Preparation method of desulfurized coal briquette and equipment for preparing desulfurized coal briquette

Abstract

The invention provides a preparation method of desulfurized coal briquettes and equipment for preparing the desulfurized coal briquettes, and relates to a gas producer. The preparation method of the desulfurized coal briquette comprises the following steps: weighing crushed coal, furnace slag, a sulfur-fixing agent and tar according to a preset proportion; the preparation method comprises the following steps: pre-stirring crushed coal, slag and a sulfur-fixing agent, adding tar after uniformly stirring, and stirring again until uniformly stirring; pressing the uniformly mixed mixture into a blocky semi-finished product through an extrusion molding machine; and introducing mixed gas of low-temperature flue gas and air into the hot air drying furnace, and maintaining for a preset time to obtain qualified finished desulfurized coal briquettes. According to the invention, the crushed coal, the slag, the sulfur-fixing agent and the tar generated by the gas producer are stirred, pressed and dried to prepare the desulfurized coal briquette, so that various by-products generated by the gas producer can be recycled, and the treatment cost and complexity are reduced.

Description

Technical Field

[0001] This application relates to the field of gas producers, and more particularly, to a method for preparing desulfurized coal briquettes and an apparatus for preparing desulfurized coal briquettes. Background Art

[0002] The two-stage gas producer is a device widely used in industrial production, mainly used for converting coal into gas for subsequent energy utilization. During the gasification process, coal undergoes high-temperature reactions, generating gas as well as various by-products. These by-products include slag, by-product tar, and screened fine coal. Slag is a solid waste generated during the gasification process, with its main components being inorganic minerals, and is usually used in the building materials field, such as fine aggregate for road construction, raw materials for cement plants, or fine aggregate for brick making. Tar is a liquid by-product generated during the gasification process, containing various organic compounds, and is usually recycled by professional recycling manufacturers and further refined into fuel oil or other chemical products. Fine coal is the fine particles generated during the screening of coal. Since its shape and particle size cannot directly enter the gasifier as raw materials, it is usually collected as boiler fuel or re-enters the gasifier after being pressed into coal balls. Although these by-products have certain utilization methods in the prior art, their treatment processes usually need to be carried out separately, increasing the treatment cost and complexity. Summary of the Invention

[0003] The purpose of this application is to provide a method for preparing desulfurized coal briquettes and an apparatus for preparing desulfurized coal briquettes, which can recycle various by-products generated by the gas producer, reducing the treatment cost and complexity.

[0004] In a first aspect, the present invention provides a method for preparing desulfurized coal briquettes, and the method for preparing desulfurized coal briquettes includes:

[0005] Weigh fine coal, slag, sulfur-fixing agent, and tar in a preset ratio;

[0006] Pre-stir the fine coal, slag, and sulfur-fixing agent, and after stirring evenly, add tar and stir again until evenly mixed;

[0007] Press the evenly mixed mixture into a semi-finished product in a block shape through an extrusion molding machine;

[0008] Pass a mixed gas of low-temperature flue gas and air into a hot air drying furnace, and after curing for a preset time, obtain qualified finished desulfurized coal briquettes.

[0009] In an alternative embodiment, the preset ratio of fine coal, slag, sulfur-fixing agent, and tar is 65:17:8:10.

[0010] In an alternative embodiment, the diameter of the semi-finished product is 40 mm to 60 mm.

[0011] In a second aspect, the present invention provides an apparatus for preparing desulfurized coal briquettes, which is used to implement the method for preparing desulfurized coal briquettes described in the foregoing embodiments. The apparatus for preparing desulfurized coal briquettes includes a weighing feeder, a metering pump, a mixing bin, an extrusion molding machine, and a hot air drying furnace. The discharge port of the weighing feeder is communicated with the first feed port of the mixing bin, the discharge port of the metering pump is communicated with the first feed port of the mixing bin, the feed port of the extrusion molding machine is communicated with the discharge port of the mixing bin, and the feed port of the hot air drying furnace is communicated with the discharge port of the extrusion molding machine.

[0012] In an optional embodiment, a first conveyor belt is provided between the mixing bin and the extrusion molding machine. One end of the first conveyor belt is located at the discharge port of the mixing bin, and the other end of the first conveyor belt is located at the extrusion molding machine.

[0013] In an optional embodiment, a second conveyor belt is provided between the extrusion molding machine and the hot air drying furnace. One end of the second conveyor belt is located at the discharge port of the extrusion molding machine, and the other end of the second conveyor belt is located at the feed port of the hot air drying furnace.

[0014] In an optional embodiment, the discharge port of the extrusion molding machine is arranged at the lower part of the extrusion molding machine, the feed port of the hot air drying furnace is located at the upper part of the hot air drying furnace, and the second conveyor belt is arranged at an angle with the hot air drying furnace.

[0015] In an optional embodiment, the hot air drying furnace is provided with a first discharge port and a second discharge port. The first discharge port is used for discharging waste gas, and the second discharge port is used for outputting desulfurized coal briquettes.

[0016] In an optional embodiment, the apparatus for preparing desulfurized coal briquettes further includes a tar storage tank, and the discharge port of the tar storage tank is communicated with the feed port of the metering pump.

[0017] In an optional embodiment, the apparatus for preparing desulfurized coal briquettes further includes a tar heater and a flue gas hot water heat exchanger. The tar heater is arranged between the tar storage tank and the flue gas hot water heat exchanger. The flue gas hot water heat exchanger is provided with an air inlet and an air outlet. The air inlet is used for inputting waste flue gas from an internal combustion generator set, and the air outlet is communicated with the hot air drying furnace.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] The present application uses the crushed coal, slag, sulfur fixing agent, and tar generated by the gas generator to prepare desulfurized coal briquettes through mixing, pressing, and drying, which can recycle various by-products generated by the gas generator and reduce the treatment cost and complexity. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 Shows a schematic connection diagram of each component of the equipment for preparing desulfurized coal blocks in some embodiments;

[0022] Figure 2 Shows a schematic connection diagram of the weighing feeder and the storage bin in some embodiments.

[0023] Main element symbol description:

[0024] 1 - weighing feeder; 110 - first weighing feeder; 120 - second weighing feeder; 130 - third weighing feeder; 2 - metering pump; 3 - flow meter; 4 - mixing bin; 5 - extrusion molding machine; 6 - hot air drying furnace; 7 - storage bin; 710 - first storage bin; 720 - second storage bin; 730 - third storage bin; 8 - tar storage tank; 9 - tar heater; 10 - flue gas - hot water heat exchanger; 11 - fan; 12 - temperature transmitter; 13 - flue gas dust collector; 14 - first conveyor belt; 15 - second conveyor belt. Specific embodiments

[0025] The following will describe in detail the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0028] In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0030] Embodiment

[0031] This embodiment is applicable to the preparation of desulfurized coal briquettes, and the main raw materials for preparing desulfurized coal briquettes are by-products generated by a gas generator: slag, tar, and crushed coal. Of course, some of the crushed coal has extremely small particles, similar to powder, and for the convenience of narration and understanding, they are uniformly referred to as crushed coal.

[0032] The above-mentioned slag and crushed coal are solid substances, and tar is a liquid substance.

[0033] Please refer to Figure 1 and Figure 2 , this embodiment provides a device for preparing desulfurized coal briquettes. The device for preparing desulfurized coal briquettes includes a weighing feeder 1, a metering pump 2, a mixing bin 4, an extrusion molding machine 5, and a hot air drying furnace 6.

[0034] The discharge port of the weighing feeder 1 is communicated with the first feed port of the mixing bin 4. Since the raw materials entering the mixing bin 4 are three different raw materials: slag, crushed coal, and a sulfur-fixing agent, therefore, in this embodiment, three weighing feeders 1 are correspondingly provided, and one weighing feeder 1 weighs a corresponding raw material respectively.

[0035] In this embodiment, the three weighing feeders 1 are respectively defined as the first weighing feeder 110, the second weighing feeder 120, and the third weighing feeder 130. Among them, the first weighing feeder 110 is used to weigh slag, the second weighing feeder 120 is used to weigh crushed coal, and the third weighing feeder 130 is used to weigh sulfur-fixing agent.

[0036] In this embodiment, a storage bin 7 can be respectively configured for the first weighing feeder 110, the second weighing feeder 120, and the third weighing feeder 130. The three storage bins 7 are respectively defined as the first storage bin 710, the second storage bin 720, and the third storage bin 730. The first storage bin 710 is used to store slag, the second storage bin 720 is used to store crushed coal, and the third storage bin 730 is used to store sulfur-fixing agent.

[0037] In this embodiment, through the cooperation of the storage bin 7 and the weighing feeder 1, after the weighing feeder 1 outputs the raw material, the storage bin 7 timely replenishes the weighing feeder 1, achieving the effect of replenishing as it is fed, and reducing the waiting time of working hours.

[0038] The discharge port of the metering pump 2 is communicated with the first feed port of the mixing bin 4. The metering pump 2 is used to pump out tar proportionally. In this embodiment, a flow meter 3 is also provided between the metering pump 2 and the mixing bin 4 to monitor the flow rate of tar.

[0039] In this embodiment, through the configuration of the weighing feeder 1, the metering pump 2, and the flow meter 3, the accuracy of the ratio is ensured, automated production is realized, and the labor cost is reduced.

[0040] In some other embodiments, the weighing feeder 1 can be replaced by a star feeder.

[0041] The mixing bin 4 is used to mix slag, crushed coal, sulfur-fixing agent, and tar, so as to produce a uniformly mixed mixture, and the mixture is a solid-liquid mixture.

[0042] Among them, the crushed coal of the desulfurized coal block is one of the main sources of the calorific value of the finished coal block, providing about 75 calorific value, and at the same time, the crushed coal is also the main aggregate.

[0043] The slag plays multiple roles in the raw materials. On the one hand, it is used as an aggregate. On the other hand, since the slag contains a part of fixed carbon, it can also provide some calorific value. At the same time, because the gas generator adopts wet slag removal, the slag contains more water, and the slag is also a source of water.

[0044] The role of the sulfur-fixing agent is similar to that of cement. It acts together with water as a binder to provide strength for the raw materials. At the same time, the sulfur-fixing agent is also a sulfur-fixing agent, making the finished coal block have a certain desulfurization effect.

[0045] Tar, as one of the main sources of the calorific value of the finished coal briquettes, provides approximately 20 or so calorific value. At the same time, tar is also one of the main binders.

[0046] The feeding port of the extrusion molding machine 5 is communicated with the discharging port of the mixing bin 4. In this embodiment, the following settings can be made. A first conveyor belt 14 is provided between the mixing bin 4 and the extrusion molding machine 5. One end of the first conveyor belt 14 is located at the discharging port of the mixing bin 4, and the other end of the first conveyor belt 14 is located at the extrusion molding machine 5.

[0047] The feeding port of the hot air drying furnace 6 is communicated with the discharging port of the extrusion molding machine 5. In this embodiment, it can also be set that a second conveyor belt 15 is provided between the extrusion molding machine 5 and the hot air drying furnace 6. One end of the second conveyor belt 15 is located at the discharging port of the extrusion molding machine 5, and the other end of the second conveyor belt 15 is located at the feeding port of the hot air drying furnace 6.

[0048] The discharging port of the extrusion molding machine 5 is arranged at the lower part of the extrusion molding machine 5, and the feeding port of the hot air drying furnace 6 is located at the upper part of the hot air drying furnace 6. The second conveyor belt 15 is arranged at an angle with the hot air drying furnace 6.

[0049] The hot air drying furnace 6 is provided with a first discharging port and a second discharging port. The first discharging port is used for discharging waste gas, and the second discharging port is used for outputting desulfurized coal briquettes.

[0050] The equipment for preparing desulfurized coal briquettes further includes a tar storage tank 8, and the discharging port of the tar storage tank 8 is communicated with the feeding port of the metering pump 2.

[0051] The equipment for preparing desulfurized coal briquettes further includes a tar heater 9 and a flue gas hot water heat exchanger 10. The tar heater 9 is arranged between the tar storage tank 8 and the flue gas hot water heat exchanger 10. The flue gas hot water heat exchanger 10 is provided with an air inlet and an air outlet. The air inlet is used for inputting the waste flue gas of the internal combustion power generation unit, and the air outlet is communicated with the hot air drying furnace 6.

[0052] The equipment for preparing desulfurized coal briquettes further includes a fan 11 and a temperature transmitter 12. The fan 11 and the temperature transmitter 12 are arranged between the flue gas hot water heat exchanger 10 and the hot air drying furnace 6. The air input by the fan 11 is mixed with the waste flue gas of the internal combustion power generation unit to form mixed air and input it into the hot air drying furnace 6.

[0053] The equipment for preparing desulfurized coal briquettes further includes a flue gas dust collector 13, and the feeding port of the flue gas dust collector 13 is communicated with the first discharging port of the hot air drying furnace 6.

[0054] In this embodiment, the waste flue gas of the internal combustion power generation unit is used as the heat source, which can improve the recovery level of this embodiment and reduce the preparation cost. Of course, without considering the cost, the waste flue gas of the internal combustion power generation unit can also be replaced by electrically heating air.

[0055] In this embodiment, crushed coal, slag, desulfurizing agent and tar produced by the gasifier are stirred, pressed and dried to produce desulfurized coal briquettes, so that various by-products produced by the gasifier can be recycled and utilized, thereby reducing processing costs and complexity.

[0056] In addition, the finished coal blocks produced in this embodiment can improve the adaptability of the coal gasifier to the incoming materials, which can appropriately reduce the procurement cost of raw materials. At the same time, since the addition of the desulfurizing agent plays a role in desulfurization, it can reduce the generation of H2S and reduce the operating cost of coal gas desulfurization.

[0057] This embodiment also provides a method for preparing a desulfurized coal block. The method for preparing a desulfurized coal block is implemented by the above-mentioned equipment, and the method for preparing a desulfurized coal block includes the following steps:

[0058] S100. Weigh crushed coal, slag, desulfurizing agent and tar according to a preset ratio.

[0059] The preset ratio of crushed coal, slag, desulfurizer and tar is 65:17:8:10.

[0060] According to the above preset ratio, the first weighing feeder 110 is used to weigh the slag, the second weighing feeder 120 is used to weigh the crushed coal, the third weighing feeder 130 is used to weigh the desulfurizing agent, and the tar is pumped out in proportion through the metering pump 2.

[0061] In this embodiment, the sulfur-fixing agent can be CaO, Fe2O3 or MgO or a mixture thereof, as long as it has the functions of catalysis and sulfur fixation, and is not limited here.

[0062] S200. Pre-mix the crushed coal, slag and desulfurizing agent, add tar after mixing evenly, and mix again until uniform.

[0063] Compared with adding crushed coal, slag, desulfurizing agent and tar into the mixing bin 4 for stirring at one time, pre-stirring can stir the crushed coal, slag and desulfurizing agent, which are all solid substances, more evenly, and then adding liquid tar after stirring evenly. This stirring method can improve the stirring uniformity.

[0064] S300. The uniformly mixed mixture is pressed into a block-shaped semi-finished product through an extruder 5.

[0065] The mixture is conveyed from the mixing bin 4 to the extrusion molding machine 5 via the first conveyor belt 14, and then the mixture is mechanically extruded in the extrusion molding machine 5 to form a dense semi-finished coal block, and then output via the second conveyor belt 15. In this embodiment, the diameter of the semi-finished product is 40mm to 60mm. In this embodiment, it can be set that the semi-finished product is a 50mm spherical block.

[0066] S400. After introducing a mixed gas of low-temperature flue gas and air into the hot air drying furnace 6 and curing for a preset time, qualified finished desulfurized coal blocks are obtained.

[0067] The low-temperature flue gas comes from the waste flue gas of the internal combustion generator set. However, due to the relatively high temperature of the waste flue gas of the internal combustion generator set, too high a temperature will cause the tar in the coal blocks to volatilize. It needs to be mixed with air and reduced to below 50-70 °C before entering the hot air drying furnace 6.

[0068] Specifically, after the waste flue gas of the internal combustion generator set enters the flue gas hot water heat exchanger 10, it becomes low-temperature flue gas below 150 °C. Its heat is transferred to the circulating water, and the heat of the circulating water heats the tar through the tar heater 9 to ensure its fluidity. The outlet of the flue gas hot water heat exchanger 10 is low-temperature flue gas below 150 °C. The air extracted by the fan 11 is mixed with the low-temperature flue gas to form low-temperature drying gas at 50-70 °C and enters the hot air drying furnace 6 to dry and shape the semi-finished coal blocks. Finally, it is discharged into the atmosphere after being dust-removed and purified by the flue gas dust collector 13.

[0069] In this embodiment, the flow rate of the waste flue gas of the internal combustion generator set is jointly controlled by the regulating valve and the temperature transmitter 12 to ensure that the flue gas temperature entering the hot air drying furnace 6 meets the requirements.

[0070] The calorific value of the finished coal blocks prepared in this embodiment is about 4200 Kcal / Kg, and the hardness is high, which can meet the requirements for use in fixed coal gas generators.

[0071] The finished coal blocks will undergo processes such as dry distillation, reduction, and oxidation in the coal gas generator. The sulfur in the coal will generate SO2 during the oxidation process and then be reduced to generate H2S in a reducing atmosphere. In the finished coal blocks prepared by this method, due to the addition of Ca, at high temperatures, the SO2 generated during the oxidation process can react with Ca to form CaSO3, thus playing a role in sulfur fixation and reducing the generation of H2S.

[0072] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A preparation method of desulfurized coal blocks, characterized in that, Including: Weigh crushed coal, slag, sulfur fixative, and tar in a preset ratio; Pre-stir the crushed coal, slag, and sulfur fixative, and after stirring evenly, add tar and stir again until evenly mixed; Press the evenly mixed mixture into a block-shaped semi-finished product through an extrusion molding machine; Pass a mixed gas of low-temperature flue gas and air into a hot air drying furnace, and after curing for a preset time, obtain a qualified finished desulfurized coal block.

2. The preparation method of the desulfurized coal briquette according to claim 1, characterized in that, The preset ratio of crushed coal, slag, sulfur fixative, and tar is 65:17:8:

10.

3. The preparation method of the desulfurized coal briquette according to claim 1, wherein The diameter of the semi-finished product is 40 mm to 60 mm.

4. An apparatus for preparing desulfurized coal briquettes, characterized in that, The equipment for preparing the desulfurized coal block is used to implement the method for preparing the desulfurized coal block according to any one of claims 1 to 3, and the equipment for preparing the desulfurized coal block includes a weighing feeder, a metering pump, a mixing bin, an extrusion molding machine, and a hot air drying furnace. The discharge port of the weighing feeder is communicated with the first feed port of the mixing bin, the discharge port of the metering pump is communicated with the first feed port of the mixing bin, the feed port of the extrusion molding machine is communicated with the discharge port of the mixing bin, and the feed port of the hot air drying furnace is communicated with the discharge port of the extrusion molding machine.

5. The equipment for preparing desulfurized coal briquettes according to claim 4, characterized in that, A first conveyor belt is provided between the mixing bin and the extrusion molding machine. One end of the first conveyor belt is located at the discharge port of the mixing bin, and the other end of the first conveyor belt is located at the extrusion molding machine.

6. The equipment for preparing desulfurized coal briquettes according to claim 4, characterized in that, A second conveyor belt is provided between the extrusion molding machine and the hot air drying furnace. One end of the second conveyor belt is located at the discharge port of the extrusion molding machine, and the other end of the second conveyor belt is located at the feed port of the hot air drying furnace.

7. The equipment for preparing desulfurized coal briquettes according to claim 6, characterized in that, The discharge port of the extrusion molding machine is arranged at the lower part of the extrusion molding machine, the feed port of the hot air drying furnace is located at the upper part of the hot air drying furnace, and the second conveyor belt is arranged at an angle with the hot air drying furnace.

8. The equipment for preparing desulfurized coal briquettes according to claim 4, wherein, The hot air drying furnace is provided with a first discharge port and a second discharge port. The first discharge port is used for discharging waste gas, and the second discharge port is used for outputting desulfurized coal blocks.

9. The equipment for preparing desulfurized coal briquettes according to claim 4, characterized in that, It further includes a tar storage tank, and the discharge port of the tar storage tank is communicated with the feed port of the metering pump.

10. The device for preparing desulfurized coal briquettes according to claim 9, characterized in that, It further includes a tar heater and a flue gas hot water heat exchanger. The tar heater is arranged between the tar storage tank and the flue gas hot water heat exchanger. The flue gas hot water heat exchanger is provided with an air inlet and an air outlet. The air inlet is used for inputting waste flue gas from an internal combustion generator set, and the air outlet is communicated with the hot air drying furnace.

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