CN113184852A - Production device for calcium carbide co-production lime - Google Patents
Production device for calcium carbide co-production lime Download PDFInfo
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- CN113184852A CN113184852A CN202110561807.2A CN202110561807A CN113184852A CN 113184852 A CN113184852 A CN 113184852A CN 202110561807 A CN202110561807 A CN 202110561807A CN 113184852 A CN113184852 A CN 113184852A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/942—Calcium carbide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/108—Treatment or selection of the fuel therefor
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Abstract
The invention relates to a production device for calcium carbide co-production lime, which comprises a fixed calcium carbide furnace, a vertical fixed gasification furnace and a dividing wall lime rotary kiln. The fixed calcium carbide furnace is provided with a tail gas chamber, a hearth and a calcium carbide collecting chamber, the vertical fixed gasification furnace is provided with a gas chamber, a hearth and a slag collecting chamber, and the dividing wall lime rotary kiln is provided with a kiln hearth and a lime calcining space. The fixed calcium carbide furnace and the vertical fixed gasification furnace are connected into a whole. The gas chamber and the tail gas chamber are connected to a gas burner together through a kiln chamber, a pulverized coal preheater, a No. 2 dust remover, a No. 2 induced draft fan and a gas regenerative furnace. The flue gas of the vertical fixed gasification furnace is preheated by coal gas and air, then is subjected to dust removal and nitrogen separation, and is connected to a pulverized coal distributor on one path and a waste gas discharge system on the other path. According to the invention, the residual heat of the flue gas generated in the calcium carbide production process is utilized to gasify and heat and calcine lime, so that the heat and combustible gas generated in the calcium carbide production are fully utilized, the energy consumption of the calcium carbide production is reduced, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgical chemical production, and relates to a production device for calcium carbide co-production lime.
Background
Calcium carbide, molecular formula CaC2Commonly known as calcium carbide, calcium carbide reacts with water to produce acetylene. Acetylene is an important chemical raw material, is mainly used for producing polyvinyl chloride, vinyl acetate and acrylic acid-based series products, and more than 70 percent of PVC products in China are derived from acetylene produced by calcium carbide. China is in shortage of petroleum resources and coal resources are relatively rich, so that the calcium carbide industry is determined to play an irreplaceable role in meeting downstream requirements.
The calcium carbide production has high energy consumption, and the traditional calcium carbide production method is an electric heating method, namely, the calcium carbide product is obtained from calcium carbide raw materials by an electric heating method. The energy consumption cost of calcium carbide production accounts for a large proportion of the total production cost, and belongs to the high energy consumption industry. Because electricity is a secondary energy source (the heat energy utilization rate of thermal power generation is about 30% -40%), the production cost of calcium carbide is high when calcium carbide is produced by an electric heating method, and the industrial calcium carbide is lack of competitiveness in the market. The coal gasification calcium carbide production uses coal or coke incomplete combustion (high-temperature gasification) to provide heat, breaks through the limitation of power generation efficiency, and provides theoretical possibility for improving the utilization rate of primary energy.
When the outlet temperature of the calcium carbide tail gas is 1500-1800 ℃, CO is used2When the coal gasification agent is used as a high-temperature gasification agent of coal, most of the coal consumed by the coal gasification calcium carbide production is used as fuel, and the proportion of the fuel actually used for the calcium carbide production is very low. The reason is that the gasified coal gas passes through the calcium carbide unit, CO in the high-temperature tail gas exists, and leaves the calcium carbide production system, and the energy of the coal is mainly discharged out of the calcium carbide production system in the forms of the sensible heat and the combustion heat of the calcium carbide tail gas. In order to ensure that the yield of the calcium carbide is increased only by increasing the gasification amount of the coal, the coal consumption is necessarily high. Therefore, how to improve the fuel utilization rate of the coal gasification calcium carbide production and reduce the fuel consumption becomes a technical problem to be solved urgently.
The invention discloses a production device for co-producing calcium carbide by lime and coke, which comprises a lime shaft kiln, a dividing wall rotary kiln and a calcium carbide refining furnace. The kiln body of the dividing wall rotary kiln consists of an inner ring and an outer ring which are coaxially arranged, the center of the inner ring is a kiln chamber, and the inner wall of the kiln chamber is coated with a self-fluxing refractory material layer. An annular material channel is arranged between the inner ring and the outer ring, and the annular material channel is provided with a supporting refractory material. However, the patent does not fully utilize the flue gas in the calcium carbide production process to preheat the raw materials, and has a large space for saving energy and reducing consumption.
Disclosure of Invention
The invention aims to provide a production device for calcium carbide co-production lime, which utilizes flue gas generated in the calcium carbide production process to heat and calcine limestone and take the limestone as a gasifying agent to gasify the limestone, utilizes coal gas and calcium carbide tail gas as fuel to burn and heat to produce calcium carbide, fully utilizes heat and combustible gas generated in the calcium carbide production process to co-produce, reduces the energy consumption of calcium carbide production and reduces the production cost.
The embodiment of the application provides a production device of carbide coproduction lime, and the device is including fixed carbide stove, vertical fixed gasifier, dividing wall lime rotary kiln, membrane separation nitrogen generator, buggy preheater, coal gas regenerator, air regenerator, the former feed bin of carbide, buggy distributing device and carbide distributing device. The fixed calcium carbide furnace is provided with a combustion chamber, a hearth, a calcium carbide collecting chamber, a tail gas chamber and a flue gas port, the combustion chamber is provided with a gas burner, and a tungsten pipe is arranged in the hearth. The calcium carbide raw material bin is connected to the inlet of the tungsten pipe through a calcium carbide distributor, the upper part of the tungsten pipe is communicated with the tail gas chamber, and the lower part of the tungsten pipe is communicated with the calcium carbide collecting chamber. The vertical fixed gasification furnace is provided with a gas chamber, a hearth and a slag collecting chamber, and the hearth is provided with a tungsten pipe and a flue gas outlet. The pulverized coal preheater is connected to a tungsten pipe through a pulverized coal distributor, the upper part of the tungsten pipe is communicated with the coal gas chamber, and the lower part of the tungsten pipe is connected with the slag collection chamber. The dividing wall lime rotary kiln is provided with a kiln chamber and a lime calcining space, the kiln chamber is provided with a preheated gas inlet and a preheated gas outlet, and the lime calcining space is provided with a limestone feeding-flue gas outlet and a lime outlet. The fixed calcium carbide furnace and the vertical fixed gasification furnace are connected into a whole through the transition section. The outlet of the gas chamber of the vertical fixed gasification furnace and the outlet of the tail gas chamber of the fixed calcium carbide furnace are connected to the inlet of the preheated gas of the dividing wall lime rotary kiln together, and the outlet of the preheated gas is connected to the gas burner of the combustion chamber through a pulverized coal preheater, a No. 2 dust remover, a No. 2 induced draft fan and a gas regenerator. The flue gas outlet of the vertical fixed gasification furnace is divided into two paths, the two paths are respectively connected to the inlet of a No. 1 dust remover through a coal gas regenerative furnace and an air regenerative furnace, the outlet of the No. 1 dust remover is divided into two paths through a No. 1 draught fan and a membrane separation nitrogen making machine, the two paths are connected to a pulverized coal distributor, and the other path is connected to a waste gas discharge system. A limestone feeding-flue gas outlet of the dividing wall lime rotary kiln is connected with a limestone preheater, and a gas outlet of the limestone preheater is connected to an inlet of a No. 1 dust remover.
Specifically, the device is equipped with air purifier and air-blower, and air purifier is equipped with wind inlet, and the air purifier export is connected to the combustion air entry of gas nozzle through air-blower and air regenerator.
Specifically, the gas regenerator and the air regenerator are respectively provided with two preheaters, and the two preheaters alternately perform heat storage and preheating. For a gas regenerative furnace or an air regenerative furnace, when one preheater absorbs heat to raise the temperature, the other preheater releases heat to lower the temperature, and after the respective heat absorption temperature rise or heat release temperature reduction work is completed, the two preheaters synchronously update the respective working states, namely the original heat absorption temperature rise preheater is changed into a heat release temperature reduction working state, and the original heat release temperature reduction preheater is changed into a heat absorption temperature rise working state. The continuous operation of the system is realized by alternately absorbing and releasing heat.
Specifically, the hearth of the vertical fixed gasification furnace is divided into a low-temperature gasification section, a medium-temperature gasification section and a high-temperature gasification section from top to bottom, channels of the low-temperature gasification section, the medium-temperature gasification section and the high-temperature gasification section are turned back and connected, an inlet of the high-temperature gasification section is connected with a flue gas port of the fixed calcium carbide furnace, and an outlet of the low-temperature gasification section is a flue gas outlet. The tungsten tube in the vertical fixed gasification furnace is provided with a middle tube, and the middle tube is connected with a pulverized coal distributor.
Specifically, the dividing wall lime rotary kiln is a concentric cylinder structure consisting of an outer cylinder, an inner cylinder and refractory supports, and the center of the inner cylinder is a kiln chamber. The space between the inner cylinder and the outer cylinder is divided into lime calcining spaces by refractory material support. The inside parcel of urceolus has the heat preservation, and the outside of heat preservation is the tube-shape steel construction. The inner cylinder can transfer the heat of the kiln chamber to the space for calcining lime. The inner cylinder and the outer cylinder are made of refractory materials or metals.
Specifically, the device is provided with a slag cooler and a calcium carbide cooler, the calcium carbide collecting chamber is connected to a calcium carbide outlet, and the calcium carbide outlet is connected to the calcium carbide cooler. The slag collection chamber is provided with a slag outlet which is connected to a slag cooler. Allowing CO to exit the limestone preheater2The gas directly enters the pulverized coal distributor after dust removal. The external heat source above 1800 ℃ is allowed to be supplemented at the inlet section of the vertical fixed gasification furnace to meet the requirements and changes of the subsequent process.
Specifically, the preparation method of the tungsten tube comprises the following steps: the graphite layer is printed with metal tungsten on two sides, or prepared from pure metal tungsten. The diameter of the tungsten tube includes, but is not limited to, 80-150mm, and the length of the tube includes, but is not limited to, 300-800 mm.
The lower part of the tungsten tube in the vertical fixed gasification furnace is a molten pool, the height of the molten pool is the height including but not limited to the height 1/3 of the tungsten tube, and the molten pool is formed by melting gasified ash. The upper portion of the tungsten tube is a solid feedstock layer that is a height that includes, but is not limited to, tungsten tube height 2/3. Allowing the entire filling of the tungsten tube with the layer of solid feedstock or the entire filling of the tungsten tube with the molten bath. The fluxing agent such as potassium oxide, sodium oxide, calcium oxide and the like is added into the raw materials to reduce the ash melting point of the ash. The vertical fixed gasification furnace is allowed to be replaced by any other type of equipment capable of realizing molten pool heating for coal gasification.
The feeding mode of the coal gasification production system is multi-frequency and low-feeding. The coal entering the coal gasification production system needs to be dried and dehydrated in advance. The coal can be dried and dehydrated by utilizing various residual heat of the coal gasification production system according to the requirement.
The tungsten tube may be replaced with materials including, but not limited to, tungsten iron, other high temperature metallic materials, or alloys. High temperature materials including but not limited to graphitized carbon as a substrate, and high temperature metal materials or alloys such as tungsten, rhenium, etc. can be plated or sprayed on the surface layer of the graphitized carbon or 3D printed. The tungsten tube may be replaced with a material other than tungsten. Materials of different materials can be used and a proper process is adopted to combine the materials into a whole in a layered mode to replace a tungsten tube, so that the service life, the heat conductivity and other characteristics of the combined material are better.
The dividing lime rotary kiln may be replaced with other equipment including, but not limited to, a coal gasifier, an electric furnace, a rotary kiln, or a shaft kiln.
The production device for calcium carbide and lime co-production adopts a molten pool for heating, and has high heat transfer efficiency and high production rate. Because the production temperatures of the three calcium carbide products with different gas evolution quantities are different, the chemical heat in different temperature intervals is utilized to ensure that the precious heat is left in the fixed calcium carbide furnace to produce the three calcium carbide products with different qualities. The feeding mode is multi-frequency less feeding, so that the calcium carbide raw material reaction layer is basically stable. The feeding position of the tungsten tube can be positioned above the molten pool or in the molten pool, or the tungsten tube can be simultaneously fed into the molten pool and the molten pool. Other new fuel gas is circulated back to the gas burner together to carry out high temperature heating to furnace through the form that will contain carbon monoxide chemical energy, has not only satisfied the requirement of fixed carbide stove to CO concentration in the gas, has realized the effective utilization to fixed carbide stove carbon dioxide tail gas high temperature waste heat simultaneously.
The knife edge of the dividing wall lime rotary kiln is sealed, and the cooling of lime products is carried out by adopting pure carbon dioxide.
Can set up spacingly in tungsten pipe lower part, make the carbide collect the room and separate with the tungsten pipe, empty all to the carbide collects the room with the intraductal carbide of tungsten through limit controller to add the carbide raw materials again and calcine. The calcium carbide collecting chamber can be divided into three collecting chambers including but not limited to three collecting chambers, and calcium carbide products with different gas forming amounts corresponding to the tungsten pipe are collected at the same time. And the tungsten pipes in the calcium carbide zone are allowed to produce calcium carbide products with the same gas production amount at the same time, namely the tungsten pipes in the calcium carbide zone are allowed to produce calcium carbide products with the same quality at the same time.
The present application further provides a coal gasification production system, comprising: the vertical fixed gasification furnace, the pulverized coal bunker, the slag cooler, the pulverized coal distributor, the CO heat exchanger, the draught fan No. 1, the dust remover No. 1, the first regenerative furnace, the second regenerative furnace, the dust remover No. 2, the draught fan No. 2 and the air blower. The vertical fixed gasification furnace is provided with a combustion chamber, a gas chamber, a hearth and a slag collecting chamber, wherein the hearth is provided with a tungsten pipe and a flue gas outlet. The combustion chamber is provided with a gas burner. The slag collection chamber is provided with a slag outlet which is connected to a slag cooler. The coal powder bin is connected to the tungsten tube through a coal powder distributor. The upper part of the tungsten tube is communicated with the gas chamber, and the lower part of the tungsten tube is connected with the slag collecting chamber. External supply of CO2Connected with a coal powder distributor and used as conveying gas and gasifying agent of coal powder. Gas discharged from the gas chamber and externally supplied CO2And the two parts are connected with a No. 1 dust remover and a No. 1 induced draft fan in sequence through the tube pass of the CO heat exchanger. The outlet of the No. 1 induced draft fan is divided into two paths, one path is directly connected with the product outlet of the coal gasification production system, and the other path is connected with the heat release inlet of the first regenerative furnace. The flue gas outlet is connected with the heat absorption inlets of the first regenerative furnace and the second regenerative furnace, and the heat absorption outlets of the first regenerative furnace and the second regenerative furnace are discharged outside after passing through a No. 2 dust remover and a No. 2 induced draft fan. And the heat release outlet of the first heat storage furnace is connected with a gas burner. The air is connected with the heat release inlet of the second regenerative furnace through a blower, and the second regenerative furnaceThe heat release outlet is also connected with the gas burner. The first regenerative furnace and the second regenerative furnace are both provided with two preheaters, and the heating process and the cooling process can be alternately carried out to ensure the continuous operation of the system. Each dust remover in the coal gasification production system has the function of removing substances such as steam, hydrogen, sulfide and the like on the basis of the dust removing function, thereby protecting the tungsten tube and prolonging the service life of the tungsten tube.
The production device for calcium carbide and lime co-production utilizes residual heat of flue gas generated in the calcium carbide production process to gasify, then the partition wall heats and calcines limestone to produce lime, and the residual heat value is converted into high-quality fuel gas. The coal gasification gas and the calcium carbide tail gas are used as fuels to burn and heat to produce the calcium carbide, and lime is co-produced, so that heat and gas are recycled, heat and combustible gas generated in the calcium carbide production process are fully utilized, the energy consumption of the calcium carbide production is reduced, and the production cost is reduced. The invention optimizes the structures of the calcium carbide furnace and the gasification furnace, and forms the production device for calcium carbide co-production lime together with main equipment such as a dividing wall lime rotary kiln and the like, and the production device has the advantages of short flow, simple structure, less equipment investment and contribution to popularization and utilization. The fixed calcium carbide furnace in the embodiment of the application adopts a molten pool heating mode to calcine the calcium carbide raw material, thereby being beneficial to heat transfer and accelerating the reaction speed.
Drawings
Fig. 1 is a schematic structural diagram of a calcium carbide co-production lime production apparatus provided in embodiment 1 of the present application;
FIG. 2 is a schematic structural view of a vertical fixed gasifier;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic structural view of a coal gasification production system according to example 2 of the present application;
wherein: no. 1-1 induced draft fan, No. 2-1 dust remover, 3-pulverized coal preheater, 3 '-pulverized coal bin, 4-limestone preheater, 5-CO heat exchanger, 7-limestone feeding-flue gas outlet, 8-slag outlet, 11-gas burner, 12-first regenerative furnace, 12' -second regenerative furnace, 13-combustion chamber, 14-calcium carbide outlet, 15-calcium carbide collecting chamber, 16-membrane separation nitrogen making machine, 18-calcium carbide raw material bin, 19-calcium carbide distributor, 20-tail gas chamber, 21-2 dust remover, No. 22-2 induced draft fan, 23-fixed calcium carbide furnace, 24-combustion chamber, 25-flue gas outlet, 27-gas regenerative furnace, 30-tungsten pipe, 33-air regenerative furnace, 34-air purifier, 35-preheater, 37-inner cylinder, 38-outer cylinder, 39-refractory material support, 40-kiln chamber, 41-blower, 66-vertical fixed gasifier, 67-gas chamber, 68-a slag collecting chamber, 69-a calcium carbide cooler, 70-carbon-containing slag, 71-a dividing wall lime rotary kiln, 72-a lime calcining space, 74-a transition section, 76-a middle pipe, 77-a low-temperature gasification section, 78-a medium-temperature gasification section, 79-a high-temperature gasification section, 80-a coal powder distributor and 81-a slag cooler.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
Example 1
The calcium carbide co-production lime production device provided by embodiment 1 of the invention is shown in fig. 1, and comprises a fixed calcium carbide furnace 23, a coal powder preheater 3, a limestone preheater 4, a No. 1 draught fan 1, a No. 1 dust remover 2, a No. 2 draught fan 22, a No. 2 dust remover 21, a slag cooler 81, a calcium carbide raw material bin 18, a calcium carbide distributor 19, a vertical fixed gasification furnace 66, a dividing wall lime rotary kiln 71, a coal gas heat storage furnace 27, an air heat storage furnace 33, a calcium carbide cooler 69, an air purifier 34, an air blower 41 and a coal powder distributor 80. The fixed calcium carbide furnace 23 is provided with a combustion chamber 13, a hearth 24, a calcium carbide collecting chamber 15, a tail gas chamber 20 and a flue gas port, and the combustion chamber is provided with a gas burner 11. The calcium carbide collecting chamber 15 is connected with a calcium carbide outlet 14, the calcium carbide outlet is connected to a calcium carbide cooler, and a tungsten pipe 30 is arranged in the hearth 24. Calcium carbide raw material bin 18 is connected to the tungsten pipe entry through calcium carbide distributing device 19, and tungsten pipe upper portion and tail gas chamber 20 intercommunication, the lower part and calcium carbide collection chamber 15 intercommunication, calcium carbide collection chamber 15 are connected to calcium carbide export 14, and the calcium carbide export is connected to calcium carbide cooler 69. The vertical fixed gasification furnace 66 is provided with a gas chamber 67, a hearth and a slag collection chamber 68, the hearth is provided with a tungsten tube 30 and a flue gas outlet 25, the slag collection chamber 68 is provided with a slag outlet 8, and the slag outlet 8 is connected to a slag cooler 81. As shown in fig. 2, the furnace chamber of the vertical fixed gasification furnace 66 is divided into a low-temperature gasification section 77, a medium-temperature gasification section 78 and a high-temperature gasification section 79 from top to bottom, the channels of the low-temperature gasification section 77, the medium-temperature gasification section 78 and the high-temperature gasification section 79 are turned back and connected, the inlet 79 of the high-temperature gasification section is connected with the flue gas port of the fixed calcium carbide furnace 23, and the outlet of the low-temperature gasification section 79 is the flue gas outlet 25. An intermediate tube 76 is provided in the tungsten tube 30. The coal hopper is connected to the coal powder preheater 3, the coal powder preheater 3 is connected to a middle pipe 76 in the tungsten pipe 30 through a coal powder distributor 80, the upper part of the tungsten pipe is communicated with the coal gas chamber 67, and the lower part of the tungsten pipe is connected with the slag collection chamber 68. The dividing wall lime rotary kiln 71 is provided with a kiln chamber 40 and a lime calcining space 72, and the kiln chamber 40 is provided with a preheating gas inlet and a preheating gas outlet. The space for lime calcination 72 is provided with a limestone feed-flue gas outlet 7 and a lime outlet. The fixed calcium carbide furnace 23 and the vertical fixed gasification furnace 66 are connected into a whole through a transition section 74. The outlet of the gas chamber 67 of the vertical fixed gasification furnace 66 and the outlet of the tail gas chamber 20 of the fixed calcium carbide furnace 23 are connected to the inlet of the preheated gas of the dividing wall lime rotary kiln 71. The preheated coal gas outlet is connected to the gas burner 11 of the combustion chamber 13 through a pulverized coal preheater 3, a No. 2 dust remover 21, a No. 2 induced draft fan 22 and a coal gas regenerative furnace 27. The flue gas outlet 25 of the vertical fixed gasification furnace 66 is divided into two paths, the two paths are respectively connected to the inlet of the No. 1 dust remover 2 through the gas heat storage furnace 27 and the air heat storage furnace 33, the outlet of the No. 1 dust remover 2 is divided into two paths through the No. 1 draught fan 1 and the membrane separation nitrogen making machine 16, one path is connected to the pulverized coal distributor 80, and the other path is connected to the waste gas discharge system. The limestone feeding-flue gas outlet 7 of the dividing wall lime rotary kiln 71 is connected with a limestone preheater 4, and the gas outlet of the limestone preheater 4 is connected to the inlet of the No. 1 dust remover 2. The air cleaner 34 is provided with an air inlet, and an outlet of the air cleaner 34 is connected to a combustion air inlet of the gas burner 11 through the blower 41 and the air regenerative furnace 33. As shown in fig. 3, the dividing wall lime rotary kiln 71 is provided with a calcined lime space 72 and a kiln chamber 40, the dividing wall lime rotary kiln 71 is a concentric cylinder structure composed of an outer cylinder 38, an inner cylinder 37 and a refractory support 39, and the center of the inner cylinder is the kiln chamber 40. The space between the inner cylinder and the outer cylinder is divided into a space 72 for calcining lime by being supported by refractory materials. The inside parcel of urceolus has the heat preservation, and the outside of heat preservation is the tube-shape steel construction. The inner cylinder can transfer a portion of the heat from the kiln chamber 40 to the space 72 for calcining lime. The structure of the inner and outer cylinders ensures that the gasification agent is in full contact with the coal in the space 72 for calcining lime. The inner cylinder and the outer cylinder are made of refractory materials or metals. The gas regenerator 27 and the air regenerator 33 are respectively provided with two preheaters 35 which alternately perform heat storage and preheating to ensure the continuous operation of the system. For each group of regenerative furnaces, when one preheater absorbs heat to raise the temperature, the other preheater releases heat to lower the temperature, and after the respective heat absorption temperature rise or heat release temperature reduction work is completed, the two preheaters synchronously update the respective working states, namely the original heat absorption temperature rise preheater is changed into a heat release temperature reduction working state, and the original heat release temperature reduction preheater is changed into a heat absorption temperature rise working state. The continuous operation of the system is realized by alternately absorbing and releasing heat.
The operation process of the embodiment is that coal in the coal hopper is sent into the pulverized coal preheater 3, and the pulverized coal of the pulverized coal preheater 3 is conveyed into the tungsten pipe 30 of the vertical fixed gasification furnace 66 by carbon dioxide gas through the pulverized coal distributor 80, and specifically enters into the molten pool through the middle pipe 76. Calcium carbide raw materials (uniformly mixed coal powder and lime powder) in the calcium carbide raw material bin 18 enter a tungsten pipe 30 of a fixed calcium carbide furnace 23 through a calcium carbide distributor 19. Coal gas and calcium carbide tail gas generated by the vertical fixed gasification furnace 66 enter the combustion chamber 13 through the fuel inlet. Specifically, calcium carbide tail gas discharged from the tail gas chamber 20 of the fixed calcium carbide furnace 23 is mixed with coal gas (the mixed gas contains 90% of CO) at the outlet of the coal gas chamber 67, the temperature of the mixed gas is 500 ℃ after the mixed gas is preheated by the coal gas heat storage furnace 27, and the mixed gas is connected to the gas burner 11. The air is purified, dedusted and dehydrated by an air purifier, then preheated to 500 ℃ in an air regenerative furnace 33, and is also connected to a gas burner 11 for combustion-supporting combustion of combustion-supporting gas to generate high-temperature flue gas of 2500 ℃. The high-temperature flue gas is in 24 muffle heating tungsten tubes in the hearth, and the temperature of the flue gas is reduced to 1800 ℃ after the high-temperature flue gas is heated by the calcium carbide tungsten tubes. The calcium carbide raw materials in the tungsten pipe 30 can become liquid calcium carbide at high temperature, powdery calcium carbide raw materials are put into the tungsten pipe 30 through the calcium carbide distributing device 19 at regular time and quantity, and 40g of powdery calcium carbide raw materials are put into each tungsten pipe 30 through the calcium carbide distributing device 19 every 5 seconds. The feed position of tungsten tube 30 may be above or within the bath or both. Inside the tungsten tube 30The liquid calcium carbide is gathered in the calcium carbide collecting chamber 15, and the liquid calcium carbide collected in the calcium carbide collecting chamber 15 is periodically discharged by monitoring the liquid level of the liquid calcium carbide in the tungsten pipe 30, so that the liquid level of the liquid calcium carbide in the tungsten pipe 30 is maintained at a preset height. The liquid calcium carbide in the calcium carbide collecting chamber 15 is discharged to the calcium carbide cooler 69 through the calcium carbide outlet 14 at regular time. The 1800 ℃ flue gas from the hearth of the fixed calcium carbide furnace 23 enters the high-temperature gasification section 79 of the vertical fixed gasification furnace 66 through the inlet of the high-temperature gasification section, the temperature of the flue gas is reduced to 1400 ℃ through the high-temperature gasification section, the flue gas turns back to enter the medium-temperature gasification section 78, the temperature of the flue gas is reduced to 1000 ℃ through the medium-temperature gasification section, the flue gas turns back to enter the low-temperature gasification section 77, and the temperature of the flue gas is reduced to 800 ℃ through the low-temperature gasification section. The external heat source above 1800 ℃ is allowed to be supplemented in the inlet section of the vertical fixed gasification furnace 66 to meet the requirements and changes of the subsequent process. The gasified slag falls into the slag collection chamber 68, and the slag in the slag collection chamber 68 enters the slag cooler 81 through the slag outlet 8. The pulverized coal in the pulverized coal distributor 80 passes through CO2Transport (of the CO)2At the same time as gasification agent for coal gasification, the CO2Separated by the membrane separation nitrogen making machine 16) into the tungsten tube of the vertical fixed gasification furnace 66, specifically into the molten bath in the gasification tungsten tube 30 through the intermediate tube 76. Allowing CO to exit from limestone preheater 42The gas enters the pulverized coal distributor 80 directly after dust removal. The lower part of the gasification tungsten pipe 30 is a molten pool (the height of the molten pool accounts for 1/3 of the height of the tungsten pipe) which is formed by melting gasification ash; the upper part of the tungsten tube 30 is a solid material layer (2/3, the height of the solid material layer is higher than the height of the tungsten tube). Fluxing agents such as potassium oxide, sodium oxide, calcium oxide and the like can be added into the raw materials to reduce the ash melting point of the ash. It is allowed to fill the entire solid raw material layer in the gasified tungsten tube 30 or to fill the entire molten pool in the gasified tungsten tube 30. The raw material coal powder is gasified into coal gas in the tungsten tube, the coal gas is collected in a coal gas chamber 67 at the upper part of the tungsten tube through a solid layer, and carbon-containing slag 70 falls into a slag collecting chamber 68. For adjusting the height of the solid layer, CO which does not carry coal dust is allowed2And enters the molten pool separately. Calcium carbide tail gas in the tail gas chamber 20 and coal gas in the coal gas chamber 67 enter the kiln chamber of the dividing wall lime rotary kiln 71 through the high-temperature flue gas inlet together, and the dividing wall heats limestone materials in the lime calcining space 72. The flue gas is divided into two paths through the flue gas outlet 25, one part of the flue gas enters the gas heat storage furnace 27 to preheat gas, the other part of the flue gas enters the air heat storage furnace to preheat air, and the temperature of the flue gas after preheating the gas and the air is reduced to 100 ℃. Calcined lime decomposition gas (100% CO at 100 ℃) from the calcined lime space 722) After the limestone raw materials are preheated by the limestone preheater 4, the limestone raw materials and flue gas after preheating coal gas and air are dedusted by the No. 1 deduster 2, nitrogen is separated from the membrane separation nitrogen making machine 16 by the No. 1 draught fan 1, the separated flue gas is divided into two paths, one path is directly discharged to a waste gas discharge system, and the other path is used as conveying gas of coal powder by the coal powder distributor 80. Limestone adopts 1-5 mm powder.
Example 2
Example 2 of the present application provides a coal gasification production system, as shown in fig. 4, including: the device comprises a vertical fixed gasification furnace 66, a pulverized coal bunker 3 ', a slag cooler 81, a pulverized coal distributor 80, a CO heat exchanger 5, a No. 1 induced draft fan 1, a No. 1 dust remover 2, a first regenerative furnace 12, a second regenerative furnace 12', a No. 2 dust remover 21, a No. 2 induced draft fan 22 and an air blower 41. The vertical fixed gasification furnace 66 is provided with a combustion chamber 13, a gas chamber 67, a hearth and a slag collection chamber 68. The hearth is provided with a tungsten tube 30 and a flue gas outlet 25. The combustion chamber 13 is provided with a gas burner 11. The slag collection chamber 68 is provided with a slag outlet 8, the slag outlet 8 being connected to a slag cooler 81. The coal dust bin 3' is connected to the tungsten tube 30 through a coal dust distributor 80. The upper part of the tungsten tube 30 is connected to a gas chamber 67, and the lower part thereof is connected to a slag collection chamber 68.
External supply of CO2Connected with a coal powder distributor 80 and used as conveying gas and gasifying agent of coal powder. Gas discharged from the gas chamber 67 and supplied with CO2And the two parts are connected with a No. 1 dust remover 2 and a No. 1 induced draft fan 1 in sequence through the tube pass of a CO heat exchanger 5. The outlet of the No. 1 induced draft fan is divided into two paths, one path is directly connected with the product outlet of the coal gasification production system, and the other path is connected with the heat release inlet of the first regenerative furnace 12. The flue gas outlet 25 is connected with the heat absorption inlets of the first regenerative furnace 12 and the second regenerative furnace 12 ', and the heat absorption outlets of the first regenerative furnace 12 and the second regenerative furnace 12' are discharged outside after passing through the No. 2 dust remover 21 and the No. 2 induced draft fan 22. The heat release outlet of the first regenerative furnace 12 is connected with the gas burner 11. Air passes through the blower 41 and the second regenerator 12The heat release inlet of the 'is connected, and the heat release outlet of the second regenerative furnace 12' is also connected with the gas burner 11.
The first regenerator 12 and the second regenerator 12' are each provided with two preheaters, and the heating process and the cooling process can be alternately performed to ensure continuous operation of the system. For each group of regenerative furnaces, when one preheater absorbs heat to raise the temperature, the other preheater releases heat to lower the temperature, and after the respective heat absorption temperature rise or heat release temperature reduction work is completed, the two preheaters synchronously update the respective working states, namely the original heat absorption temperature rise preheater is changed into a heat release temperature reduction working state, and the original heat release temperature reduction preheater is changed into a heat absorption temperature rise working state. The continuous operation of the system is realized by alternately absorbing and releasing heat. Each dust remover in the coal gasification production system has the function of removing substances such as steam, hydrogen, sulfide and the like on the basis of the dust removing function, thereby protecting the tungsten tube 30 and prolonging the service life of the tungsten tube 30.
Specifically, as shown in fig. 2, the furnace chamber of the vertical fixed gasification furnace 66 is divided into a low-temperature gasification stage 77, a medium-temperature gasification stage 78, and a high-temperature gasification stage 79 from top to bottom. The channels of the low-temperature gasification section 77, the medium-temperature gasification section 78 and the high-temperature gasification section 79 are connected back and forth. The combustion chamber 13 is arranged at the inlet of the high-temperature gasification section 79; the outlet of the low-temperature gasification section 77 is the flue gas outlet 25.
As shown in fig. 2, in the vertical fixed gasification furnace 66 of embodiment 2, a tungsten pipe 30 is provided with a middle pipe 76, and the middle pipe 76 is connected to a pulverized coal distributor 80 for injecting pulverized coal into the upper surface of the molten pool of the tungsten pipe 30, or injecting pulverized coal into the molten pool of the tungsten pipe 30, or simultaneously transporting pulverized coal to the upper surface of the molten pool of the tungsten pipe 30 and the molten pool.
In one embodiment, the method for manufacturing the tungsten tube 30 comprises: and metal tungsten is printed on two sides of the graphite layer. Or prepared by pure metal tungsten. The diameter of tungsten tube 30 includes, but is not limited to, 80-150mm, and the tube length is 300-800 mm.
In the vertical fixed gasification furnace 66, the lower part of the tungsten pipe 30 is a molten pool, the height of the molten pool is the height including but not limited to the height 1/3 of the tungsten pipe, and the molten pool is formed by melting gasification ash; the upper portion of tungsten tube 30 is a solid feedstock layer that is at a height that includes, but is not limited to, tungsten tube height 2/3. Allowing the tungsten tube 30 to be filled entirely with a layer of solid feedstock material or the tungsten tube 30 to be filled entirely with a molten bath.
In practical application, fluxing agents such as potassium oxide, sodium oxide, calcium oxide and the like are allowed to be added into the raw materials so as to reduce the ash melting point of ash.
The feeding mode of the coal gasification production system is multi-frequency and low-feeding. The coal entering the coal gasification production system needs to be dried and dehydrated in advance. The coal can be dried and dehydrated by utilizing various residual heat of the coal gasification production system according to the requirement.
The vertical fixed gasification furnace 66 is replaced by any other equipment capable of realizing molten pool heating for coal gasification, so that coal gasification is realized.
The coal gasification production system in embodiment 2 can supply coal gas to the fixed calcium carbide furnace 23 in embodiment 1 to calcine calcium carbide.
The working process of the coal gasification production system provided by the embodiment 2 of the application is as follows: after the air is heated to 500 ℃ by the second regenerator 12', the air is mixed with the CO + CO of 500 ℃ from the first regenerator 122The mixed gas (the CO content is 30 percent) enters the gas burner 11 of the vertical fixed gasification furnace 66 together for combustion, and high-temperature flue gas at 1800 ℃ is generated by combustion. The high-temperature flue gas passes through a high-temperature gasification section 79, a medium-temperature gasification section 78 and a low-temperature gasification section 77 of the vertical fixed gasification furnace 66 in sequence, and the partition wall heats the tungsten tube 30 and materials (mainly raw material coal and raw material CO) in the tungsten tube2Gas) to provide heat for the gasification reaction within the tungsten tube. The high-temperature flue gas firstly passes through the high-temperature gasification section 79 and then the temperature is reduced to 1400 ℃; then the temperature is reduced to 1000 ℃ after passing through a medium-temperature gasification section; most preferablyThen the temperature is finally reduced to 800 ℃ through a low-temperature gasification section. Flue gas (CO as main component) at 800 deg.C2) Is discharged from the vertical fixed gasification furnace 66 into the first and second regenerative furnaces 12 and 12 ', and provides heat to the first and second regenerative furnaces 12 and 12'. The first regenerator 12 and the second regenerator 12' are respectively provided with two preheaters, and a temperature rise process and a temperature reduction process can be alternately performed to ensure continuous operation of the system. The temperature of the flue gas discharged from the first regenerator 12 and the second regenerator 12' is reduced to 100 ℃. The flue gas with the temperature of 100 ℃ is discharged outside after passing through a No. 2 dust remover 21 and a No. 2 draught fan 22. External CO2As a raw material CO2The raw material coal powder in the coal powder bin 3' is quantitatively added into each tungsten pipe 30 of the vertical fixed gasification furnace 66 by gas conveying through a coal powder distributor 80 and an intermediate pipe 76, and the specific feeding position is positioned below a gasification ash slag molten pool formed at the lower part of the tungsten pipe 30. Coal dust and CO2The gas is heated and heated in each tungsten tube 30, and gasification reaction is carried out to generate 90% content CO gas, and the 90% content CO gas is discharged from an upper outlet of the tungsten tube 30 to a gas chamber 67 at the upper part of the vertical fixed gasification furnace 66; the gasification ash residue left after the coal powder gasification is melted at high temperature and forms a gasification ash residue molten pool in the tungsten pipe 30, and the height of the molten pool of the gasification ash residue is 1/3 of the height of the tungsten pipe. The slag in the gasified slag melting bath can be discharged in a slag tapping manner through a slag collecting chamber 68 at the bottom of the vertical fixed gasification furnace 66. 90% CO gas from the gas chamber 67 at 800 deg.C; it is first mixed with 100% CO supplied from outside2Mixing, reducing the temperature to 600 ℃, and simultaneously reducing the concentration of CO to 80% content to ensure the safety of the subsequent process. The 80% CO gas with the temperature of 600 ℃ is subjected to heat exchange by the CO heat exchanger 1, and the temperature of the gas is reduced to 100 ℃. High-pressure water can be input to a shell pass inlet of the CO heat exchanger 1 and is used for cooling 80 percent of CO gas at the temperature of 600 ℃; the shell side outlet of the CO heat exchanger 1 discharges the vapor. After 80% CO gas at 100 ℃ is subjected to dust removal purification by a No. 1 dust remover 2 and pressurization by a No. 1 draught fan 1, one part of the CO gas is used as a product for external supply; another part is connected with external CO2And (4) mixing. CO + CO at 100 ℃ after mixing2The mixed gas (with 30 percent of CO) passes through a first regenerative furnace 12 to be heated to 500 ℃, and then enters vertical fixed gasificationThe gas burner 11 of the furnace 66 is used as gas.
Each dust remover in the coal gasification production system has a function of removing substances such as steam, hydrogen, sulfides, and the like in addition to a dust removal function, thereby protecting the tungsten tube 30 and prolonging the service life of the tungsten tube 30.
Claims (8)
1. The utility model provides a production device of carbide coproduction lime, characterized by: the device comprises a fixed calcium carbide furnace (23), a vertical fixed gasification furnace (66), a dividing wall lime rotary kiln (71), a membrane separation nitrogen making machine (16), a coal powder preheater (3), a coal gas regenerative furnace (27), an air regenerative furnace (33), a calcium carbide raw material bin (18), a coal powder distributor (80) and a calcium carbide distributor (19); the fixed calcium carbide furnace (23) is provided with a combustion chamber (13), a hearth (24), a calcium carbide collecting chamber (15), a tail gas chamber (20) and a flue gas port, the combustion chamber is provided with a gas burner (11), and a tungsten pipe (30) is arranged in the hearth; the calcium carbide raw material bin (18) is connected to an inlet of a tungsten pipe through a calcium carbide distributor (19), the upper part of the tungsten pipe is communicated with a tail gas chamber (20), and the lower part of the tungsten pipe is communicated with a calcium carbide collecting chamber (15); the vertical fixed gasification furnace (66) is provided with a gas chamber (67), a hearth and a slag collecting chamber (68), and the hearth is provided with a tungsten pipe (30) and a flue gas outlet (25); the pulverized coal preheater (3) is connected to a tungsten pipe (30) through a pulverized coal distributor (80), the upper part of the tungsten pipe is communicated with a gas chamber (67), and the lower part of the tungsten pipe is connected with a slag collecting chamber (68); the dividing wall lime rotary kiln (71) is provided with a kiln chamber and a lime calcining space (72), the kiln chamber is provided with a preheated gas inlet and a preheated gas outlet, and the lime calcining space (72) is provided with a limestone feeding-flue gas outlet (7) and a lime outlet; the fixed calcium carbide furnace (23) and the vertical fixed gasification furnace (66) are connected into a whole through a transition section (74); an outlet of a gas chamber (67) of the vertical fixed gasification furnace (66) and an outlet of a tail gas chamber (20) of the fixed calcium carbide furnace (23) are connected to a preheated gas inlet of the dividing wall lime rotary kiln (71) together, and the preheated gas outlet is connected to a gas burner (11) of the combustion chamber (13) through a pulverized coal preheater (3), a No. 2 dust remover (21), a No. 2 induced draft fan (22) and a gas regenerator (27); the flue gas outlet (25) of the vertical fixed gasification furnace (66) is divided into two paths, the two paths are respectively connected to the inlet of the No. 1 dust remover (2) through a gas heat storage furnace (27) and an air heat storage furnace (33), the outlet of the No. 1 dust remover (2) is divided into two paths through a No. 1 induced draft fan (1) and a membrane separation nitrogen making machine (16), one path is connected to a pulverized coal distributor (80), and the other path is connected to a waste gas discharge system; the limestone feeding-flue gas outlet (7) of the dividing wall lime rotary kiln (71) is connected with a limestone preheater (4), and the gas outlet of the limestone preheater (4) is connected to the inlet of a No. 1 dust remover (2).
2. The calcium carbide co-production lime production apparatus as set forth in claim 1, wherein: the device is provided with an air purifier (34) and a blower (41), wherein the air purifier is provided with an air inlet, and an air purifier outlet is connected to a combustion air inlet of a gas burner (11) through the blower (41) and an air regenerative furnace (33).
3. The calcium carbide co-production lime production apparatus as set forth in claim 2, wherein: the coal gas heat accumulation furnace (27) and the air heat accumulation furnace (33) are respectively provided with two preheaters (35), and the two preheaters alternately perform heat accumulation and preheating; for the gas heat storage furnace (27) or the air heat storage furnace (33), when one preheater absorbs heat and heats, the other preheater releases heat and cools, and after respective heat absorption and temperature rise or heat release and temperature reduction work is finished, the two preheaters synchronously update respective working states, namely the original heat absorption and temperature rise preheater is changed into a heat release and temperature reduction working state, and the original heat release and temperature reduction preheater is changed into a heat absorption and temperature rise working state; the continuous operation of the system is realized by alternately absorbing and releasing heat.
4. The calcium carbide co-production lime production apparatus as set forth in claim 3, wherein: the hearth of the vertical fixed gasification furnace (66) is divided into a low-temperature gasification section (77), a medium-temperature gasification section (78) and a high-temperature gasification section (79) from top to bottom, channels of the low-temperature gasification section, the medium-temperature gasification section and the high-temperature gasification section are connected in a back-turning mode, an inlet (79) of the high-temperature gasification section is connected with a flue gas port of the fixed calcium carbide furnace (23), and an outlet of the low-temperature gasification section (77) is a flue gas outlet (25); a middle pipe (76) is arranged in a tungsten pipe (30) in the vertical fixed gasification furnace (66), and the middle pipe (76) is connected with a pulverized coal distributor (80).
5. The calcium carbide co-production lime production apparatus as set forth in claim 4, wherein: the dividing wall lime rotary kiln (71) is a concentric cylinder structure consisting of an outer cylinder (38), an inner cylinder (37) and a refractory material support (39), and the center of the inner cylinder is a kiln chamber (40); the space between the inner cylinder and the outer cylinder is divided into a space (72) for calcining lime by a refractory material support; the heat-insulating layer is wrapped inside the outer barrel, and a cylindrical steel structure is arranged outside the heat-insulating layer; the inner cylinder can transfer the heat of the kiln chamber (40) to the space (72) for calcining lime; the inner cylinder and the outer cylinder are made of refractory materials or metals.
6. The calcium carbide co-production lime production device as claimed in claim 5, wherein: the device is provided with a slag cooler (81) and a calcium carbide cooler (69), the calcium carbide collecting chamber (15) is connected to a calcium carbide outlet (14), and the calcium carbide outlet is connected to the calcium carbide cooler (69); the slag collection chamber (68) is provided with a slag outlet (8), and the slag outlet (8) is connected to a slag cooler (81);
allowing CO to exit the limestone preheater (4)2The gas directly enters a pulverized coal distributor (80) after being dedusted; the external heat source above 1800 ℃ is allowed to be supplemented in the inlet section of the vertical fixed gasification furnace (66) to meet the requirements and changes of the subsequent process.
7. The calcium carbide co-production lime production apparatus as set forth in claim 6, wherein: the preparation method of the tungsten tube (30) comprises the following steps: the method has the advantages that metal tungsten is printed on two sides of the graphite layer, or pure metal tungsten is adopted for preparation; the diameter of the tungsten tube (30) comprises, but is not limited to, 80-150mm, and the tube length comprises, but is not limited to, 300-800 mm;
the lower part of a tungsten pipe (30) in the vertical fixed gasification furnace (66) is a molten pool, the height of the molten pool is the height including but not limited to the height 1/3 of the tungsten pipe, and the molten pool is formed by melting gasified ash; the upper part of the tungsten tube (30) is provided with a solid raw material layer, and the height of the solid raw material layer is the height including but not limited to the height 2/3 of the tungsten tube; allowing the tungsten tube (30) to be filled entirely with a layer of solid feedstock material, or the tungsten tube (30) to be filled entirely with a molten bath; adding fluxing agents such as potassium oxide, sodium oxide, calcium oxide and the like into the raw materials to reduce the ash melting point of ash;
the vertical fixed gasification furnace (66) is replaced by any other equipment which can realize molten pool heating for coal gasification;
the feeding mode of the coal gasification production system is multi-frequency low-feeding; the coal entering the coal gasification production system needs to be dried and dehydrated in advance; various waste heat of the coal gasification production system can be utilized to carry out drying and dehydration treatment on coal according to requirements;
the tungsten tube (30) may be replaced with materials including, but not limited to, tungsten iron, other high temperature metallic materials or alloys; high-temperature metal materials or alloys such as tungsten, rhenium and the like can also be plated or sprayed or 3D printed on the surface layer of the graphitized carbon by using high-temperature materials including but not limited to graphitized carbon as a substrate; the tungsten tube (30) can be replaced by other materials except tungsten; materials of different materials can be used, and a proper process is adopted to combine layers into a whole to replace the tungsten tube (30), so that the service life, the heat conductivity and other characteristics of the combined material are better;
the dividing lime rotary kiln (71) can be replaced by other equipment including but not limited to a coal gasifier, an electric furnace, a rotary kiln or a shaft kiln;
the production device for calcium carbide and lime co-production adopts a molten pool for heating, so that the heat transfer efficiency is high, and the production speed is high; because the production temperatures of the three calcium carbide products with different gas evolution quantities are different, the chemical heat in different temperature intervals is utilized to ensure that the precious heat is left in the fixed calcium carbide furnace (23) to produce the three calcium carbide products with different qualities; the feeding mode is multi-frequency less feeding, so that the calcium carbide raw material reaction layer is basically stable; the feeding position of the tungsten tube (30) can be positioned above the molten pool or in the molten pool, or the tungsten tube can be simultaneously fed above the molten pool and in the molten pool; other new fuel gas in the form of chemical energy containing carbon monoxide is circulated back to the gas burner (11) to heat the hearth (24) at high temperature, so that the requirement of the fixed calcium carbide furnace on the concentration of CO in gas is met, and the effective utilization of the high-temperature waste heat of the carbon dioxide tail gas of the fixed calcium carbide furnace (23) is realized;
the knife edge of the dividing wall lime rotary kiln (71) is sealed, and the cooling of lime products is carried out by adopting pure carbon dioxide;
limiting can be arranged at the lower part of the tungsten tube, so that the calcium carbide collecting chamber (15) is separated from the tungsten tube, and the calcium carbide in the tungsten tube is completely emptied into the calcium carbide collecting chamber (15) through the limiting controller, so that the calcium carbide raw material is added again for calcination;
the calcium carbide collecting chamber (15) can be divided into three collecting chambers, and calcium carbide products with different gas forming amounts corresponding to the tungsten pipe are collected at the same time; and the tungsten pipes (30) in the calcium carbide zone are allowed to simultaneously produce calcium carbide products with the same gas evolution quantity, namely the tungsten pipes (30) in the calcium carbide zone are allowed to simultaneously produce calcium carbide products with the same quality.
8. A coal gasification production system, comprising: the system comprises a vertical fixed gasification furnace (66), a pulverized coal bin (3 '), a slag cooler (81), a pulverized coal distributor (80), a CO heat exchanger (5), a No. 1 induced draft fan (1), a No. 1 dust remover (2), a first regenerative furnace (12), a second regenerative furnace (12'), a No. 2 dust remover (21), a No. 2 induced draft fan (22) and an air blower (41);
the vertical fixed gasification furnace (66) is provided with a combustion chamber (13), a gas chamber (67), a hearth and a slag collection chamber (68), and the hearth is provided with a tungsten pipe (30) and a flue gas outlet (25); the combustion chamber (13) is provided with a gas burner (11); the slag collection chamber (68) is provided with a slag outlet (8), and the slag outlet (8) is connected to a slag cooler (81);
the coal powder bin (3') is connected to a tungsten tube (30) through a coal powder distributor (80); the upper part of the tungsten pipe (30) is communicated with a gas chamber (67), and the lower part of the tungsten pipe is connected with a slag collecting chamber (68);
external supply of CO2Is connected with the pulverized coal distributor (80) and is used as conveying gas and gasifying agent of pulverized coal;
the gas discharged from the gas chamber (67) and the CO supplied from the outside2The air passes through a tube pass of a CO heat exchanger (5) and is sequentially connected with a No. 1 dust remover (2) and a No. 1 induced draft fan (1); the outlet of the No. 1 induced draft fan (1) is divided into two paths, one path is directly connected with the product outlet of the coal gasification production system, and the other path is connected with the heat release inlet of the first regenerative furnace (12);
the flue gas outlet (25) is connected with heat absorption inlets of the first heat storage furnace (12) and the second heat storage furnace (12 '), and heat absorption outlets of the first heat storage furnace (12) and the second heat storage furnace (12') are discharged outside after passing through a No. 2 dust remover (21) and a No. 2 induced draft fan (22);
the heat release outlet of the first heat storage furnace (12) is connected with the gas burner (11); the air is connected with a heat release inlet of a second regenerative furnace (12 ') through the blower (41), and a heat release outlet of the second regenerative furnace (12') is also connected with the gas burner (11);
the first regenerative furnace (12) and the second regenerative furnace (12') are respectively provided with two preheaters, and the heating process and the cooling process can be alternately carried out so as to ensure the continuous operation of the system; each dust remover in the coal gasification production system has the function of removing substances such as steam, hydrogen, sulfide and the like on the basis of the dust removing function, thereby protecting the tungsten tube (30) and prolonging the service life of the tungsten tube (30).
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