Vertical coke oven and coke making system and method thereof

Abstract

The application discloses a vertical coke making furnace and a coke making system and method thereof, wherein the vertical coke making furnace comprises a furnace body, a carbonization section, an activation section and a cooling section which are sequentially arranged from top to bottom in the furnace body and are in communication with each other; the carbonization section is provided with an air grid, the top of the carbonization section is communicated with a raw material inlet on the furnace body, and a gas outlet is arranged on the side wall of the furnace body corresponding to the carbonization section; a plurality of material channels, a flue gas channel and an activation steam grid are arranged in the activation section; the plurality of material channels are annular channels surrounded by silicon carbide plates; the upper ends of the plurality of material channels are communicated with the carbonization section, and the lower ends of the plurality of material channels are communicated with the cooling section; and the flue gas channel is a region in the activation section located outside the plurality of material channels. The vertical coke making furnace has the advantages that raw coal particles are used as raw materials, one-step carbonization and activation are realized through the vertical coke making furnace, the heat exchange efficiency inside the coke making furnace is high, the layout is compact, the operation flexibility and the raw material adaptability of the coke making system are remarkably improved, the yield of the coke making furnace is improved, and the coke making cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material preparation, and particularly relates to a vertical coke making furnace and a coke making system and method thereof. BACKGROUND

[0002] Coal is not only a fuel, but also a cheap and readily available raw material for preparing carbon materials. Currently, the active coke used for desulfurization and denitrification is prepared from coal. The existing carbonization and activation equipment for preparing active coke is a horizontal rotary furnace and a vertical Slep furnace. The horizontal rotary furnace rotates the furnace body at a certain angle to realize material overturning, thereby realizing material carbonization and activation with activator. However, the horizontal rotary furnace has problems such as large floor area, high investment cost, and low temperature control precision. The vertical Slep furnace has a material passage and flues arranged alternately, and the flues and the material passage are both thin-layer cuboid passages. The material passage is made of refractory bricks, and the cross-sectional proportion of the brick body is large, resulting in a large furnace size. In addition, the heat transfer performance of the refractory bricks is poor, which leads to slow start and adjustment rate of the coke making furnace, and the coke making system cannot realize flexible adjustment and raw material adaptability.

[0003] The material passage and the flues of the vertical Slep furnace are arranged alternately, and the furnace body is arranged in a square shape. The flues and the material passage are both thin-layer cuboid passages, the material passage has a small width, and the cross-sectional proportion of the refractory bricks is large, resulting in a large furnace size. The generation of activation steam of the vertical Slep furnace is realized by switching the left and right combustion chambers and the generation of the activation steam is complex, and the steam temperature is uncontrollable. The Slep furnace has a large heat storage capacity, and the refractory bricks need to be heated to a certain temperature before starting. The start and stop time of the furnace is very long, and the operation flexibility is poor. The Slep furnace is suitable for fixed particles and specific operating parameters, and the raw material adaptability is poor. SUMMARY

[0004] Therefore, one object of the present application is to provide a vertical coke making furnace, which uses raw coal particles as raw materials and realizes one-step carbonization and activation through the vertical coke making furnace. The internal heat exchange efficiency of the coke making furnace is high, the layout is compact, the operation flexibility and raw material adaptability of the coke making system are significantly improved, the yield of the coke making furnace is improved, and the coke making cost is reduced.

[0005] Another object of the present application is to provide a coke making system.

[0006] Still another object of the present application is to provide a coke making method.

[0007] To achieve the above objects, a vertical coke making furnace is provided in the first aspect of the present application, which comprises a furnace body, and a carbonization section, an activation section and a cooling section are arranged in the furnace body in sequence from top to bottom.

[0008] The carbonization section is provided with an air grid, the top of the carbonization section is communicated with a raw material inlet on the furnace body, and a gas outlet is arranged on the side wall of the furnace body corresponding to the carbonization section.

[0009] The activation section is provided with a plurality of material channels, a flue gas channel and an activation steam grid; the plurality of material channels are all annular channels surrounded by silicon carbide plates; the upper ends of the plurality of material channels are all connected to the carbonization section, and the lower ends of the plurality of material channels are all connected to the cooling section; oxygen supplement pipelines are arranged in the plurality of material channels; the flue gas channel is the area in the activation section located outside the plurality of material channels, and the flue gas channel is connected to a flue gas inlet and a flue gas outlet; the activation steam grid is arranged at the bottom of the plurality of material channels and is connected to the plurality of material channels;

[0010] The cooling section is provided with cooling pipes, and the cooling section is connected to an activated coke outlet on the furnace body.

[0011] In addition, the vertical coke oven proposed according to the above embodiments of the present invention may further have the following additional technical features:

[0012] In some embodiments of the present invention, gaps are left between the plurality of material channels and between the plurality of material channels and the inner wall of the furnace body.

[0013] In some embodiments of the present invention, the plurality of material channels are distributed in a "field" shape in the activation section.

[0014] In some embodiments of the present invention, the gas outlet, the flue gas inlet and the flue gas outlet are all arranged on the side wall of the furnace body, the flue gas inlet is arranged at the bottom of the activation section, and the flue gas outlet is arranged at the top of the activation section; the air grid is arranged at the bottom of the carbonization section, and the gas outlet is arranged above the air grid.

[0015] To achieve the above object, the second aspect embodiment of the present invention proposes a coking system, including the vertical coke oven, a combustion furnace, a heat exchanger, an air preheater and a process water tank described in the embodiments of the present invention;

[0016] The gas outlet of the vertical coke oven is sequentially connected to a gas treatment unit, a draft fan and the inlet of the combustion furnace;

[0017] The flue gas outlet of the combustion furnace is divided into two paths, one path is connected to the flue gas inlet of the vertical coke oven, and the other path is connected to the flue gas outlet pipeline of the vertical coke oven;

[0018] The hot side inlet of the heat exchanger is connected to the flue gas outlet pipeline of the vertical coke oven, and the hot side outlet of the heat exchanger is sequentially connected to the flue gas side of the air preheater and the chimney;

[0019] The inlet of the air preheater is connected to a blower; the outlet of the air preheater is divided into two paths, one path is connected to the air grid and the oxygen supplement pipeline, and the other path is connected to the inlet of the combustion furnace;

[0020] The process water tank is provided with a first inlet, a first outlet and a second outlet; the first inlet is communicated with the outlet of the cooling pipe, the first outlet is communicated with the inlet of the cooling pipe, and the second outlet is communicated with the cold side of the heat exchanger, the heat exchange channel in the combustion furnace and the activated steam grid in sequence.

[0021] In some embodiments of the present application, the gas treatment unit comprises a washing tower and an electric tar precipitator communicated in sequence; the inlet of the washing tower is communicated with the gas outlet of the vertical coke oven, and the outlet of the electric tar precipitator is communicated with the inlet of the induced draft fan.

[0022] In some embodiments of the present application, the coke making system further comprises a combustible gas storage tank; the inlet of the combustible gas storage tank is communicated with the outlet of the electric tar precipitator, and the outlet of the combustible gas storage tank is communicated with the inlet of the induced draft fan.

[0023] In some embodiments of the present application, the coke making system further comprises a first valve and a liquefied gas storage tank; the first valve is installed on the communication pipeline between the flue gas outlet of the combustion furnace and the flue gas outlet pipeline of the vertical coke oven; and the outlet of the liquefied gas storage tank is communicated with the inlet of the combustion furnace.

[0024] In some embodiments of the present application, the process water tank further comprises a second inlet communicated with a water supplementing pump; a feed water pump is installed on the communication pipeline between the second outlet and the cold side of the heat exchanger; and a circulating cooling pump is installed on the communication pipeline between the first outlet and the inlet of the cooling pipe.

[0025] To achieve the above-mentioned purpose, the third aspect of the present application provides a coke making method, comprising

[0026] The furnace body is controlled to be in a negative pressure state;

[0027] The raw coal particles enter the carbonization section and are heated and carbonized by the mixed gas composed of the unreacted water vapor and water gas from the activation section, the mixed gas enters the gas treatment unit for purification, the purified mixed gas provides combustible gas for the combustion furnace, generates water vapor and flue gas;

[0028] The carbonized material enters the material channel of the activation section, indirectly exchanges heat with part of the flue gas from the combustion furnace in the flue gas channel, and is activated by contacting with water vapor; the mixed gas composed of the unreacted water vapor and water gas enters the carbonization section from bottom to top, the heat-exchanged flue gas flows out of the furnace body, is combined with another part of the flue gas from the combustion furnace, is cooled by the heat exchanger and the air preheater, and then enters the chimney; part of the heated air of the air preheater enters the combustion furnace, another part of the heated air of the air preheater enters the air grid in two ways, one way is to supplement heat for the carbonization section and control the generation of tar, and the other way is to enter the oxygen supplement pipeline to supplement air for the activation section to supplement the activation heat of the material self-ignition;

[0029] The activated active coke enters a cooling section, is cooled by process water, and is discharged.

[0030] In some embodiments of the present application, the temperature of the water vapor entering the furnace body is 500-600 DEG C, and the temperature of the mixed gas entering the gas treatment unit is 350-400 DEG C.

[0031] The vertical coke making furnace of the embodiments of the present application has the following beneficial effects:

[0032] (1) High heat exchange efficiency, compact structure, and large output.

[0033] The material channel of the activation section is made of silicon carbide plate, which has high strength, high heat transfer efficiency, and high speed, and the cross-sectional proportion of the silicon carbide plate in the furnace body space is small, so that the space utilization rate of the coke making furnace is high, the structure is compact, the land occupation area is small, the investment cost is low, the output is large, and the coke making cost is low.

[0034] (2) Small heat storage capacity and good running flexibility.

[0035] The internal part of the coke making furnace is made of high-strength and high-heat-transfer-coefficient silicon carbide plate, which separates the high-temperature flue gas and the material, and the silicon carbide plate is thin and has high heat exchange efficiency, so that the coke making furnace has small heat storage capacity and very good running flexibility.

[0036] (3) The air grid pipeline is arranged in the carbonization section, which can control the preliminary oxidation of tar, reduce the viscosity of tar, and reduce the risk of tar precipitation and material sticking.

[0037] (4) The raw material enters the vertical coke making furnace and continuously undergoes the carbonization and activation processes to obtain active coke particles, and the preparation process is simple.

[0038] The coke making system of the embodiments of the present application has the following beneficial effects in addition to the beneficial effects of the vertical coke making furnace of the embodiments of the present application:

[0039] (1) The activation temperature is controllable, and the heat utilization efficiency is high.

[0040] The activation water vapor sequentially passes through the cooling section of the coke making furnace, the heat exchanger, the combustion furnace, and the flue superheating process, the waste heat of the active coke and the high-temperature flue gas are fully utilized, the system has high heat utilization efficiency, and by adjusting the cold end flow of the combustion furnace and the heat exchange equipment, the activation steam temperature can be controlled and adjusted.

[0041] (2) The raw material adaptability of the coke making furnace is good.

[0042] The furnace channel temperature and the activation temperature of the coke making furnace can be quickly adjusted for different coal types and coke making process parameters, and the raw material adaptability is good.

[0043] (3) The pyrolysis gas and the water gas are collected after purification and controlled combustion.

[0044] The pyrolysis gas from the carbonization section and the water gas from the activation section are discharged from the coke oven after heat exchange, collected after purification, used for heating the activation steam and generating high-temperature flue gas, and the combustion is controllable and the system heat distribution is adjustable.

[0045] (4) The gas treatment unit is arranged at the gas outlet of the coke oven, which is beneficial to the safe operation of the combustion furnace.

[0046] Additional aspects and advantages of the present application will be set forth in part in the following description, will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0048] Figure 1 is a simple structure schematic diagram of a vertical coke oven according to an embodiment of the present application.

[0049] Figure 2 is a simple horizontal section view of an activation section of a vertical coke oven according to an embodiment of the present application.

[0050] Figure 3 is a structure schematic diagram of a coke making system according to an embodiment of the present application.

[0051] REFERENCE SIGNS:

[0052] 1 - coke oven; 101 - oven body; 102 - carbonization section; 103 - activation section; 104 - cooling section; 105 - raw material inlet; 106 - gas outlet; 107 - flue gas inlet; 108 - flue gas outlet; 109 - active coke outlet; 2 - scrubbing tower; 3 - electric oil catcher; 4 - combustible gas storage tank; 5 - first valve; 6 - liquefied gas storage tank; 7 - combustion furnace; 8 - heat exchanger; 9 - air preheater; 10 - air blower; 11 - chimney; 12 - water supplement pump; 13 - circulating cooling pump; 14 - process water tank; 15 - water supply pump; 16 - material channel; 17 - oxygen supplement pipeline; 18 - activation steam grid; 19 - cooling pipe; 20 - induced draft fan; 21 - air grid; 22 - flue gas passage; 23 - silicon carbide plate. DETAILED DESCRIPTION

[0053] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0054] The vertical coke-making furnace, coke-making system and coke-making method are described below with reference to the accompanying drawings.

[0055] Figure 1 Figure 1 is a schematic diagram of the main structure of a vertical coke-making furnace according to an embodiment of the present application.

[0056] As shown in Figure 1 , the vertical coke-making furnace according to an embodiment of the present application comprises a furnace body 1, and a carbonization section 102, an activation section 103 and a cooling section 104 are sequentially arranged in the furnace body 1. The carbonization section 102 is provided with an air grid 21, and the top of the carbonization section 102 is connected to a raw material inlet 105 on the furnace body 1. A gas outlet 106 is arranged on the side wall of the furnace body 1 corresponding to the carbonization section 102. The activation section 103 is provided with a plurality of channels 16, a flue gas passage 22 and an activation steam grid 18. The plurality of channels 16 are annular passages formed by silicon carbide plates 23. The upper ends of the plurality of channels 16 are connected to the carbonization section 102, and the lower ends of the plurality of channels 16 are connected to the cooling section 104. Oxygen supplement pipelines 17 are arranged in the plurality of channels 16. The flue gas passage 22 is a region outside the plurality of channels 16 in the activation section 103, and is connected to a flue gas inlet 107 and a flue gas outlet 108. The activation steam grid 18 is arranged at the bottom of the plurality of channels 16 and is connected to the plurality of channels 16. The cooling section 104 is provided with a cooling pipe 19, and is connected to an active coke outlet 109 on the furnace body 1.

[0057] The vertical coke-making furnace according to an embodiment of the present application has the following advantages:

[0058] (1) High heat exchange efficiency, compact structure and large output.

[0059] The channels in the activation section are made of silicon carbide plates, which have high strength, high heat exchange efficiency and high speed. The cross-sectional area of the silicon carbide plates in the furnace body is small, and the space utilization rate of the coke-making furnace is high. The coke-making furnace has a compact structure, small footprint, low investment cost, large output and low coke-making cost.

[0060] (2) Small heat storage capacity and good running flexibility.

[0061] The internal structure of the coke-making furnace is made of high-strength silicon carbide plates with high heat transfer coefficient. The high-temperature flue gas and the material are separated by the silicon carbide plates, which are thin and have high heat exchange efficiency. Therefore, the coke-making furnace has a small heat storage capacity and very good running flexibility.

[0062] (3) The air grid pipeline in the carbonization section can control the preliminary oxidation of tar, reduce the viscosity of tar, and reduce the risk of tar precipitation and material sticking.

[0063] (4) The raw material enters the vertical coke-making furnace and continuously undergoes the carbonization and activation processes to obtain active coke particles. The preparation process is simple.

[0064] As a possible example, the raw material inlet 105 is provided at the top of the furnace body, and the activated coke outlet 109 is provided at the bottom of the furnace body. The raw material inlet 105 has a conical structure with a smaller upper part and a larger lower part, and the activated coke outlet 109 has a conical structure with a larger upper part and a smaller lower part. Optionally, a feed valve can be installed at the raw material inlet, and a discharge valve can be installed at the activated coke outlet to facilitate the control of feeding and discharging.

[0065] As a possible example, gaps are left between several material channels 16 and between several material channels 16 and the inner wall of the furnace body 1 to form a flue gas channel 22, ensuring that the high-temperature flue gas in the flue gas channel has the largest possible contact area with each material channel and improving the heat exchange efficiency. Optionally, in some embodiments, the number of material channels may be 1, 2, or 3. At this time, as long as gaps are left between several material channels 16 and between several material channels 16 and the inner wall of the furnace body 1. It can be understood that the more material channels there are, the more complex the processing is, but the smaller the size of a single material channel, the less material it passes through, and the higher its heat exchange efficiency with the high-temperature flue gas in the flue gas channel; the fewer material channels there are, although it is easier to process, the heat exchange efficiency decreases accordingly. Therefore, the number of material channels needs to be kept within a reasonable range. Optionally, in some other embodiments, the number of material channels is more than 4, and several material channels 16 are distributed in a "field" shape in the activation section 103. For example, as Figure 2 shown, there are 4 material channels in the activation section, and the 4 material channels are distributed in a "field" shape. It should be noted here that multiple material channels can be set as needed, and as long as 4 adjacent material channels form a "field" shape.

[0066] Regarding the connection structure between the activation section and the carbonization section and the cooling section, a possible example is as follows: A first partition is provided at the part of the furnace body between the carbonization section and the activation section. The four sides of the first partition are welded to the inner side wall of the furnace body, and several first mounting holes are opened on the first partition; each first mounting hole corresponds to a material channel and is connected to the material channel (such as coaxially arranged), and the top of the material channel is welded to the periphery of the first mounting hole corresponding to it on the first partition; the first partition can be made of a silicon carbide plate. A second partition is provided at the part of the furnace body between the activation section and the cooling section. The four sides of the second partition are welded to the inner side wall of the furnace body, and several second mounting holes are opened on the second partition; each second mounting hole corresponds to a material channel and is connected to the material channel (such as coaxially arranged), and the bottom of the material channel is welded to the periphery of the second mounting hole corresponding to it on the second partition; the second partition can be made of a silicon carbide plate.

[0067] Optionally, the gas outlet 106, the flue gas inlet 107 and the flue gas outlet 108 are arranged on the side wall of the furnace body 1, the flue gas inlet 107 is arranged at the bottom of the activation section 103, and the flue gas outlet 108 is arranged at the top of the activation section 103. In use, the high-temperature flue gas enters from the flue gas inlet at the bottom of the activation section, exchanges heat indirectly with the material in the flue gas channel outside the silicon carbide material channel, and finally is discharged from the flue gas outlet at the top of the activation section. Optionally, the air grid 21 is arranged at the bottom of the carbonization section 102, and the gas outlet 106 is arranged above the air grid 21. The air grid pipeline is arranged at the bottom of the carbonization section, which has three functions: 1. Supplement heat: supplement a certain amount of air to ensure that the tar, volatile matter and water gas are preliminarily combusted to provide heat for the carbonization section; 2. Control tar: preliminary oxidation of tar to prevent sticking; 3. Carry out tar: the flue gas generated after the combustion of the supplemented air is more likely to carry out the tar. Arranging the gas outlet above the air grid makes it easier for the flue gas generated after the combustion of the supplemented air to carry out the tar.

[0068] Optionally, the activation steam grid 18 is arranged at the bottom of the plurality of material channels 16, the steam nozzles of the activation steam grid 18 are directed to one side of the material channels, and only the steam nozzles corresponding to the material channels are arranged, so that the steam can only enter the material channels. It should be noted that the activation steam grid, the air grid and the oxygen supplement grid in the present application can all adopt the structure of the existing ammonia injection grid. The steam of the activation steam grid 18 first enters the material channels 16 and contacts the material, then enters the carbonization section and directly contacts the material, and finally is discharged from the gas outlet of the carbonization section.

[0069] Optionally, in some embodiments, the thickness of the silicon carbide plate is between 5-10 cm. The use of silicon carbide plates has a simple heat exchange structure and high heat exchange efficiency.

[0070] The operation method of the vertical coke making furnace in the embodiment of the present application is as follows:

[0071] The raw coal particles pass through the carbonization section 102, the activation section 103 and the cooling section 104 of the coke making furnace from top to bottom, and the finished active coke is discharged from the bottom of the coke making furnace; the material in the carbonization section 102 is heated by the mixed gas composed of the unreacted water vapor and the water gas in the activation section 103, the material flows in the material channel 16 surrounded by the silicon carbide plate 23 in the activation section 103, the high-temperature flue gas flows in the flue gas channel 22 outside the material channel 16, the high-temperature flue gas and the material exchange heat indirectly, the activation water vapor enters from the bottom of the activation section 103 and directly contacts the material for activation, and the oxygen supplement pipeline 17 is arranged in the material layer of the activation section 103 to control the spontaneous combustion of the material and supplement the heat in the activation process.

[0072] As Figure 3As shown, the coke making system of the embodiment of the present application comprises a vertical coke making furnace 1, a combustion furnace 7, a heat exchanger 8, an air preheater 9 and a process water tank 14; wherein the vertical coke making furnace adopts the vertical coke making furnace of the embodiment of the present application, the gas outlet 106 of the vertical coke making furnace 1 is sequentially communicated with a gas treatment unit, an induced draft fan 20 and an inlet of the combustion furnace 7; a flue gas outlet 108 of the combustion furnace 7 is divided into two routes, one of which is communicated with a flue gas inlet 107 of the vertical coke making furnace 1, and the other of which is communicated with a flue gas outlet 108 pipeline of the vertical coke making furnace 1; a hot side inlet of the heat exchanger 8 is communicated with the flue gas outlet 108 pipeline of the vertical coke making furnace, and a hot side outlet of the heat exchanger 8 is sequentially communicated with a flue gas side of the air preheater 9 and a chimney 11; an inlet of the air preheater 9 is communicated with a blower 10; an outlet of the air preheater 9 is divided into two routes, one of which is communicated with an inlet of an air grille 21 and an inlet of an oxygen supplement pipeline 17, and the other of which is communicated with an inlet of the combustion furnace 7; the process water tank 14 is provided with a first inlet, a first outlet and a second outlet; the first inlet is communicated with an outlet of a cooling pipe 19, the first outlet is communicated with an inlet of the cooling pipe 19, and the second outlet is sequentially communicated with a cold side of the heat exchanger 8, a heat exchange channel in the combustion furnace 7 and an activation steam grille 18.

[0073] In the present application, the composition of the gas treatment unit is not limited, as long as it can purify the mixed gas (such as pyrolysis gas and water gas) containing tar, water vapor and the like discharged from the activation section and the carbonization section of the furnace body during the preparation of the active coke. As a possible example, the gas treatment unit comprises a scrubber 2 and an electric tar precipitator 3 communicated in sequence by pipelines or the like, wherein the inlet of the scrubber 2 is communicated with the gas outlet 106 of the vertical coke making furnace 1 by pipelines or the like, and the outlet of the electric tar precipitator 3 is communicated with the inlet of the induced draft fan 20 by pipelines or the like. The gas treatment unit is arranged at the gas outlet of the coke making furnace (i.e. the gas outlet), and the mixed gas (such as pyrolysis gas and water gas) containing tar, water vapor and the like discharged from the coke making furnace is subjected to purification treatment, which is beneficial to the safe operation of the subsequent combustion furnace.

[0074] Optionally, in order to store the purified mixed gas for convenient reuse, in some embodiments, the coke making system of the present application further comprises a combustible gas storage tank 4; the inlet of the combustible gas storage tank 4 is communicated with the outlet of the electric tar precipitator 3, and the outlet of the combustible gas storage tank 4 is communicated with the inlet of the induced draft fan 20. The furnace body inside the coke making furnace can be controlled to be under negative pressure by the induced draft fan, such as the pressure range of (-50) to (-100) Pa. The furnace is operated under negative pressure, the carbonization section also supplements air, the preliminary oxidation of tar can be controlled, the viscosity of tar is reduced, the risk of tar precipitation and material sticking is reduced, thereby the risk of tar plugging is controlled, and at the same time, it is beneficial to the water vapor in the activation steam grille entering the material channel.

[0075] Optionally, to control the flow rate of high-temperature flue gas diverted to the flue gas passage, the coking system also includes a first valve 5, which is installed on the connecting pipeline between the flue gas outlet 108 of the combustion furnace 7 and the flue gas outlet 108 of the vertical coking oven. The first valve 5 can be a high-temperature baffle valve or the like.

[0076] Optionally, the coking system also includes a liquefied gas storage tank 6, which serves as a heat source for system startup and system reheating; the outlet of the liquefied gas storage tank 6 is connected to the inlet of the combustion furnace 7 via pipelines, etc.

[0077] Optionally, the process water tank 14 also includes a second inlet connected to a makeup water pump 12; a feed water pump 15 is installed on the connecting pipeline between the second outlet and the cold side of the heat exchanger 8; and a circulating cooling pump 13 is installed on the connecting pipeline between the first outlet and the inlet of the cooling pipe 19.

[0078] Optionally, the inlet steam temperature of the activation steam grid 18 of the coking oven is controlled at 500-600℃; to prevent tar condensation, the outlet temperature of the precipitated gas discharged from the carbonization section is 350-400℃.

[0079] It should be noted that valves can be installed on the corresponding connecting pipelines of this invention as needed to control the flow of the corresponding medium.

[0080] The operation method of the coking system in this embodiment of the invention is as follows:

[0081] like Figure 3 As shown, raw coal particles pass through the carbonization section 102, activation section 103, and cooling section 104 of the coking oven from top to bottom, and the finished activated coke is discharged from the bottom of the coking oven. In the carbonization section 102, the material is heated by a mixture of unreacted water vapor and water gas in the activation section 103. In the activation section 103, the material flows in the material channel 16 surrounded by silicon carbide plates 23, and the high-temperature flue gas flows in the flue gas channel 22 outside the material channel 16. The high-temperature flue gas and the material exchange heat indirectly. Activation water vapor enters from the bottom of the activation section 103 and directly contacts the material for activation. An oxygen supply pipeline 17 is also arranged in the material layer of the activation section 103 to control the spontaneous combustion of the material and to supplement the heat during the activation process.

[0082] The process water is cooled by circulating cooling pump 13 first, and then is continuously heated by feed water pump 15 through heat exchanger 8, combustion furnace 7, and is activated by directly contacting with the material through activation steam grid 18, and a small amount of air is supplied through oxygen supplement pipeline 17 for supplementing the activation heat of the material self-ignition, and the activation steam is heated at the same time, so that the activation quality is ensured, and the mixed gas composed of unreacted water vapor and water gas generated in the activation is in countercurrent contact with the material, and then is discharged after being heated and cooled by the carbonization section, and the mixed gas is cooled and washed and purified by washing tower 2, and then enters electric tar precipitator 3 to remove residual tar particles, and is stored in combustible gas storage tank 4 to provide combustible gas for combustion furnace 7. The high-temperature flue gas generated by combustion furnace 7 partly enters the flue gas channel 22 of the activation section, and the other part is combined with the flue gas discharged from the activation section, and then enters the hot side of heat exchanger 8 to heat the process water, and then enters air preheater 9 to heat the air, and finally enters chimney 11 to be discharged. Part of the air heated by air preheater 9 enters combustion furnace 7, and the other part enters air grid 21 and oxygen supplement pipeline 17, and air grid 21 supplies heat to carbonization section 102 while controlling the generation of tar and carrying the tar out of furnace body 1; oxygen supplement pipeline 17 supplies air to activation section 103 for supplementing the activation heat of the material self-ignition.

[0083] As shown in Figure 3 , the coking method of the embodiment of the application comprises the following steps:

[0084] (1) The pressure in furnace body 1 is controlled to be negative by induced draft fan 20, for example, the pressure range is (-50) to (-100) Pa.

[0085] (2) The raw coal particles enter carbonization section 102 and are heated and carbonized by the mixed gas composed of unreacted water vapor and water gas from activation section 103, the mixed gas enters the gas treatment unit for purification, and the purified mixed gas provides combustible gas for combustion furnace 7 to generate water vapor and flue gas.

[0086] (3) The carbonized material enters the material channel 16 of activation section 103, is indirectly heated with the part of flue gas from combustion furnace 7 in flue gas channel 22, and is activated by contacting with water vapor, the mixed gas composed of unreacted water vapor and water gas enters carbonization section 102 from bottom to top, the heated flue gas flows out of furnace body 1 and is combined with the other part of flue gas from combustion furnace 7, and then is cooled by heat exchanger 8 and air preheater 9, and then enters chimney 11, part of the air heated by air preheater 9 enters combustion furnace 7, and the other part enters air grid 21 and oxygen supplement pipeline 17; air grid 21 supplies heat to carbonization section 102 while controlling the generation of tar and carrying the tar out of furnace body 1; oxygen supplement pipeline 17 supplies air to activation section 103 for supplementing the activation heat of the material self-ignition.

[0087] (4) The activated active coke enters the cooling section 104, and is discharged after being cooled by process water. The process water discharged from the furnace body 1 is continuously heated by the heat exchanger 8 and the combustion furnace 7, and then enters the combustion furnace 7.

[0088] Optionally, in some embodiments, the temperature of the water vapor entering the furnace body 1 (i.e., the steam grid 18 inlet) is controlled to be 500-600°C; and the temperature of the mixed gas entering the gas treatment unit (i.e., the gas discharged from the carbonization section gas outlet) is controlled to be 350-400°C, which can prevent tar condensation.

[0089] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0090] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0091] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0093] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0094] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A vertical coking oven, characterized in that, It includes a furnace body, and a carbonization section, an activation section and a cooling section which are connected to each other from top to bottom are arranged in the furnace body; An air grille is arranged in the carbonization section. The top of the carbonization section is connected to the raw material inlet on the furnace body, and a gas outlet is arranged on the side wall of the furnace body corresponding to the carbonization section; A plurality of material channels, a flue gas channel and an activation steam grille are arranged in the activation section; the plurality of material channels are all annular channels surrounded by silicon carbide plates; the upper ends of the plurality of material channels are all connected to the carbonization section, and the lower ends of the plurality of material channels are all connected to the cooling section; oxygen supplement pipelines are arranged in the plurality of material channels; the flue gas channel is the area in the activation section located outside the plurality of material channels, and the flue gas channel is connected to a flue gas inlet and a flue gas outlet; the activation steam grille is arranged at the bottom of the plurality of material channels and is connected to the plurality of material channels; Cooling pipes are arranged in the cooling section, and the cooling section is connected to the activated coke outlet on the furnace body; The plurality of material channels are distributed in a "field" shape in the activation section; The air grille is arranged at the bottom of the carbonization section, and the gas outlet is arranged above the air grille; The steam nozzles of the activation steam grille face the side where the material channels are located, and steam nozzles are only arranged at positions corresponding to the material channels.

2. The vertical coking oven according to claim 1, characterized in that, Spacings are left between the plurality of material channels and between the plurality of material channels and the inner wall of the furnace body.

3. The vertical coking oven according to claim 1, characterized in that, The gas outlet, the flue gas inlet and the flue gas outlet are all arranged on the side wall of the furnace body. The flue gas inlet is arranged at the bottom of the activation section, and the flue gas outlet is arranged at the top of the activation section.

4. A coking system, characterized in that, It includes a vertical coke oven, a combustion furnace, a heat exchanger, an air preheater and a process water tank according to any one of claims 1 to 3; The gas outlet of the vertical coke oven is sequentially connected to a gas treatment unit, an induced draft fan and the inlet of the combustion furnace; The flue gas outlet of the combustion furnace is divided into two paths. One path is connected to the flue gas inlet of the vertical coke oven, and the other path is connected to the flue gas outlet pipeline of the vertical coke oven; The hot side inlet of the heat exchanger is connected to the flue gas outlet pipeline of the vertical coke oven, and the hot side outlet of the heat exchanger is sequentially connected to the flue gas side of the air preheater and the chimney; The inlet of the air preheater is connected to a blower; the outlet of the air preheater is divided into two paths. One path is connected to the air grille and the oxygen supplement pipeline, and the other path is connected to the inlet of the combustion furnace; The process water tank has a first inlet, a first outlet and a second outlet; the first inlet is connected to the outlet of the cooling pipe, the first outlet is connected to the inlet of the cooling pipe, and the second outlet is sequentially connected to the cold side of the heat exchanger, the heat exchange channel in the combustion furnace and the activation steam grille.

5. The coking system according to claim 4, characterized in that, The gas treatment unit includes a scrubbing tower and an electrostatic tar precipitator connected in sequence; the inlet of the scrubbing tower is connected to the gas outlet of the vertical coke oven, and the outlet of the electrostatic tar precipitator is connected to the inlet of the induced draft fan.

6. The coking system according to claim 5, characterized in that, It further includes a combustible gas storage tank; the inlet of the combustible gas storage tank is connected to the outlet of the electrostatic tar precipitator, and the outlet of the combustible gas storage tank is connected to the inlet of the induced draft fan.

7. The coking system according to claim 4, characterized in that, It further includes a first valve and a liquefied gas storage tank; the first valve is installed on the connecting pipeline between the flue gas outlet of the combustion furnace and the flue gas outlet pipeline of the vertical coke oven; the outlet of the liquefied gas storage tank is connected to the inlet of the combustion furnace.

8. The coking system according to claim 4, characterized in that, The process water tank also includes a second inlet, which is connected to a makeup water pump; a feed water pump is installed on the pipeline connecting the second outlet to the cold side of the heat exchanger; and a circulating cooling pump is installed on the pipeline connecting the first outlet to the inlet of the cooling pipe.

9. A method for producing coke using the coking system as described in any one of claims 4 to 8, characterized in that, include Maintain a negative pressure state inside the furnace; Raw coal particles enter the carbonization section, where they are heated and carbonized by a mixture of unreacted water vapor and water gas from the activation section. The mixture then enters the gas treatment unit for purification, and the purified mixture provides combustible gas to the combustion furnace, producing water vapor and flue gas. After carbonization, the material enters the feed channel of the activation section, where it indirectly exchanges heat with part of the flue gas from the combustion furnace in the flue gas channel and is activated by contact with water vapor. The flue gas that has undergone heat exchange flows out of the furnace body and merges with another part of the flue gas from the combustion furnace. After passing through a heat exchanger and an air preheater, it is cooled down and then enters the chimney. Part of the air heated by the air preheater enters the combustion furnace, and the other part is divided into two paths. One path enters the air grid to supplement the heat of the carbonization section while controlling the production of tar and carrying the tar out of the furnace body. The other path enters the oxygen supply pipeline to supplement the activation section with air for the material to spontaneously combust and supplement the activation heat. The activated coke enters the cooling section, is cooled by process water, and then discharged. The process water coming out of the furnace body is continuously heated through the heat exchanger and the combustion furnace before entering the combustion furnace.

10. The method according to claim 9, characterized in that, The temperature of the steam entering the furnace is 500-600℃, and the temperature of the mixed gas entering the gas processing unit is 350-400℃.

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