Device for continuously separating and drying gasified fine slag

Abstract

The utility model discloses a device for continuously separating, drying and gasifying fine slag, and belongs to the technical field of chemical fine slag separation treatment. The device comprises a premixing extraction tank, a stirring mixer, an ash-water separator, a filtering machine and a drying machine, the premixing extraction tank is provided with an inner cylinder and an outer cylinder, the upper part of the inner cylinder is of an open structure, and the bottom of the outer cylinder is provided with an enriched carbonaceous component outlet; the enriched carbonaceous component outlet is connected to a feed port of the stirring mixer, a mixed material outlet in the bottom of the stirring mixer is connected to the ash-water separator, a carbonaceous and extractant mixed component outlet formed in the top of the ash-water separator is connected to an inlet of the filter through a pipeline, and an ash-water separator ash-water outlet is formed in the bottom of the ash-water separator; a wet carbonaceous material outlet of the filter is connected with a material inlet of the dryer; the dryer is provided with a clean coal outlet; according to the utility model, two-stage mixing of the extraction agent and the suspended gasified fine slag material is adopted, so that the problem that the filter cake fine slag of the entrained-flow bed cannot be effectively utilized is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical fine slag separation and treatment, in particular to a device for continuously separating, drying and gasifying fine slag. Background Art

[0002] During the production process of the airflow gasifier, the liquid slag from the gasifier is quenched, broken, collected, and the coarse slag is scooped to obtain a gasification fine slag suspension. The gasification fine slag suspension is then clarified by a gasification fine slag clarification system to form a filter cake. The fine slag filter cake is disposed of as general solid waste. Since the gasification fine slag contains about 30-40% carbon, and the carbon and ash mixed filter cake has a high water content, the calorific value is low and cannot be used industrially.

[0003] At present, there are two common ways to deal with gasification fine slag. One is to use flocculation sedimentation to separate the filter cake through a belt filter. This filter cake has a high moisture content, mixed carbon and ash, and a low calorific value, and is usually disposed of as solid waste.

[0004] The second method is to use a cyclone to sort the gasification fine slag, which can only simply separate the solid mixture and water, and then use a filter press to drain the water. The filtered filter cake also has the problem of high moisture content and low calorific value, and is usually disposed of as solid waste. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art, proposes a device for continuously separating and drying gasified fine slag, and solves the problem that the fine slag of the fluidized bed filter cake cannot be effectively utilized.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0007] A device for continuously separating and drying gasified fine slag comprises a premixing extraction tank, a stirring mixer, an ash-water separator, a filter and a dryer; the premixing extraction tank is provided with an inner cylinder and an outer cylinder, the upper part of the inner cylinder is an open structure, the inner cylinder is provided with an inlet for gasified fine slag to enter the premixing extraction tank, a gaseous extractant inlet is provided on the inner cylinder and located below the inlet for gasified fine slag to enter the premixing extraction tank, a premixing extraction tank ash-water outlet connected to the outside of the premixing extraction tank is provided at the bottom of the inner cylinder, and an enriched carbonaceous component outlet is provided at the bottom of the outer cylinder; the enriched carbonaceous component outlet is connected to the feed inlet of the stirring mixer through a first pipeline, the mixed material outlet at the bottom of the stirring mixer is connected to the ash-water separator through a second pipeline, the carbonaceous and extractant mixed component outlet arranged at the top of the ash-water separator is connected to the filter inlet through a pipeline, and an ash-water separator ash-water outlet is provided at the bottom of the ash-water separator; the wet carbonaceous material outlet of the filter is connected to the material inlet of the dryer; the dryer is provided with a clean coal outlet.

[0008] Furthermore, the inlet of the gasified fine slag into the premixed extraction tank is connected to a multi-stage series pipeline mixer through a pipeline, and the multi-stage series pipeline mixer is connected to a gasified fine slag suspension feed pump and an extractant pipeline.

[0009] Furthermore, it also includes an extractant storage tank, the filter is provided with an outlet for separating liquid extractant components, the outlet for separating liquid extractant components is connected to the extractant storage tank through a pipeline, and the liquid outlet of the extractant storage tank is connected to the extractant pipeline through an extractant metering pump.

[0010] Furthermore, a gas phase outlet is provided at the top of the premix extraction tank, and the gas phase outlet is connected to the condenser. The liquid phase outlet of the condenser is connected to the extractant storage tank through a third pipeline, and the non-condensable gas discharge port of the condenser is connected to the shell side of the dryer through a fourth pipeline.

[0011] Furthermore, the dryer is provided with an outlet for evaporating the gaseous extractant, and the outlet for evaporating the gaseous extractant is connected to the inlet for the gaseous extractant via a ventilation fan.

[0012] Furthermore, the gaseous extractant inlet is connected to a gas nozzle arranged in the inner cylinder.

[0013] Furthermore, the ash water outlet of the ash water separator and the ash water outlet of the premix extraction tank are respectively connected to the gasification clarification system through pipelines.

[0014] Furthermore, both the first pipeline and the second pipeline are connected to a process pump.

[0015] Furthermore, an overflow weir is arranged at the top of the open structure on the upper part of the inner tube.

[0016] The beneficial effects of the utility model compared with the prior art are:

[0017] The utility model can be applied to the sorting and processing of coal chemical gasification fine slag, can realize the separation of coal and oil, obtain clean coal products with extremely low water content, and at the same time, oil extractants can be recovered, thereby reducing production costs.

[0018] The utility model adopts two-stage mixing of the extractant and the suspended gasified fine slag material, which can solve the problem of separating the carbonaceous and ash contents in the gasified fine slag and obtain a carbonaceous powder product with extremely low water content. At the same time, the extractant is recycled to reduce production costs.

[0019] The production system of the utility model has the characteristics of continuous, safe and efficient operation. Materials are all transmitted in closed equipment, there is no risk of environmental escape of the extractant, the degree of automation is high, and it is suitable for the separation process of hydrophobic powder and hydrophilic impurities.

[0020] The utility model integrates gasification fine slag impurity separation and drying, has high integration, and the extractant is recycled and reused. It also ingeniously realizes the thermodynamic balance problem of the system and reduces power consumption.

[0021] The utility model has a carbon component recovery rate of more than 90% for gasified fine slag, and the content of extractant in the gasified fine slag is less than 1%. The extractant can be recycled in the system, reducing the separation cost of powder mixed materials, and can achieve the dehydration effect of gasified fine slag, thereby improving the quality of the product.

[0022] The utility model device is safe and reliable, suitable for processing diverse raw materials, and has the advantages of being promoted in the fields of coal mines, metal mines, coal chemical gasification waste slag, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the position of the device for continuously separating and drying gasified fine slag in the utility model in the existing gasified fine slag clarification system.

[0024] Figure 2 It is a schematic diagram of the connection structure of the continuous separation, drying and gasification fine slag device of the utility model.

[0025] In the figure:

[0026] 1-gasification fine slag suspension feed pump, 2-extractant pipeline, 7-gasification fine slag premixed extraction tank inlet, 8-premixed extraction tank ash water outlet, 9-enriched carbonaceous component outlet, 10-gaseous extractant inlet, 11-gas phase outlet, 12-overflow weir, 13-first pipeline, 17-mixed material outlet, 18-second pipeline, 19-carbonaceous and extractant mixed component outlet, 20-ash water separator ash water outlet, 22-separated liquid extractant component outlet, 23-wet carbonaceous material outlet Port, 27-evaporation gaseous extractant outlet, 28-fourth pipeline, 31-clean coal outlet, 32-third pipeline, 35-extractant metering pump, 36-condenser, 38-non-condensable gas discharge port, 100-premix extraction tank, 101-inner cylinder, 102-outer cylinder, 200-stirring mixer, 300-ash-water separator, 400-filter, 500-dryer, 600-pipeline mixer, 700-extractant storage tank, 800-ventilation fan, 900-gasification clarification system. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0028] See also Figure 1This embodiment proposes a device for continuously separating and drying gasified fine slag, which includes a premixed extraction tank 100, a stirring mixer 200, an ash-water separator 300, a filter 400 and a dryer 500; the premixed extraction tank 100 is provided with an inner cylinder 101 and an outer cylinder 102, the upper part of the inner cylinder 101 is an open structure, and an overflow weir 12 is arranged on the top of the open structure of the upper part of the inner cylinder 101; the inner cylinder 101 is provided with an inlet 7 for gasified fine slag to enter the premixed extraction tank, and a gaseous extractant inlet 10 is arranged on the inner cylinder 101 and located below the inlet 7 for gasified fine slag to enter the premixed extraction tank, and the gaseous extractant inlet 10 is connected to a gas nozzle arranged in the inner cylinder 101. The bottom of the inner cylinder 101 is provided with a premixed extraction tank ash-water outlet 8 connected to the outside of the premixed extraction tank 100, and the bottom of the outer cylinder 102 is provided with an enriched carbonaceous component outlet 9. The inlet 7 of the gasified fine slag into the premixed extraction tank is connected to a two-stage series pipeline mixer 600 through a pipeline. The two-stage series pipeline mixer 600 is connected to the gasified fine slag suspension feed pump 1 and the extractant pipeline 2.

[0029] The enriched carbonaceous component outlet 9 is connected to the feed port of the stirring mixer 200 through the first pipeline 13, the mixed material outlet 17 at the bottom of the stirring mixer 200 is connected to the ash-water separator 300 through the second pipeline 18, the carbonaceous and extractant mixed component outlet 19 arranged at the top of the ash-water separator 300 is connected to the inlet of the filter 400 through a pipeline, and the ash-water separator 300 is provided with an ash-water outlet 20; the wet carbonaceous material outlet 23 of the filter 400 is connected to the material inlet of the dryer 500; the dryer 500 is provided with a clean coal outlet 31.

[0030] The filter 400 is provided with a separated liquid extractant component outlet 22, which is connected to the extractant storage tank 700 through a pipeline, and the liquid outlet of the extractant storage tank 700 is connected to the extractant pipeline 2 through the extractant metering pump 35. The liquid extractant separated by the filter 400 enters the extractant storage tank 700 and is sent to the pipeline mixer 600 to be mixed with the gasified fine slag suspension for fine slag extraction.

[0031] The top of the premix extraction tank 100 is provided with a gas phase outlet 11, which is connected to the condenser 36. The liquid phase outlet of the condenser 36 is connected to the extractant storage tank 700 through the third pipeline 32, that is, the volatilized gas phase extractant in the premix extraction tank 100 is further recovered to the extractant storage tank 700 after condensation, and can be utilized. The non-condensable gas discharge port 38 of the condenser 36 is connected to the shell side of the dryer 500 through the fourth pipeline 28, that is, the heat of the non-condensable gas is utilized by the dryer 500.

[0032] The dryer 500 is provided with an evaporated gaseous extractant outlet 27, which is connected to the gaseous extractant inlet 10 via a ventilation fan 800. The gaseous extractant remaining in the dryer 500 enters the premix extraction tank 100 and is fully utilized again.

[0033] The ash water outlet 20 of the ash water separator and the ash water outlet 8 of the premix extraction tank are respectively connected to the gasification clarification system 900 through pipelines. The cleaned ash water is discharged from the ash water outlet 20 of the ash water separator and the ash water outlet 8 of the premix extraction tank, and this part of the ash water enters the conventional gasification clarification system 900 for treatment. The first pipeline 13 and the second pipeline 18 are both connected to a process pump.

[0034] See also Figure 2 In the existing device, the slag dehydration bin is connected to the gasification clarification system 900 for treatment through an ash water discharge pump. After the improvement of this embodiment, a gasification fine slag booster pump is added after the ash water discharge pump, and the gasification fine slag is introduced into the device for continuous separation and drying of gasification fine slag proposed in this embodiment for treatment, and the bottom ash and clean coal are separated, and the cleaned ash water enters the gasification clarification system 900 for treatment.

[0035] The working principle of the device for continuous separation, drying and gasification of fine slag described in this embodiment is as follows:

[0036] After the gasified fine slag mixed liquid at the outlet of the second-stage pipeline mixer 600 enters the premixed extraction tank 100, it contacts the gaseous extractant from the dryer 500 in reverse direction in the premixed extraction tank 100. The gaseous extractant condenses when it is cooled and combines with the carbonaceous components and then floats up. The floating and enriched carbonaceous components enter the outer cylinder 102 along the overflow weir 12 set in the inner cylinder 101 of the premixed extraction tank 100, and flow out of the premixed extraction tank 100 through the enriched carbonaceous component outlet 9 after buffering and collection. The gasified fine slag suspension entering the upper part of the premixed extraction tank 100, under the action of the extractant, the enriched ash settles to the bottom of the inner cylinder 101 of the premixed extraction tank 100 by gravity, and the ash water is discharged to the gasification clarification system 900 through the ash water outlet 8 of the premixed extraction tank.

[0037] The mixed liquid from the outlet 9 of the enriched carbonaceous component is pressurized by the process pump and enters the stirring mixer 200, where it is stirred, mixed and dispersed with the washing water again. This process has the effect of reducing the ash content of the carbon-rich component. The stirring mixer 200 is provided with an inlet for enriched carbonaceous components, an inlet for washing water, a nitrogen replacement port, a safety valve outlet, and an outlet for a mixed liquid of enriched carbonaceous components + washing water. The nitrogen replacement port is used as air replacement during the start-up and shutdown of the equipment to ensure that the production is carried out under anaerobic conditions; the safety valve outlet is a protective measure to prevent the equipment from being over-pressurized. The impeller of the stirring mixer uses blade-type blades and the electrode uses a variable frequency explosion-proof motor to ensure that the stirring speed is adjustable.

[0038] The enriched carbonaceous component and the washing water in the stirring mixer 200 are stirred at high speed in the tank body, so that the extractant, carbonaceous component and washing water are mixed vigorously to form a highly turbulent mixture, which is then pumped into the ash water separator 300 through another process pump. The ash water separator 300 is a vertical device, and the extractant, carbonaceous component and washing water mixing inlets, the enriched carbonaceous component outlet and the ash + water separation outlet are arranged on the device. After the medium mixed in the stirring mixer 200 enters the extractant + carbonaceous component + washing water mixing inlet on the ash water separator 300 through the process pump, it is layered according to the density of the medium, and the enriched carbonaceous component floats to the upper part of the ash water separator 300 and flows out of the ash water separator 300 through the enriched carbonaceous component outlet; the washing water and the remaining ash impurities settle to the bottom of the ash water separator equipment due to the density difference, and are discharged to the gasification slag water clarification system through the ash + water separation outlet.

[0039] The enriched carbonaceous component enters the filter 400 through the ash-water separator 300. The separation function of the filter 400 is to separate the enriched carbonaceous component through the filter to filter out the carbonaceous component wet material and separate the extractant liquid. The extractant liquid separated by the filter 400 flows to the extractant storage tank 700 through the pipeline; the enriched carbonaceous component wet material separated by the filter 400 enters the dryer 500 for further drying and processing of the enriched carbonaceous component wet material.

[0040] The extractant liquid separated by the filter 400 is buffered in the extractant storage tank 700, and the collected extractant is connected to the inlet port of the first-stage pipeline mixer 600 by means of an extractant metering pump. The gasified fine slag and the extractant enter the pipeline mixer 600 together for strong mixing. Through the joint action of the first and second-stage pipeline mixers 600, the carbon-containing components in the gasified fine slag and the extractant are effectively adsorbed and fused, thereby improving the separation effect of the carbonaceous components and ash impurities.

[0041] After the wet material of the enriched carbonaceous component separated by the filter 400 enters the dryer 500, the drying process of the wet material of the enriched carbonaceous component is completed in the dryer 500. The dryer 500 is a closed drying equipment. In this project, a paddle dryer is used. The dryer consists of an equipment shell, blades, a sealing structure, and a driving motor. The equipment body is provided with an inlet for the wet material of the enriched carbonaceous component, an outlet for the gaseous extractant, an outlet for the dried carbonaceous component, and an inlet and outlet for the heating medium of the dryer. The blade shaft end seal adopts a nitrogen sealing method.

[0042] The shell and blades of the dryer 500 are jacketed structures. 0.5MPa steam is introduced into the shell and blade jackets. After the heating medium heats the material, the steam turns into condensate and is discharged from the system through the heating medium outlet.

[0043] The carbonaceous wet material enriched in the dryer 500 is indirectly heated by steam, and the extractant is evaporated by heat. Then, the material enters the premixed extraction tank 100 under the suction force of the ventilation fan 800 provided at the gaseous extractant outlet of the dryer. The gaseous extractant directly exchanges heat with the gasified fine slag and condenses in the premixed extraction tank 100. The gaseous extractant condenses into liquid and adsorbs and fuses with the carbonaceous components of the gasified fine slag. The gaseous extractant gradually floats up in the inner cylinder of the premixed extraction tank, flows to the buffer part of the premixed extraction tank through the overflow weir 12, and then enters the process pump to be pressed to the stirring mixer 200, thereby forming a closed-loop circulation of the medium.

[0044] The gaseous extractant and inert gas components evaporated by the dryer 500 are directly heat-exchanged with the gasified fine slag through premixed extraction, and the uncondensed extractant and inert gas components enter the water cooler through the gas phase outlet at the top of the premixed extraction tank for condensation and separation of the extractant. The condensed liquid extractant flows into the extractant storage tank 700 and is then used again for recycling. The utility model can realize the separation of metal and non-metal powder minerals and impurities, obtain powder minerals with extremely low water content, and at the same time, the extractant is recycled to reduce production costs; it solves the task of purifying metal and non-metal hydrophobic minerals and impurities.

[0045] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A device for continuously separating dry gasified fine slag, characterized in that: The invention comprises a premix extraction tank (100), a stirring mixer (200), an ash-water separator (300), a filter (400) and a dryer (500); the premix extraction tank (100) is provided with an inner cylinder (101) and an outer cylinder (102); the upper portion of the inner cylinder (101) is an open structure; the inner cylinder (101) is provided with an inlet (7) for gasified fine slag to enter the premix extraction tank; a gaseous extractant inlet (10) is provided on the inner cylinder (101) and below the inlet (7) for gasified fine slag to enter the premix extraction tank; a premix extraction tank ash-water outlet (8) connected to the outside of the premix extraction tank (100) is provided at the bottom of the inner cylinder (101); and a carbonaceous component enrichment outlet (102) is provided at the bottom of the outer cylinder (102). The outlet (9) of the enriched carbonaceous component is connected to the feed inlet of the stirring mixer (200) through a first pipeline (13); the mixed material outlet (17) at the bottom of the stirring mixer (200) is connected to the ash-water separator (300) through a second pipeline (18); the carbonaceous and extractant mixed component outlet (19) arranged at the top of the ash-water separator (300) is connected to the inlet of the filter (400) through a pipeline; the ash-water separator ash water outlet (20) is arranged at the bottom of the ash-water separator (300); the wet carbonaceous material outlet (23) of the filter (400) is connected to the material inlet of the dryer (500); and the dryer (500) is provided with a clean coal outlet (31).

2. The device for continuously separating and drying gasified fine slag according to claim 1, characterized in that: The inlet (7) of the gasified fine slag into the premixed extraction tank is connected to a multi-stage series pipeline mixer (600) through a pipeline, and the multi-stage series pipeline mixer (600) is connected to a gasified fine slag suspension feed pump (1) and an extractant pipeline (2).

3. The device for continuously separating and drying gasified fine slag according to claim 2, characterized in that: The invention also comprises an extractant storage tank (700), the filter (400) is provided with an outlet (22) for separating liquid extractant components, the outlet (22) for separating liquid extractant components is connected to the extractant storage tank (700) via a pipeline, and the liquid outlet of the extractant storage tank (700) is connected to the extractant pipeline (2) via an extractant metering pump (35).

4. The device for continuously separating and drying gasified fine slag according to claim 3, characterized in that: A gas phase outlet (11) is provided at the top of the premix extraction tank (100), and the gas phase outlet (11) is connected to the condenser (36). The liquid phase outlet of the condenser (36) is connected to the extractant storage tank (700) via a third pipeline (32), and the non-condensable gas discharge port (38) of the condenser (36) is connected to the shell side of the dryer (500) via a fourth pipeline (28).

5. The device for continuously separating and drying gasified fine slag according to claim 1, characterized in that: The dryer (500) is provided with an evaporated gaseous extractant outlet (27), and the evaporated gaseous extractant outlet (27) is connected to the gaseous extractant inlet (10) via a ventilation fan (800).

6. The device for continuously separating and drying gasified fine slag according to claim 1 or 5, characterized in that: The gaseous extractant inlet (10) is connected to a gas nozzle arranged in the inner cylinder (101).

7. The device for continuously separating and drying gasified fine slag according to claim 1, characterized in that: The ash water outlet (20) of the ash water separator and the ash water outlet (8) of the premix extraction tank are respectively connected to the gasification clarification system (900) through pipelines.

8. The device for continuously separating and drying gasified fine slag according to claim 1, characterized in that: Both the first pipeline (13) and the second pipeline (18) are connected to a process pump.

9. The device for continuously separating and drying gasified fine slag according to claim 1, characterized in that: An overflow weir (12) is provided at the top of the open structure at the upper part of the inner cylinder (101).

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