CN215855937U - Coal slurry grinding device - Google Patents
Coal slurry grinding device Download PDFInfo
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- CN215855937U CN215855937U CN202122404699.6U CN202122404699U CN215855937U CN 215855937 U CN215855937 U CN 215855937U CN 202122404699 U CN202122404699 U CN 202122404699U CN 215855937 U CN215855937 U CN 215855937U
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Abstract
The utility model discloses a coal slurry grinding device which comprises a coal mill and a coal slurry tank and is characterized by further comprising a coal slurry concentration pump, wherein a coal slurry outlet at the bottom of the coal slurry tank is connected with the coal slurry concentration pump, two branch pipes which are connected in parallel are arranged at the downstream of the coal slurry concentration pump, one concentration pipe is connected to a feed port of the coal mill, and one return pipe is connected to a coal slurry inlet at the top of the coal slurry tank. According to the coal slurry grinding device, the proportion of raw material coal at the inlet of the coal mill is changed through the arrangement of the coal slurry concentration pump and the concentration pipe, the retention time in the coal mill is prolonged, the coal slurry concentration is effectively improved through secondary grinding, and the stable operation of a coal grinding system is ensured.
Description
Technical Field
The utility model belongs to the technical field of coal gasification, and particularly relates to a coal slurry grinding device.
Background
In the coal gasification technology, a coal slurry preparation system is used for adding raw coal from a coal storage and transportation system into a coal hopper, feeding coal blocks in the coal hopper into a coal mill through a belt coal feeder, grinding the raw coal, water and an additive in the coal mill to prepare coal water slurry with qualified quality, and providing qualified raw materials for a gasification process. The stability of the coal grinding system and the control of the coal slurry concentration are the source and guarantee of the whole production. Coal slurries play a crucial role in production plants.
At present, raw materials produced by coal grinding of a coal slurry system are coal, the raw materials enter a coal grinding machine through a coal belt scale after passing through a crusher, and under the action of a grinding rod, coal slurry is manufactured. Because the coal briquette has larger particles and short retention time in the mill, the coal cannot be effectively ground in the mill, the coal slurry prepared by grinding has poor stability, and the concentration of the coal slurry is often unqualified. Directly influences the yield of the effective gas of the subsequent system. The large particles of the coal briquette are not beneficial to grinding of the mill, so that the mill is frequently replaced with a grinding rod and overhauled.
Disclosure of Invention
The utility model aims to provide a coal slurry grinding device which can effectively improve the concentration of coal slurry through secondary grinding, ensure the stable operation of a coal grinding system and improve the total amount of downstream effective gas components.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a coal slurry grinder, includes coal pulverizer and coal slurry groove, its characterized in that, the device still includes coal slurry concentration pump, coal slurry groove bottom coal slurry exit linkage coal slurry concentration pump, coal slurry concentration pump downstream contains two parallelly connected branch pipes, and a concentration pipe is connected to the coal pulverizer charge door, a back flow is connected to the coal slurry entry at coal slurry groove top.
Furthermore, a flow limiting orifice plate is arranged on the return pipe.
Furthermore, a flowmeter is arranged on the concentration pipe.
Furthermore, the flowmeter is connected with a DCS to realize remote automatic control.
Furthermore, the coal slurry tank is provided with a stirrer.
According to the coal slurry grinding device, part of coal slurry flows back to the inlet of the coal mill through the coal slurry concentration pump and the concentration pipe, and the concentration of the coal slurry is effectively improved through secondary grinding. And one part of the coal slurry tank enters the inlet of the coal mill to replace raw coal, and in order to enable the coal slurry concentration pump to adapt to normal operation under different working conditions, one part of the coal slurry flows back to the coal slurry tank. Part of the coal slurry flows back to enter the inlet of the coal mill, and the coal slurry partially replaces the raw material coal, so that the metering of the raw material coal is reduced, and the proportion of the raw material coal at the inlet of the coal mill is changed. Raw material coal is replaced by partial coal slurry, so that particles entering a coal mill are reduced, raw coal mixed with feeding can be ground in the coal mill more fully, the relative retention time of the raw coal mixed with feeding in the coal mill is prolonged, the granularity of pulverized coal is reduced, the stability of the coal slurry is improved through secondary grinding, and the concentration of the prepared coal slurry can be correspondingly improved.
Has the advantages that: according to the coal slurry grinding device, the coal slurry concentration pump and the concentration pipe are arranged, so that the relative retention time of the coal slurry in the coal mill is increased, and the coal slurry concentration is increased to a certain extent; and after the coal slurry is shunted by the backflow pipe, the flow of the coal slurry backflow amount is controlled by the coal slurry concentration pump, and the coal slurry concentration can be adjusted in time. After the concentration of the coal slurry is improved, the yield of the effective gas can be effectively increased, and the economic benefit is increased. Meanwhile, the overhaul and the maintenance of the mill can be reduced, the maintenance cost is reduced, and the production operation of the device is stabilized.
Drawings
FIG. 1 is a schematic structural view of a coal slurry grinding apparatus according to the present invention;
the system comprises a coal slurry concentration pump 1, a flow-limiting orifice plate 2, an electromagnetic flowmeter 3, a discharge pump 4, a coal mill 5 and a coal slurry tank 6.
Detailed Description
The technical solutions of the present invention are further described in detail by the following specific examples, but it should be noted that the following examples are only used for describing the content of the present invention and should not be construed as limiting the scope of the present invention.
Fig. 1 is a schematic structural view of a coal slurry grinding apparatus according to the present invention.
The coal grinding is to grind coal, water, additive and limestone into water-coal slurry with high concentration, low viscosity, good stability and easy pumping, and provides qualified raw materials for gasification. In the coal slurry preparation system, coal with the diameter of less than 25mm from a coal storage and transportation system is added into a coal hopper, and raw coal in the coal hopper is sent into a coal pulverizer 5 through a belt coal feeder; in the coal mill 5, raw coal, water and additives are ground to prepare coal water slurry with qualified quality, and the coal water slurry is sent into a coal slurry tank 6, wherein a stirrer is arranged in the coal slurry tank 6 and is conveyed to the next procedure by a discharge pump 4 at the bottom of the tank.
According to the utility model, on the premise of the existing device, the existing device is optimized and improved, a coal slurry concentration pump 1 is additionally arranged at the bottom of a coal slurry tank 6, a concentration pipe and a return pipe which are connected in parallel are arranged at the downstream, the concentration pipe is connected to a feed inlet of a coal mill 5, the return pipe is connected to a coal slurry inlet at the top of the coal slurry tank 6, so that part of coal slurry obtained by grinding through the coal mill 5 in the coal slurry tank 6 enters the inlet of the coal mill 5 to replace raw coal, and part of the coal slurry flows back to the coal slurry tank 6. The coal slurry of part backward flow gets into 5 entrys of coal pulverizer and replaces the raw coal, changes raw coal feeding ratio coal to reduce the granule that gets into 5 raw materialss of coal pulverizer, can let the more abundant of raw coal grinding, increase the relative dwell time of coal slurry at coal pulverizer 5, through the secondary grinding, make the effectual improvement of coal slurry concentration ability. After the concentration of the coal slurry is improved, the yield of the effective gas can be effectively improved
The coal slurry concentration pump 1 is additionally arranged at the bottom of the coal slurry tank 6, the flow-limiting pore plate 2 (the minimum backflow amount of the pump) is arranged on the backflow pipe at the downstream of the coal slurry concentration pump 1, the electromagnetic flowmeter 3 is arranged on the concentration pipe entering the coal pulverizer 5, and the electromagnetic flowmeter 3 is connected with the DCS, so that remote automatic monitoring can be realized. Can in time adjust the rotational speed of coal thick liquid concentration pump 1 according to coal thick liquid concentration, change raw coal feeding ratio coal to reduce the granule that gets into coal pulverizer 5, can let more abundant that raw coal ground in coal pulverizer 5, increase the relative dwell time of coal thick liquid at coal pulverizer 5, prepare the coal thick liquid of relative high concentration through the secondary grinding, thereby stabilize production, increase the income.
The indexes of the coal slurry before and after the coal slurry grinding device of the utility model is adopted and the gas production indexes of the downstream are shown in tables 1 and 2.
TABLE 1 original device index
TABLE 2 indexes after secondary grinding
As can be seen from the comparison of the indexes in the table above, after the coal slurry is subjected to secondary grinding, the concentration of the coal slurry is improved to a certain extent (60.54 is improved to 61.52), the viscosity of the coal slurry is basically stabilized at about 950, and the concentration of the coal slurry is increased by 1%. In the subsequent production, when the system load is the same, the effective gas is increased by about 2500NM/H, the gas conversion rate is also increased to a certain extent, and the effective gas in the gas is increased by 80.50%. The system runs stably after improvement, and the follow-up gas amount is increased to a certain extent, so that stable production is realized, the benefit is increased, and the production of the device is ensured to be full and excellent.
Claims (5)
1. The utility model provides a coal slurry grinder, includes coal pulverizer and coal slurry groove, its characterized in that, the device still includes coal slurry concentration pump, coal slurry groove bottom coal slurry exit linkage coal slurry concentration pump, coal slurry concentration pump downstream contains two parallelly connected branch pipes, and a concentration pipe is connected to the coal pulverizer charge door, a back flow is connected to the coal slurry entry at coal slurry groove top.
2. The coal slurry grinding device according to claim 1, wherein a flow restricting orifice plate is provided on the return pipe.
3. The coal slurry grinding device according to claim 1, wherein a flow meter is arranged on the concentration pipe.
4. The coal slurry grinding device according to claim 3, wherein the flow meter is connected to the DCS.
5. The coal slurry grinding device according to claim 1, wherein the coal slurry tank is provided with an agitator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122404699.6U CN215855937U (en) | 2021-09-30 | 2021-09-30 | Coal slurry grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122404699.6U CN215855937U (en) | 2021-09-30 | 2021-09-30 | Coal slurry grinding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215855937U true CN215855937U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122404699.6U Active CN215855937U (en) | 2021-09-30 | 2021-09-30 | Coal slurry grinding device |
Country Status (1)
| Country | Link |
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| CN (1) | CN215855937U (en) |
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2021
- 2021-09-30 CN CN202122404699.6U patent/CN215855937U/en active Active
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