Horizontal heat recovery coke oven

Abstract

The embodiment of the invention provides a horizontal heat recovery coke oven which comprises a carbonization chamber arranged in the horizontal heat recovery coke oven, and an outer wall of the horizontal heat recovery coke oven wraps the carbonization chamber to form a coke oven outer arch; a coke oven inner arch is arranged in the carbonization chamber; the top, the side wall and the bottom silica bricks of the coke oven inner arch form an accommodating area; a double-layer arched flue is arranged between the coke oven inner arch and the coke oven outer arch; the inner sides of the coke oven inner arch and the coke oven outer arch are coated with reflective paint, an air channel is arranged in the top of the coke oven outer arch, and the air channel is provided with a primary air hole facing the double-layer arched flue; a raw gas crossing hole is formed in the side wall of the coke oven inner arch; the carbonization chamber also comprises a heating flue which is coated with a reflective coating and is arranged at the bottom of the carbonization chamber; a descending flame path is communicated with the double-layer arched flue; a cooling air channel is arranged at the bottom of the heating flue; the cooling air channel is connected with a preheated air collecting pipeline, and a heat preservation pipeline is arranged between the preheated air collecting pipeline and the air channel.

Description

Technical Field

[0001] The invention relates to the technical field of coking, and in particular to a horizontal heat recovery coke oven. Background Art

[0002] At present, the horizontal hot recycle coke oven technology has been valued by the coking industry due to its environmentally friendly characteristics. The characteristic of this coke oven is that the raw gas generated by the coal during the coking process and the air introduced by the negative pressure of the arch top are directly burned in the arched space above the coal in the carbonization chamber to provide the heat required for heating the upper part of the coal. The radiant heat generated by the combustion of the raw gas and the convection heat of the flue gas provide the heat required for heating the upper part of the coal. The remaining raw gas enters the heating flue (quadruple or six-linked flue) through the descending flue and is secondary burned with the air provided by the secondary air holes to provide the heat required for heating the bottom of the coal.

[0003] This heating method has many problems. For example, during the primary combustion process in the carbonization chamber, air directly enters the carbonization chamber and burns with the raw gas. Therefore, the upper part of the coal will also be burned while the raw gas is burned, causing burnt coal and resulting in excessive coal loss. In addition, the ratio of primary combustion and secondary combustion is difficult to control. When the primary combustion ratio is high, the burnt coal loss increases, while the heating temperature of the lower part of the coal is low, which makes the coke maturation time longer. When the secondary combustion ratio is high, the temperature of the coke oven bottom plate increases, affecting the life of the furnace body.

[0004] like Figure 1 As shown, Figure 1 It is a schematic diagram of a horizontal heat recovery coke oven in the prior art. In the coking process of the horizontal heat recovery coke oven in the prior art, the raw gas generated by the coal material 2 is directly burned once with the air introduced through the negative pressure of the arch in the arch space above the carbonization chamber 10. The radiant heat generated by the combustion of the raw gas and the convection heat of the flue gas provide the heat required for heating the upper part of the coal material 2. In addition to directly heating the coal material 2, the radiant heat generated by the combustion is also transferred to the furnace wall 3 of the horizontal heat recovery coke oven, and the furnace wall reflects part of the radiant heat to the coal material 2 in the carbonization chamber 10 and the flue gas generated by the combustion.

[0005] The remaining raw coal gas after the primary combustion enters the quadruple fire channel 32 through the main wall downcomer 31 for secondary combustion with the air provided by the secondary air channel 33. The heat generated by the combustion is transferred to the silicon bricks 34 at the bottom of the carbonization chamber 10 through thermal radiation and thermal convection. The bottom silicon bricks 34 transfer the heat to the coal material 2 through thermal radiation and heat conduction, thereby heating the lower part of the coal material 2.

[0006] However, in this process, since air directly enters the carbonization chamber 10 and burns with the raw coal gas, the primary combustion process will directly burn the upper part of the coal material 2, thereby causing the problem of coal material 2 burning, and the coal material 2 burning rate is more than 3%. Since the silicon bricks in the vault of the carbonization chamber 10 absorb a large amount of radiant heat and only reflect part of the heat to heat the coal material 2, the heat loss at the vault position is large, and the air cooling channel 35 at the bottom of the coke oven will cause the temperature in the coke oven to dissipate, resulting in heat waste. At the same time, the introduction point of the primary combustion air is distributed on the center line of the furnace top, and local overtemperature is easily formed near the air inlet position, resulting in uneven temperature distribution in the carbonization chamber 10. The ratio of primary combustion and secondary combustion is difficult to control. When the primary combustion ratio is high, the upper part of the coal material 2 is burned and the heating temperature of the lower part is low, and the coke maturation time is long. When the secondary combustion ratio is high, the temperature of the coke oven bottom plate increases, affecting the life of the furnace body. Therefore, the horizontal heat recovery coke oven in the related art will cause excessive burning and excessive heat loss. Summary of the invention

[0007] The purpose of the embodiment of the present invention is to provide a horizontal heat recovery coke oven to solve the problem of burning of the upper part of the coal and uniform heating of the coal. The specific technical solution is as follows:

[0008] The embodiment of the present application provides a horizontal heat recovery coke oven, which comprises:

[0009] A carbonization chamber is arranged inside the horizontal heat recovery coke oven, and the outer wall of the horizontal heat recovery coke oven wraps the carbonization chamber to form an outer arch of the coke oven;

[0010] A coke oven inner arch is arranged inside the carbonization chamber;

[0011] The top, side walls and bottom silicon bricks of the coke oven inner arch are formed into a receiving area for placing coal materials;

[0012] There is a spacing area between the coke oven inner arch and the coke oven outer arch, and the spacing area is formed into a double-layer arched flue for heating the top of the coal in the coke oven inner arch;

[0013] An air passage is provided inside the top of the coke oven outer arch to preheat the air, the air passage is arranged in a circuitous manner and spaced apart, and a preheating air inlet is provided on the side wall of the air passage, and a preheating air outlet is provided on the bottom;

[0014] The coke oven outer arch is also provided with a primary air hole facing the double-layer arched flue, and the air passage is connected with the primary air hole through a preheated air outlet so that the preheated air enters the double-layer arched flue to reduce the heat loss at the top of the coke oven outer arch;

[0015] The side wall of the coke oven inner arch is provided with a raw gas crossing hole, and the raw gas crossing hole is used to connect the double-layer arched flue and the coke oven inner arch, so that the raw gas generated in the coke oven inner arch enters the double-layer arched flue and burns with the air entering from the primary air hole;

[0016] The carbonization chamber also includes a heating flue, which is arranged at the bottom of the carbonization chamber and is used to heat the bottom of the coal in the inner arch of the coke oven; it is connected with the double-layer arched flue through a downcomer to deliver the remaining raw coal gas in the double-layer arched flue to the heating flue;

[0017] The carbonization chamber further comprises a coke oven bottom plate, and the coke oven bottom plate is located at the bottom of the heating flue;

[0018] A cooling air channel for cooling the coke oven bottom plate is provided at the bottom of the heating flue, and the cooling air channel is located inside the coke oven bottom plate; one end of the cooling air channel is connected to the preheating air collecting pipe, and the other end is connected to the outside air;

[0019] An insulation pipe is provided between the preheated air collecting pipe and the air channel, one end of the insulation pipe is connected to the preheated air collecting pipe, and the other end is connected to the preheated air inlet of the air channel;

[0020] A circulation fan is provided at one end of the preheated air duct, and the circulation fan is located between the preheated air collecting duct and the insulation duct, and is used to transport the preheated air in the preheated air collecting duct to the insulation duct and the air channel;

[0021] The air channel extends to the descending fire channel, and a secondary air hole is provided at the extension portion. The air channel is connected with the secondary air hole through a preheating air outlet, so that the preheated air in the air channel enters the heating flue through the descending fire channel and burns with the raw coal gas.

[0022] In some embodiments of the present application, the carbonization chamber further comprises a raw gas balance channel;

[0023] The raw gas balance channel and the raw gas crossing hole are arranged side by side;

[0024] The raw gas balance channel is arranged between the inner arch of the coke oven and the outer arch of the coke oven, and extends toward a side away from the outer arch of the coke oven, so as to be connected with the carbonization chamber of the adjacent horizontal heat recovery coke oven.

[0025] In some embodiments of the present application, the horizontal heat recovery coke oven further comprises:

[0026] An exhaust gas pipeline is arranged outside the coke oven outer arch and is used to discharge the exhaust gas generated by combustion out of the furnace body;

[0027] The ascending fire duct is arranged on a side of the heating flue away from the descending fire duct, and the heating flue and the exhaust gas pipeline are connected through the ascending fire duct.

[0028] In some embodiments of the present application, the cooling air channel and the preheated air collecting duct are arranged at the same height on the coke oven bottom plate.

[0029] In some embodiments of the present application, the primary air hole is an air hole with adjustable positive pressure, and the secondary air hole adjusts the air intake volume through an adjusting brick arranged outside the horizontal heat recovery coke oven.

[0030] In some embodiments of the present application, a heat-insulating coating is applied at the top of the coke oven outer arch;

[0031] The high-reflective infrared coating is coated on the side of the heat-insulating coating at the top position of the coke oven outer arch away from the coke oven outer arch;

[0032] The top of the coke oven inner arch is coated with a high-emission infrared paint;

[0033] The bottom and side walls of the heating flue are coated with heat-insulating paint;

[0034] The side of the heat-insulating coating at the bottom and side wall of the heating flue away from the bottom and side wall of the heating flue is coated with the high-reflection infrared coating;

[0035] A high-emission infrared paint is coated at the top of the heating flue.

[0036] Beneficial effects of the embodiments of the present invention:

[0037] A horizontal heat recovery coke oven provided by an embodiment of the present invention has an additional coke oven inner arch in the carbonization chamber, and the top, side walls and bottom silicon bricks of the coke oven inner arch form a receiving area for placing coal materials. The outer wall of the horizontal heat recovery coke oven wraps the carbonization chamber to form a coke oven outer arch, and the interval area between the coke oven inner arch and the coke oven outer arch forms a double-layer arched flue. Under the action of the circulating fan, the preheated air collection pipe, the insulation pipe and the air channel convey the external air to the primary air hole and the secondary air hole by positive pressure, and the external air is continuously preheated during the conveying process to realize the combustion-supporting air conveyance in a closed environment isolated from the outside world.

[0038] At the same time, since the air passage inside the outer arch of the coke oven is arranged in a circuitous manner, the moving distance of the preheated air in the air passage is extended, and the heat transferred to the outer arch of the coke oven from the double-layer arched flue can be fully absorbed in the air passage, and heat recovery is achieved while continuing to be heated, thereby playing a role in insulating the outer arch of the coke oven, and effectively improving the heat loss problem caused by the heat transfer from the double-layer arched flue to the outer arch of the coke oven.

[0039] During the production process, the raw gas generated by the dry distillation of coal in the inner arch of the coke oven is transported to the double-layer arched flue through the raw gas crossing hole located on the side wall of the inner arch of the coke oven, and burns with the preheated air output from the primary air hole on the top of the outer arch of the coke oven in the double-layer arched flue, so that the raw gas and the preheated air are burned once in the double-layer arched flue of the carbonization chamber, and the heat generated by the combustion heats the inner arch of the coke oven, and the inner arch of the coke oven transfers the heat to the raw gas generated by the coal in the inner arch of the coke oven, and finally the raw gas transfers the heat to the coal placed in the inner arch of the coke oven, thereby heating the upper part of the coal in the inner arch of the coke oven. In this process, since the inner arch of the coke oven separates the double-layer arched flue from the containing area inside the inner arch of the coke oven, the raw gas burns in the double-layer arched flue and does not directly contact the coal in the inner arch of the coke oven, thereby avoiding the problem of burning of the coal during the combustion.

[0040] At the same time, a heating flue is also provided at the bottom of the carbonization chamber. The remaining raw gas after the primary combustion flows into the heating flue through the downcomer and undergoes secondary combustion with the preheated air output from the secondary air hole. The heat generated by the combustion heats the top of the heating flue, which transfers the heat to the coal placed in the coke oven inner arch, thereby heating the bottom of the coal in the coke oven inner arch. The primary combustion and the secondary combustion cooperate to achieve uniform heating of the coal.

[0041] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic diagram of a horizontal heat recovery coke oven in the prior art;

[0044] Figure 2 Cross-sectional views of three different depths of a horizontal heat recovery coke oven provided in an embodiment of the present application;

[0045] Figure 3for Figure 2 Schematic diagram of the structure of the air channel;

[0046] Figure 4 for Figure 2 A schematic diagram of the structure of the air channel from another perspective;

[0047] Figure 5 for Figure 3 and Figure 4 a cross-sectional view of the air passage shown;

[0048] Figure 6 for Figure 2 A schematic diagram of the structure when the preheating air collecting duct and the cooling air channel are connected;

[0049] Figure 7 for Figure 6 A cross-sectional view of the preheated air collecting duct and the cooling air passage when they are connected;

[0050] Figure 8 for Figure 2 Schematic diagram of the location of coating applied to the horizontal heat recovery coke oven.

[0051] Reference numerals:

[0052] Horizontal heat recovery coke oven 1, carbonization chamber 10, coke oven inner arch 101, raw gas crossing hole 102, raw gas balance channel 103, outer wall 11 of horizontal heat recovery coke oven, coke oven outer arch 111, double-layer arched flue 12, descending fire channel 121, ascending fire channel 122, air channel 13, primary air hole 131, secondary air hole 132, insulation pipe 133, preheating air inlet 134, preheating air outlet 135, heating flue 14, preheating air collecting pipe 15, circulating fan 151, exhaust gas pipe 16, coke oven bottom plate 17, cooling air channel 171, coal material 2;

[0053] A furnace wall 3 of a horizontal heat recovery coke oven, a main wall descending channel 31, a quadruple fire channel 32, a secondary air channel 33, a bottom silicon brick 34, and an air cooling channel 35;

[0054] Thermal insulation coating 4, high reflective infrared coating 5, high emissive infrared coating 6;

[0055] The first depth cross-sectional view A, the second depth cross-sectional view B, and the third depth cross-sectional view C. DETAILED DESCRIPTION

[0056] 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 embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the present invention.

[0057] In order to overcome various technical problems brought about by the horizontal heat recovery coke oven in the prior art, the embodiment of the present application provides a horizontal heat recovery coke oven, such as Figure 2 As shown, Figure 2The cross-sectional views of three different depths of the horizontal heat recovery coke oven provided in the embodiment of the present application. The horizontal heat recovery coke oven comprises: a carbonization chamber 10, which is arranged inside the horizontal heat recovery coke oven 1, and the outer wall 11 of the horizontal heat recovery coke oven wraps the carbonization chamber 10 to form a coke oven outer arch 111; a coke oven inner arch 101 is arranged inside the carbonization chamber 10; the top, side walls and bottom silicon bricks of the coke oven inner arch 101 are formed into a containing area for placing coal 2; there is a spacing area between the coke oven inner arch 101 and the coke oven outer arch 111, and the spacing area is formed into a double-layer arched flue 12, which is used to heat the top of the coal 2 in the coke oven inner arch 101; an air channel 13 is arranged inside the top of the coke oven outer arch 111 to reduce the heat loss from the top of the coke oven outer arch 111 and preheat the air, and the air channel 13 is arranged as a circuitous spacing discharge. The coke oven outer arch 111 is also provided with a primary air hole 131 facing the double-layer arched flue 12, and the air channel 13 is connected with the primary air hole 131 through the preheated air outlet 135, so that the preheated air enters the double-layer arched flue 12; the coke oven inner arch 101 is provided with a raw gas crossing hole 102 on the side wall, and the raw gas crossing hole 102 is used to connect the double-layer arched flue 12 and the coke oven inner arch 101, so that the raw gas generated in the coke oven inner arch 101 enters the double-layer arched flue 12 and burns with the air entering from the primary air hole 131; the carbonization chamber 10 also includes a heating flue 14, which is arranged at The bottom of the carbonization chamber 10 is used to heat the bottom of the coal material 2 in the coke oven inner arch 101; the heating flue 14 is connected to the double-layer arched flue 12 through the downcomer 121 to deliver the remaining raw coal gas in the double-layer arched flue 12 to the heating flue 14; the carbonization chamber 10 also includes a coke oven bottom plate 17, which is located at the bottom of the heating flue 14; a cooling air channel 171 for cooling the coke oven bottom plate 17 is provided at the bottom of the heating flue 14, and the cooling air channel 171 is located inside the coke oven bottom plate; one end of the cooling air channel 171 is connected to the preheating air collecting pipe 15, and the other side is connected to the outside air; an insulation pipe 133 is provided between the preheating air collecting pipe 15 and the air channel 13, and the insulation pipe One end of the duct 133 is connected to the preheated air collecting duct 15, and the other end is connected to the preheated air inlet 134 of the air channel 13; a circulating fan 151 is provided at one end of the preheated air collecting duct 15, and the circulating fan 151 is located between the preheated air collecting duct 15 and the insulation duct 133, and is used to transport the preheated air in the preheated air collecting duct 15 to the insulation duct 133 and the air channel 13; the air channel 13 extends to the downcomer 121, and the extension part is provided with secondary air holes 132. The air channel 13 is connected to the secondary air holes 132 through the preheated air outlet 135, so that the preheated air in the air channel 13 enters the heating flue 14 through the downcomer 121 and burns with the raw coal gas.

[0058] In this embodiment, reference Figure 2 , a coke oven inner arch 101 is added to the carbonization chamber 10, and the top, side walls and bottom silicon bricks of the coke oven inner arch 101 are formed into a receiving area for placing coal 2, and the outer wall 11 of the horizontal heat recovery coke oven wraps the carbonization chamber 10 to form a coke oven outer arch 111, and the interval area between the coke oven inner arch 101 and the coke oven outer arch 111 is formed into a double-layer arched flue 12. Under the action of the circulating fan 151, the preheated air collecting duct 15, the insulation duct 133 and the air channel 13 convey the external air to the primary air hole 131 and the secondary air hole 132 by positive pressure, and the external air is continuously preheated during the conveying process to realize the combustion air conveying in a closed environment isolated from the outside world.

[0059] Also, see Figures 3 to 5 , Figure 3 for Figure 2 Schematic diagram of the structure of the air channel. Figure 4 for Figure 2 Another structural diagram of the air channel. Figure 5 for Figure 3 and Figure 4 As shown in the cross-sectional view of the air passage. Since the air passage 13 inside the coke oven outer arch 111 is arranged in a circuitous and spaced arrangement, the moving distance of the preheated air in the air passage 13 is extended, and the heat transferred from the double-layer arched flue 12 to the coke oven outer arch 111 can be fully absorbed in the air passage 13, and the heat is recovered while being continuously heated, thereby playing a role of heat insulation for the coke oven outer arch 111, and effectively improving the problem of heat loss caused by the heat in the double-layer arched flue 12 being transferred to the coke oven outer arch 111.

[0060] During the production process, the raw gas generated by dry distillation of the coal material 2 in the coke oven inner arch 101 is transported to the double-layer arched flue 12 through the raw gas crossing hole 102 located on the side wall of the coke oven inner arch 101, and is burned with the preheated air output from the primary air hole 131 at the top of the coke oven outer arch 111 in the double-layer arched flue 12, so that the raw gas is burned once with the preheated air in the double-layer arched flue 12 of the carbonization chamber 10, and the heat generated by the combustion heats the coke oven inner arch 101, and the coke oven inner arch 101 transfers the heat to the coke oven inner arch 101. The raw coal gas generated by the coal material 2 in the inner arch 101 of the coke oven is delivered to the raw coal gas, and finally the raw coal gas transfers the heat to the coal material 2 placed in the inner arch 101 of the coke oven, so as to heat the upper part of the coal material 2 in the inner arch 101 of the coke oven. In this process, since the inner arch 101 of the coke oven separates the double-layer arched flue 12 from the accommodating area inside the inner arch 101 of the coke oven, the raw coal gas burns in the double-layer arched flue 12 and does not directly contact the coal material 2 in the inner arch 101 of the coke oven, thereby avoiding the problem of burning of the coal material 2 during the combustion process.

[0061] At the same time, a heating flue 14 is also provided at the bottom of the carbonization chamber 10. The remaining raw gas after the primary combustion flows into the heating flue 14 through the downcomer 121 and performs secondary combustion with the preheated air output from the secondary air hole 132. The heat generated by the combustion heats the top of the heating flue 14, and the top of the heating flue 14 transfers the heat to the coal material 2 placed in the coke oven inner arch 101, thereby heating the bottom of the coal material 2 in the coke oven inner arch 101. The primary combustion and the secondary combustion cooperate to achieve uniform heating of the coal material 2.

[0062] like Figure 2 , Figure 6 and Figure 7 As shown, Figure 6 for Figure 2 The schematic diagram of the structure when the preheating air collecting duct and the cooling air channel are connected. Figure 7 for Figure 6 The cross-sectional view of the preheating air collecting duct and the cooling air channel when they are connected. The coke oven bottom plate 17 is located at the bottom of the heating flue 14, providing support for the horizontal heat recovery coke oven 1, and the preheating air collecting duct 15 is arranged inside the coke oven bottom plate 17. One end of the cooling air channel 171 is connected to the outside air, and the other end is connected to the preheating air collecting duct 15. The outside cooling air enters the cooling air channel 171 through the cooling air channel 171 away from the side of the preheating air collecting duct 15. The cooling air in the cooling air channel 171 cools the coke oven bottom plate 17 on the one hand, so that the temperature of the coke oven bottom plate 17 that rises due to the combustion in the heating flue 14 decreases; on the other hand, the cooling air absorbs heat for preheating during the cooling process. When the cooling is completed, the cooling air becomes preheating air, thereby realizing heat recovery.

[0063] At this time, the preheated air enters the preheated air collecting pipe 15 through the cooling air passage 171, and enters the air passage 13 inside the coke oven outer arch 111 through the preheated air inlet 134 along the preheated air collecting pipe 15 and the insulation pipe 133. When the preheated air reaches the primary air hole 131, a part of the preheated air in the air passage 13 enters the double-layer arched flue 12 from the primary air hole 131 through the preheated air outlet 135, and burns with the raw coal gas in the double-layer arched flue 12. The heat generated by the combustion heats the coke oven inner arch 101, and the coke oven inner arch 101 transfers the heat to the raw coal gas generated by the coal 2 in the coke oven inner arch 101. Finally, the raw coal gas transfers the heat to the coal 2 in the coke oven inner arch 101, providing heat for the upper part of the coal 2. Another part of the preheated air continues to flow along the air channel 13. When it reaches the secondary air hole 132 of the downcomer 121, the remaining preheated air enters the heating flue 14 connected to the downcomer 121 from the secondary air hole 132 through other preheated air outlets 135 on the air channel 13, and performs secondary combustion with the raw coal gas in the heating flue 14, providing heat for the lower part of the coal material 2. The preheated air is continuously heated during the flow in the preheated air collecting pipe 15, the insulation pipe 133 and the air channel 13, so that the preheated air is continuously preheated. At the same time, since the air channel 13 inside the coke oven outer arch 111 is arranged in a circuitous interval arrangement, the moving distance of the preheated air in the air channel 13 is extended, and the heat transferred from the double-layer arched flue 12 to the coke oven outer arch 111 can be fully absorbed in the air channel 13, and the heat is recovered while being continuously heated, thereby playing a role in insulating the coke oven outer arch 111.

[0064] In some embodiments of the present application, the cooling air passage 171 and the preheated air collecting duct 15 are arranged at the same height in the coke oven bottom plate 17 .

[0065] In this embodiment, reference Figure 6 and Figure 7 Since the cooling air passage 171 and the preheated air collecting duct 15 are arranged at the same height, the resistance along the flow of the external cooling air is effectively reduced.

[0066] In some embodiments of the present application, Figure 2 As shown, the heating flue 14 is a four-linked arch flue or a six-linked arch flue. The primary air hole 131 is an air hole with adjustable positive pressure, and the secondary air hole adjusts the air intake through an adjusting brick (not shown) arranged outside the horizontal heat recovery coke oven.

[0067] In this embodiment, the heating flue 14 can be a four-linked arch flue or a six-linked arch flue. In actual production, other types of flues can be selected as needed, as long as the lower part of the coal material 2 can be heated. At the same time, setting the number of primary air holes 131 to 12 can effectively improve the problem of local overheating near the primary air cooling hole 131 caused by a single primary air cooling hole 131, and can ensure that the temperature in the double-layer arched flue 12 is more uniform. In actual production, different numbers of primary air holes 131 can be selected as needed, as long as the temperature in the double-layer arched flue 12 can be ensured to be uniform. The primary air holes 131 and the secondary air holes 132 are both set as adjustable air holes, which cooperate with the circulating fan 151 during the combustion process, and adjust the combustion degree by adjusting the air intake to achieve the effect of controlling the temperature in the furnace, thereby improving the problem of the difficult control of the ratio between the primary combustion in the double-layer arched flue 12 and the secondary combustion in the heating flue 14.

[0068] In some embodiments of the present application, Figure 2 As shown, the carbonization chamber 10 also includes a raw gas balancing duct 103; the raw gas balancing duct 103 and the raw gas crossing hole 102 are arranged side by side; the raw gas balancing duct 103 is arranged between the coke oven inner arch 101 and the coke oven outer arch 111, and extends toward a side away from the coke oven outer arch 111, for connecting the carbonization chamber 10 of the adjacent horizontal heat recovery coke oven 1.

[0069] In this embodiment, reference Figure 2 In the second depth section view B, the raw coal gas balance channel 103 is arranged between the carbonization chamber 10 and the coke oven outer arch 111, and extends toward the side away from the coke oven outer arch 111, so that the carbonization chamber 10 is connected with the external environment. Due to the different coking processes of adjacent carbonization chambers 10, when the raw coal gas in one carbonization chamber 10 is in excess, the other carbonization chamber 10 is in the late coking stage, and the amount of raw coal gas in the carbonization chamber 10 in the late coking stage is less. At this time, the excess raw coal gas in the carbonization chamber 10 with excess raw coal gas is transported to the adjacent carbonization chamber 10 with less raw coal gas through the raw coal gas balance channel 103, thereby reducing the pressure inside its own carbonization chamber 10 and providing raw coal gas to the adjacent carbonization chamber 10. The raw coal gas balance channel 103 transports the excess raw coal gas through the pressure difference at both ends of the balance channel.

[0070] In some embodiments of the present application, Figure 2 As shown, the horizontal heat recovery coke oven 1 also includes: an exhaust gas duct 16, which is arranged outside the coke oven outer arch 111 and is used to discharge the exhaust gas generated by combustion out of the furnace body; an ascending fire channel 122, which is arranged on the side of the heating flue 14 away from the descending fire channel 121, and the heating flue 14 and the exhaust gas duct 16 are connected through the ascending fire channel 122.

[0071] In this embodiment, reference Figure 2 In the first depth section view A in FIG. 1 , the waste gas pipe 16 outside the coke oven outer arch 111 is connected to the heating flue 14 through the ascending fire channel 122. The high-temperature waste gas after combustion in the heating flue 14 is transported to the ascending fire channel 122, transported to the waste gas pipe 16 along the ascending fire channel 122, and transported to the main waste gas channel (not shown in the figure) through the waste gas pipe, and enters the waste heat boiler (not shown in the figure) along the main waste gas channel. After heat exchange and cooling, it enters the desulfurization and denitrification device (not shown in the figure), and finally discharged into the chimney for dissipation. The discharge of high-temperature waste gas is achieved.

[0072] In some embodiments of the present application, Figure 2 The third depth cross-sectional view C and Figure 8 As shown, Figure 8 for Figure 2 Schematic diagram of the positions of the coatings applied to the horizontal heat recovery coke oven in FIG. The top position of the coke oven outer arch 111 is coated with a heat-insulating coating 4; the side of the heat-insulating coating 4 at the top position of the coke oven outer arch 111 away from the coke oven outer arch 111 is coated with a high-reflection infrared coating 5; the top position of the coke oven inner arch 101 is coated with a high-emission infrared coating 6; the bottom and side walls of the heating flue 14 are coated with a heat-insulating coating 4; the side of the heat-insulating coating 4 at the bottom and side walls of the heating flue 14 away from the bottom and side walls of the heating flue 14 is coated with a high-reflection infrared coating 5; the top position of the heating flue 14 is coated with a high-emission infrared coating 6.

[0073] In this embodiment, the bottom and side walls of the heating flue 14 and the coke oven outer arch 111 are coated with a heat-insulating coating 4, and a high-reflection infrared coating 5 is coated on the side of the heat-insulating coating 4 away from the furnace body silicon brick. The heat-insulating coating 4 is made of transition element oxides, zirconium oxide, and silicate refractory materials, which are doped at high temperature to form a solid solution and coated on the surface of the quadruple arch vault silicon brick. The coating thickness is 0.5 mm, which is used to reduce the radiation heat absorbed by the bottom and side walls of the heating flue 14 and the coke oven outer arch 111; the high-reflection infrared coating 5 is a high-temperature resistant ceramic coating, which is made of a specially modified inorganic aqueous emulsion as a film-forming material, titanium oxide, spinel, micro-powdered aluminum oxide, α-styryl quartz with a particle size of less than 5 μm, and yttrium rare earth oxides and lanthanum rare earth oxides. The coating thickness is 0.5 mm, and the coating infrared reflectivity is greater than 0.93, which is used to enhance the heat reflection ability of the bottom and side walls of the heating flue 14 and the coke oven outer arch 111. At the same time, a high-emission infrared coating 6 is coated at the top position of the coke oven inner arch 101 and at the top position of the heating flue 14. The high-emission infrared coating 6 uses a special inorganic silicate composite system as a film-forming material. Fillers such as transition element oxides, zirconium oxide, and rare earth oxide Y2O3 are added to the high-emission infrared coating 6, and the emissivity of more than 90% can be guaranteed at 800°C to 1800°C. The high-emission infrared coating 6 is coated at the top position of the coke oven inner arch 101 and at the top position of the heating flue 14 to enhance the thermal radiation capacity at the top position of the coke oven inner arch 101 and at the top position of the heating flue 14, so that the heat generated by the raw gas can more fully heat the upper and lower parts of the coal material 2, thereby reducing the heat loss of the horizontal heat recovery coke oven 1.

[0074] When the raw gas is burned in the double-layer arch flue 12 and the heating flue 14, the heat is transferred to the coke oven outer arch 111. Due to the presence of the heat-insulating coating 4 and the high-reflective infrared coating 5, the heat transferred to the coke oven outer arch 111 and the bottom and side walls of the heating flue 14 is reflected back to the top position of the coke oven inner arch 101 and the top position of the heating flue 14. At this time, due to the presence of the high-reflective infrared coating 6 at the top position of the coke oven inner arch 101 and the top position of the heating flue 14, the heat absorption effect of the two is improved, thereby enhancing the effect of heating the upper and lower parts of the coal 2. The superposition of the two reduces the amount of heat absorbed by the coke oven outer arch 111 and the bottom and side walls of the heating flue 14, and increases the amount of heat absorbed by the top position of the coke oven inner arch 101 and the top position of the heating flue 14, thereby ensuring that the heat generated by the combustion heats the coal 2. The heat loss of the horizontal heat recovery coke oven 1 is further reduced.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0076] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A horizontal heat recovery coke oven, characterized in that: include: A carbonization chamber (10) is arranged inside the horizontal heat recovery coke oven (1), and an outer wall (11) of the horizontal heat recovery coke oven wraps the carbonization chamber (10) to form a coke oven outer arch (111); A coke oven inner arch (101) is arranged inside the carbonization chamber (10); The top, side walls and bottom silicon bricks of the coke oven inner arch (101) are formed into a receiving area for placing coal (2); There is a spacing area between the coke oven inner arch (101) and the coke oven outer arch (111), and the spacing area is formed into a double-layer arched flue (12) for heating the top of the coal material (2) in the coke oven inner arch (101); An air passage (13) is provided inside the top of the coke oven outer arch (111) to preheat the air, the air passage (13) is arranged in a circuitous manner and spaced apart, and a preheating air inlet (134) is provided on the side wall of the air passage (13), and a preheating air outlet (135) is provided at the bottom; The coke oven outer arch (111) is also provided with a primary air hole (131) facing the double-layer arched flue (12); the air passage (13) is connected to the primary air hole (131) through a preheated air outlet (135) so that the preheated air enters the double-layer arched flue (12); The side wall of the coke oven inner arch (101) is provided with a raw gas crossing hole (102), and the raw gas crossing hole (102) is used to connect the double-layer arched flue (12) and the coke oven inner arch (101), so that the raw gas generated in the coke oven inner arch (101) enters the double-layer arched flue (12) and burns with the air entering from the primary air hole (131); The carbonization chamber (10) further comprises a heating flue (14), which is arranged at the bottom of the carbonization chamber (10) and is used to heat the bottom of the coal material (2) in the coke oven inner arch (101); and is connected to the double-layer arched flue (12) through a downcomer (121) to deliver the remaining raw coal gas in the double-layer arched flue (12) to the heating flue (14); The carbonization chamber (10) further comprises a coke oven bottom plate (17), wherein the coke oven bottom plate (17) is located at the bottom of the heating flue (14); A cooling air channel (171) for cooling the coke oven bottom plate (17) is provided at the bottom of the heating flue (14), and the cooling air channel (171) is located inside the coke oven bottom plate (17); one end of the cooling air channel (171) is connected to the preheated air collecting pipe (15), and the other end is in communication with the outside air; A heat preservation pipe (133) is provided between the preheated air collecting pipe (15) and the air channel (13); one end of the heat preservation pipe (133) is connected to the preheated air collecting pipe (15), and the other end is connected to the preheated air inlet (134) of the air channel (13); A circulation fan (151) is provided at one end of the preheated air duct (15); the circulation fan (151) is located between the preheated air collecting duct (15) and the insulation duct (133), and is used to transport the preheated air in the preheated air collecting duct (15) to the insulation duct (133) and the air channel (13); The air channel (13) extends to the downcomer (121), and a secondary air hole (132) is provided at the extension portion. The air channel (13) is connected to the secondary air hole (132) via a preheating air outlet (135), so that the preheating air in the air channel (13) enters the heating flue (14) through the downcomer (121) and burns with the raw coal gas.

2. The horizontal heat recovery coke oven according to claim 1, characterized in that: The carbonization chamber (10) further comprises a raw gas balance channel (103); The raw gas balance channel (103) and the raw gas crossing hole (102) are arranged side by side; The raw gas balancing channel (103) is arranged between the coke oven inner arch (101) and the coke oven outer arch (111), and extends toward a side away from the coke oven outer arch (111), so as to be connected to the carbonization chamber (10) of the adjacent horizontal heat recovery coke oven (1).

3. The horizontal heat recovery coke oven according to claim 1, characterized in that: Also includes: An exhaust gas pipe (16) is arranged outside the coke oven outer arch (111) and is used to discharge the exhaust gas generated by combustion out of the furnace body; The ascending fire duct (122) is arranged on a side of the heating flue (14) away from the descending fire duct (121), and the heating flue (14) and the exhaust gas pipe (16) are connected through the ascending fire duct (122).

4. The horizontal heat recovery coke oven according to claim 1, characterized in that: The cooling air passage (171) and the preheated air collecting duct (15) are arranged at the same height on the coke oven bottom plate (17).

5. The horizontal heat recovery coke oven according to claim 1, characterized in that: The primary air hole (131) is an air hole with adjustable positive pressure; The secondary air hole (132) adjusts the air intake volume through a regulating brick arranged outside the horizontal heat recovery coke oven (1).

6. The horizontal heat recovery coke oven according to claim 1, characterized in that: The top of the coke oven outer arch (111) is coated with a heat-insulating coating (4); The high-reflective infrared coating (5) is coated on the side of the heat-insulating coating (4) at the top of the coke oven outer arch (111) away from the coke oven outer arch (111); The top of the coke oven inner arch (101) is coated with a high-emission infrared paint (6); The bottom and side walls of the heating flue (14) are coated with a heat-insulating coating (4); The heat-insulating paint (4) at the bottom and side wall of the heating flue (14) is coated with the high-reflective infrared paint (5) on the side away from the bottom and side wall of the heating flue (14); A high-emission infrared paint (6) is coated on the top of the heating flue (14).

Images