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Method for preparing and conveying coal slurry

A technology of coal slime and coal slurry, which is applied in peat processing, petroleum industry, etc., can solve the problems of high system operation and maintenance costs, high installed power, and high equipment pressure requirements, and achieve environmental protection, energy saving and economic effects. Effects of improving service life and reducing equipment wear

Inactive Publication Date: 2009-03-25
范家峰 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current pipeline transportation system mainly uses high-pressure piston pumps for pumping. Although it can achieve long-distance transportation, the transportation system requires a pressure of 10-30MP and the installed power is relatively high, so the pressure requirements for the equipment are relatively high. Therefore, the system High operating and maintenance costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use a certain coal slime, add industrial water and papermaking waste liquid, stir, then add limestone particles with a desulfurization agent of 1-2mm, and then transport the prepared coal slurry to the boiler in the fluidized bed at a distance of 320 meters, and transport the coal slime The amount is 20 tons / hour. Among them, the moisture content of papermaking black liquor is 85%, and its low calorific value is about 2350kj / kg, which is about 550 kcal. Limestone purity is 87.5%. The elemental analysis of coal slime and papermaking black liquor is as follows

[0014] Table 1. Base component analysis of coal slime application

[0015] Car% Har% Oar% Nar% St, ar% Aar% Mar% 47.80 2.72 6.67 0.97 0.37 16.90 24.57

[0016] Table 2 Application base component analysis of papermaking black liquor

[0017] Car% Har% Oar% Nar% St, ar% K, ar% Aar% Mar% 4.98 0.74 5.59 0.99 0.05 0.30 2.45 85

[0018] Accord...

Embodiment 2

[0023] Use a certain coal slime, add industrial water, papermaking waste liquid and desulfurizer, stir to prepare the coal slurry, and then transport the prepared coal slurry to the 250-meter fluidized bed boiler, and the delivery rate of the coal slurry is 40 tons / Hour. The moisture content in papermaking black liquor is 90%, and its low calorific value is about 2000kj / kg, which is about 500 kcal. Limestone is 93% pure. The composition analysis of coal slime and papermaking black liquor is shown in Table 3 and Table 4.

[0024] Table 3 Base component analysis of coal slime application

[0025] Car% Har% Oar% Nar% St, ar% Aar% Mar% 46.70 2.64 6.62 0.85 0.89 16.18 26.12

[0026] Table 4 Analysis of received base components of papermaking black liquor

[0027] Car% Har% Oar% Nar% St, ar% K, ar% Aar% Mar% 3.32 0.49 3.7 0.62 0.19 0.28 1.4 90

[0028] According to the above situation, the preparation met...

Embodiment 3

[0033]Use a certain coal slime, humidify it and add a desulfurizer to stir it to prepare a coal slurry with good fluidity, and then transport the prepared coal slurry to the boiler in the fluidized bed at a distance of 150 meters, and the delivery volume of the coal slurry is 30 tons / hour. The composition of coal slime and papermaking black liquor is shown in the table below. The moisture content in papermaking black liquor is 80%, and its low calorific value is about 2500kj / kg, which is about 600 kcal. Limestone purity is 89.5%.

[0034] Table 5 Base component analysis of coal slime application

[0035] Car% Har% Oar% Nar% St, ar% Aar% Mar% 47.09 2.66 6.68 0.86 0.90 16.32 25.50

[0036] Table 6 Analysis of received base components of papermaking black liquor

[0037] Car% Har% Oar% Nar% St, ar% K, ar% Aar% Mar% 6.64 0.99 7.40 1.24 0.37 0.56 2.80 80.00

[0038] According to the above situation, the p...

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Abstract

The invention relates to a method for preparing and transmitting coal slurry. At present, high pressure piston pumps are adopted for pumping mostly, which has very high requirement on the bearing pressure of equipment and requires quite high operation and maintenance costs. The method is characterized in that: the coal slurry which comes out from a coal washery is broken, removed of impurities and then stirred, black liquor and limestone particles are added during stirring to form coal mud, and then industrial water is added and stirring is continued. The coal mud is transmitted to a boiler and then to a plurality of feeding inlets arranged in the middle part of the boiler by adopting a plurality of low pressure pumps, with the coal slurry flow at each feeding inlet ranging from 5 tons to 7 tons per hour. Pretreatment is carried out on the coal slurry in the method so that the water content of the coal slurry meets the requirement for being suitable to transmission through the pumps; and feeding at the middle part with multiple points is adopted, thus realizing the transmission of the coal slurry at low pressure and low energy consumption, and further being beneficial to the stable burning of the coal slurry in the boiler.

Description

technical field [0001] The invention belongs to the technical field of fuel, and relates to a pipeline coal slime preparation and transportation method under the comprehensive consideration of energy saving, environmental protection and cost reduction. Background technique [0002] The annual output of coal slime in my country has exceeded 30 million tons. It is discharged or piled up as solid waste, which will have a serious impact on the coal mine and its surrounding environment. Using it as a fuel for power generation can turn waste into treasure and achieve a very good Therefore, some mining areas have established coal slime power plants near coal washing plants, using circulating fluidized bed technology to use coal slime as fuel, and the heat generated by combustion is used for power generation. One of the main problems of coal slime power generation is the transportation of coal slime. Due to the high water content and poor rheological properties of coal slime, its tra...

Claims

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Application Information

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IPC IPC(8): C10F7/00
Inventor 范家峰邵兵杨家林
Owner 范家峰
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