CN111073716A - Production equipment and production method of coal slurry for pipe transportation - Google Patents
Production equipment and production method of coal slurry for pipe transportation Download PDFInfo
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- CN111073716A CN111073716A CN202010027026.0A CN202010027026A CN111073716A CN 111073716 A CN111073716 A CN 111073716A CN 202010027026 A CN202010027026 A CN 202010027026A CN 111073716 A CN111073716 A CN 111073716A
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
Abstract
The invention discloses production equipment for coal slurry conveyed by a pipe, which comprises a fine crusher, wherein a slack coal buffer bin is arranged below a discharge port of the fine crusher, a constant feeder is arranged below a discharge port of the slack coal buffer bin, a discharge port of the constant feeder is connected with a rod mill through a first pipeline, a safety screen is arranged below a discharge port of the rod mill, the safety screen is connected with a buffer slurry tank through a second pipeline, the buffer slurry tank is connected with a underflow pump through a third pipeline, a discharge port of the underflow pump is connected with a storage tank through a fourth pipeline, a discharge port of the storage tank is connected with a slurry feeding pump through a fifth pipeline, and a discharge port of the slurry feeding pump is connected with a main pump through a sixth pipeline; the safety screen is connected with a slurry return tank through a seventh pipeline, a discharge port of the slurry return tank is connected with a slurry return pump through an eighth pipeline, and a discharge port of the slurry return pump is communicated with a feed inlet of the rod mill through a slurry return pipe. The method for producing the coal slurry transported by the pipe by using the equipment is suitable for long-distance transportation.
Description
Technical Field
The invention relates to the technical field of coal slurry preparation and conveying, in particular to production equipment of coal slurry conveyed by a pipe, and further relates to a production method of the coal slurry conveyed by the pipe.
Background
At present, the transportation of coal is mainly carried out by railway, highway and waterway transportation, the transportation cost is high, the return empty rate is also high, and the environmental pollution is large. The pipeline coal conveying can be used as an economic, environment-friendly and safe transportation mode.
The coal slurry conveying pipeline has successful practice of American Heimaza pipeline in industrial operation in the world, and the pipeline conveys low-concentration coal slurry with the weight concentration range of 43-48 percent; the high-concentration coal slurry conveying pipeline is built in 1986, is jointly built by Su Union and Italy, is blocked during the test operation, and is not operated. The method has very important reference significance for pipeline transportation of coal slurry. The process for conveying the pulp pipeline in China is mature, and the Shenwei pipeline for conveying the coal pulp pipeline belongs to the first example in China. The transportation scale of the Shenwei pipeline coal slurry is 10Mt per year, and the transportation distance is 727 km. How to ensure the large-scale long-distance safe transportation of the coal slurry in industrialization is particularly critical for the preparation of the coal slurry with qualified concentration.
Therefore, there is a need in the art to develop a method for preparing coal slurry suitable for large-scale transportation over long distances, which strictly controls the concentration of coal slurry and ensures the safe transportation of coal slurry in pipelines.
Disclosure of Invention
The invention aims to provide production equipment for coal slurry conveyed by a pipe, and the prepared coal slurry is suitable for long-distance large-scale conveying.
The invention also aims to provide the production equipment of the coal slurry transported by the pipe, and the prepared coal slurry is suitable for long-distance large-scale transportation and can ensure the safe transportation of the coal slurry in the pipe.
The technical scheme adopted by the invention is that the production equipment for the coal slurry conveyed by the pipe comprises a fine crusher, wherein a slack coal buffer bin is arranged below a discharge port of the fine crusher, a constant feeder is arranged below a discharge port of the slack coal buffer bin, a discharge port of the constant feeder is connected with a rod mill through a first pipeline, a safety screen is arranged below a discharge port of the rod mill, the safety screen is connected with a buffer slurry tank through a second pipeline, the buffer slurry tank is connected with an underflow pump through a third pipeline, a discharge port of the underflow pump is connected with a storage tank through a fourth pipeline, a discharge port of the storage tank is connected with a slurry feeding pump through a fifth pipeline, and a discharge port of the slurry feeding pump is connected with a main pump through a sixth pipeline; the safety screen is connected with a slurry return tank through a seventh pipeline, a discharge port of the slurry return tank is connected with a slurry return pump through an eighth pipeline, and a discharge port of the slurry return pump is communicated with a feed inlet of the rod mill through a slurry return pipe.
The present invention is also characterized in that,
a concentration meter is arranged on the third pipeline.
A first process water filling port is arranged on the first pipeline, and a slurry returning water filling port is arranged on the seventh pipeline; a secondary water filling port is arranged on the fifth pipeline; the first process water filling port, the slurry returning water filling port and the secondary water filling port are respectively connected with the water inlet pipe.
Still including useless thick liquid jar and ninth pipeline, useless thick liquid jar is through ninth pipeline and fourth pipeline intercommunication.
The invention adopts another technical scheme that the production method of the coal slurry transported by the pipe uses the production equipment of the coal slurry transported by the pipe, and is implemented according to the following steps:
step 1: grinding and pulping by a rod mill:
crushing a coal raw material by a fine crusher to below 6mm, dropping the crushed coal raw material to a slack coal buffer bin, quantitatively feeding the crushed coal raw material to a rod mill by a quantitative feeder, simultaneously adding water into the rod mill through a first process water adding port, controlling the water adding amount by adopting an electromagnetic flowmeter, and fully grinding coal slurry by the rod mill, and conveying the coal slurry to a safety screen through a rotary screen with the screen hole size of 3mm on the rod mill; oversize materials of the drum screen are pulled away by a trolley through a slag discharge port;
step 2: the safety screen strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve, mixing oversize materials with the granularity controlled below 3mm and the granularity above 3mm and water added through a slurry return water inlet into a slurry return tank, returning the coal slurry in the slurry return tank to a rod mill through a slurry return pump, and mixing and grinding the coal slurry with initial materials again; the undersize products with the granularity of less than 3mm are detected to be qualified by a concentration meter and then are sent into a storage tank by an underflow pump;
and step 3: the pumping process:
judging whether water is required to be added through a secondary water adding port according to the requirement of subsequent processes on the weight concentration of the coal slurry: if the weight concentration of the coal slurry in the storage tank is greater than the weight concentration requirement of the subsequent process on the coal slurry, water needs to be added through a secondary water adding port to adjust the weight concentration of the coal slurry, and then the coal slurry is conveyed to a main pump through a slurry feeding pump for long-distance conveying.
The present invention is also characterized in that,
in the step 1, the raw material of the coal is bituminous coal medium-long flame coal or non-sticky coal.
In the step 1, the feeding amount of the quantitative feeder is 100-250 t/h based on dry coal.
In the step 1, the water adding amount of a water adding port in the first process is 90-210 m3/h。
In step 2, the qualified standard is as follows: the weight concentration of the coal slurry is 50-55 percent; when the weight concentration of the coal slurry is lower than 50%, the unqualified coal slurry is directly pumped into the waste slurry tank through the fourth pipeline and the ninth pipeline in sequence by the underflow pump; the water adding amount of the slurry return water inlet is 16-23 m3The slurry return amount is 19-29 m3/h。
In the step 3, when water needs to be added through the secondary water adding port, the water adding amount of the secondary water adding port is 1-45 m3/h。
The preparation method has the beneficial effects that the rod mill is adopted for grinding and pulping in the process, and the concentration of the coal slurry is strictly controlled by adding water into the first process water adding port and the second process water adding port before the safety screen and the slurry feeding pump, so that the safety and the stability of the coal slurry transported by the pipe are ensured. The problem of large-scale long distance transportation of coal slurry is solved.
Drawings
FIG. 1 is a process flow diagram of a production facility for a pipeline coal slurry according to the present invention.
In the figure, 1, a fine crusher, 2, a slack coal buffer bin, 3, a constant feeder, 4, a rod mill, 5, a safety screen, 6, a buffer slurry tank, 7, a slurry return tank, 8, an underflow pump, 9, a slurry return pump, 10, a storage tank, 11, a slurry feeding pump, 12, a main pump, 13, a densimeter, 14, a trolley, 15, a first pipeline, 16, a second pipeline, 17, a third pipeline, 18, a fourth pipeline, 19, a fifth pipeline, 20, a sixth pipeline, 21, a seventh pipeline, 22, an eighth pipeline, 23, a slurry return pipe, 24, a first process water inlet, 25, a slurry return water inlet, 26, a secondary water inlet, 27, a waste slurry tank and 28, a ninth pipeline are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides production equipment for coal slurry conveyed by a pipe, which comprises a fine crusher 1, wherein a slack coal buffer bin 2 is arranged below a discharge port of the fine crusher 1, a quantitative feeder 3 is arranged below a discharge port of the slack coal buffer bin 2, a discharge port of the quantitative feeder 3 is connected with a rod mill 4 through a first pipeline 15, a safety screen 5 is arranged below a discharge port of the rod mill 4, the safety screen 5 is connected with a buffer slurry tank 6 through a second pipeline 16, the buffer slurry tank 6 is connected with a underflow pump 8 through a third pipeline 17, a discharge port of the underflow pump 8 is connected with a storage tank 10 through a fourth pipeline 18, a discharge port of the storage tank 10 is connected with a slurry feeding pump 11 through a fifth pipeline 19, and a discharge port of the slurry feeding pump 11 is connected with a main pump 12 through a sixth pipeline 20; the safety screen 5 is connected with a slurry return tank 7 through a seventh pipeline 21, a discharge port of the slurry return tank 7 is connected with a slurry return pump 9 through an eighth pipeline 22, and a discharge port of the slurry return pump 9 is communicated with a feed port of the rod mill 4 through a slurry return pipe 23.
A concentration meter 13 is provided on the third pipe 17.
A first process water filling port 24 is arranged on the first pipeline 15, and a slurry returning water filling port 25 is arranged on the seventh pipeline 21; a secondary water filling port 26 is arranged on the fifth pipeline 19; the first process water filling port 24, the slurry return water filling port 25 and the secondary water filling port 26 are respectively connected with a water inlet pipe.
The slurry tank 27 is communicated with the fourth pipeline 18 through the ninth pipeline 28.
The invention also provides a production method of the coal slurry transported by the pipe, which applies the production equipment and is implemented according to the following steps:
step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw material of the coal is bituminous coal medium-long flame coal or non-sticky coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 100-250 t/h based on dry coal.
In the step 1, the water adding amount of the water adding port 24 in the first process is 90-210 m3/h。
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected to be qualified by a concentration meter 13 and then are sent into a storage tank 10 by an underflow pump 8;
in step 2, the qualified standard is as follows: the weight concentration of the coal slurry is 50-55 percent; when the weight concentration of the coal slurry is lower than 50%, the unqualified coal slurry is directly pumped into the waste slurry tank 27 through the fourth pipeline 18 and the ninth pipeline 28 in sequence by the underflow pump 8; the water adding amount of the slurry return water inlet 25 is 16-23 m3The slurry return amount is 19-29 m3/h；
And step 3: the pumping process:
judging whether water is required to be added through the secondary water adding port 26 according to the requirement of the subsequent process on the weight concentration of the coal slurry: if the weight concentration of the coal slurry in the storage tank 10 is greater than the weight concentration requirement of the coal slurry in subsequent processes, water needs to be added through the secondary water adding port 26 to adjust the weight concentration of the coal slurry, and then the coal slurry is sent to the main pump 12 through the slurry feeding pump 11 for long-distance conveying;
in the step 3, when water needs to be added through the secondary water adding port 26, the water adding amount of the secondary water adding port 26 is 1-45 m3/h。
The coal slurry prepared by the preparation method is directly sent to a terminal station through a main pump in a long distance.
Example 1
A production method of pipe coal slurry is implemented according to the following steps:
step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is bituminous coal medium-long flame coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 100t/h based on dry coal.
In step 1, the water adding amount of the water adding port 24 of the first process is 90m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected by a concentration meter 13 that the weight concentration of the coal slurry is 50 percent, the coal slurry is qualified by inspection, and the coal slurry is sent into a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 23m3H, the stock return is 29m3/h；
And step 3: the pumping process:
50 percent meets the requirement of conveying concentration without adding water for the second time. Directly sent to the main pump 12 through the feeding pump 11 for long distance transportation to the terminal.
Example 2
A production method of pipe coal slurry is implemented according to the following steps:
step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is non-caking coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 150t/h based on dry coal.
In step 1, the water adding amount of the first process water adding port 24 is 133m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize product with the granularity of less than 3mm is detected by a concentration meter 13 that the weight concentration of the coal slurry is 53.0 percent, the coal slurry is qualified after the inspection, and the coal slurry is sent to a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 16m3H, the stock return is 19m3/h；
And step 3: the pumping process:
53.0 percent of the total content meets the requirement of conveying concentration, and secondary water addition is not needed. Directly sent to the main pump 12 through the feeding pump 11 for long distance transportation to the terminal.
Example 3
A production method of pipe coal slurry is implemented according to the following steps:
step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is non-caking coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 200t/h based on dry coal.
In step 1, the water adding amount of the water adding port 24 of the first process is 170m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected by a concentration meter 13 that the weight concentration of the coal slurry is 54.0 percent, the coal slurry is qualified after the inspection, and the coal slurry is sent to a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 20m3H, the stock return is 26m3/h；
And step 3: the pumping process:
the conveying concentration of the coal slurry conveyed by the pipe is set to be 53.0 percent, the actually measured coal slurry concentration is higher than 54.0 percent, secondary water adding is adopted, and the water adding amount is 17.8m3And h, thickening adjustment is carried out, and the concentrated solution is sent to a main pump 12 through a slurry feeding pump 11 and is conveyed to a terminal for a long distance.
Example 4
Step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is non-caking coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 250t/h based on dry coal.
In step 1, the water adding amount of the first process water adding port 24 is 210m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected by a concentration meter 13 that the weight concentration of the coal slurry is 54.5 percent, the coal slurry is qualified by inspection, and the coal slurry is sent to a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 18m3H, the stock return amount is 24m3/h；
And step 3: the pumping process:
the conveying concentration of the coal slurry conveyed by the pipe is set to be 52.5 percent, the actually measured concentration of the coal slurry is higher than 54.5 percent, secondary water adding is adopted, and the water adding amount is 35.5m3And h, thickening adjustment is carried out, and the concentrated solution is sent to a main pump 12 through a slurry feeding pump 11 and is conveyed to a terminal for a long distance.
Example 5
Step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is non-caking coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 180t/h based on dry coal.
In step 1, the water adding amount of the water adding port 24 of the first process is 147m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected by a concentration meter 13 that the weight concentration of the coal slurry is 55.0 percent, the coal slurry is qualified after the inspection, and the coal slurry is sent to a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 20m3H, the stock return is 23m3/h；
And step 3: the pumping process:
the conveying concentration of the coal slurry conveyed by the pipe is set to be 53.0 percent, the actually measured concentration of the coal slurry is higher than 55.0 percent, secondary water adding is adopted, and the water adding amount is 35.5m3And h, thickening adjustment is carried out, and the concentrated solution is sent to a main pump 12 through a slurry feeding pump 11 and is conveyed to a terminal for a long distance.
Example 6
Step 1: grinding and pulping by a rod mill 4:
crushing the coal raw material to 6mm by a fine crusher 1 to fall to a slack coal buffer bin 2, quantitatively feeding the crushed coal raw material to a rod mill 4 by a quantitative feeder 3, adding water into the rod mill 4 through a first process water adding port 24, controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill 4, and conveying the coal slurry to a safety screen 5 through a rotary screen with the screen hole size of 3mm on the rod mill 4; oversize materials of the drum screen are pulled away by a trolley 14 through a slag discharge port;
in the step 1, the raw coal is non-caking coal.
In the step 1, the feeding amount of the quantitative feeder 3 is 160t/h based on dry coal.
In step 1, the water adding amount of the first process water adding port 24 is 131m3/h；
Step 2: the safety screen 5 strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve 5, controlling the granularity to be below 3mm, mixing oversize materials with the granularity of more than 3mm and water added through a slurry return water inlet 25 into a slurry return tank 7, returning the coal slurry in the slurry return tank 7 to the rod mill 4 through a slurry return pump 9, and mixing and grinding the coal slurry with the initial materials again; the undersize products with the granularity of less than 3mm are detected by a concentration meter 13 that the weight concentration of the coal slurry is 55.0 percent, the coal slurry is qualified after the inspection, and the coal slurry is sent to a storage tank 10 by a underflow pump 8;
in the step 2, the water adding amount of the slurry return water inlet 25 is 23m3H, the stock return is 29m3/h；
And step 3: the pumping process:
the conveying concentration of the coal slurry conveyed by the pipe is set to be 52.5 percent, the actually measured concentration of the coal slurry is higher than 55.0 percent, secondary water adding is adopted, and the water adding amount is 44m3And h, thickening adjustment is carried out, and the concentrated solution is sent to a main pump 12 through a slurry feeding pump 11 and is conveyed to a terminal for a long distance.
Claims (10)
1. The production equipment of the pipe coal slurry is characterized by comprising a fine crusher (1), wherein a slack coal buffer bin (2) is arranged below a discharge port of the fine crusher (1), a constant feeder (3) is arranged below a discharge port of the slack coal buffer bin (2), a discharge port of the constant feeder (3) is connected with a rod mill (4) through a first pipeline (15), a safety screen (5) is arranged below a discharge port of the rod mill (4), the safety screen (5) is connected with a buffer slurry tank (6) through a second pipeline (16), the buffer slurry tank (6) is connected with an underflow pump (8) through a third pipeline (17), a discharge port of the underflow pump (8) is connected with a storage tank (10) through a fourth pipeline (18), a discharge port of the storage tank (10) is connected with a slurry feeding pump (11) through a fifth pipeline (19), a discharge hole of the slurry feeding pump (11) is connected with a main pump (12) through a sixth pipeline (20); the safety screen (5) is connected with a slurry return tank (7) through a seventh pipeline (21), a discharge port of the slurry return tank (7) is connected with a slurry return pump (9) through an eighth pipeline (22), and the discharge port of the slurry return pump (9) is communicated with a feed inlet of the rod mill (4) through a slurry return pipe (23).
2. The tubular coal slurry production equipment according to claim 1, wherein a concentration meter (13) is arranged on the third pipeline (17).
3. The production equipment of the coal slurry transported by the pipe according to the claim 1 is characterized in that the first pipeline (15) is provided with a first process water adding port (24), and the seventh pipeline (21) is provided with a slurry returning water adding port (25); a secondary water filling port (26) is arranged on the fifth pipeline (19); the first process water filling port (24), the slurry return water filling port (25) and the secondary water filling port (26) are respectively connected with a water inlet pipe.
4. The pipeline coal slurry production equipment according to claim 1, further comprising a waste slurry tank (27) and a ninth pipeline (28), wherein the waste slurry tank (27) is communicated with the fourth pipeline (18) through the ninth pipeline (28).
5. A production method of the coal slurry transported by the pipe is used for producing the coal slurry transported by the pipe according to any one of claims 1 to 4, and is characterized by comprising the following steps:
step 1: grinding and pulping by a rod mill (4):
crushing coal raw materials to be less than 6mm by a fine crusher (1), dropping the crushed coal raw materials to a slack coal buffer bin (2), quantitatively feeding the crushed coal raw materials to a rod mill (4) by a quantitative feeder (3), simultaneously adding water into the rod mill (4) through a first process water adding port (24), controlling the water adding amount by adopting an electromagnetic flowmeter, fully grinding coal slurry by the rod mill (4), and conveying the coal slurry to a safety screen (5) through a rotary screen with the screen hole size of 3mm on the rod mill (4); oversize materials of the drum screen are pulled away by a trolley (14) through a slag discharge port;
step 2: the safety screen (5) strictly controls the granularity of the coal slurry:
conveying the coal slurry prepared in the step 1 to a safety sieve (5), controlling the granularity to be below 3mm, mixing oversize materials with the granularity of above 3mm and water added through a slurry return water inlet (25) into a slurry return tank (7), returning the coal slurry in the slurry return tank (7) to a rod mill (4) through a slurry return pump (9), and mixing and grinding the coal slurry and the initial materials again; the undersize products with the granularity of less than 3mm are detected to be qualified by a concentration meter (13) and then are sent into a storage tank (10) by an underflow pump (8);
and step 3: the pumping process:
judging whether water needs to be added through a secondary water adding port (26) according to the requirement of the subsequent process on the weight concentration of the coal slurry: if the weight concentration of the coal slurry in the storage tank (10) is larger than the weight concentration requirement of the coal slurry in subsequent processes, water needs to be added through a secondary water adding port (26) to adjust the weight concentration of the coal slurry, and then the coal slurry is sent to the main pump (12) through the slurry feeding pump (11) for long-distance conveying.
6. The production equipment of the coal slurry transported by the pipe according to the claim 5, characterized in that in the step 1, the coal raw material is bituminous coal medium-long flame coal or non-sticky coal.
7. The production equipment of the coal slurry transported by the pipe according to the claim 5 is characterized in that in the step 1, the feeding amount of the quantitative feeder (3) is 100-250 t/h based on dry coal.
8. The production equipment of the coal slurry transported by the pipe as claimed in claim 5, wherein in the step 1, the water adding amount of the first process water adding port (24) is 90-210 m3/h。
9. The pipeline coal slurry production device of claim 5, wherein in the step 2, the qualified standard is as follows: the weight concentration of the coal slurry is 50-55 percent; when the weight concentration of the coal slurry is lower than 50%, the unqualified coal slurry is directly pumped into a waste slurry tank (27) through a fourth pipeline (18) and a ninth pipeline (28) in sequence by a underflow pump (8); the water adding amount of the slurry returning water inlet (25) is 16-23 m3The slurry return amount is 19-29 m3/h。
10. The production equipment of the coal slurry transported by the pipe as claimed in claim 5, wherein in step 3, when water needs to be added through the secondary water adding port (26), the water adding amount of the secondary water adding port (26) is 1-45 m3/h。
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| CN114015478A (en) * | 2021-11-17 | 2022-02-08 | 西安元创化工科技股份有限公司 | Coal slurry concentration and granularity control system and method in synthetic gas production process |
| CN115854261A (en) * | 2022-12-20 | 2023-03-28 | 中煤科工集团武汉设计研究院有限公司 | Pipe coal slurry conveying quality control detection system and method with gradient adjusting function |
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