Heat recovery test coke oven

Abstract

The invention provides a heat recovery test coke oven, and relates to the technical field of coke oven equipment, the heat recovery test coke oven comprises a carbonization chamber, a combustion chamber, a descending flame path, an ascending flame path and an oven body, the carbonization chamber is provided with a carbonization cavity and a primary air inlet and an airflow outlet communicated with the carbonization cavity, and the carbonization chamber is suitable for coking feed coal; the top wall of the combustion chamber is in contact with the bottom wall of the carbonization chamber and can generate heat transfer, and the combustion chamber is provided with a combustion cavity and a secondary air inlet communicated with the combustion cavity; the descending flame path and the ascending flame path are arranged on the two opposite sides of the carbonization chamber in the first direction respectively and communicate with the combustion cavity, the descending flame path is provided with an air inlet communicating with the airflow outlet, and the ascending flame path is provided with a smoke outlet; the furnace body is provided with a containing cavity, the carbonization chamber, the combustion chamber, the descending flame path and the ascending flame path are all installed in the containing cavity, and the first direction is perpendicular to the height direction of the furnace body. The coking chamber and the combustion chamber are arranged separately, the experimental coking effect is good, and the problem of burning loss of coking coal easily caused by improper coking operation in the same chamber can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of coke oven equipment technology, and in particular to a heat recovery experimental coke oven. Background Technology

[0002] Heat recovery coke ovens are a type of coke production equipment. They utilize the slight negative pressure in the coke oven's carbonization chamber to recover and utilize waste heat from flue gas through mechanized processes such as compaction, coal charging, and coke discharging. Heat recovery coke ovens are characterized by low energy consumption, low pollution, short process flow, rapid construction, simple operation, and low operating costs, and are therefore widely used in the coking industry.

[0003] Currently, there is no market for small experimental coke ovens for heat recovery that are used to simulate and study the coal coking process in heat recovery coke ovens and to evaluate the pyrolysis characteristics of raw coal and the quality of coke. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a heat recovery test coke oven, which separates the carbonization chamber and the combustion chamber, resulting in good coking performance and effectively avoiding the problem of coking coal loss caused by improper coking operation in the same chamber.

[0006] According to an embodiment of the present invention, a heat recovery test coke oven includes a carbonization chamber, a combustion chamber, a descending flue, an ascending flue, and a furnace body.

[0007] The carbonization chamber has a carbonization cavity and a primary air inlet and an airflow outlet connected to the carbonization cavity. The carbonization cavity is suitable for coking raw coal. The top wall of the combustion chamber is in contact with the bottom wall of the carbonization chamber and heat transfer can occur. The combustion chamber has a combustion cavity and a secondary air inlet communicating with the combustion cavity. The descending fire channel and the ascending fire channel are respectively located on opposite sides of the carbonization chamber along the first direction and are both connected to the combustion chamber. The descending fire channel is provided with an air inlet connected to the airflow outlet, and the ascending fire channel is provided with a flue gas outlet. The furnace body has a accommodating cavity, and the carbonization chamber, the combustion chamber, the descending fire channel, and the ascending fire channel are all installed in the accommodating cavity. The first direction is perpendicular to the height direction of the furnace body.

[0008] According to an embodiment of the present invention, the heat recovery test coke oven integrates the carbonization chamber, combustion chamber, descending flue, and ascending flue in the accommodating cavity of the furnace body to construct a heat recovery test coke oven structure. The carbonization chamber and combustion chamber are arranged in separate chambers along the vertical direction, allowing heat transfer between them. Simultaneously, the descending flue and ascending flue are located on opposite sides of the carbonization chamber and communicate with the combustion chamber, thus forming a surrounding heat source on the outer periphery of the carbonization chamber to achieve heat preservation. This ensures that the raw coal can be well coked within the carbonization chamber. Therefore, compared to related technologies, the present invention separates the carbonization chamber and combustion chamber, resulting in better coking performance and effectively avoiding the problem of coking coal burnout caused by improper operation in the same chamber.

[0009] In some embodiments, the carbonization chamber extends along a second direction, the second direction, the first direction, and the height direction of the furnace body are mutually perpendicular, the height direction of the carbonization chamber is consistent with the height direction of the furnace body, the height of the carbonization chamber is h, and the width of the carbonization chamber along the first direction is a, where a > h.

[0010] In some embodiments, at least one of the descending fire channel and the ascending fire channel is in contact with the sidewall of the carbonization chamber and heat transfer can occur.

[0011] In some embodiments, at least a portion of each of the descending fire channel and the ascending fire channel extends out of the top wall of the furnace body; The heat recovery test coke oven also includes an explosion-proof plate, which is installed on top of the descending fire channel to cover the top opening of the descending fire channel.

[0012] In some embodiments, the primary air inlet extends along the height direction of the furnace body and is higher than the airflow outlet in the height direction of the furnace body.

[0013] In some embodiments, the descending fire channel extends along the height direction of the furnace body, and the secondary air inlet is connected to the combustion chamber along the first direction.

[0014] In some embodiments, the heat recovery test coke oven further includes a first temperature measuring thermocouple and a second temperature measuring thermocouple, wherein the temperature measuring ends of the first temperature measuring thermocouple and the second temperature measuring thermocouple are both located in the carbonization chamber, the first temperature measuring thermocouple is adapted to measure the temperature of the raw coal, and the second temperature measuring thermocouple is adapted to measure the temperature of the carbonization chamber.

[0015] In some embodiments, the top wall of the carbonization chamber is provided with a through hole extending along the height direction of the furnace body. The through hole is located at the center of the top wall of the carbonization chamber. The first temperature measuring thermocouple is slidably engaged with the through hole so that the measuring end of the first temperature measuring thermocouple can be inserted into the center of the raw coal to monitor the temperature.

[0016] In some embodiments, the heat recovery test coke oven further includes a third temperature measuring thermocouple, the temperature measuring end of which is located in the combustion chamber, and the third temperature measuring thermocouple is adapted to measure the temperature of the combustion chamber.

[0017] In some embodiments, the heat recovery test coke oven further includes a fourth temperature measuring thermocouple, the temperature measuring end of which is located at the flue gas outlet, and the fourth temperature measuring thermocouple is adapted to measure the temperature of the flue gas flowing out of the oven body.

[0018] In some embodiments, the heat recovery test coke oven further includes an upper heating zone located in the accommodating cavity, wherein the bottom wall of the upper heating zone is in contact with the top wall of the carbonization chamber and heat transfer can occur between them.

[0019] In some embodiments, the heat recovery test coke oven further includes a lower heating zone located in the accommodating cavity, wherein the top wall of the lower heating zone is in contact with the bottom wall of the combustion chamber and heat transfer can occur between them.

[0020] In some embodiments, the heat recovery test coke oven includes the upper heating zone and the lower heating zone; Both the upper heating zone and the lower heating zone are provided with heating chambers and include silicon carbide rods and temperature-controlled thermocouples. The heating chamber of the upper heating zone can transfer heat to the carbonization chamber, and the heating chamber of the lower heating zone can transfer heat to the combustion chamber. There are multiple silicon carbide rods arranged at intervals in the heating chambers, and the temperature measuring end of the temperature-controlled thermocouple is located in the heating chamber.

[0021] In some embodiments, both the upper heating zone and the lower heating zone further include ceramic sleeves, which are sleeved on the silicon carbide rods. There are multiple ceramic sleeves, each corresponding to one of the silicon carbide rods.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of a heat recovery test coke oven according to an embodiment of the present invention.

[0024] Figure 2 This is a side view of a heat recovery test coke oven according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the connection structure between the first temperature measuring thermocouple and the coal cake in a heat recovery test coke oven according to an embodiment of the present invention.

[0026] Figure 4This is a schematic diagram of the connection structure between the carbonization chamber and the second thermocouple in the heat recovery test coke oven according to an embodiment of the present invention (wherein a coal cake is placed in the carbonization chamber).

[0027] Figure 5 This is a schematic diagram of the connection structure between the carbonization chamber, combustion chamber, descending flue, and ascending flue in a heat recovery test coke oven according to an embodiment of the present invention (wherein coal cakes are placed in the carbonization chamber).

[0028] Figure 6 This is a schematic diagram of the connection structure of the carbonization chamber, combustion chamber, descending fire channel, ascending fire channel, upper heating zone and lower heating zone in a heat recovery test coke oven according to an embodiment of the present invention (wherein coal cake is placed in the carbonization chamber).

[0029] Reference numerals: 1. Carbonization chamber; 11. Carbonization cavity; 12. Primary air inlet; 13. Air outlet; 14. First temperature measuring thermocouple; 15. Second temperature measuring thermocouple; 2. Combustion chamber; 21. Combustion cavity; 22. Secondary air inlet; 23. Third temperature measuring thermocouple; 3. Downward fire channel; 31. Air inlet; 32. Explosion-proof plate; 4. Upward fire channel; 41. Flue gas outlet; 42. Fourth temperature measuring thermocouple; 5. Furnace body; 6. Upper heating zone; 61. Heating cavity; 62. Silicon carbide rod; 63. Temperature control thermocouple; 64. Ceramic sleeve; 7. Lower heating zone. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1 to 5 As shown, an embodiment of the present invention provides a heat recovery experimental coke oven, comprising a carbonization chamber 1, a combustion chamber 2, a descending flue 3, an ascending flue 4, and a furnace body 5. The carbonization chamber 1 has a carbonization cavity 11 and a primary air inlet 12 and an air outlet 13 communicating with the carbonization cavity 11. The carbonization cavity 11 is suitable for coking raw coal. The top wall of the combustion chamber 2 is in contact with the bottom wall of the carbonization chamber 1 and heat transfer can occur. The combustion chamber 2 has a combustion cavity 21 and a secondary air inlet 22 communicating with the combustion cavity 21. The descending flue 3 and the ascending flue 4 are respectively located on opposite sides of the carbonization chamber 1 along a first direction and are both communicating with the combustion cavity 21. The descending flue 3 has an air inlet 31 communicating with the air outlet 13, and the ascending flue 4 has a flue gas outlet 41. The furnace body 5 has a receiving cavity, and the carbonization chamber 1, the combustion chamber 2, the descending flue 3, and the ascending flue 4 are all installed in the receiving cavity. The first direction is perpendicular to the height direction of the furnace body 5.

[0032] According to an embodiment of the present invention, the heat recovery test coke oven integrates the carbonization chamber 1, the combustion chamber 2, the descending fire channel 3, and the ascending fire channel 4 in the accommodating cavity of the furnace body 5 to construct a heat recovery test coke oven structure. The carbonization chamber 1 and the combustion chamber 2 are arranged in separate chambers along the vertical direction, and heat can be transferred between them. At the same time, the descending fire channel 3 and the ascending fire channel 4 are respectively located on both sides of the carbonization chamber 1 and connected to the combustion chamber 21, so that surrounding heat energy can be formed on the outer periphery of the carbonization chamber 1 to achieve heat preservation of the carbonization chamber 1, so that the raw coal can be well coked in the carbonization chamber 11. Therefore, compared with related technologies, the present invention sets the carbonization chamber 1 and the combustion chamber 2 in separate chambers, resulting in better coking effect and effectively avoiding the problem of coking coal loss caused by improper coking operation in the same chamber.

[0033] Understandably, the introduction of combustion-supporting gas (such as air) into the carbonization chamber 11 through the primary air inlet 12 allows the combustion-supporting gas to mix with the raw coal gas produced after heating and undergo incomplete combustion, generating primary flue gas (including raw coal gas and flue gas generated after incomplete combustion of raw coal gas and combustion-supporting gas). The primary flue gas enters the descending flue 3 from the air outlet 13 through the air inlet 31, and enters the combustion chamber 21 along the descending flue 3. It mixes with the combustion-supporting gas introduced through the secondary air inlet 22 in the combustion chamber 21 and undergoes complete combustion, forming secondary flue gas. The heat energy generated during combustion is transferred to the carbonization chamber 11 through the combustion chamber 21, providing a heat source for the coking of the raw coal in the carbonization chamber 11. The secondary flue gas then enters the ascending flue 4 until it is discharged from the flue gas outlet 41, thereby realizing the experimental coking of the raw coal in the carbonization chamber 1.

[0034] Specifically, the first direction can be the left-right direction shown in the figure. The height direction of the furnace body 5 can be the up-down direction shown in the figure. The carbonization chamber 1 can be provided with an inlet and outlet that communicate with the carbonization cavity 11, so that raw coal can be put into the carbonization cavity 11 through the inlet and outlet, or coke (i.e., coked raw coal) can be taken out through the inlet and outlet. The furnace body 5 is also provided with a furnace door, which corresponds to the inlet and outlet and is used to close the inlet and outlet. The carbonization chamber 1 is located above the combustion chamber 2. The descending fire channel 3 is located on the left side of the carbonization chamber 1, and the ascending fire channel 4 is located on the right side of the carbonization chamber 1. The primary air inlet 12 can be located on the top wall of the carbonization chamber 1. The air outlet 13 can be opened on the side wall of the carbonization chamber 1 arranged along the first direction, that is, on the left side wall of the carbonization chamber 1 in the figure. The air inlet 31 can be opened on the side wall of the descending fire channel 3 adjacent to the airflow outlet 13, that is, on the right side wall of the descending fire channel 3 in the figure, and the air inlet 31 can be seamlessly connected with the airflow outlet 13 so that the primary flue gas can flow from the carbonization chamber 11 into the descending fire channel 3.

[0035] It should be noted that the raw coal is not limited to coal cakes. Coal cakes are square cake-shaped structures formed by compacting a certain mass of raw coal into a pre-set bulk density using a specialized compaction device. The bulk density of the compacted coal cake is an important indicator for evaluating its stability and its impact on coke quality; increasing the bulk density of the coal cake can improve coke quality.

[0036] In addition, since the flue gas outlet 41 of the rising flue 4 is generally equipped with a negative pressure device, a slight negative pressure can be formed in the rising flue 4 and the falling flue 3 to promote the flow of primary and secondary flue gas between the carbonization chamber 11, the falling flue 3, the combustion chamber 21 and the rising flue 4.

[0037] like Figures 1 to 4 As shown, in some embodiments, the carbonization chamber 1 extends along the second direction, and the second direction, the first direction and the height direction of the furnace body 5 are perpendicular to each other. The height direction of the carbonization chamber 1 is consistent with the height direction of the furnace body 5. The height of the carbonization cavity 11 is h, and the width of the carbonization cavity 11 along the first direction is a, where a > h.

[0038] It is understandable that, since the width-to-height ratio of the carbonization chamber 11 is greater than 1, coal cakes with a width-to-height ratio greater than 1 can be placed in the carbonization chamber 11 to effectively avoid the destructive effect of the expansion pressure of the coal cakes on the walls of the carbonization chamber 1 during the coking test, thereby improving the coking effect of the carbonization chamber 1.

[0039] Specifically, the coal cake is slidably fitted into the carbonization chamber 11, and can extend along a second direction. The height direction of the coal cake is consistent with the height direction of the carbonization chamber 11, and the ratio between the width and height of the coal cake is greater than 1. The width direction of the coal cake is the first direction. The second direction can be the front-back direction shown in the figure. To further reduce the damage to the walls of the carbonization chamber 1 caused by the expansion pressure of the coal cake during the coking test, the coal cake can be spaced apart from the inner top wall of the carbonization chamber 11 in the height direction of the furnace body 5, and spaced apart from the inner side wall of the carbonization chamber 11 in the first direction. The specific distance between the two can be designed according to the specific specifications of the carbonization chamber 11 and the estimated expansion amount of the coal cake, so as to ensure that the coal cake placed in the carbonization chamber 11 does not damage the walls of the carbonization chamber 1 during the coking process. This will not be elaborated further here.

[0040] It should be noted that in related technologies, the carbonization chamber 11 in heat recovery coke ovens is mostly a long strip extending vertically. Therefore, the coal cake placed in the carbonization chamber 11 for coking is also mostly long strips, that is, the width-to-height ratio of the coal cake is less than 1. During the coking test, the coal cake is more likely to expand in the left-right direction (i.e., its width direction), causing the coal cake to squeeze the furnace wall of the carbonization chamber 11, resulting in damage to the furnace wall and making coke discharge difficult. However, the coal cake in this invention has a width-to-height ratio greater than 1, and because the carbonization chamber 11 is spaced further apart from the upper surface of the coal cake in the height direction, it is less likely to damage the wall of the carbonization chamber 1 when it expands vertically.

[0041] like Figures 1 to 5 As shown, in some embodiments, at least one of the descending fire channel 3 and the ascending fire channel 4 is in contact with the side wall of the carbonization chamber 1 and heat transfer can occur.

[0042] That is, in some embodiments of the present invention, the descending fire channel 3 is in contact with the side wall of the carbonization chamber 1 and heat transfer can occur; in other embodiments, the ascending fire channel 4 is in contact with the side wall of the carbonization chamber 1 and heat transfer can occur; in still other embodiments, both the descending fire channel 3 and the ascending fire channel 4 are in contact with the side wall of the carbonization chamber 1 and heat transfer can occur. Therefore, the arrangement scheme of the descending fire channel 3, the ascending fire channel 4 and the carbonization chamber 1 of the present invention can be the aforementioned three schemes respectively.

[0043] Understandably, by adopting the above structure, the integration between the descending flue 3, the ascending flue 4, and the carbonization chamber 1 can be improved, so that the primary flue gas and the secondary flue gas can form a thermal energy ring on the outer periphery of the carbonization chamber 1, which can ensure the constant temperature performance of the carbonization chamber 1 to a certain extent. At the same time, it also utilizes the heat energy in heat recovery and improves the energy utilization efficiency.

[0044] Specifically, the right side wall of the descending fire channel 3 can abut against the left side wall of the carbonization chamber 1. The left side wall of the ascending fire channel 4 can abut against the right side wall of the carbonization chamber 1.

[0045] like Figures 1 to 5 As shown, in some embodiments, at least a portion of each of the descending flue 3 and the ascending flue 4 extends out of the top wall of the furnace body 5. The heat recovery test coke oven also includes an explosion-proof plate 32, which is installed on top of the descending flue 3 to cover the top opening of the descending flue 3. The explosion-proof plate 32 is detachably connected to the descending flue 3.

[0046] It is understandable that extending the descending fire channel 3 out of the top wall of the furnace body 5 facilitates the installation of the explosion-proof plate 32 on its top and makes it easier to maintain and inspect the descending fire channel 3 later. Extending the ascending fire channel 4 out of the top wall of the furnace body 5 facilitates its connection with subsequent devices (such as negative pressure devices). In addition, the explosion-proof plate 32 can prevent the risk of damage to the test coke oven caused by the huge expansion force generated by the raw coal gas in the carbonization chamber 11 when it encounters air during the test.

[0047] It should be noted that, since the top wall of the furnace body 5 generally has a high temperature (both primary and secondary flue gas are high-temperature gases, which will result in a high temperature at the top of the descending flue 3 and the ascending flue 4, and thus a high temperature near the top wall of the furnace body 5), in order to facilitate later maintenance operations, the top of the descending flue 3 and the ascending flue 4 should be designed to be a certain height above the top wall of the furnace body 5 to reduce the impact of high temperature on maintenance operations.

[0048] like Figures 1 to 5 As shown, in some embodiments, the primary air inlet 12 extends along the height direction of the furnace body 5, and the primary air inlet 12 is higher than the airflow outlet 13 in the height direction of the furnace body 5.

[0049] It is understandable that since the combustion-supporting gas enters the carbonization chamber 11 vertically through the primary air inlet 12, it can have a certain impact on the raw coal gas that escapes from the coal cake in the carbonization chamber 11 when heated. This can promote the mixing between the raw coal gas and the combustion-supporting gas, so that the combustion distribution of the two in the carbonization chamber 11 is more uniform, thereby ensuring the coking quality of the coal cake.

[0050] Specifically, at least a portion of the primary air inlet 12 extends out of the top wall of the furnace body 5, and the combustion-supporting gas enters the carbonization chamber 11 from top to bottom through the primary air inlet 12.

[0051] like Figures 1 to 5 As shown, in some embodiments, the descending fire channel 3 extends along the height direction of the furnace body 5, and the secondary air inlet 22 is connected to the combustion chamber 21 along the first direction.

[0052] It is understandable that because the descending flue 3 extends in the vertical direction, the primary flue gas can enter the combustion chamber 21 from top to bottom, while the secondary air inlet 22 injects combustion-supporting gas into the combustion chamber 21 in the horizontal direction. At this time, the primary flue gas and the combustion-supporting gas meet at a perpendicular angle in the combustion chamber 21, which enhances the impact between the primary flue gas and the combustion-supporting gas, allowing them to mix fully, improving the mixing efficiency and uniformity, and enabling full combustion between the two, resulting in higher thermal energy utilization efficiency.

[0053] Specifically, the rising flue 4 can also extend along the height direction of the furnace body 5. The bottom of both the descending flue 3 and the bottom of the rising flue 4 can be connected to the top of the combustion chamber 21. The secondary air inlet 22 can extend along a first direction. The combustion chamber 21 can also extend along a second direction.

[0054] like Figures 1 to 5 As shown, in some embodiments, the heat recovery test coke oven further includes a first temperature measuring thermocouple 14 and a second temperature measuring thermocouple 15. The temperature measuring ends of the first temperature measuring thermocouple 14 and the second temperature measuring thermocouple 15 are both located in the carbonization chamber 11. The first temperature measuring thermocouple 14 is suitable for measuring the temperature of the raw coal, and the second temperature measuring thermocouple 15 is suitable for measuring the temperature of the carbonization chamber 11.

[0055] Understandably, during the coking test, the first thermocouple 14 can monitor the temperature of the coal cake to preliminarily determine whether the coal cake is ready for coking, while the second thermocouple 15 is used to monitor the temperature of the carbonization chamber 11 so that the temperature of the carbonization chamber 11 can be adjusted according to the temperature measurement to ensure that the temperature of the carbonization chamber 11 meets the thermal energy requirements for coal cake coking.

[0056] like Figures 1 to 5 As shown, in some embodiments, the top wall of the carbonization chamber 1 is provided with a through hole extending along the height direction of the furnace body 5. The through hole is located at the center of the top wall of the carbonization chamber 1. The first temperature measuring thermocouple 14 is slidably engaged with the through hole so that the temperature measuring end of the first temperature measuring thermocouple 14 can be inserted into the center of the raw coal to monitor the temperature.

[0057] It is understandable that placing the first temperature measuring thermocouple 14 at the center of the carbonization chamber 1 can enable the first temperature measuring thermocouple 14 to monitor the center temperature of the coal cake in real time, so as to ensure the accuracy of the judgment on the coking maturity of the coal cake.

[0058] Specifically, the measuring end of the first temperature-measuring thermocouple 14 passes through the top wall and through the hole of the furnace body 5 from top to bottom and enters the carbonization chamber 11. The second temperature-measuring thermocouple 15 can also pass through the top wall of the furnace body 5 and the top wall of the carbonization chamber 1 from top to bottom and enter the carbonization chamber 11. The first temperature-measuring thermocouple 14 and the second temperature-measuring thermocouple 15 can be arranged at intervals along the first direction.

[0059] It should be noted that, in order to ensure that the first temperature measuring thermocouple 14 can be inserted into the center of the coal cake for temperature measurement, after the raw coal is tamped into a coal cake with a certain bulk density by the tamping device, by measuring the volume of the coal cake, a circular hole with a depth of half the total height of the coal cake and a diameter larger than the outer diameter of the first temperature measuring thermocouple 14 can be hammered out at the center of the upper surface of the coal cake using an iron rod. This allows the first temperature measuring thermocouple 14 to be inserted into the center of the coal cake for real-time temperature measurement after the coal cake is placed into the carbonization chamber 11 through the inlet and outlet.

[0060] like Figure 5As shown, in some embodiments, the heat recovery test coke oven also includes a third temperature-measuring thermocouple 23. The temperature-measuring end of the third temperature-measuring thermocouple 23 is located in the combustion chamber 21, and the third temperature-measuring thermocouple 23 is adapted to measure the temperature of the combustion chamber 21. The third temperature-measuring thermocouple 23 and the secondary air inlet 22 can be separately located on both sides of the combustion chamber 21 along the left-right direction. That is, the secondary air inlet 22 can pass through the left side wall of the furnace body 5 from left to right and communicate with the combustion chamber 21, and the temperature-measuring end of the third temperature-measuring thermocouple 23 can pass through the right side wall of the furnace body 5 from right to left and enter the combustion chamber 21.

[0061] like Figure 5 As shown, in some embodiments, the heat recovery test coke oven also includes a fourth temperature measuring thermocouple 42, the temperature measuring end of the fourth temperature measuring thermocouple 42 is located at the flue gas outlet 41, and the fourth temperature measuring thermocouple is adapted to measure the temperature of the flue gas flowing out of the furnace body.

[0062] The temperature measuring end of the thermocouple 42 can be inserted into the side wall of the flue gas outlet 41 from right to left.

[0063] like Figures 1 to 6 As shown, in some embodiments, the heat recovery test coke oven also includes an upper heating zone 6, which is located in the accommodating cavity. The bottom wall of the upper heating zone 6 is in contact with the top wall of the carbonization chamber 1 and heat transfer can occur.

[0064] It is understandable that the upper heating zone 6 can preheat the carbonization chamber 1, and when the heat energy generated by the combustion of raw coal gas in the carbonization chamber 11 is insufficient to maintain the heat energy required for the coking of coal cake, the upper heating zone 6 can work to supplement the heat energy of the carbonization chamber 11.

[0065] Specifically, the upper heating zone 6 is not limited to the top middle area of ​​the carbonization chamber 1. In this case, the primary air inlet 12 can be located on the right side of the upper heating zone 6, and the second temperature measuring thermocouple 15 can be located on the left side of the upper heating zone 6.

[0066] like Figures 1 to 6 As shown, in some embodiments, the heat recovery test coke oven further includes a lower heating zone 7, which is located in the accommodating cavity. The top wall of the lower heating zone 7 is in contact with the bottom wall of the combustion chamber 2 and heat transfer can occur between them. The lower heating zone 7 is not limited to being located in the middle region of the bottom of the combustion chamber 2.

[0067] It is understandable that by cooperating with the lower heating zone 7 and the upper heating zone 6, heat energy can be provided to the carbonization chamber 1 from both below and above, so that the coal cake can be heated evenly in the carbonization chamber 11, ensuring the quality of coke. Moreover, both can preheat the carbonization chamber 1 at the same time, improving the preheating efficiency. In the process of the lower heating zone 7 transferring heat energy from the combustion chamber 21 to the carbonization chamber 1, it also promotes the full combustion of secondary flue gas in the combustion chamber 21.

[0068] It should be noted that in the initial stage of coking, the heat energy provided to the carbonization chamber 1 by the upper heating zone 6 and the heat energy conducted to the carbonization chamber 1 by the lower heating zone 7 through the combustion chamber 2 are used to cover the surface of the coal cake with the raw coal gas released by the heating, forming the first gas protection layer. Then the raw coal gas diffuses into the top space of the carbonization chamber 11 and mixes with the air entering from the primary air inlet 12 of the carbonization chamber 1, resulting in incomplete combustion. The generated flue gas forms the second gas protection layer between the coal (coke) and the air. Since the raw coal gas continuously generated by the heating of the coal cake completely covers the coal (coke) and continuously diffuses into the top of the carbonization chamber 11, the coal (coke) is always covered with a good gas protection layer throughout the entire coking cycle. Therefore, the coal can be coked under the condition of being isolated from air, protecting the surface of the coal (coke) from being ashed.

[0069] like Figures 1 to 6 As shown, in some embodiments, the heat recovery test coke oven includes an upper heating zone 6 and a lower heating zone 7; both the upper heating zone 6 and the lower heating zone 7 are provided with heating chambers 61 and include silicon carbide rods 62 and temperature-controlled thermocouples 63. The heating chamber 61 of the upper heating zone 6 can transfer heat to the carbonization chamber 11, and the heating chamber 61 of the lower heating zone 7 can transfer heat to the combustion chamber 21. There are multiple silicon carbide rods 62 arranged at intervals in the heating chamber 61, and the temperature measuring end of the temperature-controlled thermocouple 63 is located in the heating chamber 61.

[0070] It is understandable that the heating chamber 61 can be heated by energizing the silicon carbide rod 62 to preheat the carbonization chamber 1 or to supplement its heat energy, while the temperature control thermocouple 63 can monitor the temperature of the heating chamber 61 in real time to control the operation of the silicon carbide rod 62 and realize the temperature control of the upper heating zone 6 and the lower heating zone 7.

[0071] Specifically, the plurality of silicon carbide rods 62 may not be arranged at intervals along the first direction in the heating chamber 61.

[0072] like Figure 6 As shown, in some embodiments, both the upper heating zone 6 and the lower heating zone 7 further include a ceramic sleeve 64, which is sleeved on the silicon carbide rod 62. There are multiple ceramic sleeves 64, each corresponding to a silicon carbide rod 62. The ceramic sleeves 64 ensure that any two adjacent silicon carbide rods 62 are insulated from each other, effectively preventing mutual interference when the silicon carbide rods 62 are energized.

[0073] In summary, it can be understood that the heat recovery experimental coke oven of the present invention has the following characteristics: 1) The heat recovery test small coke oven creatively adopted the structure of carbonization chamber 1 and combustion chamber 2, avoiding the loss of coking coal caused by improper coking operation in the same chamber; 2) The heat recovery test of the small coke oven effectively and fully utilizes the heat energy generated by the combustion of raw coal gas produced by coal pyrolysis, resulting in a higher heat energy utilization rate; 3) The use of micro-negative pressure coking operation and heat recovery process reduces the amount of pollutants generated and discharged; 4) Compared with the chemical product recovery pilot coke oven in related technologies, the heat recovery pilot coke oven can produce higher quality coke with the same coal blend. Under the premise of the same coke quality, the heat recovery pilot coke oven can utilize more weakly caking coal and anthracite for coking, which can broaden the utilization of coal resources and reduce coking costs. 5) Due to the structural characteristics of the small coke oven used in the heat recovery test, the expansion pressure of coal during the coking test will not have a destructive effect on the furnace wall of carbonization chamber 1, and will not cause problems with coking difficulties.

[0074] In addition, the working process of this heat recovery test coke oven will now be explained in detail, taking into account its specific structure: Step 1: Prepare the coal cake for the coking test: According to the required proportion and total moisture content, the raw coal is tamped into a coal cake with a preset bulk density using a tamping device. The volume of the coal cake is measured, and a circular hole with a depth of half the total height of the coal cake and a diameter larger than the outer diameter of the first thermocouple 14 is struck at the center of the upper surface of the coal cake using an iron rod. At the same time, according to the required heating regime, the upper heating zone 6 and the lower heating zone 7 are started, and the carbonization chamber 1 and the combustion chamber 2 are preheated to a certain temperature by the silicon carbide rod 62 and maintained at that temperature. Step 2: Feed the coal cake into the carbonization chamber 11 through the inlet and outlet, and quickly close the furnace door so that the measuring end of the first temperature measuring thermocouple 14 is inserted into the central hole of the coal cake to conduct a coking test. Step 3: During the coking process, the raw coal gas generated by the heating of the coal cake in the carbonization chamber 11 mixes with the air entering through the primary air inlet 12 but does not burn completely. The heat generated provides some of the heat energy for the coking of the coal cake. At the same time, the primary flue gas formed enters the air inlet 31 through the air outlet 13. The primary flue gas entering from the air inlet 31 then enters the combustion chamber 2 through the descending flue 3. After being fully mixed with the air entering through the secondary air inlet 22, secondary combustion occurs. The heat energy generated after combustion is transferred to the coal cake in the carbonization chamber 11 through the combustion chamber 21, and secondary flue gas is formed and discharged from the heat recovery test coke oven through the flue gas outlet 41 of the ascending flue 4. Thus, the test coking of raw coal in the carbonization chamber 1 is realized. The flue gas outlet 41 can be connected to the next system (i.e., the system that needs to utilize heat energy) to realize the reuse of waste heat from the secondary flue gas.

[0075] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A heat recovery experimental coke oven, characterized in that, include: A carbonization chamber, the carbonization chamber having a carbonization cavity and a primary air inlet and an airflow outlet communicating with the carbonization cavity, the carbonization cavity being suitable for coking raw coal; The combustion chamber has a top wall that contacts the bottom wall of the carbonization chamber and allows heat transfer. The combustion chamber has a combustion cavity and a secondary air inlet communicating with the combustion cavity. The descending fire channel and the ascending fire channel are respectively located on opposite sides of the carbonization chamber along the first direction and are both connected to the combustion chamber. The descending fire channel is provided with an air inlet connected to the airflow outlet, and the ascending fire channel is provided with a flue gas outlet. The furnace body has a accommodating cavity, and the carbonization chamber, the combustion chamber, the descending fire channel, and the ascending fire channel are all installed in the accommodating cavity. The first direction is perpendicular to the height direction of the furnace body.

2. The heat recovery experimental coke oven according to claim 1, characterized in that, The carbonization chamber extends along a second direction, and the second direction, the first direction, and the height direction of the furnace body are mutually perpendicular. The height direction of the carbonization chamber is consistent with the height direction of the furnace body. The height of the carbonization chamber is h, and the width of the carbonization chamber along the first direction is a, where a > h.

3. The heat recovery test coke oven according to claim 1, characterized in that, At least one of the descending fire channel and the ascending fire channel is in contact with the side wall of the carbonization chamber and heat transfer can occur.

4. The heat recovery test coke oven according to claim 1, characterized in that, At least a portion of each of the descending fire channel and the ascending fire channel extends out of the top wall of the furnace body; The heat recovery test coke oven also includes an explosion-proof plate, which is installed on top of the descending fire channel to cover the top opening of the descending fire channel.

5. The heat recovery test coke oven according to claim 1, characterized in that, The primary air inlet extends along the height direction of the furnace body, and the primary air inlet is higher than the airflow outlet in the height direction of the furnace body; And / or, the descending fire channel extends along the height direction of the furnace body, and the secondary air inlet is connected to the combustion chamber along the first direction.

6. The heat recovery test coke oven according to claim 1, characterized in that, It also includes a first temperature measuring thermocouple and a second temperature measuring thermocouple, the temperature measuring ends of the first temperature measuring thermocouple and the second temperature measuring thermocouple are both located in the carbonization chamber, the first temperature measuring thermocouple is suitable for measuring the temperature of the raw coal, and the second temperature measuring thermocouple is suitable for measuring the temperature of the carbonization chamber.

7. The heat recovery test coke oven according to claim 1, characterized in that, It also includes a third temperature-measuring thermocouple, the temperature-measuring end of which is located in the combustion chamber, and the third temperature-measuring thermocouple is adapted to measure the temperature of the combustion chamber.

8. The heat recovery test coke oven according to any one of claims 1-7, characterized in that, Also includes: The upper heating zone is located in the accommodating cavity, and the bottom wall of the upper heating zone is in contact with the top wall of the carbonization chamber and heat transfer can occur between them. and / or The lower heating zone is located in the accommodating cavity, and the top wall of the lower heating zone is in contact with the bottom wall of the combustion chamber and heat transfer can occur between them.

9. The heat recovery test coke oven according to claim 8, characterized in that, The heat recovery test coke oven includes the upper heating zone and the lower heating zone; Both the upper heating zone and the lower heating zone are provided with heating chambers and include silicon carbide rods and temperature-controlled thermocouples. The heating chamber of the upper heating zone can transfer heat to the carbonization chamber, and the heating chamber of the lower heating zone can transfer heat to the combustion chamber. There are multiple silicon carbide rods arranged at intervals in the heating chambers, and the temperature measuring end of the temperature-controlled thermocouple is located in the heating chamber.

10. The heat recovery test coke oven according to claim 9, characterized in that, Both the upper heating zone and the lower heating zone include ceramic sleeves, which are fitted onto the silicon carbide rods. There are multiple ceramic sleeves, each corresponding to one of the silicon carbide rods.

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