CN215327933U - System for improving characteristics of coal as fired in liquid slag tapping furnace by utilizing fly ash circulation - Google Patents
System for improving characteristics of coal as fired in liquid slag tapping furnace by utilizing fly ash circulation Download PDFInfo
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- CN215327933U CN215327933U CN202120402932.4U CN202120402932U CN215327933U CN 215327933 U CN215327933 U CN 215327933U CN 202120402932 U CN202120402932 U CN 202120402932U CN 215327933 U CN215327933 U CN 215327933U
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Abstract
The utility model relates to a system for improving the characteristics of coal as fired in a liquid slagging furnace by utilizing fly ash circulation, which comprises a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash and raw coal are linked, the fly ash returning device is connected with the fly ash collecting device, the fly ash conveying device presses fly ash from the fly ash collecting device to a coal grinding system in a pneumatic conveying mode, and the quantitative adding device synchronously controls the adding amount of the fly ash through the feeding linkage of the fly ash and the raw coal. The utility model is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slag tapping gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by a dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high ratio of fine particles to silicon and aluminum, so as to meet the coal index requirement for the gasifier, prevent the gasifier from slag collapse or slag blockage and realize long-period safe and stable operation.
Description
Technical Field
The utility model relates to the related field of coal chemical industry, in particular to a system for improving the characteristics of coal as fired in a liquid slag tapping furnace by utilizing fly ash circulation.
Background
The shell gasification furnace is a raw coal pressurized entrained flow bed gasification technology, adopts a structural mechanism of slag tapping and slag resistance, and has strict requirements on coal quality. Has certain range requirements for the moisture, ash content, ash melting point, ash slag viscosity-temperature characteristic and the like of coal. It is difficult to have a single coal in the market to meet these requirements. In actual production, two or more kinds of coal are blended by a coal blending process, or special modifiers are added to blend various indexes.
However, because of the limitation of the coal generation conditions, the coal types in one area generally have the same coal quality characteristics, and the two types of coal with complementary indexes are usually far apart, which invisibly increases the coal consumption cost of the gasification furnace. And the paired coals are influenced by production, transportation, market, policy and the like, so that the safe and stable supply cannot be fundamentally guaranteed, and the safety and stable production of enterprises is seriously checked.
In addition, the special modifier is generally composed of single or composite substances rich in metals, and needs to be processed in a single proportion, so that the cost is relatively high, and the production and operation pressure of enterprises is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of the prior art and provides a system for improving the characteristics of coal as fired in a liquid slag tapping furnace by utilizing fly ash circulation.
The technical scheme for solving the technical problems is as follows: the system for improving the characteristics of the coal as fired in the liquid-state slagging furnace by utilizing the fly ash circulation comprises a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash returning device is connected with the fly ash collecting device, the fly ash conveying device presses the fly ash from the fly ash collecting device to a coal grinding system in a pneumatic conveying mode, and the quantitative adding device synchronously controls the adding amount of the fly ash through the feeding linkage of the fly ash and raw coal.
The utility model has the beneficial effects that: the utility model is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slag tapping gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by a dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle-to-silica-alumina ratio, so as to meet the coal index requirement for the gasifier, prevent the gasifier from slag collapse or slag blockage and realize long-period stable operation.
The utility model recycles the fly ash generated by the gasification furnace, and the fly ash can be used as a viscosity-temperature modifier to be obtained locally, thereby not only realizing recycling of solid waste and reducing discharge, but also reducing outsourcing matched coal or high-cost modifiers and greatly reducing the coal blending cost.
Taking a shell gasification furnace as an example, the key control indexes of the coal as fired require as follows:
1. the water content Mt percent is less than or equal to 15; 2. 15.0-25.0% of ash content Aad%;
3. the volatile component Vdaf percent is less than or equal to 25; 4. fe in ash2O3The content percent is less than or equal to 12;
5. ash melting point FT 1350-; 6. st, ad% of sulfur is less than or equal to 3.0;
7. the viscosity temperature difference of ash slag is 2-25 Pa.s which is more than 180 (the ratio of silicon to aluminum is more than 1.8);
taking the lean coal in Shanxi as an example, the coal has the characteristics of low moisture, low ash content, high ash melting point, high heat value and poor viscosity-temperature characteristics of ash slag.
1. The water content Mt percent is less than or equal to 15; 2. ash content Aad% is less than or equal to 15;
3. 10-15% of volatile component Vdaf; 4. the content of Fe2O3 in the ash is less than or equal to 15 percent;
5. ash melting point FT > 1500; 6. sulfur St, ad% 0.3;
7. the viscosity temperature difference of the ash is 2-25Ps and is less than 180 (the ratio of silica to alumina is 1.2-1.6);
through long-term tracking observation, the gasified fly ash comprises the following components:
1. the water content Mt percent is less than or equal to 1; 2. ash content Aad% is more than or equal to 95; 3. the silicon-aluminum ratio is 2.4-2.7;
namely, the metals in the raw coal are aggregated and segregated in the gasification and discharge process, SiO2Enriched in fly ash, while Al2O3And CaO, MgO, and the like are enriched in the slag.
The fly ash composition is complementary with certain indexes in coal, can be mixed with the fly ash composition, and can adjust the ash content according to the indexes of the coal.
On the basis of the technical scheme, the utility model can be further improved as follows.
The quantitative feeding device comprises a fly ash collecting device and a fly ash discharging device, wherein the fly ash collecting device comprises a fly ash circulating pipeline and a fly ash discharging port, the fly ash discharging port is connected with a feeding port of the fly ash buffering bin through the fly ash circulating pipeline, and the fly ash discharging port is provided with a star-type feeder or a belt weighing machine.
The beneficial effect of adopting the further scheme is that: the fly ash buffer bin can be used for caching the mixed fly ash, and the star-shaped feeder at the bottom of the fly ash buffer bin is used for quantitative feeding.
Further, the device also comprises a PLC controller, wherein the PLC controller is in communication connection with the quantitative adding device and determines the addition amount of the fly ash by controlling the quantitative adding device.
The beneficial effect of adopting the further scheme is that: the automatic control of fly ash addition can be realized through a PLC controller. The fly ash is pneumatically conveyed into a fly ash buffer bin from a fly ash collecting device by taking gas (such as hot nitrogen) as a medium through a fly ash circulating pipeline, the pipeline can adopt a wear-resistant pipe, and the fly ash buffer bin is of an inflatable cone structure to prevent a fly ash bridge plate structure. The fly ash is quantitatively fed by the star-shaped feeder and is hermetically conveyed into a coal grinding system, and simultaneously, the addition amount of the fly ash is determined by controlling the rotating speed of the star-shaped feeder in a linkage manner through a PLC according to the flow rate of coal and the set ratio, so that the blending and mixing of the fly ash and raw coal are realized.
Further, the quantitative adding device comprises a speedometer, a flow regulating valve and a densimeter which are arranged on a fly ash circulating pipeline connected with a fly ash outlet of the fly ash collecting device.
The beneficial effect of adopting the further scheme is that: the fly ash addition amount can be effectively controlled by arranging a speedometer, a flow regulating valve and a densimeter.
The device further comprises a PLC (programmable logic controller), wherein the PLC is respectively connected with a speedometer, a densimeter and a flow regulating valve, the speedometer and the densimeter respectively collect the density and the speed of the fly ash on the fly ash circulating pipeline and send the density and the speed to the PLC, the PLC calculates and determines the flow of the fly ash according to the density and the speed of the fly ash, controls the opening of the flow regulating valve according to the preset ratio according to the flow of raw coal, and regulates the ratio of the fly ash and the raw coal.
The beneficial effect of adopting the further scheme is that: the automatic control of the fly ash adding proportion can be realized through a PLC controller. The fly ash is discharged from the fly ash collecting device, the fly ash is switched by a three-way valve, gas (such as hot nitrogen) is used as a medium and is pneumatically conveyed to the inlet of a coal grinding system through a fly ash circulating pipeline, the flow of the fly ash is calculated and determined by a PLC controller through a flow regulating valve, a density meter and a speedometer which are arranged on the pipeline and through density and speed signals collected by the density meter and the speedometer, and meanwhile, the flow regulating valve is linked according to the set ratio according to the flow of raw coal to regulate the ratio of the fly ash and the raw coal.
Furthermore, a temperature detection device and a pressure detection device are also arranged on a fly ash circulation pipeline connected with a fly ash outlet of the fly ash collection device. And respectively monitoring the temperature and the pressure of the fly ash circulation pipeline by using a temperature detection device and a pressure detection device.
Further, the device comprises a limestone supply device, wherein the limestone supply device comprises a limestone bin, and the limestone bin is connected with the coal pulverizer through a weighing feeder. The limestone supply device also comprises a limestone buffer bin and a bin pump, and the limestone buffer bin is connected with the limestone bin through the bin pump.
The beneficial effect of adopting the further scheme is that: fly ash can be added to the coal grinding system via the discharge port of the limestone silo.
Furthermore, a fly ash blower is arranged on a fly ash circulating pipeline connected with a fly ash outlet of the fly ash collecting device. The fly ash blower is connected with a gas conveying pipe network.
The beneficial effect of adopting the further scheme is that: the fly ash in the fly ash circulating pipeline can be pneumatically conveyed to a fly ash buffer bin or an inlet of a coal grinding system by using the fly ash blower.
Furthermore, the fly ash amount sent into the coal grinding system by the fly ash collecting device is 5-15% of the weight of the raw coal.
Of course, besides adding fly ash, other modifiers for improving the viscosity-temperature characteristic of the coal ash can be mixed and added into the coal grinding system, so that the viscosity-temperature characteristic can be controlled conveniently, and other indexes such as ash content, ash fusibility and the like of the mixed coal can be adjusted better.
Of course, besides fly ash and other viscosity-temperature characteristics modifier, limestone can be added as flux in the coal grinding system as required, and the addition amount of limestone is controlled to control the ash melting point of the mixed coal within a control range. For example, the weight ratio of the Shanxi coal, the fly ash and the limestone is set to be 100:10:3, so that the obtained coal as fired has better viscosity-temperature property and ash meltability.
The beneficial effect of adopting the further scheme is that: by adopting the fly ash adding proportion, the silicon oxide enriched in the fly ash can be fully utilized, the using amount of an outsourcing high-price modifier is reduced, the raw material cost is reduced, and the reutilization of production waste is improved. The fly ash of 10-15% is added into raw coal, the coal silicon-aluminum ratio of 12% ash content can be increased from 1.3 to 1.87, the ash content and silicon-aluminum ratio can meet the requirement, and the gasifier operation space Delta T (the temperature difference between the viscosity T2 and the viscosity T25) is enlarged from 150 to 220.
The method for improving the characteristics of the coal as fired in the liquid slag tapping furnace by utilizing the fly ash circulation comprises the following steps:
s1, filtering and collecting the fly ash generated by the gasification furnace by using a fly ash collecting device; the filtered synthesis gas is supplied to a user for use;
and S2, the fly ash enters the fly ash buffer bin through the fly ash circulation pipeline, and the fly ash is quantitatively conveyed to the coal grinding system through a star-shaped feeder or a weighing feeder at the discharge port of the fly ash buffer bin and is mixed with raw coal.
The utility model has the beneficial effects that: the utility model is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slag tapping gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by a dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle-to-silica-alumina ratio, so as to meet the coal index requirement for the gasifier, prevent the gasifier from slag collapse or slag blockage and realize long-period operation. The fly ash can be quantitatively conveyed into a coal grinding system by utilizing the fly ash buffer bin and the star-shaped feeder at the bottom of the fly ash buffer bin, so that the mixed raw coal meets the production requirement.
The method for improving the characteristics of the coal as fired in the liquid slag tapping furnace by utilizing the fly ash circulation comprises the following steps:
s1, collecting the fly ash generated by the gasification furnace by using a fly ash collecting device; the filtered synthesis gas is supplied to a user for use;
s2, the fly ash enters the coal grinding system through the fly ash circulation pipeline, the density and the speed of the fly ash on the fly ash circulation pipeline are respectively collected through a speedometer and a densimeter to determine the flow rate of the fly ash, and the opening of a flow regulating valve is controlled according to the flow rate of raw coal according to a preset ratio to regulate the ratio of the fly ash to the raw coal.
The utility model has the beneficial effects that: the utility model is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slag tapping gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by a dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle-to-silica-alumina ratio, so as to meet the coal index requirement for the gasifier, prevent the gasifier from slag collapse or slag blockage and realize long-period operation. The flow of the fly ash is adjusted by the flow adjusting valve, and the fly ash can be quantitatively conveyed to a coal grinding system, so that the mixed raw coal meets the production requirement.
Drawings
FIG. 1 is a schematic process flow diagram of an embodiment of a system for improving the properties of coal as fired in a liquid slagging furnace using fly ash recycling in accordance with the present invention;
FIG. 2 is a schematic process flow diagram of another embodiment of the system for improving the properties of coal as fired in a liquid slagging furnace using fly ash recycling according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a crushed coal bin; 2. weighing a coal feeder; 3. a coal pulverizer; 4. a fly ash storage tank; 5. a ceramic filter; 6. a fly ash lock hopper; 7. a fly ash filter; 8. a fly ash gas stripping tank; 9. a fly ash discharging tank; 10. a fly ash aeration bin; 11. a fly ash blower; 12. transporting the fly ash to an external warehouse; 13. a speedometer; 14. a densitometer; 15. a flow regulating valve; 16. a thermometer; 17. a pressure gauge; 18. a fly ash surge bin; 19. a star-shaped feeder; 20. a limestone buffer bin; 21. a bin pump A; 22. a bin pump B; 23. a limestone bin; 24. a weighing feeder.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
Example 1
The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation comprises a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash returning device is connected with the fly ash collecting device, the fly ash conveying device presses the fly ash from the fly ash collecting device to a coal grinding system in a pneumatic conveying mode, and the quantitative adding device synchronously controls the adding amount of the fly ash through the feeding linkage of the fly ash and raw coal. The gasification furnace is connected with the air inlet of the fly ash collecting device through a fly ash returning device through a pipeline, and the fly ash outlet of the fly ash collecting device is connected with the coal grinding system through a fly ash circulating pipeline.
As shown in fig. 1 and 2, the coal grinding system includes a pulverized coal bunker 1 and a coal pulverizer 3, the pulverized coal bunker 1 is connected with the coal pulverizer 3 through a weighing coal feeder 2, and a fly ash outlet of the fly ash collecting device is connected with the coal pulverizer 3 through a pipeline.
As shown in fig. 1 and 2, the fly ash collecting device of this embodiment includes a fly ash storage tank 4, a ceramic filter 5 is disposed in the fly ash storage tank 4, a discharge port of the fly ash storage tank 4 is communicated with a feed port of a fly ash lock bucket 6 through a pipeline, a discharge port of the fly ash lock bucket 6 is communicated with a feed port of a fly ash gas-stripping tank 8 through a pipeline, a discharge port of the fly ash gas-stripping tank 8 is communicated with a feed port of a fly ash discharge tank 9 through a pipeline, a discharge port of the fly ash discharge tank 9 is communicated with a feed port of a fly ash gas-flushing bunker 10 through a pipeline, the fly ash gas-flushing bunker 10 is communicated with a fly ash blower 11 through a pipeline, and the fly ash blower 11 receives hot nitrogen from a pipe network and blows fly ash into a fly ash external transportation bunker 12 and a fly ash circulation pipeline through a three-way valve. The fly ash lock hopper 6, the fly ash gas stripping tank 8, the fly ash discharging tank 9 and the fly ash outward transportation bin 12 are all connected with a fly ash filter 7.
The embodiment is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slagging-off gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by the dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle ratio of silicon to aluminum, so that the coal index requirement for the gasifier is met, the gasifier is prevented from collapsing slag or blocking slag, and long-period operation is realized. The embodiment recycles the fly ash generated by the gasification furnace, the fly ash can be used as a viscosity-temperature modifier to be obtained locally, so that solid waste recycling is realized, discharge is reduced, outsourcing matched coal or high-cost modifier is reduced, and the coal blending cost is greatly reduced.
Example 2
The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation comprises a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash returning device is connected with the fly ash collecting device, the fly ash conveying device presses the fly ash from the fly ash collecting device to a coal grinding system in a pneumatic conveying mode, and the quantitative adding device synchronously controls the adding amount of the fly ash through the feeding linkage of the fly ash and raw coal. The gasification furnace is connected with the air inlet of the fly ash collecting device through a fly ash returning device through a pipeline, and the fly ash outlet of the fly ash collecting device is connected with the coal grinding system through a fly ash circulating pipeline.
As shown in fig. 2, the system of this embodiment further includes a fly ash surge bin 18, the quantitative adding device includes a star-type feeder or a belt weighing machine, a fly ash outlet of the fly ash collecting device is connected to a feed inlet of the fly ash surge bin 18 through a fly ash circulation pipeline, a discharge outlet of the fly ash surge bin 18 is provided with a star-type feeder 19 or a belt weighing machine, and the star-type feeder 19 or the belt weighing machine is connected to the coal grinding system through a pipeline. The fly ash buffer bin can be used for caching the mixed fly ash, and a star-shaped feeder or a belt weighing machine at the bottom of the fly ash buffer bin is used for quantitative feeding.
The system of this embodiment, still include the PLC controller, the PLC controller with star feeder 19 communication connection and through the rotational speed of controlling star feeder 19 confirm the fly ash addition volume. Or the PLC is connected with the weighing feeder and determines the addition amount of the fly ash by controlling the weighing feeder. The automatic control of fly ash addition can be realized through a PLC controller. The fly ash is pneumatically conveyed from the fly ash collecting device to the fly ash surge bin 18 by using gas (such as hot nitrogen) as a medium through a pipeline, the pipeline can adopt a wear-resistant pipe, and the fly ash surge bin is of an inflatable cone structure so as to prevent the fly ash from building up a bridge plate structure. The fly ash is quantitatively fed by the star feeder 19 or the weighing feeder and is hermetically conveyed into a coal grinding system, and simultaneously the addition amount of the fly ash is determined by controlling the rotating speed of the star feeder 19 in a PLC (programmable logic controller) linkage manner according to the flow rate of coal and a set ratio, so that the blending and mixing of the fly ash and raw coal are realized.
The fly ash circulation pipeline connected to the fly ash outlet of the fly ash collecting device of this embodiment is provided with a fly ash blower 11. The fly ash blower 11 is connected to an inert gas supply. Such as hot nitrogen from a pipe network. The fly ash blower can be used for conveying fly ash in the pipeline to a fly ash buffer bin or an inlet of a coal grinding system in a pneumatic mode. The amount of the fly ash sent into the coal grinding system by the fly ash collecting device of the embodiment is 5-15% of the weight of the raw coal. By adopting the fly ash adding proportion, the silicon oxide enriched in the fly ash can be fully utilized, the using amount of outsourcing high-price modifier is reduced, the raw material cost is reduced, and the reutilization of production waste is improved.
As shown in fig. 2, the coal grinding system of the present embodiment includes a pulverized coal bunker 1 and a coal pulverizer 3, the pulverized coal bunker 1 is connected to the coal pulverizer 3 through a weighing coal feeder 2, and a fly ash outlet of the fly ash collecting device is connected to the coal pulverizer 3 through a pipeline.
As shown in fig. 2, the fly ash collecting device of this embodiment includes a fly ash storage tank 4, a ceramic filter 5 is disposed in the fly ash storage tank 4, a discharge port of the fly ash storage tank 4 is communicated with a feed port of a fly ash lock bucket 6 through a pipeline, a discharge port of the fly ash lock bucket 6 is communicated with a feed port of a fly ash gas-stripping tank 8 through a pipeline, a discharge port of the fly ash gas-stripping tank 8 is communicated with a feed port of a fly ash discharge tank 9 through a pipeline, a discharge port of the fly ash discharge tank 9 is communicated with a feed port of a fly ash gas-flushing bunker 10 through a pipeline, the fly ash gas-flushing bunker 10 is communicated with a fly ash blower 11 through a pipeline, and the fly ash blower 11 receives hot nitrogen from a pipe network and blows the fly ash into a fly ash outward transportation bunker 12 and a fly ash circulation pipeline through a three-way valve. The fly ash lock hopper 6, the fly ash gas stripping tank 8, the fly ash discharging tank 9 and the fly ash outward transportation bin 12 are all connected with a fly ash filter 7.
The method for improving the characteristics of the coal as fired in the liquid slag tapping furnace by utilizing the fly ash circulation comprises the following steps:
s1, filtering and collecting the fly ash generated by the gasification furnace by using a fly ash collecting device; the filtered synthesis gas is supplied to a user for use; specifically, synthesis gas from upstream is filtered by a ceramic filter 5 in a fly ash storage tank 4, then is delivered to a customer, is filtered by a fly ash filter 7 and then enters a fly ash lock hopper 6, is filtered and then enters a fly ash gas stripping tank 8, then sequentially passes through a fly ash discharge tank 9 and a fly ash gas flushing bin 10, and is blown into a fly ash outward transportation bin 12 and a fly ash circulation pipeline by a fly ash blower 11.
S2, the fly ash enters the fly ash buffer bin 18 through the fly ash circulation pipeline, and the fly ash is quantitatively conveyed to the coal grinding system through the star feeder 19 or the weighing feeder at the discharge port of the fly ash buffer bin 18 to be mixed with raw coal.
The embodiment is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slagging-off gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by the dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle ratio of silicon to aluminum, so that the coal index requirement for the gasifier is met, the gasifier is prevented from collapsing slag or blocking slag, and long-period operation is realized.
The embodiment recycles the fly ash generated by the gasification furnace, the fly ash can be used as a viscosity-temperature modifier to be obtained locally, so that solid waste recycling is realized, discharge is reduced, outsourcing matched coal or high-cost modifier is reduced, and the coal blending cost is greatly reduced.
Example 3
The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation comprises a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash returning device is connected with the fly ash collecting device, the fly ash conveying device presses the fly ash from the fly ash collecting device to a coal grinding system in a pneumatic conveying mode, and the quantitative adding device synchronously controls the adding amount of the fly ash through the feeding linkage of the fly ash and raw coal. The gasification furnace is connected with the air inlet of the fly ash collecting device through a fly ash returning device through a pipeline, and the fly ash outlet of the fly ash collecting device is connected with the coal grinding system through a fly ash circulating pipeline.
As shown in fig. 1, the quantitative adding device of the present embodiment includes a speedometer, a flow rate regulating valve, and a densimeter. And a speed meter 13, a flow regulating valve 15 and a density meter 14 are arranged on a fly ash circulating pipeline between a fly ash outlet of the fly ash collecting device and the coal grinding system. The fly ash addition amount can be effectively controlled by arranging a speedometer, a flow regulating valve and a densimeter.
As shown in fig. 1, the present embodiment further includes a PLC controller, the PLC controller is respectively connected to the speedometer 13, the densimeter 14 and the flow regulating valve 15, the speedometer 13 and the densimeter 14 respectively collect the density and the speed of the fly ash on the fly ash circulation pipeline and send the density and the speed to the PLC controller, the PLC controller calculates and determines the flow rate of the fly ash according to the density and the speed of the fly ash, and controls the opening of the flow regulating valve according to the raw coal flow rate and the predetermined ratio. Adjusting the proportion of fly ash and raw coal. A temperature meter 16 and a pressure meter 17 are also arranged on a pipeline between the fly ash outlet of the fly ash collecting device and the coal grinding system. The automatic control of the fly ash adding proportion can be realized through a PLC controller. The fly ash is discharged from the fly ash collecting device, the fly ash is switched by a three-way valve, gas (such as hot nitrogen) is used as a medium and is pneumatically conveyed to the inlet of a coal grinding system through a pipeline, the flow of the fly ash is calculated and determined by a PLC controller through a flow regulating valve 15, a density meter 14 and a speedometer 13 which are arranged on the pipeline and through density and speed signals collected by the density meter 14 and the speedometer 13, and meanwhile, the ratio of the fly ash and raw coal is regulated according to the flow of the raw coal and the flow regulating valve which is linked according to the set ratio.
The fly ash circulation pipeline connected to the fly ash outlet of the fly ash collecting device of this embodiment is provided with a fly ash blower 11. The fly ash blower 11 is connected to an inert gas supply. Such as hot nitrogen from a pipe network. The fly ash blower can be used for conveying fly ash in the pipeline to a fly ash buffer bin or an inlet of a coal grinding system in a pneumatic mode.
The amount of the fly ash sent into the coal grinding system by the fly ash collecting device of the embodiment is 5-15% of the weight of the raw coal. By adopting the fly ash adding proportion, the silicon oxide enriched in the fly ash can be fully utilized, the using amount of outsourcing high-price modifier is reduced, the raw material cost is reduced, and the reutilization of production waste is improved.
As shown in fig. 1, the coal grinding system of the present embodiment includes a pulverized coal bunker 1 and a coal pulverizer 3, the pulverized coal bunker 1 is connected to the coal pulverizer 3 through a weighing coal feeder 2, and a fly ash outlet of the fly ash collecting device is connected to the coal pulverizer 3 through a pipeline.
As shown in fig. 1, the fly ash collecting device of this embodiment includes a fly ash storage tank 4, a ceramic filter 5 is disposed in the fly ash storage tank 4, a discharge port of the fly ash storage tank 4 is communicated with a feed port of a fly ash lock bucket 6 through a pipeline, a discharge port of the fly ash lock bucket 6 is communicated with a feed port of a fly ash gas-stripping tank 8 through a pipeline, a discharge port of the fly ash gas-stripping tank 8 is communicated with a feed port of a fly ash discharge tank 9 through a pipeline, a discharge port of the fly ash discharge tank 9 is communicated with a feed port of a fly ash gas-flushing bunker 10 through a pipeline, the fly ash gas-flushing bunker 10 is communicated with a fly ash blower 11 through a pipeline, and the fly ash blower 11 receives hot nitrogen from a pipe network and blows the fly ash into a fly ash outward transportation bunker 12 and a fly ash circulation pipeline through a three-way valve. The fly ash lock hopper 6, the fly ash gas stripping tank 8, the fly ash discharging tank 9 and the fly ash outward transportation bin 12 are all connected with a fly ash filter 7.
The method for improving the characteristics of the coal as fired in the liquid slag tapping furnace by utilizing the fly ash circulation comprises the following steps:
s1, filtering and collecting the fly ash generated by the gasification furnace by using a fly ash collecting device; the filtered synthesis gas is supplied to a user for use; specifically, synthesis gas from upstream is filtered by a ceramic filter 5 in a fly ash storage tank 4, then is delivered to a customer, is filtered by a fly ash filter 7 and then enters a fly ash lock hopper 6, is filtered and then enters a fly ash gas stripping tank 8, then sequentially passes through a fly ash discharge tank 9 and a fly ash gas flushing bin 10, and is blown into a fly ash outward transportation bin 12 and a fly ash circulation pipeline by a fly ash blower 11.
S2, the fly ash enters the coal grinding system through the fly ash circulation pipeline, the density and the speed of the fly ash on the fly ash circulation pipeline are respectively collected through the speedometer 13 and the densimeter 14 to determine the flow rate of the fly ash, and meanwhile, the opening degree of the flow regulating valve 15 is controlled according to the flow rate of raw coal according to a preset ratio to regulate the ratio of the fly ash to the raw coal.
The embodiment is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slagging-off gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by the dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle ratio of silicon to aluminum, so that the coal index requirement for the gasifier is met, the gasifier is prevented from collapsing slag or blocking slag, and long-period operation is realized. The embodiment recycles the fly ash generated by the gasification furnace, the fly ash can be used as a viscosity-temperature modifier to be obtained locally, so that solid waste recycling is realized, discharge is reduced, outsourcing matched coal or high-cost modifier is reduced, and the coal blending cost is greatly reduced.
Example 4
The system for improving the properties of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to the present embodiment can comprise any one of the embodiments 1 to 3, and further comprises a limestone supply device based on the above-mentioned embodiments, wherein the limestone supply device comprises a limestone bin 23, and the limestone bin 23 is connected with the coal pulverizer 3 through a weighing feeder 24. Specifically, limestone comes from a tank truck and is conveyed to a limestone buffer bin 20, and the limestone buffer bin 20 is respectively connected with a limestone bin 23 through a bin pump A21 and a bin pump B22, so that fly ash can be added into a coal grinding system through a blanking port of the limestone bin.
The embodiment is suitable for improving coal with low coal ash content and poor viscosity-temperature characteristic for the slagging-off gasifier in the field of coal chemical industry, and the fly ash (fine-particle fly ash) discharged by the dry ash removal system is conveyed and blended into raw coal by utilizing the characteristic of high particle ratio of silicon to aluminum, so that the coal index requirement for the gasifier is met, the gasifier is prevented from collapsing slag or blocking slag, and long-period operation is realized. The embodiment recycles the fly ash generated by the gasification furnace, the fly ash can be used as a viscosity-temperature modifier to be obtained locally, so that solid waste recycling is realized, discharge is reduced, outsourcing matched coal or high-cost modifier is reduced, and the coal blending cost is greatly reduced.
Example 5
In this example, the addition ratio of fly ash will be described based on examples 2 to 4.
The first implementation mode comprises the following steps: the fly ash collecting device of the embodiment feeds fly ash into the coal grinding system in an amount of 5% by weight of raw coal. Besides fly ash, other viscosity-temperature characteristic modifiers (rich in silicon, potassium, sodium and the like) are also added. The proportion of the gasified fly ash and other modifiers can be freely adjusted. .
The second embodiment: the fly ash collecting device of the embodiment feeds the fly ash into the coal grinding system in an amount of 15% of the weight of raw coal. In addition to fly ash, limestone may be added as needed. Raw coal: gasification of fly ash: the weight ratio of limestone is 100:15: 3.
In the embodiment of the present embodiment, the viscosity-temperature property of the coal for gasification to which the gasification fly ash is added is effectively improved.
In the detection of the gasified raw material coal, the discharged slag, the fly ash and the filter cake, the silicon, the aluminum, the calcium and the like in the coal are gasified in the gasification furnace to present obvious separation and aggregation effects. Wherein the alumina and calcia magnesia are enriched in the slag and the silica is enriched in the fly ash. Although the calcium oxide content in the slag is higher than that of the fly ash and the filter cake, the fluxing effect is very little, the silicon-aluminum ratio is smaller than that of a target product, the regulation effect of the added slag on the silicon-aluminum ratio is weaker, and the increased ash content can cause the energy consumption of the gasification furnace to be increased. The calcium oxide content and the silica-alumina ratio of the filter cake are not high, the blending use effect of the filter cake as a coal modifier is not large, the water content is high, the filter cake needs to be dried, and the blending cost is high. However, because of high carbon content, most domestic enterprises utilize the heat value of the coal and blend the coal into the coal for use, thereby improving the carbon conversion rate. Through comprehensive comparison, the fly ash is considered to be blended to the maximum extent, the using amount of outsourcing high-price modifier can be reduced, the raw material cost is reduced, and the reutilization of production waste is improved.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The system for improving the properties of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation is characterized by comprising a fly ash returning device, a quantitative adding device and a fly ash collecting device, wherein the fly ash and raw coal are linked; the quantitative adding device comprises a speedometer, a flow regulating valve and a densimeter which are arranged on a fly ash circulating pipeline connected with a fly ash outlet of the fly ash collecting device.
2. The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to claim 1, further comprising a fly ash surge bin, wherein the quantitative adding device comprises a star-shaped feeder or a belt weighing machine, a fly ash outlet of the fly ash collecting device is connected with a feed inlet of the fly ash surge bin through a fly ash circulation pipeline, and a discharge outlet of the fly ash surge bin is provided with the star-shaped feeder or the belt weighing machine.
3. The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to claim 1 or 2, further comprising a PLC controller, wherein the PLC controller is in communication connection with the quantitative adding device and determines the addition amount of the fly ash by controlling the quantitative adding device.
4. The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to claim 1, further comprising a PLC (programmable logic controller), wherein the PLC is respectively connected with a speedometer, a densimeter and a flow regulating valve, the speedometer and the densimeter respectively collect the density and the speed of the fly ash on the fly ash circulation pipeline and send the density and the speed to the PLC, the PLC calculates and determines the flow rate of the fly ash according to the density and the speed of the fly ash, and controls the opening degree of the flow regulating valve according to the preset ratio according to the flow rate of raw coal to regulate the ratio of the fly ash and the raw coal.
5. The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to claim 1, wherein a temperature detection device and a pressure detection device are further arranged on the fly ash circulation pipeline connected with the fly ash outlet of the fly ash collection device.
6. The system for improving characteristics of coal as fired in a liquid slagging furnace using fly ash circulation according to claim 1, further comprising a limestone supply device comprising a limestone silo connected with the coal grinding system through a weigh feeder.
7. The system for improving characteristics of coal as fired in a liquid slagging furnace according to claim 6, wherein the limestone supply apparatus further comprises a limestone buffer bin and a bin pump, the limestone buffer bin being connected to the limestone bin through the bin pump.
8. The system for improving the characteristics of the coal as fired in the liquid slagging furnace by utilizing the fly ash circulation according to claim 1, wherein a fly ash blower is arranged on a fly ash circulation pipeline connected with a fly ash outlet of the fly ash collecting device.
9. The system for improving characteristics of coal as fired in a liquid slagging furnace using fly ash circulation according to claim 8, wherein the fly ash blower is connected to a gas delivery pipe network.
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| CN202120402932.4U CN215327933U (en) | 2021-02-23 | 2021-02-23 | System for improving characteristics of coal as fired in liquid slag tapping furnace by utilizing fly ash circulation |
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| CN202120402932.4U CN215327933U (en) | 2021-02-23 | 2021-02-23 | System for improving characteristics of coal as fired in liquid slag tapping furnace by utilizing fly ash circulation |
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