Heat recycling system

Abstract

The utility model relates to the technical field of humic acid production, in particular to a heat recycling system. The heat recycling system comprises a negative pressure feeding device and an alkali liquor preparation kettle, the negative pressure feeding device is connected with a raw material dryer through a pulverizer, a vibrating screen is arranged below the raw material dryer, the vibrating screen is connected with a stock bin through a middle bin, the stock bin is connected with a centrifugal machine through a reaction kettle, and the centrifugal machine is connected with a drying device through a filter. A heating coil pipe is arranged in the raw material dryer; and the alkali liquor preparation kettle is connected with the heating coil pipe through a pipeline entering the heating coil pipe. According to the system, through the arrangement of the raw material dryer, heat generated in the alkali liquor preparation kettle is introduced into the raw material dryer, the raw material drying efficiency is greatly improved, and the production process is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of humic acid production, in particular to a heat recovery and utilization system. Background Art

[0002] Humic acid is an organic substance widely found in soil, sediment and coal, and has many uses, including soil improvement, fertilizer, environmental protection, etc. The production process of humic acid usually involves chemical reactions under high temperature and pressure, which generate a lot of heat. In the traditional production process, this heat is often directly discharged into the environment, which not only wastes energy, but also may cause thermal pollution to the environment.

[0003] In workshop production, humic acid and sulfuric acid react in an exothermic reaction kettle. Most of the heat released by the reaction is released directly. After the reaction is completed, the waste acid liquid generated is mostly neutralized with alkali solution. The reaction of quicklime and water will generate a lot of heat. Both of the above heat are used in the device, resulting in low heat utilization. And when humic acid is screened, there will be a problem of low filtration efficiency due to excessive moisture, which seriously affects the production progress. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a heat recovery and utilization system. Through the setting of a raw material dryer, the heat generated in the alkali solution preparation kettle is introduced into the raw material dryer, which greatly improves the drying efficiency of the raw materials and speeds up the production process; through the setting of a gas-liquid heat exchanger, the excess heat generated by the reactor is introduced into the gas-liquid heat exchanger to heat the gas entering the drying device, thereby improving the heat utilization rate and greatly improving the drying efficiency.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The heat recovery and utilization system comprises a negative pressure feeding device and an alkali solution preparation kettle. The negative pressure feeding device is connected to a raw material dryer through a pulverizer. A vibrating screen is arranged below the raw material dryer. The vibrating screen is connected to a silo through an intermediate bin. The silo is connected to a centrifuge through a reaction kettle. The centrifuge is connected to a drying device through a filter. A heating coil is arranged inside the raw material dryer. The alkali solution preparation kettle is connected to the heating coil through a heating coil inlet pipe.

[0007] After the acid liquid is filtered through the filter, part of it is recovered and part of it enters the neutralization tank for acid-base neutralization reaction treatment.

[0008] A material guide plate is arranged inside the raw material dryer, and a material guide edge and a material discharge hole are arranged on the material guide plate. A heating coil outlet pipe is connected to the heating coil.

[0009] The reactor is provided with a reactor heat exchange jacket on the outside, the reactor heat exchange jacket is connected with an auger, the reactor heat exchange jacket is connected with the gas-liquid heat exchanger through the gas-liquid heat exchanger inlet pipeline, and the reactor heat exchange jacket is connected with the reactor heat exchange jacket inlet pipeline.

[0010] The gas-liquid heat exchanger is connected to a gas-liquid heat exchanger outlet pipe, the gas-liquid heat exchanger is connected to the drying device through a drying device inlet pipe, and the gas-liquid heat exchanger is connected to a gas-phase gas-liquid heat exchanger inlet pipe. The gas-liquid heat exchanger is used for heat exchange between gas and liquid phases.

[0011] An auger is arranged between the silo and the reactor, and the filter is connected to the neutralization tank through a pipeline.

[0012] The outer side of the alkali solution configuration kettle is provided with an alkali solution configuration kettle heat exchange jacket, and the alkali solution configuration kettle heat exchange jacket is connected with the heating coil inlet pipeline.

[0013] The alkali solution configuration kettle heat exchange jacket is connected with an alkali solution configuration kettle heat exchange jacket inlet pipeline, and the alkali solution configuration kettle heat exchange jacket is connected with the neutralization tank through the pipeline.

[0014] The working principle of the utility model is:

[0015] The humic acid raw material enters the pulverizer through the negative pressure feeding device for pulverization, and then after being dried in the raw material dryer, it falls onto the vibrating screen for screening. The qualified products enter the silo through the intermediate bin and enter the reactor through the auger for reaction; after the cooling water in the reactor heat exchange jacket is heat exchanged, it enters the gas-liquid heat exchanger through the gas-liquid heat exchanger pipeline, and the hot air in the gas-liquid heat exchanger enters the drying device. After the reaction is completed, the material is separated by the centrifuge, and the liquid phase enters the filter for filtration, and the solid phase enters the drying device for drying; the filtered liquid phase enters the neutralization tank through the pipeline, and the quicklime and water enter the alkali solution preparation kettle. The generated heat enters the raw material dryer through the heating coil pipeline, and the alkali solution enters the neutralization tank. Among them, part of the acid liquid after filtration by the filter is recovered, and part enters the neutralization tank for acid-base neutralization reaction treatment.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By adopting the heat recovery and utilization system of the utility model, the heat generated in the alkali solution preparation kettle is introduced into the raw material dryer through the setting of the raw material dryer, which greatly improves the drying efficiency of the raw materials and speeds up the production process; through the setting of the gas-liquid heat exchanger, the excess heat generated by the reaction kettle is introduced into the gas-liquid heat exchanger to heat the gas entering the drying device, which improves the heat utilization rate and greatly improves the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the structure of the heat recovery and utilization system of the utility model;

[0019] Figure 2 This is a structural schematic diagram of the material guide plate of the utility model;

[0020] In the figure: 1. negative pressure feeding device; 2. crusher; 3. raw material dryer; 4. vibrating screen; 5. intermediate bin; 6. bin; 7. auger; 8. reactor; 9. centrifuge; 10. filter; 11. drying device; 12. alkali solution preparation kettle; 13. neutralization tank; 14. gas-liquid heat exchanger; 15. heating coil; 16. guide plate; 17. reactor heat exchange jacket; 18. alkali solution preparation kettle heat exchange jacket; 19. gas-liquid heat exchanger inlet pipe; 20. reactor heat exchange jacket inlet pipe; 21. gas-phase gas-liquid heat exchanger inlet pipe; 22. drying device inlet pipe; 23. gas-liquid heat exchanger outlet pipe; 24. alkali solution preparation kettle heat exchange jacket inlet pipe; 25. heating coil inlet pipe; 26. heating coil outlet pipe; 27. guide edge; 28. discharge hole. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 As shown, the heat recovery and utilization system includes a negative pressure feeding device 1 and an alkali solution preparation kettle 12. The negative pressure feeding device 1 is connected to the raw material dryer 3 through a crusher 2. A vibrating screen 4 is provided below the raw material dryer 3. The vibrating screen 4 is connected to the silo 6 through an intermediate bin 5. The silo 6 is connected to the centrifuge 9 through a reactor 8. The centrifuge 9 is connected to the drying device 11 through a filter 10. A heating coil 15 is provided inside the raw material dryer 3. The alkali solution preparation kettle 12 is connected to the heating coil 15 through a heating coil inlet pipe 25. Figure 2As shown, a guide plate 16 is provided inside the raw material dryer 3, and a guide rib 27 and a material discharge hole 28 are provided on the guide plate 16, and a heating coil outlet pipe 26 is connected to the heating coil 15. A reactor heat exchange jacket 17 is provided on the outside of the reactor 8, and an auger 7 is connected to the reactor heat exchange jacket 17. The reactor heat exchange jacket 17 is connected to the gas-liquid heat exchanger 14 through an inlet gas-liquid heat exchanger pipe 19, and the reactor heat exchange jacket 17 is connected to the reactor heat exchange jacket pipe 20. The gas-liquid heat exchanger 14 is connected to a gas-liquid heat exchanger outlet pipe 23, and the gas-liquid heat exchanger 14 is connected to the drying device 11 through an inlet drying device pipe 22, and the gas-liquid heat exchanger 14 is connected to a gas-phase inlet gas-liquid heat exchanger pipe 21. The gas-liquid heat exchanger 14 is used for heat exchange between the gas phase and the liquid phase. An auger 7 is provided between the silo 6 and the reactor 8, and the filter 10 is connected to the neutralization tank 13 through a pipe. The outer side of the alkali solution configuration kettle 12 is provided with an alkali solution configuration kettle heat exchange jacket 18, which is connected to the heating coil inlet pipe 25. The alkali solution configuration kettle heat exchange jacket 18 is connected to the alkali solution configuration kettle heat exchange jacket pipe 24, and the alkali solution configuration kettle heat exchange jacket 18 is connected to the neutralization tank 13 through a pipe.

[0024] The above heat recovery system, when in operation, comprises the following steps:

[0025] (1) The humic acid raw material enters the pulverizer 2 through the negative pressure feeding device 1 for pulverization, and then is dried in the raw material dryer 3 and falls onto the vibrating screen 4 for screening. The qualified products enter the silo 6 through the intermediate bin 5 and enter the reactor 8 through the auger 7 for reaction; (2) After the cooling water in the reactor heat exchange jacket 17 is heat exchanged, it enters the gas-liquid heat exchanger 14 through the gas-liquid heat exchanger pipe 19. The gas phase after heat exchange in the gas-liquid heat exchanger 14 enters the drying device 11. After the reaction is completed, the material is separated by the centrifuge 9, and the liquid phase enters the filter 10 for filtration, and the solid phase enters the drying device 11 for drying; (3) The filtered liquid phase enters the neutralization tank 13 through the pipeline, and the quicklime and water enter the alkali solution preparation kettle 12. The heat generated enters the raw material dryer 3 through the heating coil pipe 25, and the alkali solution enters the neutralization tank 13.

Claims

1. A heat recovery system, characterized in that: The invention comprises a negative pressure feeding device (1) and an alkali solution preparation kettle (12). The negative pressure feeding device (1) is connected to a raw material dryer (3) via a pulverizer (2). A vibrating screen (4) is arranged below the raw material dryer (3). The vibrating screen (4) is connected to a material bin (6) via an intermediate bin (5). The material bin (6) is connected to a centrifuge (9) via a reaction kettle (8). The centrifuge (9) is connected to a drying device (11) via a filter (10). A heating coil (15) is arranged inside the raw material dryer (3). The alkali solution preparation kettle (12) is connected to the heating coil (15) via a heating coil inlet pipe (25).

2. The heat recovery system according to claim 1, characterized in that: The raw material dryer (3) is provided with a material guide plate (16) inside, the material guide plate (16) is provided with a material guide edge (27) and a material discharge hole (28), and the heating coil (15) is connected with a heating coil outlet pipe (26).

3. The heat recovery system according to claim 1, characterized in that: A reactor heat exchange jacket (17) is provided on the outside of the reactor (8), and an auger (7) is connected to the reactor heat exchange jacket (17). The reactor heat exchange jacket (17) is connected to the gas-liquid heat exchanger (14) via an inlet gas-liquid heat exchanger pipeline (19), and the reactor heat exchange jacket (17) is connected to an inlet reactor heat exchange jacket pipeline (20).

4. The heat recovery system according to claim 3, characterized in that: The gas-liquid heat exchanger (14) is connected to a gas-liquid heat exchanger liquid outlet pipe (23), the gas-liquid heat exchanger (14) is connected to the drying device (11) via a drying device inlet pipe (22), and the gas-liquid heat exchanger (14) is connected to a gas-phase gas-liquid heat exchanger inlet pipe (21).

5. The heat recovery system according to claim 1, characterized in that: An auger (7) is provided between the silo (6) and the reaction kettle (8), and the filter (10) is connected to the neutralization tank (13) through a pipeline.

6. The heat recovery system according to claim 5, characterized in that: The outer side of the alkali solution preparation kettle (12) is provided with an alkali solution preparation kettle heat exchange jacket (18), and the alkali solution preparation kettle heat exchange jacket (18) is connected to the heating coil inlet pipe (25).

7. The heat recovery system according to claim 6, characterized in that: The alkali solution configuration kettle heat exchange jacket (18) is connected to an alkali solution configuration kettle heat exchange jacket inlet pipeline (24), and the alkali solution configuration kettle heat exchange jacket (18) is connected to the neutralization tank (13) through the pipeline.

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