Heat exchanger performance detection device

Abstract

The utility model belongs to the technical field of automatic instrument measurement, and particularly relates to a heat exchanger performance detection device. Acid liquor and water vapor are introduced from the acid liquor inlet and the steam inlet at the same time, the heated acid liquor is discharged from the acid liquor outlet, part of the steam is discharged from the steam outlet, flows into the sampling pipeline, is filtered by the filter and dredged by the drain valve and flows into the condenser, and cooling water is continuously introduced into the condenser from the cooling water inlet and flows out from the cooling outlet. The cooled water vapor is changed into water and then flows into the sampling analysis device, the conductivity and the thermal resistor in the sampling analysis device are used for monitoring the cooling water and judging whether the phenomena of acid leakage and the like exist or not, and an operator takes corresponding countermeasures by observing the prompt of a computer display of the PLC control system.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic instrument measurement, and particularly relates to a heat exchanger performance detection device. Background Art

[0002] Stainless steel production lines primarily involve annealing and pickling processes. The pickling process involves nitric acid, sulfuric acid, and hydrofluoric acid. During the pickling process for some steel grades, two or three acids are mixed in appropriate proportions to form a mixed acid to improve the pickling performance of stainless steel strip. During the pickling process, the temperature of the acid used also affects the pickling performance; the higher the temperature, the stronger the pickling performance. Therefore, heat exchangers are used to heat the various acids. The heat source for the heat exchanger is industrial steam. Most industrial heat exchangers do not typically have performance testing devices installed because the heat exchange medium is typically air, water, and other non-toxic, hazardous, flammable, or explosive gases. Repairs are only performed when obvious problems are discovered during routine inspections, without impacting production or safety. The heat exchanger in the stainless steel pickling area is a relatively special equipment. Because the heat exchanger is in direct contact with strong acid at high temperatures, it is very prone to oxidation corrosion. Its performance needs to be monitored regularly. Currently, a conductivity detection probe is used to detect the conductivity at the steam outlet. When the conductivity measurement value is higher than the conductivity of the steam condensate, it is judged that the heat exchanger has acid leakage. At the same time, some other problems may also occur:

[0003] 1. When the heat exchanger is corroded by acid and leaks, it is impossible to quickly locate the leak point and issue an early warning. At the same time, the acid corrodes the leak point of the heat exchanger more under high temperature conditions, making it easy for the acid to leak over a large area.

[0004] 2. The heat exchanger uses steam as the heat source. The steam outlet temperature is about 200°C and exists in the form of gas. The electrical conductivity cannot be used to measure the electrical conductivity of gaseous steam, and the measurement data is inaccurate for a long time.

[0005] 3. Currently, the conductivity probe is installed behind the steam trap. Steam at this location always exists in the form of gas, and the temperature is much higher than the maximum operating temperature of the conductivity probe. The conductivity measurement probe will be damaged in the short term, increasing the cost of spare parts and the labor intensity of operators. Utility Model Content

[0006] In response to the problems of the prior art, the purpose of the present invention is to provide a heat exchanger performance detection method and device for solving the acid leakage problem of the heat exchanger, so that the operator can discover the problem in time and avoid causing more related problems.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A heat exchanger performance detection device, including a heat exchanger, a steam inlet is provided at a lower position on one side of the heat exchanger, an acid liquid inlet is provided above the steam inlet on one side of the heat exchanger, an acid liquid outlet is provided above the heat exchanger, and a steam outlet is provided at an upper position on the other side of the heat exchanger, a sampling pipeline is connected between the pipelines of the heat exchanger and the steam outlet, the end of the sampling pipeline is connected to a tee, one of the tee is connected to a discharge port, and the other is connected to a pneumatic stop valve, the pneumatic stop valve is connected to one end of a condenser, a cooling water inlet is provided on one side of the condenser, and a cooling water outlet is provided on the other side, the other end of the condenser is connected to a sampling analysis device, a thermal resistor and a conductivity are provided on both sides above the sampling analysis device, and an overflow port is provided on one side of the sampling analysis device.

[0009] More preferably, the pneumatic stop valve, thermal resistor and conductivity are all controlled by a PLC control system.

[0010] More preferably, the condensing pipelines in the condenser are arranged in a spiral shape, and the cooling water inlet and the cooling water outlet of the condenser are arranged in a direction opposite to the flow direction of the steam.

[0011] More preferably, the sampling pipeline is provided with a front manual stop valve, a filter, a steam trap, a check valve, and a rear manual stop valve in sequence.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model provides a heat exchanger performance detection device. The steam in the heat exchanger device finally flows into the sampling and analysis device through a sampling pipeline, a steam trap, a condensation pipeline, etc. The conductivity set on the sampling and analysis device will monitor the condensed water. Based on the range of the conductivity of industrial water, a conductivity value less than 1500μs / cm can be used as the normal measurement value, and a conductivity measurement value of 1550μs / cm can be used as the alarm value. That is, when the conductivity of the condensed water in the sampling and analysis device is measured and the measured value is higher than 1550μs / cm, the PLC control system sends an alarm signal, and the alarm signal is displayed on the main control computer, indicating that there is acid leakage in the heat exchanger. The operator can first close the pneumatic stop valve to prevent the acid mixed in the steam from corroding the conductivity and thermal resistor.

[0014] 2. The utility model provides a heat exchanger performance testing device. Steam within the heat exchanger flows through a sampling line, a steam trap, a condensation line, and the like, ultimately into a sampling and analysis device. A thermal resistor installed on the sampling and analysis device monitors the condensed water. When the thermal resistor measures the condensed water in the sampling and analysis device at a value exceeding 60°C, the PLC control system issues an alarm signal, which is displayed on the main control computer, indicating that the condenser's condensation effect is poor. The operator can adjust the injection volume and flow rate in the cooling chamber of the condenser. When the thermal resistor measures a value exceeding 70°C, this temperature approaches the operating limit of the conductivity. The PLC control system issues an alarm signal, indicating that the measurement data may be inaccurate. The main control computer displays a corresponding alarm signal, allowing the operator to promptly close the pneumatic shut-off valve to protect the thermal resistor and conductivity, thereby extending their service life.

[0015] 3. The utility model provides a heat exchanger performance detection device. Steam is introduced into the heat exchanger and flows through the sampling pipeline. Since the thermal resistor and the electrical conductivity cannot monitor the data of water vapor, a condenser is set before the sampling stage device to cool the water vapor and use it for monitoring in the form of water. Secondly, the temperature of water vapor is much higher than the working temperature of the thermal resistor and the electrical conductivity, which will damage the thermal resistor and the electrical conductivity, affecting the service life and causing errors in the monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the heat exchanger detection device of the present utility model.

[0017] The meanings of the reference numerals in the figure are: 1. heat exchanger; 2. acid liquid inlet; 3. acid liquid outlet; 4. steam inlet; 5. steam outlet; 6. sampling pipeline; 7. front manual stop valve; 8. filter; 9. steam trap; 10. check valve; 11. rear manual stop valve; 12. pneumatic stop valve; 13. condenser; 14. cooling water inlet, 15. cooling water outlet; 16. sampling and analysis device; 17. conductivity; 18. thermal resistor; 19. overflow port, 20 tee, 21, discharge port, 22, PLC control system. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0019] like Figure 1The utility model shown is a heat exchanger performance detection device, including a heat exchanger, a steam inlet 4 is provided on one side of the heat exchanger 1, an acid liquid inlet 2 is provided above the steam inlet 4 on one side of the heat exchanger 1, an acid liquid outlet 3 is provided above the heat exchanger 1, and a steam outlet 5 is provided on the other side of the heat exchanger 1. A sampling pipeline 6 is connected between the pipeline of the heat exchanger 1 and the steam outlet 5. Water vapor is introduced into the heat exchanger 1 to heat the acid in the acid liquid pipeline in the heat exchanger 1. The water vapor flows out through the steam outlet 5. The water vapor is discharged from the pipeline and is discharged through the sampling pipe. The sampling line 6 is provided with a front manual stop valve 7, a filter 8, a steam trap 9, a check valve 10, and a rear manual stop valve 11 in sequence. The filter 8 performs a simple filtration on the water vapor to prevent the water vapor flowing into the steam trap 9 and the check valve 10 from clogging the pipeline due to long-term accumulation of impurities. If acid leakage occurs, the front manual stop valve 7 and the rear manual stop valve 11 can be closed to prevent the acid mist from corroding a large area of the pipeline and the filter 8, the check valve 10, and the steam trap 9, thereby providing double protection for the structural components.

[0020] A tee 20 is connected to the end of the sampling pipeline 6 and after the rear manual stop valve 11. One of the tee 20 is connected to the discharge port 21. When acid leakage occurs, after closing the pneumatic stop valve 12, the mixture of excess steam and acid mist in the sampling pipeline 6 can be discharged from the discharge port 21 to further protect the structural components; the other end of the tee 20 is connected to the pneumatic stop valve 12, and the pneumatic stop valve 12 is connected to one end of the condenser 13. A cooling water inlet 14 is provided on one side of the condenser 13, and a cooling water outlet 15 is provided on the other side. The condensation pipeline in the condenser 13 is arranged in a spiral shape. The cooling water inlet 14 and the cooling water outlet 15 of the condenser 13 are arranged in a direction opposite to the flow direction of the steam, so that the contact area of the cooling water is increased, and the water vapor can be quickly cooled for better detection and accurate data.

[0021] The other end of the condenser 13 is connected to a sampling and analysis device 16. A thermal resistor 18 and a conductivity meter 17 are respectively provided on both sides of the upper side of the sampling and analysis device 16. An overflow port 19 is provided on one side of the sampling and analysis device 16. The steam in the heat exchanger 1 device finally flows into the sampling and analysis device 16 through the sampling pipe 6, the steam trap 9, the condenser 13, etc. The conductivity meter 17 and the thermal resistor 18 provided on the sampling and analysis device 16 will monitor the condensed water. Based on the range of the conductivity value of industrial water, a conductivity 17 measurement value less than 1500μs / cm can be regarded as a normal measurement value, and a conductivity 17 measurement value of 1550μs / cm can be regarded as an alarm value. The thermal resistor 18, the conductivity 17 and the PLC control system 22 are connected through signals. When the conductivity 17 measures the condensed water in the sampling and analysis device 16 and the value is higher than 1550μs / cm, the PLC control system 22 (Siemens PLC) s7-400 controller) sends out an alarm signal, and the pneumatic stop valve 12 is connected to the PLC control system 22 (Siemens PLC s7-400 controller) through the signal. The alarm signal is displayed on the main control computer, indicating that there is acid leakage in the heat exchanger 1. The operator can close the pneumatic stop valve 12 first to protect the acid mixed in the steam from corroding the conductivity 17 and the thermal resistor 18; when the condensate measurement value of the thermal resistor 18 on the sampling and analysis device 16 is higher than 60℃, the PLC control system 22 (Siemens PLC s7-400 controller) sends out an alarm signal, and the alarm signal is displayed on the main control computer, indicating that the condensation effect of the condenser 13 is poor. The operator can first adjust the injection amount and flow rate of the cooling water in the condenser 13. If the cooling effect still does not improve after the adjustment, and the measurement value of the thermal resistor 18 is higher than 70℃, this temperature is close to the operating limit temperature of the conductivity 17, and the PLC control system 22 (Siemens PLC s7-400 controller) sends out an alarm signal, indicating that the measurement data at this stage may be inaccurate. The corresponding alarm signal is displayed on the main control computer. The operator can close the pneumatic stop valve 12 in time to protect the thermal resistor 18 and the conductivity meter 17 and extend their service life; if the cooling water level in the sampling and analysis device 16 exceeds the horizontal plane of the overflow port 19, the cooling water will flow out of the overflow port 19 to prevent the parts other than the probes of the thermal resistor 18 and the conductivity meter 17 from being soaked for a long time and damaged.

[0022] During use, acid liquid and water vapor are introduced from the acid liquid inlet 2 and the steam inlet 4 at the same time, the heated acid liquid is discharged from the acid liquid outlet 3, and the steam is discharged from the steam outlet 5. Part of the steam will flow into the sampling pipeline 6, be filtered by the filter 8, and flow into the condenser 13 after being unblocked by the steam trap 9. Cooling water is continuously introduced into the condenser 13 from the cooling water inlet 14 and flows out from the cooling outlet 15. The cooled water vapor becomes water and flows into the sampling and analysis device 16. The conductivity 17 and the thermal resistor 18 in the sampling and analysis device 16 monitor the cooling water to determine whether there is acid leakage or other phenomena. The operator observes the prompts on the computer display of the PLC control system 22 (Siemens PLCs7-400 controller) and takes corresponding countermeasures.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat exchanger performance detection device, comprising a heat exchanger, characterized in that: A steam inlet (4) is provided at a lower position on one side of the heat exchanger (1), an acid liquid inlet (2) is provided above the steam inlet (4) of the heat exchanger (1), an acid liquid outlet (3) is provided above the heat exchanger (1), a steam outlet (5) is provided at an upper position on the other side of the heat exchanger (1), a sampling pipeline (6) is connected between the pipelines of the heat exchanger (1) and the steam outlet (5), the end of the sampling pipeline (6) is connected to a tee (20), one end of the tee (20) is connected to the discharge port ( 21), the other passage is connected to a pneumatic stop valve (12), the pneumatic stop valve (12) is connected to one end of a condenser (13), one side of the condenser (13) is provided with a cooling water inlet (14), and the other side is provided with a cooling water outlet (15), the other end of the condenser (13) is connected to a sampling and analysis device (16), the upper two sides of the sampling and analysis device (16) are respectively provided with a thermal resistor (18) and a conductivity (17), and one side of the sampling and analysis device (16) is provided with an overflow port (19).

2. A heat exchanger performance detection device according to claim 1, characterized in that: The pneumatic stop valve (12), thermal resistor (18), conductivity (17) and PLC control system (22) are connected via signals.

3. The heat exchanger performance detection device according to claim 1, characterized in that: The condensation pipeline in the condenser (13) is arranged in a spiral shape, and the cooling water inlet (14) and the cooling water outlet (15) of the condenser (13) are arranged in a direction opposite to the flow direction of the steam.

4. The heat exchanger performance detection device according to claim 1, characterized in that: The sampling pipeline (6) is provided with a front manual stop valve (7), a filter (8), a steam trap (9), a check valve (10), and a rear manual stop valve (11) in sequence.

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