Novel circulating water blowdown system

Abstract

The utility model discloses a novel circulating water sewerage system which comprises a circulating water return pipeline, a cooling tower, a strong brine regulating reservoir and a recycled water regulating reservoir, the water outlet end of the circulating water return pipeline is divided into three paths which are respectively communicated with the water inlets of the cooling tower, the strong brine regulating reservoir and the reuse water regulating reservoir through pipelines; a conductivity sensor is arranged at the water outlet end of the circulating water return pipeline; and a shut-off valve is arranged on a pipeline for communicating the circulating water return pipeline with the cooling tower. The method has the advantages that the problems of large pollution discharge amount, large strong brine treatment load and high treatment cost caused by pollution discharge due to low concentration multiple can be avoided. When the strong brine adjusting tank cannot continue to receive the sewage water, the sewage water can enter the reuse water adjusting tank, so that the problem of operation bottleneck of a strong brine treatment system caused by single direction of the sewage water can be avoided, and the problem of aggravated corrosion tendency of the system caused by the fact that the sewage water cannot be discharged in time can be solved.

Description

Technical field:

[0001] The utility model relates to a sewage discharge system, in particular to a novel circulating water sewage discharge system. Background technology:

[0002] In chemical enterprises, cooling water from the circulating water system is needed as the cold medium to enter the company's various heat exchangers to exchange and cool the process heat medium. As the heat exchange proceeds, the temperature of the cooling water will increase, and the heated cooling water will become hot water. It needs to be sent back to the top of the cooling tower as circulating return water. The cooling tower will lower the temperature of the cooling water, and then the circulating water pump will increase the pressure and send it to various heat exchangers. This process is repeated to achieve the recycling of cooling water.

[0003] During the cooling water circulation process, the cooling water volume will decrease due to continuous evaporation, causing the ion concentration in the cooling water to increase. At the same time, since the circulating return water is fully in contact with the air in the cooling tower, the dissolved oxygen in the water is replenished, resulting in the circulating water always being saturated with dissolved oxygen; the dissolved oxygen in the water is the main cause of electrochemical corrosion of metals, and the carbon dioxide in the water is resolved and dissipated in the cooling tower, increasing the chances of calcium carbonate in the water scaling and precipitation on the heat transfer surface, resulting in an increase in scaling and corrosion tendency in the system. For this reason, the circulating water system usually needs to open the drain valve regularly to discharge part of the circulating return water into the concentrated water regulating tank, and add a certain amount of fresh water to the system to maintain the water balance of the system; at the same time, in order to stabilize the water quality of the system, it is also necessary to regularly and quantitatively add water quality stabilizers, such as corrosion inhibitors, scale inhibitors, bactericides, etc. to prevent corrosion, scaling and microbial growth problems in the system.

[0004] However, there are the following problems with regular sewage discharge: in winter, the ambient temperature is low and the temperature of the circulating return water is relatively low. Therefore, the evaporation of the circulating water system is small and the concentration ratio is low. Regular sewage discharge will cause the circulating water that does not meet the sewage discharge standard to be discharged to the concentrated water regulating tank, resulting in a large amount of circulating water sewage discharge. Since the cost of treating wastewater in the concentrated brine device is high, the concentrated brine treatment load is increased after the wastewater enters the concentrated brine treatment, resulting in poor economic benefits. At the same time, due to the single destination of sewage, once the concentrated water regulating tank cannot accept sewage due to system reasons, the sewage discharge of circulating water is restricted, affecting the continuous and stable operation of the circulating water system, the system ion concentration increases, and the corrosion to the pipelines and equipment is aggravated; moreover, in winter, if the circulating water sewage is not discharged for a long time, the sewage pipeline and valve are prone to freezing. In addition, the water quality of the circulating cooling water will fluctuate. Through regular sewage discharge, sometimes the circulating water concentration ratio is too high and the sewage is not discharged in time. Scaling and corrosion promote each other, forming a complex synergistic effect, affecting or even destroying the normal operation of the cooling water user equipment. Utility model content:

[0005] In order to solve the above problems, the purpose of the utility model is to provide a new circulating water sewage system.

[0006] The utility model is implemented by the following technical solutions:

[0007] A new circulating water sewage system, including a circulating water return pipeline, a cooling tower, a concentrated brine regulating tank and a recycled water regulating tank;

[0008] The water outlet of the circulating water return pipeline is divided into three paths, which are respectively connected to the water inlet of the cooling tower, the concentrated brine regulating tank and the recycled water regulating tank through pipelines;

[0009] A conductivity sensor is provided at the water outlet end of the circulating water return pipeline, and a shut-off valve is provided on the pipeline connecting the circulating water return pipeline and the cooling tower;

[0010] The signal output end of the conductivity sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the shut-off valve.

[0011] Furthermore, a regulating tank liquid level sensor is provided in the concentrated brine regulating tank and the recycled water regulating tank; a regulating valve is provided on the pipeline connecting the circulating water return pipeline with the concentrated brine regulating tank and the recycled water regulating tank;

[0012] The signal output end of the regulating tank liquid level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the regulating valve.

[0013] Furthermore, the outlet of the reuse water regulating tank is connected to the inlet of the concentrated brine regulating tank through a pipeline, and an outlet valve is provided at the outlet of the reuse water regulating tank; the signal output end of the controller is signal-connected to the signal input end of the outlet valve.

[0014] Furthermore, it also includes a water supply tank, the water outlet of which is connected to the water supply inlet of the cooling tower through a pipeline, a water supply valve is provided at the water outlet of the water supply tank, and a cooling water level sensor is provided in the cooling tower; the signal output end of the cooling water level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the water supply valve.

[0015] Advantages of the utility model:

[0016] The utility model starts to discharge sewage only when the conductivity of the circulating water backwater reaches a certain level, which can avoid the problems of large sewage discharge volume, large concentrated brine treatment load and high treatment cost caused by low concentration ratio. When the concentrated brine regulating tank can no longer accept sewage, the sewage can enter the recycled water regulating tank, which can avoid the problem of bottleneck of concentrated brine treatment system operation caused by the single destination of sewage, resulting in the inability to discharge sewage in time and aggravating the corrosion tendency of the system. When the liquid level of the cooling tower is low due to evaporation and sewage discharge, the water replenishment valve will be automatically opened, and the water replenishment tank will replenish water to the cooling tower. The replenished water can not only meet the balance of water in the system, but also reduce the concentration ratio of circulating water, and also reduce the temperature of circulating water, thereby reducing the energy consumption of the cooling tower. Description of the drawings:

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of system connection of this embodiment;

[0019] Figure 2 Schematic diagram of signal control principle of this embodiment.

[0020] In the figure: circulating water return pipeline 1, cooling tower 2, brine regulating tank 3, recycled water regulating tank 4, conductivity sensor 5, regulating tank level sensor 6, controller 7, shut-off valve 8, regulating valve 9, outlet valve 10, water supply tank 11, cooling water level sensor 12, water supply valve 13. Specific implementation method:

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1:

[0023] like Figure 1 , 2 A novel circulating water sewage system shown includes a circulating water return pipeline 1, a cooling tower 2, a concentrated brine regulating tank 3 and a recycled water regulating tank 4;

[0024] The outlet end of the circulating water return pipeline 1 is divided into three paths, which are respectively connected to the water inlets of the cooling tower 2, the concentrated brine regulating tank 3 and the recycled water regulating tank 4 through pipelines;

[0025] A conductivity sensor 5 is provided at the water outlet end of the circulating water return pipeline 1, and a shut-off valve 8 is provided on the pipeline connecting the circulating water return pipeline 1 and the cooling tower 2; regulating tank level sensors 6 are provided in the concentrated brine regulating tank 3 and the reuse water regulating tank 4; regulating valves 9 are provided on the pipelines connecting the circulating water return pipeline 1 with the concentrated brine regulating tank 3 and the reuse water regulating tank 4; the water outlet of the reuse water regulating tank 4 is connected with the water inlet of the concentrated brine regulating tank 3 through a pipeline, and an outlet valve 10 is provided at the water outlet of the reuse water regulating tank 4; the present embodiment also includes a water supply tank 11, the water outlet of the water supply tank 11 is connected with the water supply inlet of the cooling tower 2 through a pipeline, a water supply valve 13 is provided at the water outlet of the water supply tank 11, and a cooling water level sensor 12 is provided in the cooling tower 2.

[0026] The signal output ends of the conductivity sensor 5, the regulating tank level sensor 6 and the cooling water level sensor 12 are all connected to the signal input ends of the controller 7, and the signal output ends of the controller 7 are respectively connected to the signal input ends of the shut-off valve 8, the regulating valve 9, the water outlet valve 10 and the water supply valve 13.

[0027] Job Description:

[0028] In this embodiment, a conductivity sensor 5 is arranged at the outlet end of the circulating water return pipeline 1 to monitor the concentration multiple of the circulating water return. When the conductivity of the monitored circulating water return is lower than the set value, it indicates that the concentration multiple of the circulating water return is low and can continue to enter the cooling tower 2 for circulation. At this time, the shut-off valve 8 is in an open state and the regulating valve 9 is in a closed state. When the conductivity of the monitored circulating water return reaches the set maximum conductivity value, it indicates that the concentration multiple of the circulating water return is high and sewage treatment is required. At this time, the shut-off valve 8 is closed, and the regulating valve 9 arranged on the pipeline connecting the circulating water return pipeline 1 and the concentrated brine regulating tank 3 is opened, so that the circulating water return is discharged to the concentrated brine regulating tank 3, until the conductivity of the monitored circulating water return is lower than the set minimum conductivity value, the sewage discharge is completed, the regulating valve 9 is closed, and the shut-off valve 8 is opened, and the circulating water return re-enters the cooling tower 2 to participate in the cooling cycle. Therefore, this embodiment can avoid the problems of large sewage discharge volume, large concentrated brine treatment load and high treatment cost caused by low concentration multiples.

[0029] In the process of sewage discharge, if the concentrated brine regulating tank 3 cannot continue to receive sewage due to system reasons (failure or large processing load) or after the liquid level reaches a high liquid level, the regulating valve 9 on the pipeline connected to the concentrated brine regulating tank 3 is closed, and the regulating valve 9 on the pipeline connected to the reuse water regulating tank 4 is opened to allow the sewage to enter the reuse water regulating tank 4. This can avoid the problem of bottleneck in the operation of the concentrated brine treatment system caused by the single destination of sewage, resulting in the problem of the inability to discharge sewage in time and the aggravation of the system corrosion tendency. Since the system of this embodiment does not discharge sewage all the time, when it does not discharge sewage, the processing load of the concentrated brine treatment system is reduced. At this time, the outlet valve 10 can be opened to discharge the sewage in the reuse water regulating tank 4 to the concentrated brine regulating tank 3 for temporary storage and then sent to the subsequent concentrated brine treatment system for treatment.

[0030] In addition, during the operation of the system, the liquid level in the cooling tower 2 will be monitored. When the liquid level is low due to evaporation and sewage discharge, the water replenishment valve 13 will be automatically opened, and the water replenishment tank 11 will replenish water to the cooling tower 2. The replenished water volume can not only meet the water volume balance in the system, but also reduce the concentration multiple of the circulating water, and also reduce the temperature of the circulating water, thereby reducing the energy consumption of the cooling tower 2.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of circulating water sewage system, characterized in that: Including circulating water return pipeline, cooling tower, concentrated brine regulating tank and recycled water regulating tank; The water outlet of the circulating water return pipeline is divided into three paths, which are respectively connected to the water inlet of the cooling tower, the concentrated brine regulating tank and the recycled water regulating tank through pipelines; A conductivity sensor is provided at the water outlet end of the circulating water return pipeline, and a shut-off valve is provided on the pipeline connecting the circulating water return pipeline and the cooling tower; The signal output end of the conductivity sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the shut-off valve.

2. A novel circulating water sewage system according to claim 1, characterized in that: A regulating tank liquid level sensor is provided in the concentrated brine regulating tank and the recycled water regulating tank; a regulating valve is provided on the pipeline connecting the circulating water return pipeline with the concentrated brine regulating tank and the recycled water regulating tank; The signal output end of the regulating tank liquid level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the regulating valve.

3. A novel circulating water drainage system according to claim 1, characterized in that: The water outlet of the reuse water regulating tank is connected to the water inlet of the concentrated brine regulating tank through a pipeline, and a water outlet valve is provided at the water outlet of the reuse water regulating tank; the signal output end of the controller is signal-connected to the signal input end of the water outlet valve.

4. A novel circulating water sewage system according to claim 1, characterized in that: It also includes a water supply tank, the water outlet of which is connected to the water supply inlet of the cooling tower through a pipeline, a water supply valve is provided at the water outlet of the water supply tank, and a cooling water level sensor is provided in the cooling tower; the signal output end of the cooling water level sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the water supply valve.

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