Liquid level and conductivity linkage control system of evaporative condenser

Abstract

The utility model belongs to the technical field of intelligent control of evaporative condensers, and particularly relates to a liquid level and conductivity linkage control system of an evaporative condenser. The system comprises at least one evaporative condenser, wherein the evaporative condenser comprises a main body and a water pan positioned in the main body; the detection unit comprises a liquid level meter and a conductivity meter which are respectively used for detecting the liquid level and the conductivity of circulating water in the water tray; the liquid level adjusting unit is used for adjusting the liquid level of circulating water in the water tray; the pollution discharge unit is used for discharging impurities in the water tray; and the control unit is electrically connected with the detection unit, the liquid level adjusting unit and the pollution discharge unit and used for receiving the detection result of the detection unit and controlling the states of the liquid level adjusting unit and the pollution discharge unit in a linkage mode based on the detection result. The evaporative condenser solves the problems that in the prior art, a water pond of an evaporative condenser scales, water resources are wasted due to the fact that the amount of discharged water is too large, and operation of the evaporative condenser is unstable due to the fact that the lower discharged water level is too low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of the intelligent control of evaporative condenser, more particularly, relates to a liquid level and conductivity linkage control system of evaporative condenser. BACKGROUND

[0002] In the refrigeration system, the evaporative condenser is connected with the refrigeration machine, and the evaporative condenser absorbs the heat of high-temperature gaseous refrigerant in the water pan by using the spray water outside the water pan to evaporate, so that the refrigerant in the pipe is gradually cooled from gaseous state to liquid state. Influenced by the water quality and evaporation amount, the concentrated multiple of the spray water after evaporation is different, and the conductivity rate is different. If the conductivity rate is out of control, it will cause serious scaling in the water pan, affect the heat exchange effect, and further affect the normal operation of the refrigeration machine. At the same time, after the spray water evaporates, the liquid level in the water pan gradually decreases. If the water is not replenished in time, the liquid level is too low, the water pump works abnormally, the amount of spray water is insufficient, and the operation of the refrigeration machine and the water pump is seriously affected.

[0003] Chinese patent document CN211087016U discloses an automatic water quality adjusting system for evaporative condenser, which comprises an evaporative condenser for condensing liquid, an electric conductivity electrode for detecting the electric conductivity of the liquid in the evaporative condenser, a control cabinet for processing the electric conductivity detection data sent by the electric conductivity electrode, and an electric actuator for executing the control command sent by the control cabinet to open or close the drain pipe. When the electric conductivity detection data of the electric conductivity electrode is lower than the preset value in the control cabinet, the control cabinet controls the electric actuator to raise the opening degree of the drain pipe, so that the electric conductivity detection data returns to the preset value. The system is used to realize intelligent adjustment and control of the water quality of the evaporative condenser in a single machine dual-pole ammonia gas compressor, and prevent the evaporative condenser fin of the single machine dual-pole ammonia gas compressor from scaling and wasting energy.

[0004] Chinese patent document CN207786563U discloses a reflux water automatic control device in TMPTMA synthesis process, which comprises a reaction kettle, a condenser, a water separator and a water separation control device. The reaction kettle is connected with the condenser, and the condenser is connected with the water separator. The water separation control device comprises a first electric conductivity tester, a second electric conductivity tester, a liquid level controller and a water outlet valve. The probes of the first electric conductivity tester and the second electric conductivity tester are installed in the water separator and are electrically connected with the liquid level controller respectively. The water outlet valve is arranged at the water outlet of the water separator and is electrically connected with the liquid level controller. The system adopts the electric conductivity tester, the liquid level controller and the water outlet valve for interlocking control, which is used to realize efficient automatic water separation control in the dehydration reaction process of the crosslinking agent TMPTMA, so as to improve the automation level in the production process of the crosslinking agent.

[0005] Therefore, it is urgent to design a liquid level and conductivity linkage control system for the evaporative condenser to prevent the evaporative condenser water tray from scaling, the excessive pollution water discharge, the water resource waste and the unstable operation of the evaporative condenser caused by the low lower pollution water discharge level. Utility model content

[0006] The utility model aims at overcoming at least one defect of the prior art, provides a liquid level and conductivity linkage control system of evaporative condenser, to solve the evaporative condenser water tray scale, the water resource waste caused by excessive pollution water discharge and the unstable operation of evaporative condenser caused by the low lower pollution water discharge level.

[0007] The detailed technical scheme of the utility model is as follows:

[0008] A liquid level and conductivity linkage control system of evaporative condenser, the system includes:

[0009] At least one evaporative condenser, the evaporative condenser includes a main body and a water tray in the main body;

[0010] Detection unit, including liquid level meter and conductivity meter, the probe of liquid level meter and conductivity meter are all arranged in the water tray of evaporative condenser and are respectively used for detecting the liquid level and conductivity of circulating water in the water tray;

[0011] Liquid level regulating unit, which is communicated with the water tray of the evaporative condenser, is used for adjusting the liquid level of circulating water in the water tray;

[0012] Pollution unit, which is communicated with the water tray of the evaporative condenser, is used for discharging impurities in the water tray;

[0013] Control unit, which is electrically connected with the detection unit, liquid level regulating unit and pollution unit respectively, is used for receiving the detection result of the detection unit and linkage controlling the state of the liquid level regulating unit and pollution unit based on the detection result.

[0014] According to the utility model preferred, the liquid level regulating unit includes a water replenishing opening formed on the water tray, a water replenishing pipeline connected with the water replenishing opening and a water replenishing pneumatic valve arranged on the water replenishing pipeline, the water replenishing pipeline is communicated with the inside of the water tray through the water replenishing opening;The water replenishing pneumatic valve is electrically connected with the control unit, and the control unit is used for controlling the opening degree of the water replenishing pneumatic valve.

[0015] According to the utility model preferred, the liquid level regulating unit further includes an overflow opening formed on the water tray and an overflow pipeline connected with the overflow opening, the overflow pipeline is communicated with the inside of the water tray through the overflow opening, and the opening height of the overflow opening is higher than the opening height of the water replenishing opening.

[0016] According to the utility model preferred, the blowdown unit includes the blowdown opening of being arranged in the bottom of the water tray, the blowdown pipeline being connected with the blowdown opening and the blowdown pneumatic total valve being arranged on the blowdown pipeline, the blowdown pipeline is connected with the inside of water tray through the blowdown opening, the blowdown opening is arranged height is lower than the blowdown opening of the water replenishing opening is arranged height;The blowdown pneumatic total valve is electrically connected with the control unit, and the control unit is used for controlling the opening and closing degree of the blowdown pneumatic total valve.

[0017] According to the utility model preferred, the system includes multiple evaporative condensers, and adjacent two evaporative condensers are connected through the communication pipeline.

[0018] According to the utility model preferred, the communication pipeline is provided with the communication control valve, and is used for controlling the on-off between adjacent two evaporative condensers.

[0019] According to the utility model preferred, the system includes multiple evaporative condensers, and the blowdown control branch valve is arranged on the blowdown pipeline connected with the water tray of each evaporative condenser, and the blowdown control branch valve is used for controlling the on-off of the corresponding blowdown pipeline.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] The utility model provides a kind of liquid level and conductivity linkage control system of evaporative condenser, by being arranged in the water tray inside evaporative condenser liquid level meter and the probe of conductivity meter, for respectively detecting the liquid level and conductivity of circulating water in water tray, and the data collected are transmitted to control unit to compare with preset limit value, then according to comparison result to control the working state of liquid level adjusting unit and blowdown unit, to realize the linkage control of liquid level and conductivity of evaporative condenser, effectively prevent the water tray of evaporative condenser from scaling, improve condensing effect simultaneously, reduce the energy consumption of refrigerating machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure diagram of the utility model described liquid level and conductivity linkage control system of evaporative condenser.

[0023] In the drawing: 1-evaporative condenser;21-water replenishing opening, 22-water replenishing pipeline, 23-water replenishing pneumatic valve, 24-overflow opening, 25-overflow pipeline;31-blowdown opening, 32-blowdown pipeline, 33-blowdown pneumatic total valve, 34-blowdown control branch valve;4-liquid level meter;5-conductivity meter;6-control unit;71-communication opening, 72-communication pipeline, 73-communication control valve. DETAILED DESCRIPTION

[0024] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0027] The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0028] Embodiment 1,

[0029] The present embodiment provides a liquid level and conductivity linkage control system of an evaporative condenser, as shown in the accompanying drawings, the system comprises at least one evaporative condenser 1, and a detection unit, a liquid level adjusting unit and a blowdown unit corresponding to the evaporative condenser 1. Figure 1

[0030] The evaporative condenser 1 comprises a main body and a water pan in the main body, which has the effect of condensing gaseous refrigerant into liquid; the detection unit comprises a liquid level meter 4 and a conductivity meter 5, the liquid level meter 4 is used to measure the liquid level of circulating water in the water pan of the evaporative condenser 1, has the functions of on-site viewing and data remote transmission, and is convenient for workers to check and confirm on-site data and remote data during inspection; the conductivity meter 5 is used to measure the conductivity of circulating water in the water pan of the evaporative condenser 1 to determine whether the water quality meets the use requirements; the probe part of the conductivity meter 5 is arranged in the water pan of the evaporative condenser 1 and immersed in the circulating water in the water pan, and the probe part of the conductivity meter 5 is connected to its remote part.

[0031] The liquid level adjusting unit is in communication with the water pan of the evaporative condenser 1 and is used to adjust the liquid level of circulating water in the water pan; the blowdown unit is in communication with the water pan of the evaporative condenser 1 and is used to discharge impurities in the water pan.

[0032] ​The system further comprises a control unit 6 electrically connected with the liquid level meter 4, the remote part of the conductivity meter 5, the liquid level adjusting unit and the blowdown unit, for receiving the detection results of the detection units and controlling the states of the liquid level adjusting unit and the blowdown unit based on the detection results. In this embodiment, the control unit 6 can adopt a DCS system, for processing the detection data sent by the remote liquid level meter 4 and the conductivity meter 5 and outputting corresponding control instructions according to the detection data, so as to realize the linkage control of the liquid level and the conductivity of the evaporative condenser 1.

[0033] Therefore, when the conductivity of the circulating water in the water pan of the evaporative condenser 1 is higher or lower than the preset limit value, the control unit 6 controls the liquid level adjusting unit and the blowdown unit to perform corresponding work, so as to restore the conductivity value of the circulating water in the water pan to the use interval.

[0034] Specifically, the liquid level adjusting unit in this embodiment comprises a water replenishing port 21, a water replenishing pipeline 22 and a water replenishing pneumatic valve 23, wherein the water replenishing port 21 is arranged on the side wall of the water pan, one end of the water replenishing pipeline 22 is connected with the water replenishing port 21 and communicates with the inside of the water pan through the water replenishing port 21, and when the liquid level of the circulating water in the water pan is lower than a certain limit value, water can be replenished into the water pan through the water replenishing pipeline 22 and the water replenishing port 21 in sequence.

[0035] The water replenishing pneumatic valve 23 is arranged on the water replenishing pipeline 22 and is used for controlling the opening and closing of the water replenishing pipeline 22. The water replenishing pneumatic valve 23 is electrically connected with the control unit 6, and the control unit 6 is used for controlling the opening and closing degree of the water replenishing pneumatic valve 23, so as to control the opening and closing of the water replenishing pipeline 22 and the size of the internal flow capacity, so as to realize the adjustment of the liquid level of the circulating water in the water pan.

[0036] Further, the liquid level adjusting unit in this embodiment further comprises an overflow port 24 and an overflow pipeline 25, wherein the overflow port 24 is also arranged on the side wall of the water pan, one end of the overflow pipeline 25 is connected with the overflow port 24 and communicates with the inside of the water pan through the overflow port 24, and the arrangement height of the overflow port 24 is higher than that of the water replenishing port 21. When the liquid level of the circulating water in the water pan is higher than a certain limit value, the circulating water in the water pan will flow out through the overflow port 24 and the overflow pipeline 25 in sequence, so as to reduce the liquid level of the circulating water in the water pan.

[0037] Therefore, in combination with the water replenishing port 21 and the overflow port 24 arranged on the side wall of the water pan and the water replenishing pipeline 22 and the overflow pipeline 25 arranged thereon, the liquid level of the circulating water in the water pan can be adjusted.

[0038] The blowdown unit in the embodiment comprises a blowdown port 31, a blowdown pipeline 32 and a blowdown pneumatic master valve 33. The blowdown port 31 is arranged on the side wall of the bottom of the water tray. One end of the blowdown pipeline 32 is connected with the blowdown port 31 and communicates with the inside of the water tray through the blowdown port 31. The blowdown port 31 is arranged at a height lower than the water supply port 21.

[0039] The blowdown pneumatic master valve 33 is arranged on the blowdown pipeline 32 and is used to control the opening and closing of the blowdown pipeline 32. The blowdown pneumatic master valve 33 is electrically connected with the control unit 6. The control unit 6 is used to control the opening and closing degree of the blowdown pneumatic master valve 33, so as to control the opening and closing of the blowdown pipeline 32, thereby realizing the blowdown of the impurities in the circulating water in the water tray.

[0040] Further, continuing to refer to Figure 1 When the system in the embodiment comprises a plurality of evaporative condensers 1, a set of liquid level meter 4 and electric conductivity meter 5 are arranged for each evaporative condenser 1, which are used to detect the liquid level and electric conductivity of the circulating water in the water tray of the evaporative condenser 1. The water tray of each evaporative condenser 1 is respectively provided with a water supply port 21, an overflow port 24 and a blowdown port 31.

[0041] Meanwhile, a communication port 71 is arranged on the side wall of the water tray of each evaporative condenser 1. A communication pipeline 72 is connected with the communication port 71. The water trays of two adjacent evaporative condensers 1 can be communicated through the communication pipeline 72. A communication control valve 73 is arranged on the communication pipeline 72. The communication control valve 73 is used to control the opening and closing of the communication pipeline 72, thereby controlling the opening and closing of the water trays of two adjacent evaporative condensers 1. In actual work, the communication control valve 73 is generally in an open state.

[0042] Further, when the system in the embodiment comprises a plurality of evaporative condensers 1, a blowdown control branch valve 34 is arranged on the blowdown pipeline 32 connected with the water tray of each evaporative condenser 1. The blowdown control branch valve 34 is used to control the opening and closing of the corresponding blowdown pipeline 32. In actual work, the blowdown control branch valve 34 is generally in an open state.

[0043] In this way, when the system comprises a plurality of evaporative condensers 1, the above-mentioned communication structure can reduce the investment and control amount of other accessory devices. A plurality of communicated evaporative condensers 1 can share one set of control system.

[0044] The following will further describe the liquid level and electric conductivity linkage control system of the evaporative condenser in the embodiment by taking an example.

[0045] As described above, the liquid level and electric conductivity of the circulating water in the water tray of the evaporative condenser 1 are both provided with corresponding limits, which are set by the background personnel according to the use requirements.

[0046] In this example, the liquid level indication is provided with low-low limit, low limit, medium limit, high limit and high-high limit in the DCS system, which can be referred to Figure 1 The middle dashed line part; the conductivity indication is provided with low limit, high limit and high-high limit in the DCS system. The opening degree of the water supply pneumatic valve 23 and the liquid level indication of the liquid level gauge 4 can be automatically controlled by PID; the blowdown pneumatic master valve 33 and the conductivity indication of the conductivity meter 5 and the liquid level indication of the liquid level gauge 4 can be interlocked.

[0047] Among them, the liquid level low-low limit interlock: when the liquid level gauge 4 indication is lower than the low-low limit set value in the DCS system, the water supply pneumatic valve 23 is fully open, and the blowdown pneumatic master valve 33 is fully closed; according to the water pump pumping capacity and evaporation capacity of the evaporative condenser 1, the low-low limit set value should be higher than the equipment safety liquid level value.

[0048] Among them, the liquid level high-high limit alarm: when the liquid level gauge 4 indication is higher than the high-high limit set value in the DCS system, the DCS system liquid level high-high limit alarm prompts the operator to determine the actual liquid level in the water pan on site and check whether the overflow port 24 and the communication port 71 of each evaporative condenser 1 are blocked by impurities. After the operator confirms the on-site situation, the blowdown pneumatic master valve 33 can be opened to control the liquid level below the high limit.

[0049] It should be noted here that the liquid level height corresponding to the high-high limit set value should be higher than the opening height of the overflow port 24 and lower than the height of the outer edge of the water pan. Under the premise that the overflow port 24 is not blocked by impurities, the liquid level high-high limit alarm generally will not be triggered.

[0050] Among them, the conductivity automatic control I: when the indication of the conductivity meter 5 is lower than the conductivity low limit set value, the liquid level gauge 4 liquid level low limit, the set value of the PID automatic control module of the liquid level-water supply pneumatic valve 23 is automatically assigned. That is, the liquid level PID automatic control value is the liquid level low limit value.

[0051] Among them, the conductivity automatic control II: when the indication of the conductivity meter 5 is higher than the conductivity low limit and lower than the conductivity high limit set value, the liquid level gauge 4 liquid level medium limit, the set value of the PID automatic control module of the liquid level-water supply pneumatic valve 23 is automatically assigned. That is, the liquid level PID automatic control value is the liquid level medium limit value.

[0052] Among them, the conductivity automatic control III: when the indication of the conductivity meter 5 is higher than the conductivity high limit set value, the liquid level gauge 4 liquid level high limit, the set value of the PID automatic control module of the liquid level-water supply pneumatic valve 23 is automatically assigned. That is, the liquid level PID automatic control value is the liquid level high limit value.

[0053] When the conductivity of the water is higher than the high limit of the conductivity of the DCS system, and the liquid level is higher than the high limit of the liquid level, the water supply pneumatic valve 23 is fully opened, and the blowdown pneumatic valve 33 is fully opened; when the liquid level is lower than the low limit of the liquid level, the blowdown pneumatic valve 33 is fully closed, and the water supply pneumatic valve 23 is restored to PID automatic control, and the set value of the PID automatic control is selected according to the value of the conductivity meter 5, according to the automatic control scheme.

[0054] In actual operation, the low limit and the high limit of the conductivity meter 5 can be set by the operator according to the weather and the water quality, and the high limit is managed by the shift leader or the shift foreman. The low limit, the medium limit and the high limit of the liquid level meter 4 can be set by the operator according to the conductivity and the overflow flow, and the low limit and the high limit are managed by the shift leader or the shift foreman.

[0055] Therefore, the liquid level and the conductivity linkage control system of the evaporative condenser achieves the intelligent linkage control of the conductivity and the liquid level of the evaporative condenser, achieves the stable control of the conductivity, prevents the scaling of the water tray of the condenser, improves the condensing effect, and reduces the energy consumption of the refrigeration machine.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the technical scheme of the utility model, and are not the limitation of the specific embodiments of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model claim should be included in the protection scope of the utility model claim.

Claims

1. A liquid level and conductivity linkage control system for an evaporative condenser, characterized in that, The system comprises: at least one evaporative condenser, which comprises a main body and a water tray in the main body; a detection unit, which comprises a liquid level meter and an electric conductivity meter, and the probes of the liquid level meter and the electric conductivity meter are arranged in the water tray of the evaporative condenser and are respectively used for detecting the liquid level and the electric conductivity of circulating water in the water tray; a liquid level adjusting unit, which is connected to the water tray of the evaporative condenser and is used for adjusting the liquid level of circulating water in the water tray; a blowdown unit, which is connected to the water tray of the evaporative condenser and is used for discharging impurities in the water tray; a control unit, which is electrically connected to the detection unit, the liquid level adjusting unit and the blowdown unit, is used for receiving the detection results of the detection unit, and is used for controlling the states of the liquid level adjusting unit and the blowdown unit based on the detection results.

2. The liquid level and conductivity linked control system of an evaporative condenser according to claim 1, wherein, The liquid level adjusting unit comprises a water replenishment opening formed on the water tray, a water replenishment pipeline connected to the water replenishment opening, and a water replenishment pneumatic valve arranged on the water replenishment pipeline, the water replenishment pipeline is connected to the inside of the water tray through the water replenishment opening, the water replenishment pneumatic valve is electrically connected to the control unit, and the control unit is used for controlling the opening degree of the water replenishment pneumatic valve.

3. The liquid level and conductivity linked control system of an evaporative condenser according to claim 2, wherein, The liquid level adjusting unit further comprises an overflow opening formed on the water tray and an overflow pipeline connected to the overflow opening, the overflow pipeline is connected to the inside of the water tray through the overflow opening, and the opening height of the overflow opening is higher than that of the water replenishment opening.

4. The liquid level and conductivity linked control system of an evaporative condenser according to claim 2, wherein, The blowdown unit comprises a blowdown opening formed on the bottom of the water tray, a blowdown pipeline connected to the blowdown opening, and a blowdown pneumatic master valve arranged on the blowdown pipeline, the blowdown pipeline is connected to the inside of the water tray through the blowdown opening, the opening height of the blowdown opening is lower than that of the water replenishment opening, the blowdown pneumatic master valve is electrically connected to the control unit, and the control unit is used for controlling the opening degree of the blowdown pneumatic master valve.

5. The liquid level and conductivity linked control system of an evaporative condenser according to claim 1, wherein, The system comprises a plurality of evaporative condensers, and adjacent two evaporative condensers are connected through a communication pipeline.

6. The liquid level and conductivity linked control system of an evaporative condenser according to claim 5, wherein, A communication control valve is arranged on the communication pipeline and is used for controlling the on-off of adjacent two evaporative condensers.

7. The liquid level and conductivity linked control system of a evaporative condenser according to claim 4, wherein, The system comprises a plurality of evaporative condensers, and a blowdown control branch valve is arranged on the blowdown pipeline connected to the water tray of each evaporative condenser, and the blowdown control branch valve is used for controlling the on-off of the corresponding blowdown pipeline.

Images