DCC slurry treatment device for coal chemical industry

Abstract

The utility model discloses a DCC (dicyclohexylcarbodiimide) slurry treatment device for coal chemical industry, which solves the problem of environmental pollution caused by the DCC slurry at present, after the DCC slurry is conveyed to a clarification tank through a pipeline, impurities in the DCC slurry are removed through coagulating sedimentation, after the DCC slurry enters an aeration oxidation tank to form ammonium sulfate slurry, the DCC slurry is conveyed to a multi-stage evaporation component through a conveying pump to be evaporated and crystallized, and the DCC slurry is discharged from a discharge port. After the solid content and the density of the ammonium sulfate slurry are further improved, ammonium sulfate is separated and dried and packaged in an ammonium sulfate drying and packaging section, the device realizes efficient and low-cost treatment of the coal chemical industry DCC slurry, process switching and adjustment can be carried out according to the production operation condition, the production rate of the DCC slurry ammonium sulfate product is improved, and the production cost is reduced. The daily maintenance cost of equipment and facilities is effectively reduced, the national environment protection call is actively responded, and the pollution of DCC slurry, dust and the like to the environment and the harm to human health are effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a coal chemical DCC slurry processing device. Background Art

[0002] The newly built desulfurization system of the 1.5 million tons / year catalytic cracking DCC (dicyclohexylcarbodiimide) ethylene production unit adopts the ammonia desulfurization process technology of China United Engineering Corporation. The flue gas desulfurization system adopts the ammonia absorption method: it absorbs SO2 in the flue gas to form ammonium sulfite solution, which is oxidized into ammonium sulfate solution by the air blown into the bottom of the absorption tower. When the density of the ammonium sulfate solution reaches 1170kg / m3, it is discharged to the horizontal flow tank for natural precipitation, removing most of the catalyst sludge in the slurry, and the supernatant overflows to the vertical flow tank for further precipitation. The clear liquid is returned to the buffer tank and is pumped to the public engineering desulfurization device for treatment by regularly starting the ammonium sulfate discharge pump.

[0003] The ammonium sulfate slurry of the DCC unit desulfurization system is designed to be sent to the thermal power station desulfurization unit for treatment, with a design density greater than 1230kg / m3, and the current receiving density is 1170kg / m3. Due to the particularity of the DCC unit process and medium, the ammonium sulfate slurry contains certain catalysts, oil, etc., which leads to the thermal power station desulfurization unit in the process of treating DCC ammonium sulfate slurry. There are problems such as small ammonium sulfate crystal particles, poor absorption effect, high temperature in the tower, and increased slurry density, which makes it difficult to control environmental protection indicators, chimney tailing, and long-term post-processing discharge difficulties, which seriously affects the safe and stable operation of the thermal power station desulfurization unit. Utility Model Content

[0004] In view of the above-mentioned problems, the purpose of the utility model is to provide a coal chemical DCC slurry processing device.

[0005] The technical solution of the utility model is: a coal chemical DCC slurry processing device, comprising:

[0006] The coagulation and sedimentation section includes a clarification tank and a dosing device, wherein the clarification tank is used to receive external DCC slurry, and the dosing device is used to add reagents into the clarification tank to cause the DCC slurry in the clarification tank to undergo coagulation and sedimentation;

[0007] The oxidation section includes an aeration oxidation tank and an oxidation fan. The aeration oxidation tank is connected to the clarification tank and is used to receive the DCC slurry transmitted from the clarification tank. The oxidation fan is used to introduce oxygen into the aeration oxidation tank to oxidize the DCC slurry.

[0008] The evaporation section includes a delivery pump and a multi-stage evaporation component. The delivery pump is connected to the aeration oxidation tank and the multi-stage evaporation component respectively, and is used to deliver the DCC slurry in the aeration oxidation tank to the multi-stage evaporation component. The multi-stage evaporation component is used to perform multi-stage evaporation on the DCC slurry to adjust the solid content and density of the DCC slurry.

[0009] The ammonium sulfate drying and packaging section comprises an ammonium sulfate solution tank, a cyclone, a centrifuge, a vibrating fluidized bed and a dust treatment device which are connected in sequence. The ammonium sulfate solution tank is connected to the output end of the multi-stage evaporation component and is used to receive the DCC slurry and react. The cyclone and the centrifuge are respectively used to separate the liquid after the reaction. The vibrating fluidized bed is used to carry out resource treatment on the separated slurry and output the ammonium sulfate product. The dust treatment device is used to post-treat the dust generated by the vibrating fluidized bed.

[0010] Furthermore, the dosing device includes a PAC dosing device and a PAM dosing device.

[0011] Furthermore, a circulation pump is provided at the bottom of the aeration oxidation pond, and the circulation pump is used to circulate the DCC slurry in the aeration oxidation pond.

[0012] Furthermore, the cyclone and the centrifuge are respectively connected to the aeration oxidation tank through a first pipeline, so as to transport the supernatant obtained from the cyclone and the centrifuge to the aeration oxidation tank.

[0013] Furthermore, the multi-stage evaporation assembly comprises:

[0014] A primary evaporation effect body connected to the delivery pump;

[0015] A secondary evaporation effect body connected to the primary evaporation effect body;

[0016] A third-level evaporation effect body connected to the second-level evaporation effect body;

[0017] The first-stage evaporation effect, the second-stage evaporation effect and the third-stage evaporation effect are all connected to an external steam network to obtain steam.

[0018] Furthermore, the delivery pump is also connected to the secondary evaporation effect body and the tertiary evaporation effect body respectively through a second pipeline;

[0019] The outlet of the third-stage evaporation effect body is connected to the inlet of the first-stage evaporation effect body through a third pipeline.

[0020] Furthermore, the output end of the vibrating fluidized bed is connected to a silo and a packaging machine in sequence, the silo is used to receive the large particle materials output by the vibrating fluidized bed, and the packaging machine is used to package the large particle materials.

[0021] Furthermore, the dust treatment device comprises:

[0022] A cyclone separator is connected to the vibrating fluidized bed and the silo respectively, and is used to separate the dust output by the vibrating fluidized bed and send the separated large particle materials into the silo;

[0023] An induced draft fan connected to the cyclone separator;

[0024] The washing tower is connected to the induced draft fan, and the induced draft fan is used to send the dust separated by the cyclone separator into the washing tower for washing, and the washed gas is discharged through the dust discharge port of the washing tower.

[0025] The process method and beneficial effects of the utility model: the utility model provides a coal chemical DCC slurry processing device, which solves the current problem of DCC slurry polluting the environment. After the DCC slurry is transported to the clarification tank through a pipeline, the impurities in the DCC slurry are removed by coagulation and sedimentation. After entering the aeration oxidation tank to form ammonium sulfate slurry, the DCC slurry is transported to the multi-stage evaporation component for evaporation and crystallization by a delivery pump. After the solid content and density of the ammonium sulfate slurry are further increased, the ammonium sulfate is separated and dried and packaged in the ammonium sulfate drying and packaging section. The utility model realizes a device for efficient and low-cost treatment of coal chemical DCC slurry, which can switch and adjust the process according to the production and operation conditions, improve the production rate of DCC slurry ammonium sulfate products, effectively reduce the daily maintenance costs of equipment and facilities, and actively respond to the national environmental protection call, effectively reducing the pollution of DCC slurry, dust, etc. to the environment and the harm to human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] Among them, 1-clarification tank; 2-aeration oxidation tank; 3-oxidation fan; 4-circulation pump; 5-transport pump; 6-first-stage evaporation effect; 7-second-stage evaporation effect; 8-third-stage evaporation effect; 9-ammonium sulfate solution tank; 10-cyclone; 11-centrifuge; 12-vibrating fluidized bed; 13-silo; 14-packaging machine; 15-cyclone separator; 16-induced draft fan; 17-washing tower; 18-dust discharge port; 19-first pipeline, 20-second pipeline, 21-third pipeline. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1, the specific implementation methods of the utility model are described in detail. In the description of the utility model, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0030] It should be noted that the circuit connections involved in the present invention all adopt conventional circuit connection methods and do not involve any innovation.

[0031] Example: Figure 1 As shown, a coal chemical DCC slurry processing device comprises:

[0032] The coagulation and sedimentation section includes a clarification tank 1 and a dosing device. The clarification tank 1 is used to receive external DCC slurry. The dosing device is used to add reagents into the clarification tank 1 to make the DCC slurry in the clarification tank 1 coagulate and sediment. The dosing device includes a PAC dosing device and a PAM dosing device.

[0033] The oxidation section includes an aeration oxidation tank 2 and an oxidation fan 3. The aeration oxidation tank 2 is connected to the clarification tank 1 and is used to receive the DCC slurry transmitted from the clarification tank 1. The oxidation fan 3 is used to introduce oxygen into the aeration oxidation tank 2 to oxidize the DCC slurry. A circulation pump 4 is provided at the bottom of the aeration oxidation tank 2. The circulation pump 4 is used to circulate the DCC slurry in the aeration oxidation tank 2.

[0034] The evaporation section includes a delivery pump 5 and a multi-stage evaporation component. The delivery pump 5 is connected to the aeration oxidation pond 2 and the multi-stage evaporation component respectively, and is used to deliver the DCC slurry in the aeration oxidation pond 2 to the multi-stage evaporation component. The multi-stage evaporation component is used to perform multi-stage evaporation on the DCC slurry to adjust the solid content and density of the DCC slurry. The multi-stage evaporation component includes a primary evaporation effect 6, a secondary evaporation effect 7, and a tertiary evaporation effect 8; the primary evaporation effect 6 is connected to the delivery pump 5; the secondary evaporation effect 7 is connected to the primary evaporation effect 6; the tertiary evaporation effect 8 is connected to the secondary evaporation effect 7 ... The evaporation effect body 6, the secondary evaporation effect body 7, and the tertiary evaporation effect body 8 are all connected to the external steam network for obtaining steam; the delivery pump 5 is also connected to the secondary evaporation effect body 7 and the tertiary evaporation effect body 8 through the second pipeline 20; the outlet of the tertiary evaporation effect body 8 is connected to the inlet of the primary evaporation effect body 6 through the third pipeline 21, and when the primary evaporation effect body 6 or the secondary evaporation effect body 7 fails, it can directly enter the tertiary evaporation effect body 8 through the second pipeline 20; when the solid content of the discharge of the tertiary evaporation effect body 8 does not reach 10-15%, it directly enters the primary evaporation effect body 6 through the third pipeline 21;

[0035] The ammonium sulfate drying and packaging section includes an ammonium sulfate solution tank 9, a cyclone 10, a centrifuge 11, a vibrating fluidized bed 12 and a dust treatment device which are connected in sequence. The ammonium sulfate solution tank 9 is connected to the output end of the multi-stage evaporation component to receive the DCC slurry and react. The cyclone 10 and the centrifuge 11 are respectively used to separate the liquid after the reaction. The vibrating fluidized bed 12 is used to carry out resource treatment on the separated slurry and output the ammonium sulfate product. The dust treatment device is used to post-treat the dust generated by the vibrating fluidized bed 12. The output end of the vibrating fluidized bed 12 is connected in sequence with a silo 13 and a packaging machine 14. The silo 13 is used to receive the large particle material output by the vibrating fluidized bed 12. The packaging machine 14 is used to crush the large particle material. The dust treatment device includes a cyclone separator 15, an induced draft fan 16 and a washing tower 17; the cyclone separator 15 is connected to the vibrating fluidized bed 12 and the silo 13 respectively, and is used to separate the dust output by the vibrating fluidized bed 12, and send the separated large particle materials into the silo 13; the induced draft fan 16 is connected to the cyclone separator 15; the washing tower 17 is connected to the induced draft fan 16, and the induced draft fan 16 is used to send the dust separated by the cyclone separator 15 into the washing tower 17 for washing, and the washed gas is discharged through the dust discharge port 18 of the washing tower 17. The cyclone 10 and the centrifuge 11 are respectively connected to the aeration oxidation tank 2 through the first pipeline 19, and are used to transport the supernatant obtained by the cyclone 10 and the centrifuge 11 to the aeration oxidation tank 2.

[0036] The process method of the above embodiment is as follows: after the DCC slurry is transported to the clarification tank 1 through a pipeline, impurities in the DCC slurry are removed by coagulation and sedimentation, and then the DCC slurry enters the aeration oxidation tank 2 to form ammonium sulfate slurry, and then the DCC slurry is transported to the multi-stage evaporation assembly for evaporation and crystallization through the delivery pump 5. After the solid content and density of the ammonium sulfate slurry are further increased, the ammonium sulfate is separated in the ammonium sulfate drying and packaging section and dried and packaged.

[0037] The specific models of the above electronic components are not specially specified, and ordinary products available on the market can be selected as long as they can meet the use requirements of the utility model.

[0038] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A coal chemical DCC slurry processing device, characterized in that: include: The coagulation and sedimentation section comprises a clarification tank (1) and a dosing device, wherein the clarification tank (1) is used to receive external DCC slurry, and the dosing device is used to add a reagent into the clarification tank (1) to cause the DCC slurry in the clarification tank (1) to undergo coagulation and sedimentation; The oxidation section comprises an aeration oxidation tank (2) and an oxidation blower (3), wherein the aeration oxidation tank (2) is connected to the clarification tank (1) and is used to receive the DCC slurry transmitted by the clarification tank (1), and the oxidation blower (3) is used to introduce oxygen into the aeration oxidation tank (2) to oxidize the DCC slurry; The evaporation section comprises a delivery pump (5) and a multi-stage evaporation component. The delivery pump (5) is connected to the aeration oxidation pond (2) and the multi-stage evaporation component respectively, and is used to deliver the DCC slurry in the aeration oxidation pond (2) to the multi-stage evaporation component. The multi-stage evaporation component is used to perform multi-stage evaporation on the DCC slurry to adjust the solid content and density of the DCC slurry. The ammonium sulfate drying and packaging section comprises an ammonium sulfate solution tank (9), a cyclone (10), a centrifuge (11), a vibrating fluidized bed (12) and a dust treatment device which are connected in sequence. The ammonium sulfate solution tank (9) is connected to the output end of the multi-stage evaporation component and is used to receive DCC slurry and react. The cyclone (10) and the centrifuge (11) are used to separate the liquid after the reaction. The vibrating fluidized bed (12) is used to perform resource treatment on the separated slurry and produce an ammonium sulfate product. The dust treatment device is used to post-treat the dust generated by the vibrating fluidized bed (12).

2. A coal chemical DCC slurry processing device according to claim 1, characterized in that: The dosing device includes a PAC dosing device and a PAM dosing device.

3. A coal chemical DCC slurry processing device according to claim 1, characterized in that: A circulation pump (4) is provided at the bottom of the aeration oxidation pond (2), and the circulation pump (4) is used to circulate the DCC slurry in the aeration oxidation pond (2).

4. A coal chemical DCC slurry processing device as claimed in claim 1, characterized in that: The cyclone (10) and the centrifuge (11) are respectively connected to the aeration oxidation pond (2) through a first pipeline (19) for conveying the supernatant obtained from the cyclone (10) and the centrifuge (11) to the aeration oxidation pond (2).

5. A coal chemical DCC slurry processing device as claimed in claim 1, characterized in that: The multi-stage evaporation assembly comprises: A primary evaporation effect body (6) connected to the delivery pump (5); A secondary evaporation effect body (7), connected to the primary evaporation effect body (6); A third-level evaporation effect body (8) connected to the second-level evaporation effect body (7); The first-stage evaporation effect (6), the second-stage evaporation effect (7), and the third-stage evaporation effect (8) are all connected to an external steam network to obtain steam.

6. A coal chemical DCC slurry processing device as claimed in claim 5, characterized in that: The delivery pump (5) is also connected to the secondary evaporation effect (7) and the tertiary evaporation effect (8) respectively through a second pipeline (20); The outlet of the third-stage evaporation effect (8) is connected to the inlet of the first-stage evaporation effect (6) through a third pipeline (21).

7. A coal chemical DCC slurry processing device according to claim 1, characterized in that: The output end of the vibrating fluidized bed (12) is connected in sequence to a silo (13) and a packaging machine (14); the silo (13) is used to receive the large particle material output by the vibrating fluidized bed (12); and the packaging machine (14) is used to package the large particle material.

8. A coal chemical DCC slurry processing device as claimed in claim 7, characterized in that: The dust treatment device comprises: A cyclone separator (15) is connected to the vibrating fluidized bed (12) and the silo (13) respectively, and is used to separate the dust output from the vibrating fluidized bed (12) and send the separated large particle materials into the silo (13); An induced draft fan (16) connected to the cyclone separator (15); The washing tower (17) is connected to the induced draft fan (16). The induced draft fan (16) is used to send the dust separated by the cyclone separator (15) into the washing tower (17) for washing. The washed gas is discharged through the dust discharge port (18) of the washing tower (17).

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