Closed cycle coal slime steam rotary drying system

Abstract

The utility model belongs to the technical field of coal slime treatment, and particularly relates to a closed cycle coal slime steam rotary drying system which comprises a steam rotary drying machine, a spray tower, a sedimentation tank and a filter press, an exhaust port of the steam rotary dryer is communicated with an air inlet of the spray tower, and a waste liquid outlet and a liquid inlet of the spray tower are respectively communicated with the sedimentation tank; a pug outlet of the settling pond is connected with an inlet of the filter press, a pug outlet of the filter press is connected with a wet material inlet of the steam rotary dryer, and a liquid outlet of the filter press is connected with a liquid inlet of the settling pond. According to the utility model, the precipitated coal slurry is conveyed into the plate-and-frame filter press, and the part of coal slurry enters the drying system again for drying through re-filter pressing, so that closed-loop treatment of dust-containing waste gas is realized, and material waste and secondary pollution are reduced; and meanwhile, supernate subjected to filter pressing of the plate-and-frame filter press is conveyed to the spray tower through a pipeline, spray water of the spray tower can be supplemented, and water resources are saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal slime treatment, and in particular relates to a closed-circuit circulating coal slime steam rotary drying system. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The coal slime steam rotary drying system includes a screw feeder, a steam rotary dryer, a spray tower, an induced draft fan, etc. The steam rotary dryer uses steam heat source to dry the wet coal slime. The dried coal slime enters the next process, and the dusty tail gas is transported to the spray tower through a pipeline for washing treatment. The dusty wastewater discharged from the spray tower needs to be discharged manually on a regular basis, and the wastewater is sent to the factory sewer.

[0004] Since dusty wastewater contains a large amount of coal slime particles, if the dusty wastewater is discharged directly without treatment, it will not only pollute the environment to a certain extent, but also cause the loss of a large amount of coal slime, resulting in a waste of resources. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a closed-circuit circulation coal slime steam rotary drying system.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of the utility model provides a closed-circuit steam rotary drying system for coal slime, comprising: a steam rotary dryer, a spray tower, a sedimentation tank and a filter press;

[0008] The exhaust port of the steam rotary dryer is connected to the air inlet of the spray tower, and the waste liquid outlet and liquid inlet of the spray tower are respectively connected to the sedimentation tank;

[0009] The mud material outlet of the sedimentation tank is connected to the inlet of the filter press, the mud material outlet of the filter press is connected to the wet material inlet of the steam rotary dryer, and the liquid outlet of the filter press is connected to the liquid inlet of the sedimentation tank.

[0010] Furthermore, a screw feeder is provided at the wet material inlet of the steam rotary dryer.

[0011] Furthermore, the steam inlet of the steam rotary dryer is connected to a steam heat exchanger, and the steam heat exchanger is used to heat the ambient air with water vapor and then transport it to the steam rotary dryer.

[0012] Furthermore, a coal sludge pump is provided on the conveying pipeline connecting the sludge outlet of the sedimentation tank and the inlet of the filter press.

[0013] Furthermore, it also includes a dust collector, wherein the air inlet of the dust collector is connected to the exhaust port of the steam rotary dryer, and the air outlet of the dust collector is connected to the air inlet of the spray tower.

[0014] Furthermore, the dust collector is a cyclone dust collector, and a cyclone discharge valve is provided at the dust outlet of the cyclone dust collector.

[0015] Furthermore, it also includes an induced draft fan, which is connected to the top air outlet of the spray tower.

[0016] Furthermore, a circulation pump is provided on the connecting pipe between the liquid inlet of the spray tower and the sedimentation tank.

[0017] Furthermore, the filter press is a plate and frame filter press.

[0018] Furthermore, the discharge port of the steam rotary dryer is provided with a rotary discharge valve.

[0019] One or more of the above technical solutions have the following beneficial effects:

[0020] The utility model connects the sewage discharge port of the spray tower to the sedimentation tank, and uses the sedimentation tank to perform preliminary sedimentation treatment on the dust-containing wastewater; the coal slurry after sedimentation is transported to the plate and frame filter press, and this part of the coal slurry re-enters the drying system for drying through re-filtering, thereby realizing closed-loop treatment of dust-containing waste gas and reducing material waste and secondary pollution; at the same time, the supernatant after filtration by the plate and frame filter press is transported to the spray tower through a pipeline, which can replenish the spray water of the spray tower and save water resources.

[0021] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the connection relationship of a closed-loop coal slime steam rotary drying system in Example 1.

[0024] In the figure, 1. screw feeder, 2. steam rotary dryer, 3. rotary discharge valve, 4. cyclone dust collector, 5. cyclone discharge valve, 6. spray tower, 7. circulation pump, 8. sedimentation tank, 9. coal slime pump, 10. induced draft fan, 11. filter press, 12. steam heat exchanger. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Embodiment 1

[0027] like Figure 1 As shown, the utility model proposes a closed-circuit steam rotary drying system for coal slime, comprising: a steam rotary dryer 2, a spray tower 6, a sedimentation tank 8 and a filter press 11;

[0028] The exhaust port of the steam rotary dryer 2 is connected to the air inlet of the spray tower 6, and the sewage outlet and liquid inlet of the spray tower 6 are respectively connected to the sedimentation tank; the mud outlet of the sedimentation tank 8 is connected to the inlet of the filter press 11, the mud outlet of the filter press 11 is connected to the wet material inlet of the steam rotary dryer 2, and the liquid outlet of the filter press 11 is connected to the liquid inlet of the sedimentation tank 8.

[0029] The utility model utilizes a sedimentation tank to preliminarily precipitate the wastewater discharged from the spray tower, and the precipitated mud is transported to a plate and frame filter press for filter pressing treatment, and the wet coal slime after filter pressing enters a steam rotary dryer for drying treatment, so that the coal slime in the dusty flue gas can be closed-loop circulated during the treatment process, thereby reducing environmental pollution; at the same time, the filtrate after filter pressing is transported to the sedimentation tank through a pipeline, and the supernatant in the sedimentation tank is transported to the spray tower through a pipeline for use as spray water, thereby reducing the amount of supplementary water used.

[0030] As a further technical solution, the filter press 11 is a plate and frame filter press, which includes structures such as filter plates, filter frames and filter cloths, and has the advantages of large filtering driving force, clear filtrate and high solid recovery rate.

[0031] As a further technical solution, a screw feeder 1 is provided at the wet material inlet of the steam rotary dryer 2, and the screw feeder 1 can automatically transport the wet coal slime into the steam rotary dryer 2, eliminating the trouble of manual feeding and making the feeding work time-saving and labor-saving.

[0032] The discharge port of the steam rotary dryer 2 is provided with a rotary discharge valve 3, and the dried product is sent to the next process by controlling the opening of the rotary discharge valve 3.

[0033] The steam inlet of the steam rotary dryer 2 is connected to the steam heat exchanger 12 , and the steam heat exchanger 12 is used to transport the heated steam into the steam rotary dryer 2 .

[0034] The steam heat exchanger 12 is a device that uses steam as a heat source to heat water or air. It can fully replace a large amount of calorific value in the steam to heat water or air; the heated air is transported to the drying equipment for use.

[0035] As a further technical solution, a coal slurry pump 9 is provided on the conveying pipeline connecting the slurry outlet of the sedimentation tank 8 and the inlet of the filter press 11 ; the coal slurry pump 9 is used to pump the coal slurry in the sedimentation tank into the filter press 11 .

[0036] A circulation pump 7 is provided on the connecting pipe between the liquid inlet of the spray tower 6 and the sedimentation tank 8. The circulation pump 7 is used to pump the supernatant in the sedimentation tank 8 into the spray tower 6 for use as spray water.

[0037] As a further technical solution, it also includes a dust collector 4 and an induced draft fan 10. The air inlet of the dust collector 4 is connected to the exhaust port of the steam rotary dryer 2, the air outlet of the dust collector 4 is connected to the air inlet of the spray tower 6, and the bottom dust outlet of the dust collector 4 is provided with a cyclone unloading valve 5; the induced draft fan 10 is connected to the top air outlet of the spray tower 6.

[0038] The dust collector 4 is a cyclone dust collector, which is used for pre-dust removal of high-temperature flue gas and is a widely used dust removal equipment; the induced draft fan 10 generates negative pressure by rotating the impeller and is used to extract the hot flue gas in the spray tower. The dust collector and the spray tower are used to treat the dust-containing tail gas mixed with solid particles to avoid secondary pollution of the tail gas.

[0039] The working principle of the utility model is:

[0040] The wet coal slime to be dried is fed into the steam rotary dryer through a spiral feeder for drying, and the dried coal slime is transported to the next process; the dust-containing tail gas of the steam rotary dryer enters the cyclone dust collector and the spray tower in turn for purification and dust removal before being discharged; the coal slime slurry in the spray tower enters the sedimentation tank and the plate and frame filter press in turn for sedimentation and filter pressing treatment, the wet coal slime after filter pressing treatment is transported to the steam rotary dryer, the filtrate after filter pressing treatment is transported to the sedimentation tank, and the supernatant in the sedimentation tank is transported to the spray tower again for recycling, thereby realizing the recovery of energy in the process of coal slime drying.

[0041] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A closed-loop coal slime steam rotary drying system, characterized in that: include: Steam rotary dryers, spray towers, sedimentation tanks and filter presses; The exhaust port of the steam rotary dryer is connected to the air inlet of the spray tower, and the waste liquid outlet and liquid inlet of the spray tower are respectively connected to the sedimentation tank; The mud material outlet of the sedimentation tank is connected to the inlet of the filter press, the mud material outlet of the filter press is connected to the wet material inlet of the steam rotary dryer, and the liquid outlet of the filter press is connected to the liquid inlet of the sedimentation tank.

2. A closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: A screw feeder is provided at the wet material inlet of the steam rotary dryer.

3. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: The steam inlet of the steam rotary dryer is connected to a steam heat exchanger, and the steam heat exchanger is used to heat the ambient air with water vapor and then transport the heated ambient air to the steam rotary dryer.

4. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: A coal sludge pump is provided on the conveying pipeline connecting the sludge outlet of the sedimentation tank and the inlet of the filter press.

5. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: It also includes a dust collector, the air inlet of the dust collector is connected to the exhaust port of the steam rotary dryer, and the air outlet of the dust collector is connected to the air inlet of the spray tower.

6. A closed-loop coal slime steam rotary drying system according to claim 5, characterized in that: The dust collector is a cyclone dust collector, and a cyclone discharge valve is provided at the dust outlet of the cyclone dust collector.

7. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: It also includes an induced draft fan, which is connected to the top air outlet of the spray tower.

8. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: A circulation pump is arranged on the connecting pipe between the liquid inlet of the spray tower and the sedimentation tank.

9. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: The filter press is a plate and frame filter press.

10. The closed-loop coal slime steam rotary drying system according to claim 1, characterized in that: The discharge port of the steam rotary dryer is provided with a rotary discharge valve.

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