Drying and blending combustion device for byproduct fine slag of gasification furnace

Abstract

The utility model discloses a gasification furnace byproduct fine slag drying and blending combustion device, which belongs to the technical field of coal gasification process waste treatment and comprises a feeding pump, a drying and extruding component and a conveying device. The feeding pump feeds water-containing fine slag into the heating extrusion cavity, the drying extrusion assembly carries out filter pressing and heating drying on the fine slag, and the conveying device conveys dried filter cakes to a coal conveying belt of a thermal power plant for blending combustion. The drying and extruding assembly is composed of a supporting rack, a pressing heating piece, filter cloth, a vacuum pump, a pressing plate and a motor, the moisture content of fine slag is reduced through filter pressing and heating drying, and the fine slag is suitable for blending combustion. And the vacuum pump is used for pumping the air pressure in the heating extrusion cavity to-60 to-80 Kpa so as to reduce the water boiling point and promote water evaporation. A steam inlet and outlet is formed in the side edge of the pressing heating piece, and 0.4-0.6 Wpa low-pressure byproduct steam is introduced to heat and dry the fine slag. According to the device, efficient drying and resource utilization of the fine slag are achieved, environmental pollution is reduced, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal gasification process waste treatment technical field, especially relates to a gasification furnace byproduct fine slag drying mixed combustion device. BACKGROUND

[0002] In the coal gasification process, the gasification furnace is one of the core equipment, and its main function is to carry out partial oxidation reaction of the qualified coal water slurry produced in the preparation process and the high-purity oxygen produced by the air separation device under certain process conditions, to generate synthesis gas with CO, H2 and CO2 as main components. After these synthesis gas is treated by humidification, cooling, dust removal and the like, it is sent to the downstream shift process for further processing. In the gasification process, a large amount of black water is generated, and after the black water is treated by flashing and sedimentation, the heat is recovered and the ash water is regenerated and recycled, and at the same time, coarse slag and fine slag are generated. Among them, the fine slag is usually directly transported out for treatment due to its high carbon content and high moisture content, causing waste of resources and pollution of the environment. SUMMARY

[0003] The utility model discloses a gasification furnace byproduct fine slag drying mixed combustion device, solve the problem that the fine slag high moisture content in the prior art leads to direct mixed combustion, carry out drying treatment to the fine slag generated in the coal gasification process, reduce its water content so that it can be mixed into the coal for combustion, thereby realizing efficient drying and resource utilization of the fine slag, reducing environmental pollution and production cost.

[0004] To achieve the above object, the utility model provides a gasification furnace byproduct fine slag drying mixed combustion device, which comprises:

[0005] A feed pump is used to send the fine slag containing water into the heating extrusion cavity.

[0006] A drying extrusion assembly is connected with the feed pump and is used to filter press and heat dry the fine slag, and

[0007] A conveying device comprises a hopper and a conveying belt, the hopper is located below the drying extrusion assembly to receive the filter cake formed after the fine slag is dried and extruded by the drying extrusion assembly, and the conveying belt is arranged at the bottom of the hopper to convey the dried filter cake to the coal conveying belt of the thermal power plant for mixed combustion.

[0008] The drying extrusion assembly comprises:

[0009] A support rack is provided with a track.

[0010] A plurality of compression heating pieces are arranged on the track and configured to squeeze out the water in the fine slag to reduce the moisture content and heat the fine slag to vaporize the internal crystal water in the fine slag for drying and dehydration, and a space is formed between two adjacent compression heating pieces;

[0011] A filter cloth is arranged between the two compression heating pieces to enclose a plurality of heating and squeezing cavities, the feed pump is connected to the plurality of heating and squeezing cavities, and the plurality of heating and squeezing cavities are used to preliminarily filter the fine slag under the pressure of the feed pump;

[0012] A vacuum pump is connected to the plurality of heating and squeezing cavities and used to draw the air pressure in the heating and squeezing cavities to a preset value to reduce the boiling point of water, thereby facilitating the evaporation of water;

[0013] Two pressing plates are arranged on the track and located at the two ends of the plurality of compression heating pieces and configured to squeeze the heating and squeezing cavities to further reduce the moisture content of the fine slag;

[0014] A motor is arranged on one side of one of the pressing plates and used to drive the pressing plate.

[0015] Further, the bottom outlet of the hopper is aligned with the conveying belt, so that the filter cake in the hopper falls through the outlet onto the conveying belt.

[0016] Further, the vacuum pump draws the air pressure in the heating and squeezing cavities to a preset value of -60 to -80 Kpa.

[0017] Further, the compression heating piece is provided with a steam inlet and a steam outlet on the side, and the steam inlet and the steam outlet are used to introduce low-pressure by-product steam to heat and dry the fine slag.

[0018] Further, the air pressure of the low-pressure by-product steam is 0.4 to 0.6 Wpa.

[0019] Further, when the vacuum pump draws the air pressure in the heating and squeezing cavities to a preset value, the heating plate is used to heat the fine slag synchronously, and the heating temperature is 50 to 60 DEG C.

[0020] Further, a PLC control unit for controlling the entire working process is further included, the PLC control unit is electrically connected with the feed pump, the drying and squeezing assembly, and the conveying device, and the working process is a cycle of 2 hours.

[0021] Further, the process of conveying the filter cake to the thermal power plant is interrupted under the control of the PLC control unit to match the daily coal bunker feeding of the boiler of the thermal power plant.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] (1) The utility model discloses a drying extrusion assembly is set up, and the moisture content of the fine slag of gasification furnace byproduct is reduced from 70% to 30% or so, realizes the efficient drying and resource utilization of fine slag, saves the consumption of standard coal, and the standard coal of 6310.8 tons can be saved every year, and the comprehensive energy consumption of synthetic ammonia plant is reduced.

[0024] (2) The utility model discloses a vacuum pump is passed through, and the air pressure in heating extrusion chamber is extracted to the preset value-60~-80Kpa, promotes the evaporation of moisture, and the low-pressure byproduct steam of heating piece of combination pressure is passed in and is heated and dried to fine slag, reduces the environmental pollution of fine slag external transport handling, and the potential pollution risk to the environment is reduced.

[0025] (3) The utility model discloses a PLC control unit is automatically controlled the whole working process, and 2 hours are as a cycle, improves the energy utilization efficiency, and the conveying belt is interrupted to filter cake and is transported to the heat plant under the PLC control, and the production process is optimized with the boiler daily coal bunker feeding.

[0026] Summarized above, the utility model discloses a drying extrusion assembly is set up, and the moisture content of the fine slag of gasification furnace byproduct is reduced from 70% to 30% or so, realizes the efficient drying and resource utilization of fine slag, saves the consumption of standard coal, and the standard coal of 6310.8 tons can be saved every year, and the comprehensive energy consumption of synthetic ammonia plant is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure schematic drawing of the drying and blending burning device for the fine slag of gasification furnace byproduct provided by the utility model embodiment;

[0028] Label explanation: 1, feed pump;2, drying extrusion assembly;2-1, support rack, 2-2, pressure heating piece;2-3, filter cloth;2-4, pressing plate;2-5, motor;2-6, heating extrusion chamber;3, hopper;4, conveying belt. DETAILED DESCRIPTION

[0029] The utility model will be further described below in conjunction with the drawings. The following embodiments are only used to explain the technical scheme of the utility model more clearly, and cannot limit the protection scope of the utility model.

[0030] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "upper", "lower", "horizontal" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0032] As shown in Figure 1 The utility model provides a kind of gasification furnace by-product fine slag drying mixed burning device, comprising:

[0033] Feed pump 1 is used to send water-containing fine slag into heating extrusion cavity 2-6;

[0034] Drying extrusion assembly 2 is connected with feed pump 1, for filtering and heating drying to fine slag, and

[0035] Conveying device, conveying device includes hopper 3 and conveying belt 4, hopper 3 is located below drying extrusion assembly 2, to receive the filter cake formed after fine slag is dried and extruded into drying extrusion assembly 2, conveying belt 4 is arranged at the bottom of hopper 3, for conveying filter cake after drying to the coal conveying belt of thermal power plant to carry out mixed burning;

[0036] Drying extrusion assembly 2 includes:

[0037] Supporting rack 2-1 is provided with track on supporting rack 2-1;

[0038] A plurality of pressing and heating pieces 2-2 are located on the track and are configured to extrude water in fine slag to reduce moisture content and heat fine slag, so that internal crystal water in fine slag is vaporized to dry and dehydrate, and a spacing is formed between adjacent two pressing and heating pieces 2-2.

[0039] The filter cloth 2-3 is arranged between the two pressing and heating plates 2-2 to enclose a plurality of heating and pressing cavities 2-6, and the feed pump 1 is connected to the plurality of heating and pressing cavities 2-6, so that the plurality of heating and pressing cavities 2-6 can preliminarily filter the fine slag under the pressure of the feed pump 1;

[0040] The vacuum pump is connected to the plurality of heating and pressing cavities 2-6, and is used to draw the air pressure in the heating and pressing cavities 2-6 to a preset value to reduce the boiling point of water, so as to promote the evaporation of water.

[0041] The two pressing plates 2-4 are arranged on the track and located at the two ends of the plurality of pressing and heating plates 2-2, and are configured to press the heating and pressing cavities 2-6 to further reduce the water content of the fine slag.

[0042] The motor 2-5 is arranged on one side of one of the pressing plates 2-4 and is used to drive the pressing plate 2-4.

[0043] Further, the bottom outlet of the hopper 3 is aligned with the conveying belt 4, so that the filter cake in the hopper 3 falls through the outlet onto the conveying belt 4.

[0044] Specifically, the vacuum pump draws the air pressure in the heating and pressing cavities 2-6 to a preset value of -60 to -80 Kpa.

[0045] Further, the pressing and heating plates 2-2 are provided with steam inlets and steam outlets on the sides, and the steam inlets and steam outlets are used to introduce low-pressure by-product steam to heat and dry the fine slag.

[0046] Preferably, the air pressure of the low-pressure by-product steam is 0.4 to 0.6 Wpa.

[0047] Preferably, when the vacuum pump draws the air pressure in the heating and pressing cavities to the preset value, the heating plate is used to heat the fine slag at the same time, and the heating temperature is 50 to 60℃.

[0048] Further, the gasification furnace by-product fine slag drying and blending device also comprises a PLC control unit for controlling the entire working process, and the PLC control unit is electrically connected with the feed pump 1, the drying and pressing assembly 2 and the conveying device, and the working process is a cycle of 2 hours.

[0049] Specifically, the process of conveying the filter cake to the thermal power plant by the conveying belt 4 is intermittently controlled by the PLC control unit to match the feeding of the boiler daily coal bunker of the thermal power plant.

[0050] In use, the fine slag generated by coal gasification is filtered first, and is sent to the heating extrusion cavity through the feed pump 1, the pressure of the feed pump 1 is matched with the filter cloth 3, the fine slag is preliminarily filtered, the moisture content is reduced to 65%-70%, and the time is about 15 minutes. Then, the pressure filtration operation is performed, in the dry extrusion assembly 2, the pressing plate 2-4 is driven by the motor 2-5 to drive the compression heating sheet 2-2 to slide on the track, so that the heating extrusion cavity 2-6 is compressed, the water in the fine slag is further extruded, the moisture content is reduced to 40%-45%, and the time is about 30 minutes. Then, the vacuum degree in the heating extrusion cavity is extracted to the preset value of-60Kpa to-80Kpa through the vacuum pump, so that the boiling point of water is reduced, the low-pressure by-product steam is synchronously introduced into the clamping heating sheet 2-2 to heat the fine slag, the fine slag is heated to about 50℃-60℃, the internal crystal water in the material is vaporized, so that the purpose of drying and dewatering is achieved, and the moisture content of the fine slag is reduced to 20%-30%. Then, the filter cake conveying is performed, the filter cake after drying and extrusion is formed into the hopper 3, is conveyed to the coal conveying belt of the thermal power plant through the conveying belt 4 at the bottom of the hopper 3, and is mixed and burned, the PLC unit controls intermittently, and is matched with the boiler daily coal bunker feeding.

[0051] The fine slag and the steam generated by the coal gasification are recycled, so that the coal gasification coal resources are comprehensively utilized, the comprehensive energy consumption of the synthetic ammonia plant is reduced, and the energy consumption demand is met.

[0052] The fine slag recycling saves the standard coal consumption: 45.6t / d*30=1368t, the fine slag output is about 1368t per month, the output is relatively stable, the carbon content of the fine slag is about 24%, the fine slag is equivalent to about 384.4t of standard coal per month, the annual equivalent standard coal is about 4612.8t, the power raw coal can be saved by 525.9t per month (according to the 6th month 0.731 standard system), and it is estimated that 6310.8t of power raw coal can be saved per year.

[0053] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and deformations can be made without departing from the technical principles of the utility model, and these improvements and deformations should be regarded as the protection range of the utility model.

Claims

1. A gasification furnace by-product fine slag drying and co-combustion device, characterized by, The application relates to a device for drying and extruding fine sludge, comprising: a feed pump for feeding the water-containing fine sludge into a heating extrusion cavity of a drying extrusion assembly; the drying extrusion assembly is connected with the feed pump and is used for pressure filtration and heating drying of the fine sludge, and a conveying device, which comprises a hopper and a conveying belt, the hopper is arranged below the drying extrusion assembly to receive the filter cake formed after the fine sludge is dried and extruded by the drying extrusion assembly, and the conveying belt is arranged at the bottom of the hopper and is used for conveying the dried filter cake to a coal conveying belt of a thermal power plant for blending combustion. The drying extrusion assembly comprises: a support rack, wherein a track is arranged on the support rack; a plurality of pressing and heating pieces arranged on the track and configured to extrude water in the fine sludge to reduce the water content and heat the fine sludge to vaporize the internal crystal water in the fine sludge to dry and dehydrate, and a spacing is formed between two adjacent pressing and heating pieces; a filter cloth arranged between the two pressing and heating pieces to enclose a plurality of heating extrusion cavities, wherein the feed pump is connected with the plurality of heating extrusion cavities, and the plurality of heating extrusion cavities are used for preliminary filtration of the fine sludge under the pressure of the feed pump; a vacuum pump connected with the plurality of heating extrusion cavities and used for reducing the boiling point of water by extracting the air pressure in the heating extrusion cavities to a preset value so as to promote evaporation of water; two pressing plates arranged on the track and located at the two ends of the plurality of pressing and heating pieces and configured to extrude the heating extrusion cavities to further reduce the water content of the fine sludge; a motor arranged on one side of one of the pressing plates and used for driving the pressing plate.

2. The gasification furnace by-product fine slag drying and co-combustion device according to claim 1, characterized in that, The bottom outlet of the hopper is aligned with the conveying belt so that the filter cake in the hopper falls onto the conveying belt through the outlet.

3. The gasification furnace by-product fine slag drying and co-combustion device according to claim 1, characterized in that, Steam inlets and steam outlets are arranged on the side edges of the pressing and heating pieces, and the steam inlets and the steam outlets are used for introducing low-pressure by-product steam to heat and dry the fine sludge.

4. The gasification furnace by-product fine slag drying and co-combustion device according to claim 1, characterized in that, The device further comprises a PLC control unit for controlling the whole working process, and the PLC control unit is electrically connected with the feed pump, the drying extrusion assembly and the conveying device.

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