阅读说明：本技术 一种脱硫洗煤工艺及设备 (Desulfurization coal washing process and equipment ) 是由 亓传玉 于 2020-03-14 设计创作，主要内容包括：本发明公开了一种脱硫洗煤工艺,包括以下步骤：步骤一：分选；步骤二：破碎；步骤三：脱硫：脱硫剂溶解并加热后注入脱硫洗煤设备中,原煤在脱硫洗煤设备内部进行输送,输送的过程中与脱硫剂溶解液充分氧化反应；步骤四：清洗：向步骤三得到的脱硫煤中通入洗煤水进行充分清洗；步骤五：烘干：将步骤四得到的煤进行充分烘干；步骤六：洗煤；本发明公开了一种脱硫洗煤设备,包括脱硫输送系统、脱硫剂循环系统、洗煤水循环系统和烘干系统；原煤通过脱硫输送系统进行输送,输送过程中依次经过脱硫、清洗、烘干,最后进入洗煤机处理；本发明可以实现脱硫洗煤,且脱硫洗煤过程可连续不间断操作,提高脱硫效率；洗煤后不会影响低位发热量。(The invention discloses a desulfurization coal washing process, which comprises the following steps: the method comprises the following steps: sorting; step two: crushing; step three: and (3) desulfurization: dissolving and heating a desulfurizer, injecting the desulfurizer into desulfurization coal washing equipment, conveying raw coal in the desulfurization coal washing equipment, and fully oxidizing and reacting the raw coal with a desulfurizer dissolving solution in the conveying process; step four: cleaning: introducing coal washing water into the desulfurized coal obtained in the step three for full cleaning; step five: drying: fully drying the coal obtained in the step four; step six: washing coal; the invention discloses desulfurization coal washing equipment, which comprises a desulfurization conveying system, a desulfurizer circulating system, a coal washing water circulating system and a drying system, wherein the desulfurization conveying system is connected with the desulfurizer circulating system; conveying raw coal through a desulfurization conveying system, sequentially performing desulfurization, cleaning and drying in the conveying process, and finally feeding the raw coal into a coal washer for treatment; the invention can realize desulfurization coal washing, and the desulfurization coal washing process can be continuously operated, thereby improving the desulfurization efficiency; the low-level heating value is not influenced after coal washing.)

1. A desulfurization coal washing process is characterized in that: the method specifically comprises the following steps:

the method comprises the following steps: sorting: raw coal is distinguished, and raw coal blocks with the particle size of 20-40mm are selected to enter desulfurization coal washing equipment;

step two: crushing: crushing the large raw coal selected in the step one into coal blocks with the granularity of 20-40mm, and feeding the crushed coal blocks into desulfurization coal washing equipment;

step three: and (3) desulfurization: dissolving and heating a desulfurizer, injecting the desulfurizer into desulfurization coal washing equipment, conveying raw coal in the desulfurization coal washing equipment, and fully oxidizing and reacting the raw coal with a desulfurizer dissolving solution in the conveying process;

step four: cleaning: introducing coal washing water into the desulfurized coal obtained in the step three for full cleaning;

step five: drying: fully drying the coal obtained in the step four;

step six: coal washing: and D, conveying the coal obtained in the step five to a coal washer.

2. The desulfurization coal washing process of claim 1, characterized in that: the desulfurizer in the third step is prepared by uniformly mixing 10-20 parts of caustic soda, 15 parts of soda ash, 30-50 parts of quicklime, 5 parts of sodium cobalt phthalocyanine tetrasulfonate and 150 parts of water, and the raw coal is mixed with 1.5 wt% of desulfurizer.

3. The desulfurization coal washing process of claim 1, characterized in that: and the heating temperature of the desulfurizer dissolving solution in the third step is 100-120 ℃.

4. The desulfurization coal washing process of claim 1, wherein the coal washing water in the fourth step is prepared by mixing 10-15 parts of polyacrylamide, 10-15 parts of polyaluminum chloride and 20-30 parts of defoamer, and adding 50 g/L of the mixture into water.

5. A desulfurization coal washing equipment is characterized in that: comprises a desulfurization conveying system (1), a desulfurizer circulating system (2), a coal washing water circulating system (3) and a drying system (4); the raw coal is conveyed through a desulfurization conveying system (1), and is subjected to desulfurization, cleaning and drying in sequence in the conveying process and finally enters a coal washer for treatment.

6. The desulfurization coal washing apparatus according to claim 5, characterized in that: the desulfurization conveying system (1) comprises four vertical charging barrels which are sequentially arranged, namely a first vertical charging barrel (101), a second vertical charging barrel (102), a third vertical charging barrel (103) and a fourth vertical charging barrel (104), wherein a pipe chain is arranged in each vertical charging barrel in a penetrating manner, and a charging tray is arranged on each pipe chain; the lower ends of the first vertical charging barrel (101) and the second vertical charging barrel (102) are respectively communicated with a first 180-degree steering box (105) through flanges, the top ends of the second vertical charging barrel (102) and the third vertical charging barrel (103) are respectively communicated with a second 180-degree steering box (106) through flanges, and the lower ends of the third vertical charging barrel (103) and the fourth vertical charging barrel (104) are respectively communicated with a third 180-degree steering box (107) through flanges; the top ends of the first vertical material cylinder (101) and the fourth vertical material cylinder (104) are respectively communicated with a 90-degree steering box (108), and the two 90-degree steering boxes (108) are communicated through a horizontal material cylinder (109).

7. The desulfurization coal washing apparatus according to claim 6, characterized in that: a feed hopper (110) is arranged on the outer side of the upper end part of the first vertical charging barrel (101), and the feed hopper (110) is communicated with the inner cavity of the first vertical charging barrel (101); the bottom of the horizontal charging barrel (109) is provided with a discharging hopper (111).

8. The desulfurization coal washing apparatus according to claim 5, characterized in that: the desulfurizer circulating system (2) comprises a desulfurizer circulating pump (201), an inlet of the desulfurizer circulating pump (201) is communicated with a desulfurizer return pipe (205), the desulfurizer return pipe (205) is communicated with an inner cavity of the second vertical charging barrel (102), an outlet of the desulfurizer circulating pump (201) is communicated with a desulfurizer filtering device (202) through a pipeline, the desulfurizer filtering device (202) is communicated with a desulfurizer storage barrel (203) through a pipeline, and a high-pressure heating device (206) is arranged outside the desulfurizer storage barrel (203); the desulfurizer storage cylinder (203) is communicated with one end of a desulfurizer inlet pipe (204), and the other end of the desulfurizer inlet pipe (204) is communicated with the first vertical charging cylinder (101).

9. The desulfurization coal washing apparatus according to claim 5, characterized in that: coal washing water circulating system (3) is including coal washing water circulating pump (301), and the import of coal washing water circulating pump (301) communicates with the one end of coal washing water return pipe (305), and the other end and the vertical feed cylinder of third (103) inner chamber intercommunication of coal washing water return pipe (305), and the export and the coal washing water filter equipment (302) of coal washing water circulating pump (301) communicate, and coal washing water filter equipment (302) and coal washing water storage barrel (303) intercommunication, and coal washing water storage barrel (303) advance pipe (304) through coal washing water and communicate with the vertical feed cylinder of fourth (104).

10. The desulfurization coal washing apparatus according to claim 5, characterized in that: drying system (4) include high temperature blower (401) and go out tuber pipe (402), the export and the play tuber pipe (402) intercommunication of high temperature blower (401), go out tuber pipe (402) cover and establish the top at the vertical feed cylinder of fourth (104) and be linked together with the vertical feed cylinder of fourth (104).

Technical Field

The invention relates to a desulfurization coal washing process and equipment, belonging to the technical field of coal washing.

Background

The content of sulfur in Chinese coal varies greatly (0.2-8%). The average ash content of the coal resources in China is 17 percent, and the average sulfur content is 1.11 percent. The coal with high ash content and high sulfur content has a high specific gravity, the high sulfur coal reserves account for about 1/3 of the total coal quantity, the average sulfur content of the coal in the southwest region is 3.23%, the average sulfur content of the coal in the northwest region is 3.05%, the average sulfur content of the coal in the southwest region is 2.0206%, the average sulfur content of the coal in the northeast of China is 1.65%, and the average sulfur content of the coal in the Shandong region is more than 2%. Coal combustion is more serious than other kinds of fossil fuel pollution, and the quantity of coal production and consumption in China is increased year by year, so that serious atmospheric pollution conditions occur in China, and the situation not only causes the national economic loss with extremely high quantity, but also is extremely unfavorable for environmental protection and the body health of people. In order to effectively reduce the air pollution caused by coal combustion, the pollution problem caused by sulfur dioxide emission should be reduced by professional and effective desulfurization technology, so that the implementation of the sustainable development strategy can be really promoted.

The desulfurization of coal carbon can be divided into desulfurization before combustion, desulfurization during combustion and desulfurization after combustion according to the difference of desulfurization procedures in the coal utilization process. Desulfurization of coal before combustion can be classified into a physical desulfurization method, a chemical desulfurization method, a biological desulfurization method, and the like.

The chemical desulfurizing method includes chemical reaction of chemical reagent with coal under certain condition to convert sulfur in coal into soluble matter and subsequent elution from coal, and may be divided into alkali treating process, oxidizing process, solvent extracting process, pyrolysis process, microwave treating process, etc. the available chemical desulfurizing method has great demerits, including ① desulfurizing process, low desulfurizing efficiency, ② coal washing with increased water, ③ coal washing with increased cost, ④ coal washing with great water consumption and water source shortage in mine area, and ⑤ coal washing with great investment and high coal washing cost.

In summary, the prior art obviously has inconvenience and defects in practical use, so a new desulfurization coal washing process and equipment are needed to solve the disadvantages of the prior art.

Disclosure of Invention

Aiming at the defects, the invention provides a desulfurization coal washing process and equipment, which can realize desulfurization coal washing, and the desulfurization coal washing process can be continuously operated, thereby improving the desulfurization efficiency; the low-level heating value cannot be influenced after coal washing; the coal washing in winter does not need to be subjected to anti-freezing treatment; the coal washing water is recycled, so that the coal washing water consumption is reduced, and the water resource is saved; the coal washing investment is reduced, and the coal washing cost is controlled.

In order to solve the technical problems, the invention adopts the following technical scheme:

a desulfurization coal washing process specifically comprises the following steps:

the method comprises the following steps: sorting: raw coal is distinguished, and raw coal blocks with the particle size of 20-40mm are selected to enter desulfurization coal washing equipment;

step two: crushing: crushing the large raw coal selected in the step one into coal blocks with the granularity of 20-40mm, and feeding the crushed coal blocks into desulfurization coal washing equipment;

step three: and (3) desulfurization: dissolving and heating a desulfurizer, injecting the desulfurizer into desulfurization coal washing equipment, conveying raw coal in the desulfurization coal washing equipment, and fully oxidizing and reacting the raw coal with a desulfurizer dissolving solution in the conveying process;

step four: cleaning: introducing coal washing water into the desulfurized coal obtained in the step three for full cleaning;

step five: drying: fully drying the coal obtained in the step four;

step six: coal washing: and D, conveying the coal obtained in the step five to a coal washer.

Further, the desulfurizer in the third step is prepared by uniformly mixing 10-20 parts of caustic soda, 15 parts of soda ash, 30-50 parts of quicklime, 5 parts of sodium cobalt phthalocyanine tetrasulfonate and 150 parts of water, and the raw coal is mixed with 1.5 wt% of desulfurizer.

Further, the heating temperature of the desulfurizer dissolving solution in the third step is 100-120 ℃.

Further, the coal washing water in the fourth step is prepared by mixing 10-15 parts of polyacrylamide, 10-15 parts of polyaluminium chloride and 20-30 parts of defoaming agent and adding the mixture into water according to the proportion of 50 g/L.

A desulfurization coal washing device comprises a desulfurization conveying system, a desulfurizer circulating system, a coal washing water circulating system and a drying system; the raw coal is conveyed through a desulfurization conveying system, sequentially subjected to desulfurization, cleaning and drying in the conveying process and finally enters a coal washer for treatment.

Further, the desulfurization conveying system comprises four vertical charging barrels which are sequentially arranged, namely a first vertical charging barrel, a second vertical charging barrel, a third vertical charging barrel and a fourth vertical charging barrel, wherein a pipe chain is arranged in the vertical charging barrels in a penetrating manner, and a charging tray is arranged on the pipe chain; the lower ends of the first vertical material cylinder and the second vertical material cylinder are respectively communicated with the first 180-degree steering box through flanges, the top ends of the second vertical material cylinder and the third vertical material cylinder are respectively communicated with the second 180-degree steering box through flanges, and the lower ends of the third vertical material cylinder and the fourth vertical material cylinder are respectively communicated with the third 180-degree steering box through flanges; the top ends of the first vertical material cylinder and the fourth vertical material cylinder are respectively communicated with one 90-degree steering box, and the two 90-degree steering boxes are communicated through a horizontal material cylinder.

Furthermore, a feed hopper is arranged on the outer side of the upper end part of the first vertical material barrel and communicated with the inner cavity of the first vertical material barrel; and a discharge hopper is arranged at the bottom of the horizontal charging barrel.

Further, the desulfurizer circulating system comprises a desulfurizer circulating pump, an inlet of the desulfurizer circulating pump is communicated with a desulfurizer return pipe, the desulfurizer return pipe is communicated with an inner cavity of the second vertical material cylinder, an outlet of the desulfurizer circulating pump is communicated with a desulfurizer filtering device through a pipeline, the desulfurizer filtering device is communicated with a desulfurizer storage cylinder through a pipeline, and a high-pressure heating device is installed outside the desulfurizer storage cylinder; the desulfurizer storage cylinder is communicated with one end of the desulfurizer inlet pipe, and the other end of the desulfurizer inlet pipe is communicated with the first vertical material cylinder.

Further, the coal washing water circulating system comprises a coal washing water circulating pump, an inlet of the coal washing water circulating pump is communicated with one end of a coal washing water return pipe, the other end of the coal washing water return pipe is communicated with an inner cavity of a third vertical charging barrel, an outlet of the coal washing water circulating pump is communicated with a coal washing water filtering device, the coal washing water filtering device is communicated with a coal washing water storage barrel, and the coal washing water storage barrel is communicated with a fourth vertical charging barrel through a coal washing water inlet pipe.

Further, drying system includes high temperature air-blower and air-out pipe, and the export of high temperature air-blower and air-out pipe intercommunication, air-out pipe box establish at the top of the vertical feed cylinder of fourth and be linked together with the vertical feed cylinder of fourth.

After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:

in addition, through the matching of polyacrylamide and polyaluminium chloride, impurities in coal washing water are subjected to flocculation precipitation, the flocculation effect is good, the recovery rate of coal slime can be improved, and the ash content is reduced; the desulfurization coal washing equipment can realize continuous and uninterrupted operation in the desulfurization process, improves the desulfurization efficiency, and obviously improves the desulfurization efficiency by more than 40 percent compared with the prior art; the invention is fully dried after the desulfurization and the cleaning are finished, thereby ensuring that the low-level heating value is not influenced after the coal is cleaned; in the process of desulfurization and coal cleaning, the alkaline solution and the drying system release heat, so that additional antifreezing treatment is not needed; the recovery rate of the coal slime is improved through the flocculating agent, impurities in the coal washing water are reduced, the coal washing water is recycled, the water consumption of coal washing is reduced, and the water resource is saved; the coal washing process is simple, the structural design of the coal washing equipment is reasonable, the coal washing investment can be reduced, and the coal washing cost can be controlled.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of a desulfurization coal washing apparatus;

FIG. 2 is a schematic view of the internal structure of the 180 turn tank of FIG. 1;

FIG. 3 is a schematic view showing the structure of a desulfurizing agent circulating system in FIG. 1;

FIG. 4 is a schematic diagram of the coal washing water circulation system of FIG. 1;

in the figure, 1-a desulfurization conveying system, 101-a first vertical cylinder, 102-a second vertical cylinder, 103-a third vertical cylinder, 104-a fourth vertical cylinder, 105-a first 180 DEG turn tank, 106-a second 180 DEG turn tank, 107-a third 180 DEG turn tank, 108-a 90 DEG turn tank, 109-a horizontal cylinder, 110-a feed hopper, 111-a discharge hopper, 2-a desulfurizing agent circulating system, 201-a desulfurizing agent circulating pump, 202-a desulfurizing agent filtering device, 203-a desulfurizing agent storage cylinder, 204-a desulfurizing agent inlet pipe, 205-a desulfurizing agent return pipe, 206-a high-pressure heating device, 207-a desulfurizing agent replenishing pipe, 3-a coal washing water circulating system, 301-a coal washing water circulating pump, 302-a coal washing water filtering device, 303-a coal washing water storage cylinder, 304-coal washing water inlet pipe, 305-coal washing water return pipe, 306-coal washing water supplement pipe, 4-drying system, 401-high temperature blower, 402-air outlet pipe.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.