CN215638687U - System for retrieve moisture in fine coal preparation unit - Google Patents
System for retrieve moisture in fine coal preparation unit Download PDFInfo
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- CN215638687U CN215638687U CN202121107976.0U CN202121107976U CN215638687U CN 215638687 U CN215638687 U CN 215638687U CN 202121107976 U CN202121107976 U CN 202121107976U CN 215638687 U CN215638687 U CN 215638687U
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Abstract
The utility model discloses a system for recovering moisture in a pulverized coal preparation unit, which comprises a pulverized coal preparation component and a steam condensation recovery component, wherein the pulverized coal preparation component comprises a pulverized coal bunker, a coal feeder, a coal pulverizer, a pulverized coal collector, a circulating fan and a hot blast stove; according to the utility model, most of steam in the circulating gas of the pulverized coal preparation unit is condensed and recovered by the condenser, and under the condition of maintaining the pressure of the system unchanged, only a small amount of exhausted gas is required to adjust the pressure and the oxygen content of the system, so that the system emptying is reduced to a great extent, the circulating amount of inert gas is increased, on one hand, a large amount of water resources in raw coal can be recovered, on the other hand, the nitrogen supplement amount of the system is reduced, a large amount of nitrogen is saved, and cost reduction and efficiency improvement are realized.
Description
Technical Field
The utility model relates to the technical field of pulverized coal preparation, in particular to a system for recovering water in a pulverized coal preparation unit.
Background
In the shell dry method pulverized coal pressure gasification, the water content of pulverized coal entering a gasification furnace is required to be less than or equal to 2 percent, the water content of pulverized coal is required to be less than or equal to 4 percent in direct coal liquefaction, and the water content of raw coal used for shell gasification and clean coal used for direct liquefaction is about 14 percent and 17 percent, so a pulverized coal preparation unit is required to finish grinding and drying of the raw coal; in the existing shell powder coal pressure gasification process and the coal direct liquefaction process, moisture in raw coal of a powder coal preparation unit is directly discharged to the atmosphere along with exhaust gas, and the moisture contained in the coal is not recycled, so that the serious waste of water resources is caused. The water is recovered from the raw coal, so that the problem of water resource shortage of a chemical plant can be solved, and the contradiction between waste gas of the chemical plant and local environmental protection and ecological balance can be relieved; secondly, nitrogen is required to be continuously supplemented in the whole circulating gas for preparing the pulverized coal to adjust the oxygen content of the system, so that the nitrogen is large in use amount and high in economic cost.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a system for recovering water in a pulverized coal preparation unit.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for recovering moisture in a pulverized coal preparation unit comprises a pulverized coal preparation component and a steam condensation recovery component;
the pulverized coal preparation component comprises a pulverized coal bunker, a coal feeder, a coal mill, a pulverized coal collector, a circulating fan and a hot blast stove;
the condensation recovery assembly comprises a first condenser, a second condenser and a condensate tank;
the coal crushing bin, the coal feeder and the coal mill are sequentially communicated, a discharge hole of the coal mill is communicated with a feed hole of the coal dust collector, a gas outlet of the coal dust collector is communicated with a gas inlet of the circulating fan, a gas outlet of the circulating fan is communicated with the hot blast stove, and the hot blast stove is used for conveying hot inert gas into the coal mill;
the first condenser is provided with a plurality of openings, the circulating fan is communicated with one opening of the first condenser, the other opening of the first condenser is communicated with the hot blast stove, the bottom of the first condenser is provided with a liquid collecting chamber, the bottom of the liquid collecting chamber of the first condenser is provided with a liquid level control valve, and the bottom of the liquid collecting chamber of the first condenser is communicated with the condensate tank.
Further, the circulating fan is communicated with the second condenser through a pipeline and a regulating valve.
Furthermore, a liquid collection chamber is formed in the bottom of the second condenser, and a liquid level control valve is arranged at the bottom of the liquid collection chamber of the second condenser.
Further, the liquid collecting chamber of the second condenser is communicated with the condensed liquid tank.
Furthermore, the second condenser is provided with an exhaust gas outlet.
Compared with the prior art, the utility model has the beneficial effects that:
in the using process, the inert circulating gas at the outlet of the pulverized coal collector is condensed by the first condenser, the exhaust gas is condensed by the second condenser, the condensed water is uniformly collected and treated, a large amount of water resources are recovered, and meanwhile, the condensed circulating gas is more beneficial to drying the pulverized coal when entering the pulverized coal collector again;
the utility model condenses most steam in the circulating gas of the coal preparation system by using the condenser, and only needs a little exhaust gas to adjust the pressure and the oxygen content of the system under the condition of keeping the pressure of the system unchanged, thereby reducing the system exhaust to a great extent and increasing the circulating amount of the inert gas, thereby greatly reducing the nitrogen supplement amount of the system and realizing cost reduction and efficiency improvement.
Drawings
FIG. 1 is a general schematic view of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
Example 1:
a system for recovering water in a pulverized coal preparation unit comprises a pulverized coal preparation component 1 and a steam condensation recovery component 2;
the pulverized coal preparation assembly 1 comprises a pulverized coal bunker 11, a coal feeder 12, a coal mill 13, a pulverized coal collector 14, a circulating fan 15 and a hot blast stove 16.
The vapor condensation recovery assembly 2 includes a first condenser 21, a second condenser 22, and a condensate tank 23.
The coal crushing bin 11, the coal feeder 12 and the coal mill 13 are sequentially communicated, a discharge hole of the coal mill 13 is communicated with a feed hole of a coal dust collector 14, a gas outlet of the coal dust collector 14 is communicated with a gas inlet of a circulating fan 15, a gas outlet of the circulating fan 15 is communicated with a hot blast stove 16, and the hot blast stove 16 is used for conveying hot inert gas into the coal mill 13.
As shown in fig. 1, in the specific implementation, the crushed coal enters the crushed coal bin 11 for short storage, and then enters the coal feeder 12, the crushed coal is weighed and then conveyed to the coal mill 13, the coal mill 13 is internally provided with a grinding roller and a grinding disc, the crushed coal is ground into coal powder under the action of the compaction forces of two grinding components of the grinding roller and the grinding disc, the coal powder is thrown out due to the rotation of the grinding disc, and the coal powder is dried by hot inert gas from the hot blast stove 16 and is brought into the rotary separator.
The fuel of the hot blast stove 16 is fuel gas from a pipe network, and combustion-supporting air is provided by a combustion-supporting fan. The fuel gas and the combustion air are mixed by the proportioner and then fed into the hot blast stove 16 through a fuel gas pipeline and a combustion air pipeline respectively. The fuel gas enters a burner of the hot blast stove to be mixed with air in the hot blast stove to generate hot gas, the hot gas is mixed with the circulating gas returned by the circulating fan 15 in the hot blast stove, the temperature of the mixed gas is regulated and controlled below 300 ℃, the mixed gas becomes hot inert gas with the oxygen content lower than 8 percent, and the hot inert gas is sent to a coal mill 13 to be used as a drying heat source and a conveying medium of the coal powder.
After separation by the cyclone separator, unqualified coarse coal powder returns to the grinding area for regrinding, qualified coal powder is taken out of the mill by hot inert gas and is sent to the inside of the coal powder collector 14 through a pipeline, hot gas containing the coal powder enters the coal powder collector 14, the hot gas filtered by a filter bag in the coal powder collector 14 enters the circulating fan 15 through a pipeline at an air outlet, and the filtered coal powder falls into a hopper at the lower part of the coal powder collector 14 for short-time storage and then is conveyed to a coal powder storage tank.
The first condenser 21 is provided with a plurality of openings, the circulating fan 15 is communicated with one opening of the first condenser 21, the other opening of the first condenser 21 is communicated with the hot blast stove 16, the bottom of the first condenser 21 is provided with a liquid collecting chamber, the bottom of the liquid collecting chamber of the first condenser 21 is provided with a liquid level control valve, and the bottom of the liquid collecting chamber of the first condenser 21 is communicated with the condensate tank 23.
As shown in fig. 1, in specific implementation, the circulating inert gas from the circulating fan 15 enters the first condenser 21 through a pipeline for condensation, so as to reduce the water content in the circulating inert gas, then the gas returns to the inside of the hot blast stove 16, so as to realize gas circulation, the condensate in the condenser flows to the bottom liquid collecting chamber, a fixed condensate liquid level is set in the liquid collecting chamber, so as to prevent the gas from being sucked backwards, and the obtained condensate is sent to the condensate tank 23 through a pipeline.
The circulating fan 15 is communicated with the second condenser 22 through a pipeline and a regulating valve, a liquid collecting chamber is formed in the bottom of the second condenser 22, a liquid level control valve is arranged at the bottom of the liquid collecting chamber of the second condenser 22, the liquid collecting chamber of the second condenser 22 is communicated with a condensate tank 23, and a waste gas outlet is formed in the second condenser 22.
In order to stabilize the system pressure, the waste gas is controlled by the regulating valve to enter the second condenser 22 for condensation, the condensate flows to the liquid collecting chamber of the second condenser 22 to establish liquid level and is sent to the condensate tank 23 by a pipeline, the liquid level is controlled by the liquid level control valve at the bottom of the liquid collecting chamber of the second condenser 22, the valve position opening degree and the liquid level of the liquid collecting chamber are interlocked, so that the circulating gas can be prevented from entering the condensate tank 23 when the liquid level of the liquid collecting chamber is empty, when no condensate exists during the system operation, the liquid level control valve is in a closed state, the waste gas after cooling and cooling can be directly discharged from a gas outlet of the condenser, after the device is stably operated, the regulating valve only needs to be opened to be a small opening degree to keep the system pressure stable, therefore, only a small amount of waste gas is discharged to the air by the whole coal powder preparation unit, a large amount of water resources in raw coal are recycled, and the nitrogen supplement amount in the circulating gas is reduced, a large amount of nitrogen is saved;
the condenser type in the steam condenser component is not limited to various heat exchangers such as plate type heat exchangers and tube type heat exchangers, and is not limited to whether a liquid collecting chamber is arranged at the bottom of the condenser or not.
In the gasification of the shell plate pulverized coal with the single coal feeding amount of 2000t/d, two coal mills are matched for single gasification, the rated load of a single coal mill is 46.5t/h, the water content of raw coal entering the coal mill is 14 percent, the water content of required dry pulverized coal is 2 percent, and simple material balance calculation is carried out on the water content of the raw coal per hour.
Inlet raw coal carries moisture: 46.5X 0.14 ═ 6.51t
Moisture in the dried coal powder: 6.51-0.78 ═ 5.73t
Drying the removed water:
namely, the moisture in the raw coal of 5.73t per hour is dried and removed by a single coal mill.
At the same time, the combustion of the fuel gas in the hot blast stove 16 also produces moisture. The fuel gas feeding amount of the hot blast stove is 500Nm3/h, the density is about 2.86kg/m3 when the pressure is 0.4MPa, and the natural gas is 1430 kg.
CH4+2O2＝CO2+2H2O
16 36
1430kg x
The sum of the water in the two parts is the total water in the exhausted air exhausted by a single coal grinding system, and the total water is about 8.95 t/h.
In a certain coal chemical engineering project, six coal mills are provided, five coal mills are provided, the load of each coal mill is 51.2t/h, the water content of fed clean coal is 4% after the coal is ground and dried, and simple material balance is carried out on the water;
inlet raw coal carries moisture: 51.2X 0.17 ≈ 8.7t
Moisture in the dried coal powder: 8.7-1.63 ═ 7.07t
Drying the removed water:
namely, the moisture in the raw coal of 5.73t per hour is dried and removed by a single coal mill.
Meanwhile, the moisture is also generated by the combustion of the fuel gas in the hot blast stove, the fuel gas feeding is about 500Nm3/h, so the moisture generated by the fuel gas of a single set system is 3.22 t/h.
Therefore, the total amount of water in the exhausted air discharged by the single set of coal grinding system of the coal preparation unit in the project is 10.29t/h of the sum of the two parts.
Through simple material balance, the above result can be obtained, when the project is operated, nine sets of coal preparation systems are operated totally, and the water discharged to the atmosphere totally is: 10.29 x 5+8.95 x 4 ═ 87.25t/h, if this part of water can be collected, 2094 tons of water can be saved per day. Through the application of the technology, most of the water discharged from the water tank is recovered, so that the technology has great economic benefit and environmental benefit, and simultaneously, the water consumption of coal chemical engineering projects is reduced to a great extent, so that the technology has a profound influence on the development of coal-to-oil coal chemical engineering projects in water resource-deficient areas.
In practice, 5000 Nm/hour supplement is needed for each set of system in order to control the oxygen content of the system when the coal preparation system is in operation3The nine sets of coal preparation systems require 5000 × 9 to 45000Nm3And when the system runs stably, the system is only slightly emptied, a large amount of nitrogen can be saved, and when the oxygen content of the system rises, the regulating valve 5 is slightly opened to regulate the oxygen content.
Although the material balance in this patent takes the coal preparation unit of the shell pulverized coal gasification and coal liquefaction project as an example, the application scope of this patent is not limited to this, and this patent can be applied to all pulverized coal preparation units in coal-to-liquid, coal chemical industry, thermal power generation and other industries which use pulverized coal as a raw material.
Example 2:
as shown in fig. 2, different from embodiment 1, only the first condenser 21 is provided in the system, the circulating gas is condensed by the first condenser, the condensed water is collected, the three-way exhaust gas is provided in the pipeline between the circulating fan 15 and the hot blast stove 16, the exhaust gas amount is adjusted by the adjusting valve, and the exhaust gas from the adjusting valve can be directly discharged to the atmosphere.
Example 3:
as shown in figure 3, different from the embodiments 1 and 2, only the second condenser 22 is arranged in the system, the circulating air at the outlet of the circulating fan 15 is directly sent to the hot blast stove 16, the middle pipeline is provided with a tee joint for exhausting the exhaust air, the exhaust air enters the second condenser 22 after passing through the regulating valve, and the exhaust air is directly discharged to the atmosphere from the outlet of the condenser after condensing and recovering moisture by the second condenser 22.
The above description is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to be covered by the appended claims.
Claims (5)
1. A system for recovering moisture in a pulverized coal preparation unit is characterized by comprising a pulverized coal preparation component (1) and a steam condensation recovery component (2);
the pulverized coal preparation assembly (1) comprises a pulverized coal bin (11), a coal feeder (12), a coal mill (13), a pulverized coal collector (14), a circulating fan (15) and a hot blast stove (16);
the steam condensation and recovery assembly (2) comprises a first condenser (21), a second condenser (22) and a condensate tank (23);
the coal crushing bin (11), the coal feeder (12) and the coal mill (13) are sequentially communicated, a discharge hole of the coal mill (13) is communicated with a feed hole of the coal powder collector (14), a gas outlet of the coal powder collector (14) is communicated with a gas inlet of the circulating fan (15), a gas outlet of the circulating fan (15) is communicated with the hot blast stove (16), and the hot blast stove (16) is used for conveying hot inert gas into the coal mill (13);
the air conditioner is characterized in that the first condenser (21) is provided with a plurality of openings, the circulating fan (15) is communicated with one opening of the first condenser (21), the other opening of the first condenser (21) is communicated with the hot blast stove (16), a liquid collecting chamber is formed in the bottom of the first condenser (21), a liquid level control valve is arranged at the bottom of the liquid collecting chamber of the first condenser (21), and the bottom of the liquid collecting chamber of the first condenser (21) is communicated with the condensed liquid tank (23).
2. A system for recovering moisture in a pulverized coal preparation unit in accordance with claim 1, characterized in that said circulating fan (15) is in communication with said second condenser (22) through a pipe and a regulating valve.
3. The system for recovering moisture in a pulverized coal preparation unit as claimed in claim 2, wherein a liquid collection chamber is opened at the bottom of the second condenser (22), and a liquid level control valve is arranged at the bottom of the liquid collection chamber of the second condenser (22).
4. A system for recovering moisture in a pulverized coal preparation unit in accordance with claim 3, characterized in that the liquid collection chamber of said second condenser (22) is in communication with said condensate tank (23).
5. The system for recovering moisture in a pulverized coal preparation unit as claimed in claim 4, characterized in that the second condenser (22) is provided with an exhaust gas outlet.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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