection air intake with different openings of the feeding port, full opening of the feeding port, and 20% opening of the feeding port, respectively, according to an embodiment of the present disclosure. In FIGS. 5A to 5C , the furnace door 150 for burning carbon is installed on the coke leading side 140 a of the coke oven chamber 100 , and only one lower opening 160 a is opened to suck in cool air. In the operation mode of FIG. 5A , the opening degree of the feeding port 120 is 30%, the opening degree of the feeding port 122 is 50%, the opening degree of the feeding port 124 is 100%, and the opening degree of the feeding port 126 is 70%. Compared with the operation mode of FIG. 5A , when the charging ports 120 , 122 , 124 , and 126 of the furnace top 102 are fully opened, the flow velocity of the airflow below the coke oven chamber 100 of FIG. 5B increases, and the air intake increases. In contrast, when the openings of the feeding ports 120, 122, 124, and 126 are all limited to 20%, the flow rate of the airflow below the coke oven chamber 100 in FIG. 5C decreases, and the intake air volume decreases sharply.

If it is assumed that the carbon deposits are only distributed in the upper 1/3 area of the furnace, the natural convection carbon deposit burning operation mode of the inlets 120, 122, 124, and 126 of the furnace top 102 is used as the benchmark. The comparison of the average soot burning rate in the coke oven chamber 100 of the three operating modes of 5C is shown in Table 1 below. Table I work mode Openings of feeding ports 122, 122, 124, and 126 Carbon burning rate (kmole/m ² *s) Relative burn rate Feed inlet air 30%, 50%, 100%, 70% 0.049 1 Opening under the furnace door 20%, 20%, 20%, 20% 0.043 0.87 Opening under the furnace door 30%, 50%, 100%, 70% 0.126 2.57 Opening under the furnace door Opening is 100% 0.155 3.16

In the operation mode shown in FIG. 5A , because the openings of the feeding ports 124 and 126 are relatively large, the burning rate of carbon deposits near the feeding ports 124 and 126 is relatively high. In the operation mode of FIG. 5C , since the openings of the feeding ports 120 , 122 , 124 , and 126 are all limited to 20%, the rising pipe 130 is mainly used for exhaust gas, so the burning rate of the carbon deposits under the rising pipe 130 is Highest.

In addition, it can be seen from Table 1 that if the feeding opening of the furnace top 102 is large enough, the carbon deposition burning efficiency of the intake air from below the furnace door 150 for burning carbon, that is, the opening 160a is significantly higher than that from the feeding port 120 of the furnace top 102 , 122, 124, and 126 air intake natural convection operating mode. The operation mode of the feeding ports 120 , 122 , 124 , and 126 in FIG. 5B with 100% opening is the mode with the largest air intake of the system, so the average carbon deposit burning rate in the coke oven chamber 100 is also the highest. To further speed up the burning efficiency of carbon deposits in the coke oven chamber 100, the opening 160b of the furnace door 150 for burning carbon can be opened to inhale more air.

As can be seen from the above-mentioned embodiments, one of the advantages of the present disclosure is that the furnace door for burning carbon of the present disclosure includes one or more openings, whereby outside air can enter through the opening of the furnace door for burning carbon through natural convection. In the coke oven chamber, the hot air flow generated by the combustion reaction can be discharged from the rising pipe and the feeding port on the top of the coke oven chamber. Compared with the method of erecting air supply ducts at the furnace top feeding port, the method of inhaling through the opening of the furnace door can greatly increase the gravitational potential energy between the cold air inhaled and the hot air discharged from the furnace top rising pipe and the charging port. Therefore, the intake air volume of the coke oven chamber can be increased, thereby improving the efficiency of burning off carbon deposits in the coke oven chamber.

Another advantage of the present disclosure is that in the method for removing carbon deposits in a coke oven of the present disclosure, external air can enter from below the coke oven chamber, and can be preheated to increase the reaction temperature, thereby accelerating the combustion of carbon deposits in the upper part of the coke oven speed.

Another advantage of the present disclosure is that in the method for removing carbon deposits in a coke oven of the present disclosure, the opening of the furnace door and the opening of the shutter of the charging hole can be adjusted, thereby changing the air intake and the burning rate. In addition, the distribution of the airflow field in the coke oven chamber can be changed by adjusting the opening of the shutter of the charging hole, so as to burn off the carbon deposits in a specific position in the coke oven chamber, and the operation is quite flexible.

Another advantage of the present disclosure is that the natural convection method is adopted in the coke oven coke burning method of the present disclosure, so no additional air supply equipment is required, the whole equipment is simple in design, and the equipment and operation costs are low.

Although the present disclosure has been disclosed above with examples, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the appended patent application.

100: Coke oven chamber 102: Stove top 120: Feeding port 122: Feeding port 124: Feeding port 126: Feeding port 130: Rising tube 140a: Focus guide side 140b: push focus side 150: Furnace door for burnt carbon 160a: Opening 160b: Opening 170a: Movable baffle 170b: Movable baffle 180: Shutter 180a: Cast iron grid plate 180b: Iron Sheet 182: Shutter 182a: Cast iron grid plate 182b: iron sheet 184: Shutter 184a: Cast iron grid plate 184b: Iron Sheet 186: Shutter 186a: Cast iron grid plate 200: Steps 210: Steps 220: Steps 230: Steps HD: Height direction L: long LD: length direction T: high W: wide

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows: [Fig. 1] is a three-dimensional schematic diagram showing a coke oven chamber, one of the common coke ovens; [ Fig. 2 ] is a flow chart illustrating a method for burning off carbon deposits in a coke oven according to an embodiment of the present disclosure; [ Fig. 3 ] is a front view showing a furnace door for burned carbon according to an embodiment of the present disclosure; [ FIG. 4A ] is a schematic diagram illustrating a shutter of a feeding port according to an embodiment of the present disclosure; [ FIG. 4B ] is a schematic diagram illustrating a shutter of a feeding port according to an embodiment of the present disclosure; [ FIG. 4C ] is a schematic diagram illustrating a shutter of a feeding port according to an embodiment of the present disclosure; [ FIG. 4D ] is a schematic diagram illustrating a shutter of a feeding port according to an embodiment of the present disclosure; [ FIG. 5A ] is a flow velocity distribution diagram of the natural convection air intake with different openings of the feeding port according to an embodiment of the present disclosure; [ FIG. 5B ] is a flow velocity distribution diagram of a natural convection air intake with a fully open feeding port according to an embodiment of the present disclosure; and [ FIG. 5C ] is a flow velocity distribution diagram of the natural convection air intake with each feeding port opened by 20% according to an embodiment of the present disclosure.

Domestic storage information (please note in the order of storage institution, date and number) none Foreign deposit information (please note in the order of deposit country, institution, date and number) none

200: Steps

210: Steps

220: Steps

230: Steps

Claims (11)

A method for burning off carbon deposits in a coke oven, comprising: A furnace door for burning carbon is used to replace one of the furnace doors for coking in a coke oven chamber, wherein the furnace door for burning carbon includes at least one opening, and each of the at least one opening is equipped with a movable baffle; Opening a plurality of feeding ports of the coke oven chamber, wherein the feeding ports are sequentially arranged in the furnace roof of the coke oven chamber; Open the at least one opening of the furnace door for burning carbon through the movable baffle; and A natural convection method is used to introduce an external air into the coke oven chamber from the at least one opening, wherein the external air undergoes a combustion reaction in the coke oven chamber to burn off carbon deposits in the coke oven chamber and generate a hot air flow The coke oven chamber is discharged from the feed openings and a riser pipe of the coke oven chamber. The method for removing carbon deposits in a coke oven as claimed in claim 1, wherein the number of the at least one opening of the furnace door for burned carbon is plural, and the openings are along a height direction of the furnace door for burned carbon Set in order. The method for burning coke deposits in a coke oven as claimed in claim 2, wherein before the outside air is introduced into the coke oven chamber, one or more of the openings are opened. The method for removing carbon deposits in a coke oven according to claim 3, wherein when opening the plurality of the openings, the plurality of the openings have the same opening degree. The method for removing carbon deposits in a coke oven according to claim 3, wherein when opening the plurality of the openings, the plurality of the openings have a plurality of opening degrees different from each other. The method for burning off carbon deposits in a coke oven as claimed in claim 1, wherein opening the at least one opening comprises using the movable baffle to control an opening degree of the at least one opening. The method for removing carbon deposits in a coke oven as claimed in claim 1, wherein after opening the feeding ports of the coke oven chamber, further comprising covering the feeding ports with a plurality of shutters, wherein each of the shutters Has a degree of opening. The method for removing carbon deposits in a coke oven according to claim 7, wherein the opening degrees of the shutters are the same. The method for removing carbon deposits in a coke oven according to claim 7, wherein the opening degrees of the shutters are different from each other. The method for removing carbon deposits in a coke oven as claimed in claim 7, wherein a part of the opening degrees of the shutters is the same, and the other part is different. The method for burning coke deposits in a coke oven as claimed in claim 1, wherein the coke oven door is located on a coke guide side or a coke push side of the coke oven chamber.

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