Filtering device for imazethapyr three-effect evaporation system

Abstract

This utility model belongs to the field of chemical production technology and discloses a filtration device for an imidazole acetonic acid triple-effect evaporation system. It includes a triple-effect evaporator, with the evaporator's outlet connected to the filter's inlet via pipes and valves. The filter's outlet is connected to a transfer pump via pipes and valves. The other end of the transfer pump is connected to a thickener's inlet via a pipe, and the thickener's outlet is connected to a centrifuge's inlet via pipes and valves. This utility model can efficiently separate and remove large sodium chloride crystals precipitated during the evaporation and crystallization process of sodium chloride wastewater, solving problems encountered in existing production technologies. It offers good filtration performance, stable and reliable operation, significantly improves filtration efficiency, and ensures the continuity and stability of the production process.

Description

Technical Field

[0001] This utility model belongs to the field of chemical production technology, specifically relating to a filtration device for an imidazole acetonic acid triple-effect evaporation system. Background Technology

[0002] The triple-effect evaporation system operates on the principle of multi-stage evaporation and waste heat recovery technology. Specifically, the triple-effect evaporation system consists of three evaporators. In each evaporator, the steam generated in the previous evaporator heats the liquid in the next evaporator, forming a three-stage evaporation process. Each evaporation generates steam and waste heat, which is recovered and reused through a heat exchanger, thereby significantly improving energy efficiency and reducing wastewater volume and concentration.

[0003] Currently, in the existing production process of imidazole nicotinic acid, due to the feed flow rate, the material in the evaporation and crystallization device containing sodium chloride forms a certain vortex during operation. Over time, a portion of sodium chloride salt will form in the cavity (1. due to the high concentration of concentrated salt in the system over a long period of time; 2. due to the formation of foam caused by excessive tar in the system, which will hang at a high position and cannot be washed away by the vortex in the system). When the sodium chloride salt reaches a certain level, it will fall into the bottom of the device with the water. Since the treated aqueous solution needs to be pumped out by a transfer pump into a thickener (also called an overflow tank) for salt leaching, if this sodium chloride salt enters the conveying pipe with the material and accumulates before the transfer pump, it will cause the transfer pump to flash yellow (a type of automatic pump protection device, also known as current overload) or stall the transfer pump, causing a shutdown and affecting the continuity of production. Summary of the Invention

[0004] This invention provides a dedicated filtration device for an imidazole acetonic acid triple-effect evaporation system, which overcomes the shortcomings of existing technologies. It can efficiently separate and remove large sodium chloride crystals precipitated during the evaporation and crystallization process of sodium chloride wastewater, effectively solving problems encountered in existing production processes (such as pipe blockage, equipment wear, and reduced product quality). The device has good filtration performance, stable and reliable operation, and significantly improves the filtration effect, fundamentally ensuring the continuity and stability of the production process.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A filtration device for an imidazole acetonic acid triple-effect evaporation system includes a triple-effect evaporator. The outlet of the triple-effect evaporator is connected to the inlet of a filter via a pipe and a valve. The outlet of the filter is connected to a transfer pump via a pipe and a valve. The other end of the transfer pump is connected to the inlet of a thickener via a pipe. The outlet of the thickener is connected to the inlet of a centrifuge via a pipe and a valve.

[0007] Preferably, the triple-effect evaporator is a rising film evaporator, made of TA2 material, with an evaporation capacity of 0.5–600 t / h and dimensions of [missing information].

[0008] Preferably, the transfer pump is a magnetic pump, model LCZ32-160; made of TA2 material, with a power of 3kw.

[0009] Preferably, the filter is located below the outlet of the triple-effect evaporator. This layout design makes full use of gravity, allowing the salt-containing liquid from the triple-effect evaporator to flow naturally into the filter, ensuring that large salt particles remain in the filter, and that the liquid is efficiently and smoothly filtered before entering the magnetic pump and being pumped into the thickener.

[0010] Preferably, the filter is designed as a cubic or cylindrical structure. It has an inlet at the top and an outlet at the bottom, forming a material flow path. Inside the filter are two inclined layers of filter screens (both with a 20-mesh pore size). The top of the filter screen is fixedly connected to one apex corner of the filter, and the bottom of the filter screen is fixedly connected to the other bottom corner of the filter. This design effectively intercepts salt crystals. A flange-connected sodium chloride collection port is provided on the filter sidewall at the bottom of the upper filter screen. This sodium chloride collection port design facilitates regular cleaning of accumulated salt crystals, thereby significantly reducing the frequency of manual opening and maintenance.

[0011] Furthermore, the filter screen is welded to the inner wall of the filter. (The screen should be cleaned of blockages every 7 days).

[0012] Furthermore, the sodium chloride collection port is connected to a sodium chloride storage tank via a pipeline. Sodium chloride cleaning is performed periodically. Before cleaning, strict safety procedures must be followed: the power source of the transfer pump must be shut off, and the relevant valves connecting the filter inlet and outlet pipelines must be closed to ensure effective system isolation and prevent media leakage. Subsequently, the retained sodium chloride salt is removed and collected through the sodium chloride collection port. The collected sodium chloride salt and the ammonium chloride salt produced by the system are both collected and stored for subsequent processing.

[0013] Preferably, the thickener is made of Q235 / TA2 material; its volume is 2m³. 3 3kw of power.

[0014] Preferably, the centrifuge is model LLW450 with a power of 22kw.

[0015] Preferably, the centrifuge is equipped with a solid material outlet and a liquid material outlet. The solid material outlet is connected to a sodium chloride storage tank via a pipeline, and a ton bag collection system is used to collect the separated sodium chloride centrally. The liquid material outlet is connected to a mother liquor storage tank via a pipeline, which is used to temporarily store the separated mother liquor for subsequent reuse in a triple-effect evaporator.

[0016] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] This invention reduces the sodium chloride content in the waste liquid discharged from the triple-effect evaporator by adding a filter to remove sodium chloride particles generated inside the evaporator. This effectively prevents damage and yellow flashing phenomena from the subsequent transfer pump during material transfer.

[0018] In summary, this invention can efficiently separate and remove large sodium chloride crystals precipitated during the evaporation and crystallization process of sodium chloride wastewater, effectively solving problems encountered in existing production technologies (such as pipe blockage, equipment wear, and reduced product quality). The device has good filtration performance, stable and reliable operation, and significantly improves the filtration effect, fundamentally ensuring the continuity and stability of the production process. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0020] In the diagram, 1 is a triple-effect evaporator; 2 is a filter; 21 is a double-layer filter screen; 22 is a sodium chloride collection port; 3 is a transfer pump; 4 is a thickener; and 5 is a centrifuge. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Example 1:

[0023] like Figure 1 As shown, a filtration device for an imidazole acetonic acid triple-effect evaporation system includes a triple-effect evaporator 1. The outlet (not shown) of the triple-effect evaporator 1 is connected to the inlet (not shown) of a filter 2 via a pipe (not shown) and a valve (not shown). The outlet of the filter 2 is connected to a transfer pump 3 via a pipe and a valve. The other end of the transfer pump 3 is connected to the inlet of a thickener 4 via a pipe. The outlet of the thickener 4 is connected to the inlet of a centrifuge 5 via a pipe and a valve.

[0024] The filter 2 has an inlet at the top and an outlet at the bottom. Its internal core structure consists of a double-layered filter screen 21 installed at an angle. In particular, a sodium chloride collection port 22 with a flange connection is provided on the side wall of the filter 2 at the bottom of the upper filter screen. This design facilitates the periodic cleaning and collection of salt crystals.

[0025] In actual production: After a certain degree of evaporation, the sodium chloride in the material in the triple-effect evaporator 1 will crystallize to form sodium chloride salt, which will be adsorbed onto the inner wall of the triple-effect evaporator 1. When the material is discharged from the outlet of the triple-effect evaporator 1, these crystal particles will be carried into the filter 2 set below the triple-effect evaporator 1 along with the material. After filtration by the filter 2, the crystallized sodium chloride particles in the material are separated. The remaining material is then transported to the thickener 4 for salt leaching treatment by the transfer pump 3. Because the material does not contain crystallized sodium chloride particles, the yellowing or damage of the transfer pump 3 caused by the accumulation of sodium chloride particles is greatly reduced. After the material is salted by the thickener 4, it is then transported to the centrifuge 5 for centrifugation. The sodium chloride salt and water obtained from the salt leaching treatment of the thickener 4 are separated. The sodium chloride salt enters the sodium chloride storage tank (not marked) for temporary storage in preparation for incineration (to avoid secondary pollution), and the water enters the water storage tank for reuse in the triple-effect evaporator 1.

[0026] The double-layer filter screen 21 in filter 2 and the sodium chloride collection port 22 can be designed in a linked manner, and the cleaning cycle can be determined according to the production situation to reduce operation and maintenance costs and ensure production continuity.

[0027] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A filtration device for an imidazole acetonic acid triple-effect evaporation system, characterized in that: The device includes a triple-effect evaporator, the outlet of which is connected to the inlet of a filter via a pipe and a valve. The outlet of the filter is connected to a transfer pump via a pipe and a valve. The other end of the transfer pump is connected to the inlet of a thickener via a pipe. The outlet of the thickener is connected to the inlet of a centrifuge via a pipe and a valve.

2. The filtration device for the imidazole acetonic acid triple-effect evaporation system as described in claim 1, characterized in that: The triple-effect evaporator is a rising film evaporator.

3. The filtration device for the imidazole acetonic acid triple-effect evaporation system as described in claim 1, characterized in that: The transfer pump is a magnetic pump.

4. The filtration device for the imidazole acetonic acid triple-effect evaporation system as described in claim 1, characterized in that: The filter is located below the outlet of the triple-effect evaporator.

5. The filtration device for the imidazole acetonic acid triple-effect evaporation system as described in claim 1, characterized in that: The filter is a cubic or cylindrical structure with an inlet at the top and an outlet at the bottom. The filter contains a double-layered filter screen arranged at an angle. A sodium chloride collection port with a flange connection is provided on the filter side wall on the bottom side of the upper filter screen.

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