Coal gasification slag incineration system and method

Abstract

The invention provides an incineration system and method for coal gasification slag, and belongs to the field of solid waste treatment.The system comprises a stock bin, a drying and granulating device, a screening device, combustion equipment, an air pre-heater and a tail gas treatment device; the gasification fine slag and the gasification coarse slag are mixed through the stock bin, and a mixed material is obtained; the drying and granulating device is used for drying and granulating the mixed material; the screening device screens the dried and granulated materials to obtain a first screened material with the particle size larger than a preset particle size value and a second screened material with the particle size not larger than the preset particle size value, the first screened material is conveyed to combustion equipment to be incinerated, and the second screened material is conveyed to a stock bin; the air pre-heater is used for recovering heat of flue gas discharged by the combustion equipment and conveying the treated flue gas to the tail gas treatment device; and the tail gas treatment device performs waste gas purification treatment on the flue gas. By applying the system, the calorific value of the coal gasification slag material can be increased, the particle size of material particles is increased, and stable combustion of the material is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment, and in particular to a system and method for incinerating coal gasification slag. Background Art

[0002] In the coal chemical industry, coal gasification slag is one of the main solid wastes in the production scene. Coal gasification slag mainly includes two types of high-carbon solid wastes: coarse gasification slag and fine gasification slag. In the solid waste treatment process, coal gasification slag needs to be treated as waste.

[0003] With the development of waste treatment technology, the disposal of solid waste has gradually changed from landfill to incineration. Among the related disposal methods of coal gasification slag, the current main method is to transport each type of coal gasification slag to the boiler for mixed combustion, and then realize the incineration of coal gasification slag.

[0004] The inventors have found through research that due to the characteristics of gasification fine slag such as fine particles, low calorific value, and low volatile content, during the incineration process, the mixed combustion materials will have problems such as difficulty in ignition in the early stage, difficult combustion of embers in the later stage, low mixing ratio, and increased carbon content in fly ash, resulting in low overall combustion efficiency and poor resource utilization. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a system and method for incinerating coal gasification slag to solve the problem that the mixed materials in the existing coal gasification slag disposal method are difficult to ignite and difficult to burn, resulting in low combustion efficiency and poor resource utilization.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A coal gasification slag incineration system, comprising:

[0008] Silos, drying and granulating devices, screening devices, combustion equipment, air preheaters and tail gas treatment devices;

[0009] The feed end of the silo is connected to a conveying device for coal gasification slag, and the discharge end of the silo is connected to a feed end of the drying and granulating device; the coal gasification slag includes fine gasification slag and coarse gasification slag;

[0010] The discharge end of the drying and granulating device is connected to the feed end of the screening device, and the screening device is provided with a first discharge end and a second discharge end, the first discharge end is connected to the feed end of the combustion device, and the second discharge end is connected to the feed end of the silo;

[0011] The flue gas discharge pipe of the combustion equipment is connected to the flue gas input end of the air preheater, and the flue gas output end of the air preheater is connected to the input end of the tail gas treatment device;

[0012] The silo is used to mix the gasified fine slag and the gasified coarse slag fed into the silo to obtain a coal gasification slag mixed material, and transport the coal gasification slag mixed material to the drying and granulating device;

[0013] The drying and granulating device is used to dry and granulate the coal gasification slag mixture to obtain dry granulated material, and transport the dry granulated material to the screening device;

[0014] The screening device is used to screen the dry granulated material according to a preset particle size value to obtain a first screened material and a second screened material, and to convey the first screened material to the combustion device for incineration, and to convey the second screened material to the silo; the first screened material is a material whose particle size is larger than the preset particle size value, and the second screened material is a material whose particle size is not larger than the preset particle size value;

[0015] The air preheater is used to perform heat recovery treatment on the flue gas discharged by the combustion equipment, and transport the flue gas after heat recovery treatment to the tail gas treatment device;

[0016] The exhaust gas treatment device is used to perform exhaust gas purification on the flue gas that has undergone heat recovery treatment, and discharge the exhaust gas that has undergone exhaust gas purification into the atmosphere.

[0017] In the above system, optionally, the drying medium of the drying and granulating device is the flue gas discharged by the combustion equipment.

[0018] The above system may optionally further include:

[0019] A first condenser, wherein the input end of the first condenser is connected to the tail gas discharge end of the drying and granulating device, and the output end of the first condenser is connected to the input end of the tail gas treatment device.

[0020] In the above system, optionally, the drying medium of the drying and granulating device is steam.

[0021] The above system may optionally further include:

[0022] Dust removal device and second condenser;

[0023] The input end of the dust removal device is connected to the tail gas discharge end of the drying and granulating device, the output end of the dust removal device is connected to the input end of the second condenser, and the output end of the second condenser is connected to the atmosphere.

[0024] In the above system, optionally, the tail gas treatment device includes a dust collector and a desulfurization tower;

[0025] The input end of the dust collector is the input end of the tail gas treatment device, and the output end of the dust collector is connected to the input end of the desulfurization tower.

[0026] In the above system, optionally, a stirring device and an arch-breaking slide are provided in the silo.

[0027] In the above system, optionally, the silo transports the coal gasification slag mixture to the drying and granulating device through a preset pumping pipeline system.

[0028] In the above system, optionally, the silo conveys the coal gasification slag mixture to the drying and granulating device via a preset belt feeder or scraper feeder.

[0029] A method for incinerating coal gasification slag, comprising:

[0030] Mixing the gasification fine slag to be disposed with the gasification coarse slag to obtain a coal gasification slag mixed material;

[0031] Drying and granulating the coal gasification slag mixture to obtain a dry granulated material;

[0032] The dried granulated material is screened according to a preset particle size value to obtain a first screened material and a second screened material; the first screened material is a material whose particle size is larger than the preset particle size value, and the second screened material is a material whose particle size is not larger than the preset particle size value;

[0033] The first screened material is transported to a combustion device for incineration, and the second screened material is mixed with the material to be disposed of.

[0034] A coal gasification slag incineration system provided based on the above-mentioned embodiment of the present invention includes: a silo, a drying and granulating device, a screening device, a combustion equipment, an air preheater and an exhaust gas treatment device; the feed end of the silo is connected to the conveying device of the coal gasification slag, and the discharge end of the silo is connected to the feed end of the drying and granulating device; the discharge end of the drying and granulating device is connected to the feed end of the screening device, and the screening device is provided with a first discharge end and a second discharge end, the first discharge end is connected to the feed end of the combustion equipment, and the second discharge end is connected to the feed end of the silo; the flue gas exhaust pipeline of the combustion equipment is connected to the flue gas input end of the air preheater, and the flue gas output end of the air preheater is connected to the input end of the exhaust gas treatment device; the silo is used to mix the gasification fine slag and the gasification coarse slag fed into the silo to obtain a coal gasification slag mixed material, and transport the coal gasification slag mixed material to the dry A drying and granulating device; a drying and granulating device, used to dry and granulate the gasification slag mixture to obtain dry granulated material, and convey the dry granulated material to a screening device; a screening device, used to screen the dry granulated material according to a preset particle size value to obtain a first screened material and a second screened material, convey the first screened material to a combustion device for incineration, and convey the second screened material to a silo; the first screened material is a material with a particle size greater than a preset particle size value, and the second screened material is a material with a particle size not greater than the preset particle size value; an air preheater, used to perform heat recovery treatment on the flue gas discharged from the combustion device, and convey the flue gas after the heat recovery treatment to an exhaust gas treatment device; an exhaust gas treatment device, used to perform exhaust gas purification treatment on the flue gas after the heat recovery treatment, and discharge the exhaust gas after the exhaust gas purification treatment into the atmosphere. By using the system provided by the embodiment of the present invention, in the process of disposing gasified fine slag, the gasified fine slag and the gasified coarse slag are first mixed, and the mixed material is dried and granulated to obtain a dry granulated material, and the dry granulated material with a certain particle size is put into the equipment for combustion. Since the water content of the gasified coarse slag is lower than that of the gasified fine slag, the water content of the gasified fine slag material can be reduced by mixing the two types of coal gasification slags, and the water content of the material can be further reduced by drying the mixed material, and the calorific value of the material can be increased, making the mixed material flammable. Since the particle size of the original coal gasification slag is usually at the micron level, the original coal gasification slag stays in the dense phase area for a very short time after entering the boiler, and it is difficult to achieve effective combustion of the coal gasification slag. The system provided by the embodiment of the present invention can increase the particle diameter of the material by granulating the mixed material, so that the residence time of the material in the dense phase area during the combustion process is increased, so that the incinerated material can be stably burned, which is conducive to improving the combustion efficiency and resource utilization rate of the coal gasification slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 A schematic structural diagram of a coal gasification slag incineration system provided by an embodiment of the present invention;

[0037] Figure 2 Another structural schematic diagram of a coal gasification slag incineration system provided by an embodiment of the present invention;

[0038] Figure 3 Another structural schematic diagram of a coal gasification slag incineration system provided by an embodiment of the present invention;

[0039] Figure 4 A method flow chart of a method for incinerating coal gasification slag provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0042] The embodiment of the present invention provides a system for incinerating coal gasification slag, which can be applied to the waste disposal scenario of coal gasification slag generated in the coal chemical industry. The structural schematic diagram of the system can be shown as follows: Figure 1 As shown, the system includes:

[0043] Silo 101, drying and granulating device 102, screening device 103, combustion equipment 104, air preheater 105 and tail gas treatment device 106;

[0044] The feed end of the silo 101 is connected to a conveying device for coal gasification slag, and the discharge end of the silo 101 is connected to a feed end of the drying and granulating device 102; the coal gasification slag includes gasification fine slag and gasification coarse slag;

[0045] The discharge end of the drying and granulating device 102 is connected to the feed end of the screening device 103. The screening device 103 is provided with a first discharge end and a second discharge end. The first discharge end is connected to the feed end of the combustion device 104, and the second discharge end is connected to the feed end of the silo 101.

[0046] The flue gas discharge pipe of the combustion device 104 is connected to the flue gas input end of the air preheater 105, and the flue gas output end of the air preheater 105 is connected to the input end of the tail gas treatment device 106;

[0047] The silo 101 is used to mix the gasified fine slag and the gasified coarse slag fed into the silo 101 to obtain a coal gasified slag mixed material, and transport the coal gasified slag mixed material to the drying and granulating device 102;

[0048] The drying and granulating device 102 is used to dry and granulate the coal gasification slag mixture to obtain dry granulated material, and transport the dry granulated material to the screening device 103;

[0049] The screening device 103 is used to screen the dry granulated material according to a preset particle size value to obtain a first screened material and a second screened material, and to convey the first screened material to the combustion device 104 for incineration, and to convey the second screened material to the silo 101; the first screened material is a material with a particle size larger than the preset particle size value, and the second screened material is a material with a particle size not larger than the preset particle size value;

[0050] The air preheater 105 is used to perform heat recovery treatment on the flue gas discharged by the combustion device 104, and transport the flue gas after heat recovery treatment to the tail gas treatment device 106;

[0051] The exhaust gas treatment device 106 is used to perform exhaust gas purification on the flue gas that has undergone heat recovery treatment, and discharge the exhaust gas that has undergone exhaust gas purification into the atmosphere.

[0052] In the system provided by the embodiment of the present invention, a silo, a drying and granulating device, a screening device, a combustion device, an air preheater and an exhaust gas treatment device are provided. The system is used for waste disposal of coal gasification slag containing gasification fine slag and gasification coarse slag. The gasification fine slag is also commonly referred to as gasification filter cake, and the moisture content of the gasification fine slag is usually in the range of 40% to 60%. The moisture content of the gasification coarse slag is usually in the range of 10% to 50%.

[0053] In the embodiment of the present invention, the feed end of the silo is connected to a conveying device (such as a conveying pipeline) for coal gasification slag, that is, the coarse gasification slag and fine gasification slag generated in the production scene and requiring waste disposal can be delivered to the silo by the corresponding conveying device. The coarse gasification slag and fine gasification slag to be disposed of can be mixed in the silo.

[0054] The discharge end of the silo is connected to the feed end of the drying and granulating device, that is, the material output after the silo processing can enter the drying and granulating device. The drying and granulating device is a device used for drying and granulating materials. The device can dry the input materials and granulate the dried materials to process the materials into granules of a certain shape and size.

[0055] The discharge end of the drying and granulating device is connected to the feed end of the screening device, that is, the material output after being processed by the drying and granulating device can enter the screening device. The screening device refers to a device that screens the material according to a predetermined standard. In the embodiment of the present invention, the screening device screens the material according to a preset particle size value, screens out the material particles whose particle size is larger than the preset particle size value, and separates the input material into the material whose particle size is larger than the preset particle size value and the material whose particle size is not larger than the preset particle size value.

[0056] The screening device is provided with two discharge ends, which are respectively used to convey the separated materials. One discharge end (i.e., the first discharge end) of the screening device is used to output materials whose particle size is larger than the preset particle size value. The discharge end is connected to the feed end of the combustion device, that is, the materials separated by the screening device and whose particle size is larger than the preset particle size value will be sent to the combustion device for combustion. The other discharge end (i.e., the second discharge end) of the screening device is used to output materials whose particle size is not larger than the preset particle size value. The discharge end is connected to the feed end of the silo, that is, the materials separated by the screening device and whose particle size is not larger than the preset particle size value will be sent to the silo and remixed with the materials in the silo. The preset particle size value can be set according to actual needs, for example, it can be set to 0.5mm.

[0057] The combustion equipment can be equipment that can burn materials, such as a boiler or an incinerator. The flue gas exhaust pipe of the combustion equipment is connected to the flue gas input end of the air preheater, that is, the flue gas discharged by the combustion equipment will enter the air preheater. The air preheater is an air preheater, which can recycle the heat in the flue gas. The heat of the flue gas passes through the heat sink to preheat the intake air of the combustion equipment, and the utilized flue gas is output through the flue gas output end. The flue gas output end of the air preheater is connected to the input end of the exhaust gas treatment device, that is, the flue gas output by the air preheater will enter the exhaust gas treatment device, and the flue gas treated by the exhaust gas treatment device can be discharged into the atmosphere. The exhaust gas treatment device is a device used to harmlessly treat gases, which can be set based on various gas purification technologies.

[0058] During the operation of the system provided by the embodiment of the present invention, the gasified fine slag with a moisture content of 40% to 60% and the gasified coarse slag with a moisture content of 10% to 50% generated in the production process will be sent to the silo, and the gasified fine slag and the gasified coarse slag will be mixed in the silo to form a mixed material, and the moisture content of the mixed material is greater than or equal to 40%. The mixed material can be sent to the drying and granulation device through the corresponding feeding mechanism, and the drying and granulation device can use a high-temperature drying medium to dry the mixed material, and the moisture content of the dried material is between 10% and 25%. The drying and granulation device can granulate the dried material, make the dried material into material particles of a certain shape and size, and send the granulated material to the screening device. The screening device separates the input materials, and sends the materials with particle sizes larger than the preset particle size value (i.e., the first screened materials) to the combustion equipment, and sends the materials with particle sizes not larger than the preset particle size value (i.e., the second screened materials) to the silo, and the materials sent to the silo will be mixed with the gasified fine slag and gasified coarse slag materials to be disposed of in the silo. The combustion equipment will burn the input materials, and the flue gas emitted by the combustion equipment will be discharged into the atmosphere after being treated by the air preheater and the tail gas treatment device.

[0059] The system provided based on the embodiment of the present invention includes: a silo, a drying and granulating device, a screening device, a combustion equipment, an air preheater and an exhaust gas treatment device; the feed end of the silo is connected to the conveying device of the coal gasification slag, and the discharge end of the silo is connected to the feed end of the drying and granulating device; the coal gasification slag includes gasification fine slag and gasification coarse slag; the discharge end of the drying and granulating device is connected to the feed end of the screening device, and the screening device is provided with a first discharge end and a second discharge end, the first discharge end is connected to the feed end of the combustion equipment, and the second discharge end is connected to the feed end of the silo; the flue gas exhaust pipeline of the combustion equipment is connected to the flue gas input end of the air preheater, and the flue gas output end of the air preheater is connected to the input end of the exhaust gas treatment device; the silo is used to mix the gasification fine slag and the gasification coarse slag fed into the silo to obtain a coal gasification slag mixed material, and the coal gasification slag mixed material The gasification slag mixture is transported to a drying and granulating device; the drying and granulating device is used to dry and granulate the gasification slag mixture to obtain dry granulated material, and the dry granulated material is transported to a screening device; the screening device is used to screen the dry granulated material according to a preset particle size value to obtain a first screened material and a second screened material, the first screened material is transported to the combustion equipment for incineration, and the second screened material is transported to the silo; the first screened material is a material with a particle size greater than the preset particle size value, and the second screened material is a material with a particle size not greater than the preset particle size value; an air preheater is used to perform heat recovery treatment on the flue gas discharged from the combustion equipment, and transport the flue gas after the heat recovery treatment to an exhaust gas treatment device; the exhaust gas treatment device is used to perform exhaust gas purification treatment on the flue gas after the heat recovery treatment, and discharge the exhaust gas after the exhaust gas purification treatment into the atmosphere. By using the system provided by the embodiment of the present invention, in the process of disposing gasified fine slag, the gasified fine slag and the gasified coarse slag are first mixed, and the mixed material is dried and granulated to obtain a dry granulated material, and the dry granulated material with a certain particle size is put into the equipment for combustion. Since the water content of the gasified coarse slag is lower than that of the gasified fine slag, the water content of the gasified fine slag material can be reduced by mixing the two types of coal gasification slags, and the water content of the material can be further reduced by drying the mixed material, and the calorific value of the material can be increased, making the mixed material flammable. Since the particle size of the original coal gasification slag is usually at the micron level, the original coal gasification slag stays in the dense phase area for a very short time after entering the boiler, and it is difficult to achieve effective combustion of the coal gasification slag. The system provided by the embodiment of the present invention can increase the particle diameter of the material by granulating the mixed material, so that the residence time of the material in the dense phase area during the combustion process is increased, so that the incinerated material can be stably burned, which is conducive to improving the combustion efficiency and resource utilization rate of the coal gasification slag.

[0060] exist Figure 1 On the basis of the system shown, in the system provided by the embodiment of the present invention, the drying medium of the drying and granulating device is the flue gas discharged by the combustion equipment.

[0061] In the system provided by the embodiment of the present invention, the flue gas discharged by the combustion equipment is introduced into the drying and granulating device as the drying medium of the drying and granulating device. The drying and granulating device dries and granulates the material by contact heat exchange based on the heat of the high-temperature flue gas.

[0062] Based on the system provided by the embodiment of the present invention, the flue gas discharged by the combustion equipment can be used as the heat source of the drying and granulation device, and the waste heat of the flue gas can be recovered and utilized, thereby improving the utilization rate of resources.

[0063] Based on the system provided in the above embodiment, the method provided in the embodiment of the present invention further includes:

[0064] A first condenser, wherein the input end of the first condenser is connected to the tail gas discharge end of the drying and granulating device, and the output end of the first condenser is connected to the input end of the tail gas treatment device.

[0065] In the system provided by the embodiment of the present invention, when high-temperature flue gas is used as the drying medium of the drying and granulating device, a condenser is provided and combined with an exhaust gas treatment device to treat the exhaust gas of the drying and granulating device, and the exhaust gas discharge end of the drying and granulating device is connected to the input end of the condenser, that is, the exhaust gas discharged by the drying and granulating device will enter the condenser for condensation, and the condensed water can be collected and sent to the black water pool for reuse. The output end of the condenser is connected to the input end of the exhaust gas treatment device, that is, the gas condensed by the condenser will enter the exhaust gas treatment device for gas purification treatment, and then discharged into the atmosphere.

[0066] Based on the system provided by the embodiment of the present invention, when high-temperature flue gas is used as a drying medium, the tail gas treatment device can be used to purify the tail gas discharged by the drying and granulation device to achieve harmless discharge of the tail gas.

[0067] exist Figure 1 On the basis of the system shown, in the system provided by the embodiment of the present invention, the drying medium of the drying granulation device is steam.

[0068] In the system provided by the embodiment of the present invention, the steam generated by the combustion device is introduced into the drying and granulating device as the drying medium of the drying and granulating device. The drying and granulating device dries and granulates the material by non-contact heat exchange based on the heat of the high-temperature steam.

[0069] Based on the system provided in the above embodiment, the method provided in the embodiment of the present invention further includes:

[0070] Dust removal device and second condenser;

[0071] The input end of the dust removal device is connected to the tail gas discharge end of the drying and granulating device, the output end of the dust removal device is connected to the input end of the second condenser, and the output end of the second condenser is connected to the atmosphere.

[0072] In the system provided by the embodiment of the present invention, when high-temperature steam is used as the drying medium of the drying and granulating device, a dust removal device and a condenser are provided to process the tail gas discharged by the drying and granulating device. The dust removal device is a device used to separate dust from gas, such as a dust collector or a dust collector. The tail gas discharge end of the drying and granulating device is connected to the input end of the dust removal device, and the output end of the dust removal device is connected to the input end of the condenser. That is, the tail gas discharged by the drying and granulating device will enter the dust removal device, and the tail gas will be dust-removed by the dust removal device. The tail gas after the dust removal treatment will enter the condenser for condensation. The condensed water can be collected and sent to the black water pool for reuse, and the gas condensed by the condenser can be discharged into the atmosphere.

[0073] exist Figure 1 Based on the system shown in the figure, in the system provided by the embodiment of the present invention, the tail gas treatment device includes a dust collector and a desulfurization tower;

[0074] The input end of the dust collector is the input end of the tail gas treatment device, and the output end of the dust collector is connected to the input end of the desulfurization tower.

[0075] In the system provided by the embodiment of the present invention, a dust collector and a desulfurization tower are deployed in the tail gas treatment device. The input end of the tail gas treatment device is the input end of the dust collector, the output end of the dust collector is connected to the input end of the desulfurization tower, and the output end of the desulfurization tower can be used as the output end of the tail gas treatment device. During the operation of the system, the flue gas treated by the air preheater will enter the dust collector, the dust collector will perform dust removal on the flue gas, and the dust-removed flue gas will be sent to the desulfurization tower, the desulfurization tower will perform desulfurization on the flue gas, and the desulfurized gas will be discharged into the atmosphere.

[0076] It should be noted that, in the specific implementation process, the exhaust gas treatment device can be further deployed in combination with other gas purification devices, and is not limited to the examples in the system provided in the embodiments of the present invention.

[0077] Based on the system provided in the embodiment of the present invention, dust removal and desulfurization can be performed on the flue gas emitted by the combustion equipment, and the flue gas can be purified in multiple dimensions, which is beneficial to avoid air pollution caused by the emitted gas.

[0078] exist Figure 1 On the basis of the system shown, in the system provided by the embodiment of the present invention, a stirring device and an arch-breaking slide are provided in the silo.

[0079] In the system provided by the embodiment of the present invention, a stirring device and an arch-breaking slide are provided in the silo. During the operation of the system, the stirring device can be used to stir the materials in the silo so that the materials such as gasified fine slag and gasified coarse slag can be mixed evenly. The arch-breaking slide can be provided at the bottom of the silo to break the arches of the materials in the silo.

[0080] Based on the system provided in the embodiment of the present invention, during the material mixing process, the materials can be stirred and broken, which is conducive to evenly mixing the components of the materials and preventing material bridging, and is conducive to smoothly obtaining and outputting evenly mixed gasification slag mixed materials, thereby ensuring stable operation of the system.

[0081] exist Figure 1 On the basis of the system shown, in the system provided by the embodiment of the present invention, the silo transports the coal gasification slag mixture to the drying and granulating device through a preset pumping pipeline system.

[0082] In the system provided by the embodiment of the present invention, a pumping pipeline system can be preset as a feeding device between the silo and the drying and granulating device, that is, the gasification slag mixture output from the silo will be transported to the drying and granulating device by the pumping pipeline system.

[0083] In actual application scenarios, the material transportation method can be selected according to the transportation requirements of the gasification slag mixed material. In the embodiment of the present invention, for the gasification slag mixed material with a moisture content greater than 50%, a pumping pipeline system is used for material transportation. That is, if the moisture content of the gasification slag mixed material is greater than 50% in the production scenario, a pumping pipeline system can be set up for material transportation.

[0084] Based on the system provided in the embodiment of the present invention, a pumping pipeline system can be set up to realize the transportation of coal gasification slag mixed materials, and the material transportation of materials with high water content (slurry materials) can be realized.

[0085] exist Figure 1 On the basis of the system shown, in the system provided by the embodiment of the present invention, the silo conveys the coal gasification slag mixture to the drying and granulating device through a preset belt feeder or scraper feeder.

[0086] In the system provided by the embodiment of the present invention, a belt feeder or a scraper feeder can be preset as a feeding device between the silo and the drying granulation, that is, the gasification slag mixture output from the silo will be transported to the drying granulation device by the belt feeder or the scraper feeder.

[0087] In the embodiment of the present invention, a belt feeder or a scraper feeder is used to transport the coal gasification slag mixture with a moisture content of 40% to 50%. That is, if the moisture content of the coal gasification slag mixture is 40% to 50% in the production scenario, a belt feeder or a scraper feeder can be set to transport the material.

[0088] Based on the system provided by the embodiment of the present invention, a belt feeder or a scraper feeder can be set to realize the transportation of the coal gasification slag mixture, and the material transportation of materials with low moisture content (non-slurry materials) can be realized.

[0089] In order to better illustrate the system provided by the embodiment of the present invention, based on the systems provided by the above embodiments and in combination with actual application scenarios, the embodiment of the present invention provides another coal gasification slag incineration system.

[0090] The system provided in the embodiment of the present invention includes: a silo, a drying and granulating device, a screening device, a combustion device, an air preheater and an exhaust gas treatment device. The silo in the embodiment of the present invention is provided with a stirring device and an arch-breaking slide, the exhaust gas treatment device is provided with a dust collector and a desulfurization tower, and the combustion device is an incinerator.

[0091] In the system provided by the embodiment of the present invention, the drying medium of the drying and granulating device can be the high-temperature flue gas discharged by the combustion equipment. When the high-temperature flue gas is used as the drying medium of the drying and granulating device, the schematic structural diagram of the system provided by the embodiment of the present invention can be as follows: Figure 2 shown. Figure 2 The structure shown includes: a silo 201, a stirring device 202, an arch-breaking slide 203, a drying and granulating device 204, a screening device 205, an incinerator 206, a heating surface 207 of the incinerator, a condenser 208, an air preheater 209, a dust collector 210 and a desulfurization tower 211.

[0092] In the system provided by the embodiment of the present invention, the drying medium of the drying and granulating device can also be high-temperature steam heated by the combustion device. When high-temperature steam is used as the drying medium of the drying and granulating device, the schematic structural diagram of the system provided by the embodiment of the present invention can be as follows: Figure 3 shown. Figure 3 The structure shown includes: a silo 301, a stirring device 302, an arch-breaking slide 303, a drying and granulating device 304, a screening device 305, an incinerator 306, a heating surface of the incinerator 307, a dust removal device-condenser 308, an air preheater 309, a dust collector 310 and a desulfurization tower 311.

[0093] The incineration process of coal gasification slag implemented by the system provided in the embodiment of the present invention mainly includes:

[0094] The gasification filter cake (gasification fine slag) with a moisture content of 40% to 60% and the gasification coarse slag with a moisture content of 10% to 50% are fed into the silo, and a stirring device and an arch-breaking slide are arranged in the silo. The stirring device can stir the materials to mix the gasification fine slag, gasification coarse slag and unqualified particles to form a mixed material with a moisture content of ≥40%. An arch-breaking slide is arranged at the bottom of the silo to prevent the materials from bridging.

[0095] The mixed materials are sent to the drying and granulating device through the feeding device, and the materials are dried and granulated by high-temperature flue gas (air) or steam in the drying and granulating device. The moisture content of the dried particles is controlled at 10% to 25%. The dried and granulated materials are screened by the screening device, and the materials with a particle size less than or equal to 0.5mm are returned to the silo to be mixed, dried and granulated with the materials to be disposed of. The materials with a particle size greater than 0.5mm are sent to the fluidized bed incinerator for blending.

[0096] If the drying and granulating device uses high-temperature flue gas (air) for drying, the material is dried by contact heat exchange. The tail gas discharged by the drying and granulating device is condensed by the condenser and enters the flue gas discharge pipe of the combustion equipment. Together with the flue gas discharged by the combustion equipment, it enters the dust collector and desulfurization tower and is discharged into the atmosphere after gas purification.

[0097] If the drying and granulation device uses steam drying, the material is dried by non-contact heat exchange. The tail gas discharged by the drying and granulation device is discharged through the dust removal device and condenser. The condensed water is collected and sent to the black water pool for reuse. The treated tail gas can be directly discharged into the atmosphere.

[0098] Regarding the method of conveying materials from the silo to the drying and granulating device, if the gasified fine slag mixture in the production scenario is a slurry material with a moisture content greater than 50%, a pumping pipeline system is used for transportation; if the gasified fine slag mixture is a non-slurry material with a moisture content of 40% to 50%, a belt feeder or a scraper feeder is used for transportation.

[0099] Based on the system provided by the embodiment of the present invention, the gasification slag can be processed through the silo, drying and granulation device, screening device and combustion equipment to achieve resource utilization, reduction and harmless disposal of the gasification slag. The stirring device and arch-breaking slide arranged in the silo are conducive to ensuring uniform mixing of materials, and the materials do not bridge in the silo, so that the mixed materials can smoothly enter the next processing link. The gasification slag material formed by granulation can effectively enter the dense phase area of ​​the fluidized bed in the combustion equipment, prolonging the residence time of the gasification slag material in the dense phase area, which can strengthen the combustion of the gasification slag material, and the drying and granulation operation can improve the calorific value of the gasification slag material. At the same time, the dried particles contain a certain amount of moisture, and the carbon nucleus will also react with water during the incineration process, which is conducive to promoting stable combustion of materials and improving heat utilization.

[0100] The present invention also provides a method for incinerating coal gasification slag. Figure 4 As shown, the method provided by the embodiment of the present invention includes:

[0101] S401: Mixing the gasified fine slag and the gasified coarse slag to be disposed to obtain a coal gasification slag mixed material;

[0102] In the method provided in the embodiment of the present invention, during the treatment process of the coal gasification slag, the gasification fine slag to be treated and the gasification coarse slag can be mixed to obtain the coal gasification slag mixed material formed after the mixture. Specifically, the material mixing can be achieved through a silo or other material mixing device.

[0103] S402: Drying and granulating the coal gasification slag mixture to obtain a dry granulated material;

[0104] In the method provided in the embodiment of the present invention, the coal gasification slag mixture is dried based on a high temperature heat source, and the dried material is granulated, so that the material is processed into material particles of a certain shape and size, and the material obtained after the drying and granulation is used as a dry granulated material. Specifically, the coal gasification slag mixture can be transported to the drying and granulation device for drying and granulation by pumping or other material conveying methods.

[0105] S403: Screening the dried granulated material according to a preset particle size value to obtain a first screened material and a second screened material; the first screened material is a material whose particle size is larger than the preset particle size value, and the second screened material is a material whose particle size is not larger than the preset particle size value;

[0106] In the method provided in the embodiment of the present invention, the material particles in the dry granulated material can be screened by a corresponding screening device. The dry granulated material is separated based on a preset particle size value as a standard, and the material particles with a particle size greater than the preset particle size value are used as the first screening material, and the material particles with a particle size not greater than the preset particle size value are used as the second screening material.

[0107] S404: transporting the first screened material to a combustion device for incineration, and mixing the second screened material with the material to be disposed of.

[0108] In the method provided in the embodiment of the present invention, the first screened material is sent to the combustion equipment for mixed combustion to achieve the disposal of the coal gasification slag. The second screened material is mixed with the coal gasification slag to be disposed of to re-dry the material, granulate it, and so on.

[0109] Based on the method provided in the embodiment of the present invention, in the process of disposing the coal gasification slag, the coarse gasification slag and the fine gasification slag are first mixed to obtain a coal gasification slag mixed material. The coal gasification slag mixed material is dried and granulated, and the dried and granulated material is screened. The material that meets the requirements is sent to the combustion equipment for combustion, and the material that does not meet the requirements can be mixed with the material to be disposed of and reprocessed. The method provided in the embodiment of the present invention is applied, by mixing the fine gasification slag and the coarse gasification slag, the mixed material is dried and granulated, and the dry granulated material with a particle size of a certain size is put into the equipment for combustion. Since the water content of the coarse gasification slag is lower than that of the fine gasification slag, the water content of the fine gasification slag material can be reduced by mixing the two types of coal gasification slag, and the water content of the material can be further reduced by drying the mixed material, and the calorific value of the material can be increased, making the mixed material flammable. Since the particle size of the original coal gasification slag is usually at the micron level, the original coal gasification slag stays in the dense phase zone for a very short time after entering the boiler, making it difficult to achieve effective combustion of the coal gasification slag. The method provided in the embodiment of the present invention can increase the particle diameter of the material by granulating the mixed material, thereby increasing the residence time of the material in the dense phase zone during the combustion process, thereby enabling the incinerated material to burn stably, which is beneficial to improving the combustion efficiency and resource utilization of the coal gasification slag.

[0110] It should be noted that the disposal method adopted by the coal gasification slag incineration method provided in the embodiment of the present invention is similar to the disposal method implemented by the coal gasification slag incineration system provided in the previous embodiment. Therefore, the description of the method embodiment is relatively simple. For the implementation of the disposal method, please refer to the description in the previous embodiment.

[0111] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. A person of ordinary skill in the art may understand and implement it without creative work.

[0112] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal gasification slag incineration system, characterized in that: include: Silos, drying and granulating devices, screening devices, combustion equipment, air preheaters and tail gas treatment devices; The feed end of the silo is connected to a conveying device for coal gasification slag, and the discharge end of the silo is connected to a feed end of the drying and granulating device; the coal gasification slag includes fine gasification slag and coarse gasification slag; The discharge end of the drying and granulating device is connected to the feed end of the screening device, and the screening device is provided with a first discharge end and a second discharge end, the first discharge end is connected to the feed end of the combustion device, and the second discharge end is connected to the feed end of the silo; The flue gas discharge pipe of the combustion equipment is connected to the flue gas input end of the air preheater, and the flue gas output end of the air preheater is connected to the input end of the tail gas treatment device; The silo is used to mix the gasified fine slag and the gasified coarse slag fed into the silo to obtain a coal gasification slag mixed material, and transport the coal gasification slag mixed material to the drying and granulating device; The drying and granulating device is used to dry and granulate the coal gasification slag mixture to obtain dry granulated material, and transport the dry granulated material to the screening device; The screening device is used to screen the dry granulated material according to a preset particle size value to obtain a first screened material and a second screened material, and to convey the first screened material to the combustion device for incineration, and to convey the second screened material to the silo; the first screened material is a material whose particle size is larger than the preset particle size value, and the second screened material is a material whose particle size is not larger than the preset particle size value; The air preheater is used to perform heat recovery treatment on the flue gas discharged by the combustion equipment, and transport the flue gas after heat recovery treatment to the tail gas treatment device; The exhaust gas treatment device is used to perform exhaust gas purification on the flue gas that has undergone heat recovery treatment, and discharge the exhaust gas that has undergone exhaust gas purification into the atmosphere.

2. The coal gasification slag incineration system according to claim 1, characterized in that: The drying medium of the drying and granulating device is the flue gas discharged by the combustion equipment.

3. The coal gasification slag incineration system according to claim 2, characterized in that: Also includes: A first condenser, wherein the input end of the first condenser is connected to the tail gas discharge end of the drying and granulating device, and the output end of the first condenser is connected to the input end of the tail gas treatment device.

4. The coal gasification slag incineration system according to claim 1, characterized in that: The drying medium of the drying and granulating device is steam.

5. The coal gasification slag incineration system according to claim 4, characterized in that: Also includes: Dust removal device and second condenser; The input end of the dust removal device is connected to the tail gas discharge end of the drying and granulating device, the output end of the dust removal device is connected to the input end of the second condenser, and the output end of the second condenser is connected to the atmosphere.

6. The coal gasification slag incineration system according to claim 1, characterized in that: The tail gas treatment device includes a dust collector and a desulfurization tower; The input end of the dust collector is the input end of the tail gas treatment device, and the output end of the dust collector is connected to the input end of the desulfurization tower.

7. The coal gasification slag incineration system according to claim 1, characterized in that: The silo is provided with a stirring device and an arch-breaking slide.

8. The coal gasification slag incineration system according to claim 1, characterized in that: The silo transports the coal gasification slag mixture to the drying and granulating device through a preset pumping pipeline system.

9. The coal gasification slag incineration system according to claim 1, characterized in that: The silo conveys the coal gasification slag mixture to the drying and granulating device through a preset belt feeder or scraper feeder.

10. A method for incinerating coal gasification slag, characterized in that: include: Mixing the gasification fine slag to be disposed with the gasification coarse slag to obtain a coal gasification slag mixed material; Drying and granulating the coal gasification slag mixture to obtain a dry granulated material; The dried granulated material is screened according to a preset particle size value to obtain a first screened material and a second screened material; the first screened material is a material whose particle size is larger than the preset particle size value, and the second screened material is a material whose particle size is not larger than the preset particle size value; The first screened material is transported to a combustion device for incineration, and the second screened material is mixed with the material to be disposed of.

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