Agricultural monoammonium phosphate concentration energy-saving device

Abstract

The utility model relates to the technical field of monoammonium phosphate, and particularly provides an agricultural monoammonium phosphate concentration energy-saving device which comprises a concentration flash chamber, the lower part of the concentration flash chamber is connected to a concentration heat exchanger through a pipeline and a concentration circulating pump, and a discharge hole of the concentration heat exchanger is connected back to the concentration flash chamber; a gas phase outlet in the top of the concentration flash chamber is connected to an air filter through a pipeline; a purified gas outlet of the air filter is connected to a heat exchange medium inlet of the concentration heat exchanger after passing through a compressor; and the pipeline between the concentration circulating pump and the concentration heat exchanger is also provided with a concentration discharge port. Secondary steam in the concentration process is effectively filtered and purified and then enters the MVR system, core equipment of the MVR system is prevented from being damaged, meanwhile, the fixed investment is small, the purified steam is used as a heat source in the concentration process, the operation energy consumption is low, and the operation is simple.

Description

Technical Field

[0001] This utility model belongs to the field of monoammonium phosphate production technology, and relates to an energy-saving device for concentrating monoammonium phosphate for agricultural use. Background Technology

[0002] In industrial production, evaporation and concentration are widely used in food, pharmaceutical, and chemical industries. Currently, the production of agricultural monoammonium phosphate mostly adopts a triple-effect evaporation process, which divides the evaporation process into three units connected in series. Each unit has its own heater and evaporator. Compared with traditional single-effect evaporation, it is more energy-efficient and efficient. However, it still has problems such as complex equipment, large fixed investment, higher energy consumption than MVR systems, and lower efficiency. Moreover, the secondary steam of agricultural monoammonium phosphate is an acidic gas with many impurities, and cannot be directly used in MVR systems, otherwise it will damage the air compressor in the MVR system. Summary of the Invention

[0003] This utility model provides an energy-saving device for agricultural monoammonium phosphate concentration. It effectively filters and purifies the secondary steam during the concentration process before it enters the MVR system, thus avoiding damage to its core equipment. At the same time, it has low fixed investment, and the purified steam is used as a heat source for the concentration process. It has low operating energy consumption and is easy to operate.

[0004] The technical solution of this utility model is to provide an energy-saving device for concentrating monoammonium phosphate for agricultural use, including a concentration flash chamber, the lower part of which is connected to a concentration heat exchanger through a pipeline and a concentration circulation pump, and the outlet of the concentration heat exchanger is then connected back to the concentration flash chamber; the gas phase outlet at the top of the concentration flash chamber is connected to an air filter through a pipeline, and the purified gas outlet of the air filter is connected to the heat exchange medium inlet of the concentration heat exchanger through a compressor; a concentration outlet is also provided on the pipeline between the concentration circulation pump and the concentration heat exchanger.

[0005] Furthermore, the air filter is a silicon carbide ceramic membrane filter, and the filter element is made of porous silicon carbide material with a pore size of 20nm.

[0006] Furthermore, the air filter is also connected to a regenerated gas inlet valve, a regenerated washing liquid inlet valve, and a regenerated washing liquid outlet valve.

[0007] Furthermore, the device also includes a regenerated washing liquid tank, which is connected to the regenerated washing liquid inlet valve via a regenerated pump and pipeline, and the regenerated washing liquid outlet valve is connected to the regenerated washing liquid tank via a pipeline.

[0008] Furthermore, the air filter is also equipped with a drain valve at the bottom.

[0009] Furthermore, the regenerated gas inlet valve is connected to the air pipeline.

[0010] Furthermore, the air filters are operated in parallel in two or more units, with one unit in use and one on standby, or multiple units in use and one on standby.

[0011] The device provided by this utility model consists of a concentration flash chamber, a concentration heat exchanger, a concentration circulation pump, an air filter, a regeneration washing liquid tank, a regeneration pump, a compressor, and supporting pipes and valves. Agricultural monoammonium phosphate slurry is concentrated in the concentration flash chamber. A small portion enters the next process, while the majority of the slurry is heated by the concentration heat exchanger before entering the concentration flash chamber again. Under the heating action of the concentration heat exchanger, part of the liquid in the slurry reaches its boiling point and becomes mixed steam, which exits through the top pipe of the concentration flash chamber and enters the air filter for filtration into clean steam. The clean steam then enters the concentration heat exchanger through the air compressor to provide a heat source for the heat exchanger. When the air filter's filtration efficiency decreases due to impurities, air is introduced into the air filter through the filter regeneration gas inlet valve for purging. The impurities filtered by the air filter are dislodged under the purging action of the air. The liquid in the regeneration washing liquid tank is then used by the regeneration pump to wash the impurities from the air filter before entering the regeneration washing liquid tank again to circulate and rinse the air filter, thus achieving regeneration.

[0012] This utility model has the following beneficial effects:

[0013] (1) This device has a simple structure, small size, low manufacturing cost, and simple operation.

[0014] (2) After the agricultural monoammonium phosphate slurry enters the concentration flash chamber, the evaporated mixed steam is filtered by the air filter into clean steam to provide energy for the heat exchanger. There is no corrosion, abrasion and scaling of the internal parts of the equipment. The device has a long operating cycle. At the same time, there is no energy loss during the steam purification process, and the whole system can save energy consumption significantly.

[0015] (3) The filter uses porous silicon carbide as the filter material, which has a large flow rate, small pore size, and a filter pore size of 20nm. It has high hardness, high temperature resistance and corrosion resistance, and high filtration accuracy.

[0016] (4) The air filters of this device can be connected in parallel in two or more units, with one unit in use and one unit in standby or multiple units in use and one unit in standby, to ensure that the whole device can operate stably and continuously. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The diagram shows: 1. Concentration flash chamber; 2. Concentration circulation pump; 3. Concentration heat exchanger; 4. Air filter; 4-1. Flash chamber inlet valve; 4-2. Purified gas outlet valve; 4-3. Regenerated gas inlet valve; 4-4. Regenerated washing liquid inlet valve; 4-5. Regenerated washing liquid outlet valve; 4-6. Drain valve; 5. Compressor; 6. Regenerated washing liquid tank; 7. Regeneration pump. Detailed Implementation

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0020] like Figure 1 As shown, this utility model provides an energy-saving device for concentrating monoammonium phosphate for agricultural use, including a concentration flash chamber 1, the lower part of which is connected to a concentration heat exchanger 3 via a pipeline and a concentration circulation pump 2. The outlet of the concentration heat exchanger is then connected back to the concentration flash chamber. The gas phase outlet at the top of the concentration flash chamber enters the air filter 4 via a pipeline and a gas phase inlet valve 4-1 of the flash chamber. The purified gas outlet valve 4-2 of the air filter is connected to the heat exchange medium inlet of the concentration heat exchanger via a compressor 5. A concentration outlet is also provided on the pipeline between the concentration circulation pump 2 and the concentration heat exchanger 3.

[0021] In some embodiments, the air filter is a silicon carbide ceramic membrane filter, with the filter element made of porous silicon carbide material and a pore size of 20 nm. Silicon carbide ceramic membrane filters have advantages such as high throughput, corrosion resistance, easy cleaning, and long service life, and can effectively remove impurities from the gas phase coming from the concentrated flash chamber.

[0022] In some embodiments, the air filter is further connected to a regeneration gas inlet valve, a regeneration washing liquid inlet valve, and a regeneration washing liquid outlet valve. When excessive impurities accumulate in the air filter and the filtration efficiency decreases, air is introduced through the regeneration gas inlet valve for purging, and washing liquid is introduced through the regeneration washing liquid inlet valve and discharged through the regeneration washing liquid outlet valve. Through purging and repeated rinsing, the filter element of the air filter can be regenerated and reused.

[0023] In a more preferred embodiment, the device further includes a regenerated washing liquid tank, which is connected to a regenerated washing liquid inlet valve via a regenerated pump and pipeline, and a regenerated washing liquid outlet valve is connected to the regenerated washing liquid tank via a pipeline. The washed liquid is placed in the regenerated washing liquid tank, and the clarified liquid after sedimentation can be recycled.

[0024] The air filter is also equipped with a drain valve at the bottom. This is used to drain materials during maintenance.

[0025] In some embodiments, the regenerated gas inlet valve is connected to an air pipeline. Air is used as the regenerated gas.

[0026] In a more preferred embodiment, the air filter is operated in parallel with two or more units, in a one-in-one-standby or multiple-in-one-standby configuration. This allows for continuous production even when the air filter requires regeneration.

[0027] In specific operation, agricultural monoammonium phosphate slurry enters the concentration flash chamber from the concentration inlet. A small portion of the concentrated slurry is pumped through the concentration circulation pump and enters the next process through the concentration outlet. Most of the slurry passes through the concentration heat exchanger and then enters the concentration flash chamber. Under the heating action of the concentration heat exchanger, part of the liquid in the slurry reaches the boiling point and becomes mixed steam, which exits from the top pipe of the concentration flash chamber. After being filtered by the air filter, it becomes clean steam. The clean steam enters the concentration heat exchanger through the air compressor to provide energy for the heat exchanger.

[0028] When the filtration efficiency of the silicon carbide filter element of the air filter decreases due to the accumulation of impurities, it is purged with air and then washed and regenerated with a washing liquid.

[0029] The above embodiments describe preferred embodiments of the present invention, but the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combining the various technical features in any other way. These simple modifications and combinations should also be considered as the content disclosed by the present invention and all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be determined by the appended claims.

Claims

1. An energy-saving device for concentrating monoammonium phosphate for agricultural use, characterized in that: It includes a concentration flash chamber, the lower part of which is connected to a concentration heat exchanger via a pipeline and a concentration circulation pump. The outlet of the concentration heat exchanger is then connected back to the concentration flash chamber. The gas phase outlet at the top of the concentration flash chamber is connected to an air filter via a pipeline. The purified gas outlet of the air filter is connected to the heat exchange medium inlet of the concentration heat exchanger via a compressor. A concentration outlet is also provided on the pipeline between the concentration circulation pump and the concentration heat exchanger.

2. The apparatus according to claim 1, characterized in that: The air filter is a silicon carbide ceramic membrane filter, and the filter element is made of porous silicon carbide material with a pore size of 20nm.

3. The apparatus according to claim 1, characterized in that: The air filter is also connected to a regenerated gas inlet valve, a regenerated detergent inlet valve, and a regenerated detergent outlet valve.

4. The apparatus according to claim 3, characterized in that: The device also includes a regenerated washing liquid tank, which is connected to the regenerated washing liquid inlet valve via a regenerated pump and pipeline, and the regenerated washing liquid outlet valve is connected to the regenerated washing liquid tank via a pipeline.

5. The apparatus according to claim 3, characterized in that: The air filter is also equipped with a drain valve at the bottom.

6. The apparatus according to claim 3, characterized in that: The regenerated gas inlet valve is connected to the air pipeline.

7. The apparatus according to any one of claims 1 to 6, characterized in that: The air filters are operated in two or more parallel units, with one unit in use and one on standby, or multiple units in use and one on standby.

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