Crystallizer heat exchanger circulating water recovery device

Abstract

The utility model relates to the technical field of heat exchanger circulating water recovery, in particular to a crystallizer heat exchanger circulating water recovery device which comprises a heat exchanger and a main drain pipe, a shell pass inlet of the heat exchanger is communicated with a circulating water inlet pipeline, a shell pass outlet of the heat exchanger is communicated with a circulating water return pipeline, and the top of a shell pass of the heat exchanger is fixedly communicated with a nitrogen pipeline. The bottom of the shell pass of the heat exchanger is fixedly communicated with at least one water drainage pipeline along the circumference, each water drainage pipeline is communicated with a main liquid drainage pipe, and a liquid drainage main valve is connected to the main liquid drainage pipe in series. When circulating cooling water in the shell pass of the heat exchanger is switched into steam, the circulating cooling water does not need to be discharged into a trench, but is conveyed back to the circulating water recycling pipeline and finally returns to the circulating water pipe network. Therefore, the waste of circulating cooling water is reduced, and the consumption of raw water is reduced; and meanwhile, the hidden danger of environmental pollution caused by discharging circulating cooling water to a trench is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger circulating water recovery, in particular to a crystallizer heat exchanger circulating water recovery device. Background Art

[0002] In the high-pressure triamine production process, when hot-washing the crystallizer, the circulating water on the shell side of the heat exchanger of the crystallizer needs to be discharged into the ditch. After the circulating water is discharged, steam is introduced into the shell side of the heat exchanger to heat the hot washing water of the crystallizer. The specific disadvantages of this process are as follows:

[0003] 1) Discharging circulating water into the ditch will cause waste of circulating water and increase raw water consumption;

[0004] 2) The circulating water is discharged into the ditch, which has a bad smell and pollutes the environment. In addition, the circulating water discharge end is easily frozen and blocked in winter when the temperature is low;

[0005] 3) The water discharged into the ditch is concentrated in the accident pool, which increases the load of the accident pool, and the wastewater in the accident pool is sent out, which increases the power consumption;

[0006] 4) A funnel is provided on the drainage pipeline corresponding to the water outlet at the bottom of the shell of the heat exchanger. When the circulating cooling water is discharged, the circulating cooling water enters the drainage pipeline through the funnel. The drainage end here is an open end. Summary of the invention

[0007] The utility model provides a circulating water recovery device for a crystallizer heat exchanger, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the circulating water on the shell side of the existing heat exchanger is discharged externally, causing waste of circulating water and increasing raw water consumption.

[0008] The technical solution of the utility model is achieved through the following measures: a circulating water recovery device for a crystallizer heat exchanger, comprising a heat exchanger and a main drain pipe, the shell side inlet of the heat exchanger is connected with a circulating water inlet pipeline, the shell side outlet of the heat exchanger is connected with a circulating water return pipeline, the shell side top of the heat exchanger is fixedly connected with a nitrogen pipeline, the shell side bottom of the heat exchanger is fixedly connected with at least one drainage pipeline along the circumference, each drainage pipeline is connected with the main drain pipe, a drainage main valve is connected in series on the main drain pipe, and the main drain pipe between the drainage pipeline and the drainage main valve is fixedly connected with the circulating water return pipeline by a circulating water recovery pipeline.

[0009] The following are further optimizations and / or improvements to the above utility model technical solution:

[0010] An exhaust valve may be fixedly installed on the top of the shell side of the heat exchanger; a drain valve is connected in series to each drainage pipeline; and a check valve and a valve are connected in series to the nitrogen pipeline in sequence along the nitrogen delivery direction.

[0011] An antifreeze drainage pipeline may be fixed on the above-mentioned circulating water recovery pipeline close to the circulating water return pipeline, and a valve is connected in series on the antifreeze drainage pipeline.

[0012] A connecting pipeline can be fixedly connected between the circulating water return pipeline and the circulating water inlet pipeline between the shell side outlet of the above-mentioned heat exchanger and the antifreeze drainage pipeline, and a valve is fixedly installed on the connecting pipeline; a discharge pipe is fixedly connected between the circulating water return pipeline and the main drainage pipe.

[0013] A sight glass may be fixedly installed at the circulating water recovery pipeline close to the circulating water return pipeline.

[0014] Along the flow direction of the fluid, a flow transmitter and an electric control valve may be fixedly installed on the circulating water inlet pipeline; along the flow direction of the fluid, a pressure safety valve, an electric control valve and a temperature regulating valve may be fixedly installed on the circulating water return pipeline.

[0015] When the utility model switches the circulating cooling water in the shell of the heat exchanger to steam, the circulating cooling water does not need to be discharged into the ditch, but is returned to the circulating water recovery pipeline and finally returned to the circulating water network. This reduces the waste of circulating cooling water and the consumption of raw water; at the same time, it avoids the hidden danger of environmental pollution caused by the discharge of circulating cooling water into the ditch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the process flow of the utility model.

[0017] The codes in the attached drawings are: 1 is a heat exchanger, 2 is a main drain pipe, 3 is a circulating water inlet pipeline, 4 is a circulating water return pipeline, 5 is a nitrogen pipeline, 6 is a drainage pipeline, 7 is a main drain valve, 8 is a circulating water recovery pipeline, 9 is an exhaust valve, 10 is a drain valve, 11 is a check valve, 12 is a connecting pipeline, 13 is an antifreeze drainage pipeline, 14 is a flow transmitter, 15 is an electric control valve, 16 is a pressure safety valve, 17 is a temperature regulating valve, 18 is a valve, and 19 is a discharge pipe. DETAILED DESCRIPTION

[0018] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0019] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0020] The present invention is further described below in conjunction with the embodiments and drawings:

[0021] Embodiment 1: As attached Figure 1 As shown, the circulating water recovery device of the crystallizer heat exchanger comprises a heat exchanger 1 and a main drain pipe 2, the shell side inlet of the heat exchanger 1 is connected with a circulating water inlet pipeline 3, the shell side outlet of the heat exchanger 1 is connected with a circulating water return pipeline 4, the shell side top of the heat exchanger 1 is fixedly connected with a nitrogen pipeline 5, the shell side bottom of the heat exchanger 1 is fixedly connected with at least one drainage pipeline 6 along the circumference, each drainage pipeline 6 is connected with the main drain pipe 2, a drainage main valve 7 is connected in series on the main drain pipe 2, and the main drain pipe 2 between the drainage pipeline 6 and the drainage main valve 7 and the circulating water return pipeline 4 are fixedly connected with a circulating water recovery pipeline 8.

[0022] When the circulating cooling water in the shell side of the heat exchanger 1 is switched to steam, the circulating cooling water does not need to be discharged into the ditch, but is returned to the circulating water recovery pipeline 8 and finally returned to the circulating water network. This reduces the waste of circulating cooling water and the consumption of raw water; at the same time, it avoids the environmental pollution risks caused by the discharge of circulating cooling water into the ditch.

[0023] The above-mentioned crystallizer heat exchanger circulating water recovery device can be further optimized and / or improved according to actual needs:

[0024] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, an exhaust valve 9 is fixedly installed on the top of the shell side of the heat exchanger 1.

[0025] During operation of the heat exchanger 1 , gas can be discharged through the exhaust valve 9 .

[0026] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, each drainage pipeline 6 is connected in series with a drain valve 10 .

[0027] Compared with the prior art of installing a funnel on the drainage pipeline 6, the present device cancels the funnel design, and the drainage pipeline 6 is set as a closed pipeline, which is conducive to the nitrogen pressure delivery of circulating cooling water.

[0028] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, along the nitrogen delivery direction, the nitrogen pipeline 5 is serially connected with a check valve 11 and a valve 18 in sequence.

[0029] The setting of the check valve 11 can prevent the media from flowing into each other.

[0030] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, an antifreeze drainage pipeline 13 is fixed on the circulating water recovery pipeline 8 close to the circulating water return pipeline 4, and a valve 18 is connected in series to the antifreeze drainage pipeline 13.

[0031] In winter, under low-temperature operating conditions, the circulating water in the circulating water recovery pipeline 8 can be discharged through the antifreeze drainage pipeline 13 as needed.

[0032] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a connecting pipeline 12 is fixedly connected between the circulating water return pipeline 4 and the circulating water inlet pipeline 3 between the shell outlet of the heat exchanger 1 and the antifreeze drainage pipeline 13, and a valve 18 is fixedly installed on the connecting pipeline 12; a discharge pipe 19 is fixedly connected between the circulating water return pipeline 4 and the main drainage pipe 2.

[0033] As required, the circulating cooling water in the circulating water inlet pipeline 3 can directly enter the circulating water return pipeline 4 through the connecting pipeline 12 and return to the circulating water network.

[0034] Embodiment 7: As an optimization of the above embodiment, a sight glass is fixedly installed at the circulating water recovery pipeline 8 close to the circulating water return pipeline 4 as needed.

[0035] Observe the drainage through the sight glass.

[0036] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, along the fluid flow direction, a flow transmitter 14 and an electric control valve 15 are fixedly installed on the circulating water inlet pipeline 3.

[0037] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, along the fluid flow direction, a pressure safety valve 16, an electric control valve 15 and a temperature regulating valve 17 are fixedly installed on the circulating water return pipeline 4.

[0038] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0039] The use process of the best embodiment of the utility model is as follows: when hot water is needed to clean the crystallizer, the circulating water inlet pipeline 3 is stopped from conveying circulating cooling water to the shell side of the heat exchanger 1, the drain valve 10 on the drain pipeline 6 is opened, and the drain main valve 7 is closed. The cooling circulating water of the shell side of the heat exchanger 1 is pressurized by nitrogen, so that the cooling circulating water of the shell side of the heat exchanger 1 flows through the drain pipeline 6, the main drain pipe 2, and the circulating water recovery pipeline 8 in sequence, and returns to the circulating water return pipeline 4. After the circulating water of the shell side of the heat exchanger 1 is discharged, the nitrogen pipeline 5 is closed; then steam is introduced through the circulating water inlet pipeline 3, and the hot washing water of the crystallizer flows through the tube side of the heat exchanger 1, and the steam heats the hot washing water of the crystallizer.

Claims

1. A circulating water recovery device for a crystallizer heat exchanger, characterized in that It includes a heat exchanger and a main drain pipe. The shell inlet of the heat exchanger is connected to a circulating water inlet pipeline, the shell outlet of the heat exchanger is connected to a circulating water return pipeline, the top of the shell side of the heat exchanger is fixedly connected to a nitrogen pipeline, the bottom of the shell side of the heat exchanger is fixedly connected to at least one drainage pipeline along the circumference, each drainage pipeline is connected to the main drain pipe, a drainage main valve is connected in series to the main drain pipe, and the main drain pipe between the drainage pipeline and the drainage main valve is fixedly connected to the circulating water return pipeline with a circulating water recovery pipeline.

2. The crystallizer heat exchanger circulating water recovery device according to claim 1, characterized in that An exhaust valve is fixedly installed on the top of the shell side of the heat exchanger; a drain valve is connected in series on each drainage pipeline; and check valves and valves are connected in series on the nitrogen pipeline in sequence along the nitrogen delivery direction.

3. The crystallizer heat exchanger circulating water recovery device according to claim 1 or 2, characterized in that An antifreeze drainage pipeline is fixed on the circulating water recovery pipeline close to the circulating water return pipeline, and a valve is connected in series on the antifreeze drainage pipeline.

4. The crystallizer heat exchanger circulating water recovery device according to claim 3, characterized in that A connecting pipeline is fixedly connected between the circulating water return pipeline between the shell side outlet of the heat exchanger and the antifreeze drainage pipeline and the circulating water inlet pipeline, and a valve is fixedly installed on the connecting pipeline; a discharge pipe is fixedly connected between the circulating water return pipeline and the main drainage pipe.

5. The crystallizer heat exchanger circulating water recovery device according to claim 1, 2 or 4, characterized in that A sight glass is fixedly installed on the circulating water recovery pipeline close to the circulating water return pipeline.

6. The crystallizer heat exchanger circulating water recovery device according to claim 3, characterized in that A sight glass is fixedly installed on the circulating water recovery pipeline close to the circulating water return pipeline.

7. The crystallizer heat exchanger circulating water recovery device according to claim 1, 2, 4 or 6, characterized in that Along the fluid flow direction, a flow transmitter and an electric control valve are fixedly installed on the circulating water inlet pipeline.

8. The crystallizer heat exchanger circulating water recovery device according to claim 3, characterized in that Along the fluid flow direction, a flow transmitter and an electric control valve are fixedly installed on the circulating water inlet pipeline.

9. The crystallizer heat exchanger circulating water recovery device according to claim 5, characterized in that Along the fluid flow direction, a flow transmitter and an electric control valve are fixedly installed on the circulating water inlet pipeline.

10. The crystallizer heat exchanger circulating water recovery device according to claim 1 or 2 or 4 or 6 or 8 or 9, characterized in that Along the fluid flow direction, a pressure safety valve, an electric control valve and a temperature regulating valve are fixedly installed on the circulating water return pipeline.

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