Mechanical condenser temperature automatic control device

Abstract

The utility model discloses a mechanical condenser temperature automatic control device which comprises a condenser shell and a cold cavity heat preservation layer, the cold cavity heat preservation layer is arranged in the condenser shell, two mutually communicated cold cavity bodies are arranged in the cold cavity heat preservation layer, one cold cavity body is communicated with a sample gas input pipe and a peristaltic pump, and the other cold cavity body is communicated with a sample gas output pipe. The mechanical condenser temperature automatic control device comprises two cold cavity bodies, one cold cavity body is communicated with a peristaltic pump, the other cold cavity body is communicated with a sample gas output pipe and the other peristaltic pump, the two cold cavity bodies are both wrapped in the middle of an aluminum pipe heating wire assembly, and an evaporator and heat exchanger assembly is arranged outside the aluminum pipe heating wire assembly. When the use environment temperature, the sample gas inlet amount and the sample gas humidity of the condenser are changed, the condenser can automatically and quickly recover to a set state without manual adjustment, and when the sample introduction condition is changed, the refrigeration temperature of the condenser is 4 DEG C + / -0.5 DEG C. The device has the advantages of being good in stability, high in precision and good in controllability.

Description

Technical Field

[0001] This utility model relates to the field of automatic temperature control, specifically a mechanical condenser temperature automatic control device. Background Technology

[0002] Continuous Emission Monitoring Systems (CEMS) are devices that continuously monitor the concentration and total emissions of gaseous pollutants and particulate matter from air pollution sources and transmit the information to the relevant authorities in real time. As a crucial tool for environmental regulation, the accuracy and reliability of its data directly impact the effective monitoring of pollutant emissions and the success of environmental protection. CEMS can be categorized into three types based on sampling methods: complete extraction systems, dilution extraction systems, and direct measurement systems. Complete extraction systems are further divided into cold-dry extraction and hot-wet extraction systems based on their pretreatment methods. Cold-dry extraction CEMS: Flue gas is collected through a dust filter equipped with a heating device and fed into a heated gas pipeline. After condensation and dehydration, the sample passes through a fine filter and enters the analyzer to analyze the composition and concentration of the flue gas. The basic structure includes: a sampling probe, a sampling heating pipeline, a filter, a condenser, a sampling pump, a gas analyzer, and auxiliary units.

[0003] Because the sample gas contains components such as SO2 that are easily soluble in water, rapid cooling and dehydration are required to ensure the accuracy of the measurement data and reduce dissolution losses during the dehydration process. Therefore, in practical applications, the condenser temperature is usually set to 3-4℃. Furthermore, changes in the temperature and humidity of the sample gas entering the condenser, as well as variations in the ambient temperature of the condenser, all affect the dehydration effect of the condenser, thus affecting the dew point of the sample gas entering the analytical instrument for measurement, and consequently impacting the measurement results. Therefore, the condenser's processing capacity, adaptability, and stable operation are crucial for the accuracy and reliability of the data.

[0004] For the reasons mentioned above, mechanical condensers are widely used in automatic flue gas monitoring systems employing the refrigeration drying method due to their advantages such as high flow rate and low dew point, high heat exchange efficiency, continuous condensation and water removal, and low maintenance and operating costs. The working principle of a mechanical condenser is as follows: the compressor draws in low-pressure refrigerant vapor from the evaporator, compresses it to increase its pressure, and then sends it to the cooler. In the cooler, the refrigerant releases heat and condenses into a liquid. Next, the liquid is depressurized through an expansion valve and enters the evaporator, where it absorbs heat and evaporates into low-pressure vapor, which is then drawn back into the compressor, completing the entire refrigeration cycle. In addition, a power regulator exists in the flow path to adjust the flow rate of the liquid from the cooler through the expansion valve to the evaporator, thereby regulating the condenser's refrigeration power. Currently available mechanical condensers can operate reliably under stable external conditions. However, when external conditions change, such as the temperature and humidity of the sample gas or changes in ambient temperature, existing mechanical condensers cannot adapt quickly and require manual adjustment of the power regulator to adapt to changes in external conditions. This operation is cumbersome and has poor adaptability to the sampling environment. Utility Model Content

[0005] The purpose of this invention is to provide an automatic temperature control device for a mechanical condenser, in order to solve the problems mentioned in the background art, such as the poor adaptability of existing mechanical condensers to the sampling environment and the cumbersome operation.

[0006] The technical solution of this utility model is implemented as follows: A mechanical condenser temperature automatic control device includes a condenser shell and a cold cavity insulation layer. The cold cavity insulation layer is disposed inside the condenser shell, and two interconnected cold cavity bodies are disposed inside. One cold cavity body is connected to a sample gas input pipe and a peristaltic pump, and the other cold cavity body is connected to a sample gas output pipe and another peristaltic pump. Both cold cavity bodies are wrapped in the middle of an aluminum tube heating wire assembly. An evaporator and heat exchanger assembly are disposed outside the aluminum tube heating wire assembly. The aluminum tube heating wire assembly is electrically connected to a temperature switch. The evaporator and heat exchanger assembly is connected to a compressor through a liquid absorber. The compressor is connected to an expansion valve through a cooler. The other end of the expansion valve is connected to the evaporator and heat exchanger assembly. A temperature measuring resistor is integrated inside the aluminum tube heating wire assembly.

[0007] Preferably, the aluminum tube heating wire assembly includes an aluminum tube and a heating wire. The aluminum tube heating wire assembly is inserted into a mechanical cold trap and fits tightly against its inner wall. A cold cavity body is inserted inside the aluminum tube heating wire assembly, and a spiral groove is provided on the outside of the aluminum tube heating wire assembly.

[0008] Preferably, the aluminum tube heating wire assembly has a 3mm diameter hole for inserting the temperature measuring resistor to measure the temperature.

[0009] Preferably, the aluminum tube heating wire assembly is wrapped with a layer of copper foil.

[0010] Preferably, the temperature switch is electrically connected to the temperature controller.

[0011] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0012] This type of mechanical condenser temperature automatic control device can automatically and quickly return to the set state without manual adjustment when the ambient temperature, sample gas intake volume, and sample gas humidity of the condenser change. When the sample injection conditions change, the condenser's cooling temperature is 4℃±0.5℃, which has the advantages of good stability, high accuracy, and good controllability. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a workflow view of the present invention;

[0015] Figure 2 This is a structural view of the aluminum tube heating wire assembly of this utility model;

[0016] Figure 3 This is a schematic diagram of the temperature control circuit of this utility model.

[0017] The components include: 1. Compressor; 2. Cooler; 3. Expansion valve; 4. Evaporator and heat exchanger assembly; 5. Temperature measuring resistor; 6. Peristaltic pump; 7. Cold chamber body; 8. Liquid absorber; 9. Aluminum tube heating wire assembly; 10. Temperature switch; 11. Thermostat; 12. Condenser shell; 13. Sample gas inlet pipe; 14. Sample gas outlet pipe; 15. Cold chamber insulation layer; 901. Aluminum tube fittings; 902. Heating wire fittings. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] See Figure 1 and Figure 3 A mechanical condenser temperature automatic control device includes a condenser shell 12 and a cold cavity insulation layer 15. The cold cavity insulation layer 15 is disposed inside the condenser shell 12, and two interconnected cold cavity bodies 7 are disposed inside. One cold cavity body 7 is connected to a sample gas input pipe 13 and a peristaltic pump 6, and the other cold cavity body 7 is connected to a sample gas output pipe 14 and another peristaltic pump 6. Both cold cavity bodies 7 are wrapped in the middle of an aluminum tube heating wire assembly 9. An evaporator and heat exchanger assembly 4 is disposed outside the aluminum tube heating wire assembly 9. The aluminum tube heating wire assembly 9 is electrically connected to a temperature switch 10. The evaporator and heat exchanger assembly 4 is connected to a compressor 1 through a liquid absorber 8. The compressor 1 is connected to an expansion valve 3 through a cooler 2. The other end of the expansion valve 3 is connected to the evaporator and heat exchanger assembly 4. A temperature measuring resistor 5 is integrated inside the aluminum tube heating wire assembly 9.

[0020] See Figure 2 The aluminum tube heating wire assembly 9 includes an aluminum tube 901 and a heating wire 902. The aluminum tube heating wire assembly 9 is inserted into a mechanical cold trap and fits tightly against its inner wall. The cold cavity body 7 is inserted into the interior of the aluminum tube heating wire assembly 9. The exterior of the aluminum tube heating wire assembly 9 is provided with a spiral groove, which facilitates the embedding of the heating wire 902 into the aluminum tube heating wire assembly 9.

[0021] See Figure 2 The aluminum tube heating wire assembly 9 has a 3mm diameter hole for inserting a temperature measuring resistor 5 to measure the temperature. This setting facilitates real-time monitoring of the heating temperature of the aluminum tube heating wire assembly 9 using the temperature measuring resistor 5 and feeding the detection results back to the control terminal.

[0022] See Figure 2 The aluminum tube heating wire assembly 9 is wrapped with a layer of copper foil. This arrangement allows the outer surface of the aluminum tube heating wire assembly 9 to fit evenly and tightly with the evaporator and heat exchanger assembly 4.

[0023] See Figure 1 and 3 Temperature switch 10 is electrically connected to temperature controller 11. This setup allows temperature controller 11 to control the operation of aluminum tube heating wire assembly 9. Temperature switch 10 is normally closed, acting as a wire. When the temperature controller 11 causes the aluminum tube heating wire assembly 9 to overheat, potentially leading to safety hazards, temperature switch 10 will open, breaking the circuit of temperature controller 11 to control the aluminum tube heating wire assembly 9 and ensuring equipment safety.

[0024] Working principle: This utility model mainly consists of two parts when it is in operation: one is the refrigeration part.

[0025] In the flow path, high-temperature and high-pressure steam enters cooler 2 from the outlet of compressor 1. A bypass is led out between compressor 1 and cooler 2 to a pressure switch, which is used to control the rotation of the cooling fan of cooler 2. After being cooled and becoming liquid refrigerant, the refrigerant enters the evaporator and heat exchanger assembly 4 after being depressurized by expansion valve 3. At the evaporator and heat exchanger assembly 4, the low-pressure liquid refrigerant evaporates and absorbs heat from the evaporator and heat exchanger assembly 4. The heat is conducted through aluminum tube heating wire assembly 9 to cool the cold cavity body 7. The low-temperature and low-pressure steam line from the evaporator passes through liquid absorber 8 and then enters compressor 1, becoming high-temperature and high-pressure steam again. At the same time, in the circuit, compressor 1 is directly powered by 220V AC, and the cooling fan of cooler 2 is also powered by 220V AC, controlled by the normally open pressure switch between compressor 1 and cooler 2.

[0026] Second, the heating and temperature control section: Two aluminum tube heating wire assemblies 9 with evenly wound heating wires are wrapped with copper foil and coated with thermal grease evenly inside and out. The evaporator and heat exchanger assembly 4 is embedded in the condenser. The aluminum tube heating wire assembly 9 is embedded in two cold cavity bodies 7. The temperature measuring resistor 5 is located inside the aluminum tube heating wire assembly 9 near the middle of the two aluminum tubes. The temperature switch 10 is located between the two aluminum tube heating wire assemblies 9, at the upper part. The heating wires on the two aluminum tube heating wire assemblies 9 are connected in series through the temperature switch 10. One end is connected to the neutral wire, and the other end is connected to the controlled terminal of the solid-state relay. The other end of the controlled terminal of the solid-state relay is connected to the live wire. The temperature controller 11 is directly powered by 220V AC and connected to the temperature measuring resistor 5. It converts the temperature signal into an electrical signal and controls the closing of the controlled terminal of the solid-state relay through the PID temperature control algorithm. At the same time, in the sample gas flow path: the sample gas enters the condenser from the sample gas input pipe 13 and then passes through the two cold cavity bodies 7 in sequence to achieve secondary cooling. The condensate generated during the cooling process is discharged from the bottom of the cold cavity body 7 through the peristaltic pump 6.

[0027] In this specification, the terms "connection," "installation," "fixing," and "setting" are interpreted broadly. For example, "connection" can mean a fixed connection or an indirect connection via an intermediate component without affecting the relationship between components and the technical effect. It can also mean an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this utility model or utility model according to the specific circumstances. In this utility model, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this utility model and its embodiments and are not intended to limit the indicated device, element, or component to having a specific orientation or to be constructed and operated in a specific orientation. Finally, it should be noted that when describing the position of each component and the matching relationship between them, this utility model usually uses one or a pair of components as examples. However, those skilled in the art should understand that such positions and matching relationships also apply to other components / other pairs of components.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical condenser temperature automatic control device, characterized by: The application relates to a mechanical cold trap, which comprises a condenser shell (12) and a cold cavity thermal insulation layer (15) arranged in the condenser shell (12) and internally provided with two cold cavity bodies (7) in communication with each other, one of the cold cavity bodies (7) is communicated with a sample gas input pipe (13) and a peristaltic pump (6), the other cold cavity body (7) is communicated with a sample gas output pipe (14) and another peristaltic pump (6), the two cold cavity bodies (7) are wrapped in an aluminum pipe heating wire assembly (9), an evaporator and heat exchanger assembly (4) is arranged outside the aluminum pipe heating wire assembly (9), the aluminum pipe heating wire assembly (9) is electrically connected with a temperature switch (10), the evaporator and heat exchanger assembly (4) is communicated with a compressor (1) through a liquid absorber (8), the compressor (1) is communicated with an expansion valve (3) through a cooler (2), the other end of the expansion valve (3) is communicated with the evaporator and heat exchanger assembly (4), and a temperature measuring resistance (5) is integrated in the aluminum pipe heating wire assembly (9).

2. A mechanical condenser temperature automatic control device according to claim 1, characterized in that: The aluminum pipe heating wire assembly (9) comprises an aluminum pipe (901) and a heating wire (902), the aluminum pipe heating wire assembly (9) is inserted into a mechanical cold trap and closely adheres to the inner wall of the mechanical cold trap, the aluminum pipe heating wire assembly (9) is inserted into the cold cavity body (7), and the aluminum pipe heating wire assembly (9) is externally provided with a spiral groove.

3. A mechanical condenser temperature automatic control device according to claim 2, characterized in that: A hole with a diameter of 3mm is formed in the aluminum pipe heating wire assembly (9) for inserting the temperature measuring resistance (5) to measure temperature.

4. The mechanical condenser temperature automatic control device of claim 2, wherein: The aluminum pipe heating wire assembly (9) is wrapped with a copper foil.

5. The mechanical condenser temperature automatic control device of claim 1, wherein: The temperature switch (10) is electrically connected with a temperature controller (11).

Images