External circulation device for online monitoring and sampling of pure steam

Abstract

The present invention relates to an external circulation device for online monitoring and sampling of pure steam. The external circulation device for online monitoring and sampling of pure steam includes a sampler. The sampler includes a shell with a hollow interior and an external circulation pipe. A conductivity cell is arranged in the shell. The shell includes a top and a bottom arranged relatively. The top of the shell is used to pass pure steam or condensed water formed by pure steam. The conductivity cell is used to receive condensed water toward the top. A conductivity probe is arranged in the conductivity cell. The external circulation pipe is arranged outside the shell. The external circulation device for online monitoring and sampling of pure steam can prevent the condensed water remaining in the conductivity cell and the shell from breeding microorganisms due to long-term shutdown, and prevent the conductivity probe from monitoring the conductivity of the residual condensed water and causing the equipment to alarm. The condensed water in the conductivity cell is replaced quickly, ensuring that the monitored conductivity of the condensed water can well represent the purity of the pure steam.

Description

Technical Field

[0001] The invention relates to the technical field of pure steam monitoring and sampling, and in particular to an external circulation device for online monitoring and sampling of pure steam. Background Art

[0002] In the pharmaceutical production process, pure steam is also called clean steam or high-quality steam. The condensed water of pure steam needs to meet the requirements of the Chinese Pharmacopoeia for water for injection. Pure steam is mainly prepared by a pure steam generator. The main function of a pure steam generator is to continuously and stably distill raw water into pure steam that meets the requirements of the Pharmacopoeia.

[0003] The conductivity of pure steam is obtained through monitoring and sampling, and is used as data to judge the quality of pure steam. Pure steam is first condensed in the sampling condenser to form condensed water, which then flows into the sampler, and the condensed water is monitored and sampled in the sampler. Since the interior of the sampler is a large space cavity, the conductivity probe is directly set in the large space cavity to perform real-time conductivity monitoring. The sampling valve is set on the condensed water outflow pipe for offline sampling and detection. However, if the conductivity probe is directly set in the large space cavity, during the initial production or circulation stage of pure steam, the condensed water remaining in the large space cavity cannot be automatically discharged, and the conductivity will exceed the set standard value (the maximum value of the conductivity specified in the Chinese Pharmacopoeia is the set standard value), causing the equipment to alarm. Moreover, the condensed water flows slowly in the large space cavity, the condensed water is replaced slowly, and the monitored conductivity has errors, which cannot well characterize the purity of pure steam. Summary of the invention

[0004] Based on this, it is necessary to provide an external circulation device for online monitoring and sampling of pure steam to address the above technical problems, so as to avoid the situation in which the conductivity probe monitors the conductivity of residual condensed water and its value exceeds the set standard value during the initial production or circulation stage of pure steam, causing the equipment to alarm. In addition, the stable conductivity value of pure steam condensed water can be read in a very short time, thereby ensuring the accuracy of the conductivity test of pure steam condensed water and better characterizing the purity of the steam.

[0005] An external circulation device for online monitoring and sampling of pure steam, comprising:

[0006] A sampler, the sampler comprising a hollow shell, a conductivity cell arranged in the shell, the shell comprising a top and a bottom arranged opposite to each other, the top of the shell being used to pass pure steam or condensed water formed by pure steam; the conductivity cell facing the top being used to receive the condensed water, and a conductivity probe being arranged in the conductivity cell;

[0007] The sampler also includes an external circulation pipe, which is arranged outside the shell. The starting end of the external circulation pipe is connected to the bottom of the shell, and the end of the external circulation pipe is used to discharge the condensed water in the shell.

[0008] The technical solution is further described below:

[0009] In one embodiment, a first end cover and a second end cover are provided on the top of the shell, the first end cover and the second end cover are arranged at an interval, one side of the second end cover is arranged toward the conductivity cell, and the other side of the second end cover is arranged toward the first end cover, and the gap between the first end cover and the second end cover forms a condensate buffer chamber, and the end of the external circulation pipe is connected to the condensate buffer chamber.

[0010] In one of the embodiments, a condensate outlet is provided on the first end cover or the side wall of the condensate buffer chamber, and the condensate outlet is connected to the condensate buffer chamber. The condensate is discharged from the sampler in sequence through the end of the external circulation pipe, the condensate buffer chamber and the condensate outlet.

[0011] In one of the embodiments, a first exhaust hole is further provided on the second end cover, and the first exhaust hole is connected with the condensed water buffer chamber and the interior of the shell.

[0012] In one of the embodiments, a bottom cover is provided at the bottom of the shell, a first through hole is opened on the bottom cover, and the starting end of the external circulation pipe is connected to the interior of the shell through the first through hole.

[0013] In one of the embodiments, a sampling valve is further provided at the bottom of the shell, and the sampling valve is provided on the external circulation pipe and adjacent to the starting end of the external circulation pipe.

[0014] In one embodiment, the external circulation device for online monitoring and sampling of pure steam further comprises a pure steam condenser, wherein the pure steam condenser is arranged at the top of the shell, a pure steam inlet is arranged at one end of the pure steam condenser away from the sampler, a drainage tube is arranged at one end of the pure steam condenser facing the sampler, and the drainage tube sequentially passes through the first end cover and the second end cover and is inserted into the bottom of the conductivity cell.

[0015] In one embodiment, the conductivity cell is an L-shaped water tank, and a water inlet is provided at the end of the L-shaped water tank, and the water inlet is arranged toward the top of the shell; the drainage pipe extends into the water inlet and the drainage pipe is inserted to the bottom of the L-shaped water tank.

[0016] In one embodiment, the pure steam condenser is a spiral tube heat exchanger, and a cooling water outlet and a cooling water inlet are provided on the pure steam condenser. The pure steam condenser includes a shell side and a tube side, and the two ends of the tube side are respectively connected to the pure steam inlet and the drainage pipe, and the two ends of the shell side are respectively connected to the cooling water outlet and the cooling water inlet.

[0017] In one embodiment, the pure steam condenser and the first end cover of the sampler are spaced apart, and the gap between the pure steam condenser and the first end cover forms an air cooling cavity, which is used to form a first vent hole on the side wall of the air cooling cavity.

[0018] The above-mentioned external circulation device for online monitoring and sampling of pure steam has at least the following beneficial effects:

[0019] The external circulation device for online monitoring and sampling of pure steam provided in this embodiment includes a sampler, and a conductivity cell is arranged in the sampler. When the external circulation device for online monitoring and sampling of pure steam is turned on when the external circulation device for online monitoring and sampling of pure steam has not been used for a long time, pure steam can be introduced into the sampler first, and the pure steam flows from the top to the bottom of the sampler, and then discharged through the external circulation pipe and the condensed water outlet. In the process of introducing pure steam, the pure steam can purge the residual condensed water in the shell of the sampler, so that the condensed water is discharged through the external circulation pipe, and the microorganisms are prevented from growing in the conductivity cell and the residual condensed water in the shell due to long-term shutdown. At the same time, by using pure steam to purge the residual condensed water in the shell, it is avoided that the conductivity probe monitors the conductivity of the residual condensed water and causes the equipment to alarm.

[0020] The working process of the external circulation device for online monitoring and sampling of pure steam is as follows: first, the condensed water of pure steam is introduced from the top of the sampler, and the condensed water falls into the conductivity cell. When the conductivity cell is full, the condensed water will overflow into the inside of the shell until the inside of the shell is full of condensed water; then the condensed water continues to be introduced, and under the action of water pressure, the condensed water inside the shell enters the beginning of the external circulation pipe from the bottom of the shell, and the condensed water is discharged from the end of the external circulation pipe. In the above process, since the capacity of the conductivity cell is significantly smaller than the internal space of the shell, the condensed water can quickly fill the conductivity cell and overflow the conductivity cell, so that the condensed water in the conductivity cell is replaced quickly, ensuring that the monitored condensed water conductivity can well represent the purity of pure steam. In addition, the conductivity cell can be filled with condensed water in a short time, so that the conductivity probe can obtain a stable conductivity reading in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of an external circulation device for online monitoring and sampling of pure steam provided in one embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of an external circulation device for online monitoring and sampling of pure steam provided by one embodiment of the present invention from another perspective;

[0025] Figure 3 for Figure 2 The schematic diagram of the cross-sectional structure of the external circulation device for online monitoring and sampling of pure steam along the AA line is shown.

[0026] Explanation of the reference numerals: 100, sampler; 110, shell; 111, top; 112, bottom; 120, conductivity cell; 121, water inlet; 130, first end cover; 131, condensate outlet; 140, second end cover; 150, condensate buffer chamber; 160, bottom cover; 161, first through hole; 170, sampling valve; 180, conductivity probe; 190, external circulation pipe; 191, starting end; 192, end end; 200, pure steam condenser; 211, pure steam inlet; 212, cooling water outlet; 213, cooling water inlet; 220, drainage pipe; 230, air cooling chamber; 231, first vent. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0028] The present embodiment provides an external circulation device for online monitoring and sampling of pure steam, which has the advantages of avoiding the situation in which the conductivity probe monitors the conductivity of residual condensed water and its value exceeds the set standard value during the initial production or circulation stage of pure steam, thereby causing an equipment alarm. In addition, the stable conductivity value of pure steam condensed water can be read in a very short time, thereby ensuring the accuracy of the conductivity test of pure steam condensed water and better characterizing the purity of steam. This will be described in detail below in conjunction with the accompanying drawings.

[0029] In one embodiment, see Figures 1 to 3 , Figure 1 A schematic diagram of the structure of an external circulation device for online monitoring and sampling of pure steam provided by an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the structure of an external circulation device for online monitoring and sampling of pure steam provided by an embodiment of the present invention from another angle; Figure 3 Shows Figure 2 The schematic diagram of the cross-sectional structure of the external circulation device for online monitoring and sampling of pure steam along the AA line is shown. An external circulation device for online monitoring and sampling of pure steam includes a sampler 100. The sampler 100 also includes an external circulation pipe 190. The sampler 100 includes a hollow shell 110. A conductivity cell 120 is arranged in the shell 110. The shell 110 includes a top 111 and a bottom 112 arranged opposite to each other. The top 111 of the shell 110 is used to pass pure steam or condensed water formed by pure steam. The conductivity cell 120 is located in an upper position in the internal space of the shell 110, that is, the distance from the conductivity cell 120 to the top 111 is less than the distance from the conductivity cell 120 to the bottom 112, and the conductivity cell 120 faces the top 111 for receiving condensed water. The conductivity cell 120 is used to set a conductivity probe 180. The external circulation pipe 190 is arranged outside the shell 110. The starting end 191 of the outer circulation pipe 190 is connected to the bottom 112 of the housing 110. The terminal end 192 of the outer circulation pipe 190 is used to discharge the condensed water in the housing 110.

[0030] The external circulation device for online monitoring and sampling of pure steam provided in this embodiment includes a sampler 100, and a conductivity cell 120 is arranged in the sampler 100. When the external circulation device for online monitoring and sampling of pure steam is turned on when the external circulation device for online monitoring and sampling of pure steam has not been used for a long time, pure steam can be first introduced into the sampler 100, and the pure steam flows from the top 111 to the bottom 112 of the sampler 100, and then discharged through the external circulation pipe 190 and the condensed water outlet 131. In the process of introducing pure steam, the pure steam can purge the residual condensed water in the shell 110 of the sampler 100, so that the condensed water is discharged through the external circulation pipe 190, so as to avoid the breeding of microorganisms in the conductivity cell 120 and the shell 110 due to long-term shutdown. At the same time, by using pure steam to purge the residual condensed water in the shell 110, it is avoided that the conductivity probe 180 monitors the conductivity of the residual condensed water and causes the device to alarm.

[0031] The working process of the external circulation device for online monitoring and sampling of pure steam is as follows: first, condensed water of pure steam is introduced from the top 111 of the sampler 100, and the condensed water falls into the conductivity cell 120. When the conductivity cell 120 is full, the condensed water will overflow into the interior of the shell 110 until the interior of the shell 110 is full of condensed water; then the condensed water is continuously introduced, and under the action of water pressure, the condensed water inside the shell 110 enters the starting end 191 of the external circulation pipe 190 from the bottom 112 of the shell 110, and the condensed water is discharged from the end 192 of the external circulation pipe 190. In the above process, since the capacity of the conductivity cell 120 is significantly smaller than the internal space of the shell 110, the condensed water can quickly fill the conductivity cell 120 and overflow the conductivity cell 120, so that the condensed water in the conductivity cell 120 is replaced quickly, ensuring that the monitored condensed water conductivity can well represent the purity of the pure steam. In addition, the conductivity cell 120 can be filled with condensed water in a shorter time, so that the conductivity probe 180 can obtain a stable conductivity reading in a shorter time.

[0032] In one embodiment, see Figures 1 to 3 The top 111 of the housing 110 is provided with a first end cover 130 and a second end cover 140, the first end cover 130 and the second end cover 140 are arranged at intervals, one side of the second end cover 140 is arranged toward the conductivity cell 120, and the other side of the second end cover 140 is arranged toward the first end cover 130, and the gap between the first end cover 130 and the second end cover 140 forms a condensed water buffer chamber 150, and the end 192 of the external circulation pipe 190 is connected to the condensed water buffer chamber 150. Specifically, the first end cover 130 and the second end cover 140 are arranged in parallel and at intervals. In this way, when condensed water is introduced into the shell 110, the condensed water first fills the conductivity cell 120. When the conductivity cell 120 is full, the condensed water overflows into the shell 110 until the shell 110 is filled with condensed water. Then, the condensed water continues to be introduced. Under the action of water pressure, the condensed water in the shell 110 enters the starting end 191 of the outer circulation pipe 190 from the bottom 112 of the shell 110, and the condensed water flows into the condensed water buffer chamber 150 from the end 192 of the outer circulation pipe 190 for temporary storage.

[0033] For further information, see Figures 1 to 3, a condensate outlet 131 is provided on the side wall of the first end cover 130 or the condensate buffer chamber 150. The condensate outlet 131 is connected to the condensate buffer chamber 150. The condensate is discharged from the sampler 100 through the end 192 of the outer circulation pipe 190, the condensate buffer chamber 150 and the condensate outlet 131 in sequence. Specifically, the condensate outlet 131 can be provided on the first end cover 130 or on the side wall forming the condensate buffer chamber 150. In this way, the condensate inside the shell 110 enters the starting end 191 of the outer circulation pipe 190 from the bottom 112 of the shell 110, and the condensate flows into the condensate buffer chamber 150 from the end 192 of the outer circulation pipe 190, and then is discharged from the condensate outlet 131.

[0034] In one embodiment, see Figures 1 to 3 , the second end cover 140 is also provided with a first exhaust hole (not shown), and the first exhaust hole connects the condensate buffer chamber 150 and the interior of the shell 110. Specifically, the depth direction of the first exhaust hole is the same as the direction from the first end cover 130 to the second end cover 140. When the external circulation device for online monitoring and sampling of pure steam is in operation for a long time, condensate is continuously introduced into the sampler 100, and a small amount of non-condensable gas formed by pure steam is also mixed in the condensate, and these non-condensable gases finally gather at the top 111 of the shell 110, and enter the condensate buffer chamber 150 through the first exhaust hole, and then are discharged from the condensate outlet 131 connected to the condensate buffer chamber 150. The discharge of non-condensable gases is conducive to avoiding large deviations in the measured condensate conductivity values ​​and improving the monitoring accuracy of the condensate conductivity. In one embodiment, please refer to Figures 1 to 3 , a bottom cover 160 is provided at the bottom 112 of the housing 110. A first through hole 161 is provided on the bottom cover 160. The starting end 191 of the external circulation pipe 190 is connected to the inside of the housing 110 through the first through hole 161. Specifically, condensed water inside the housing 110 can flow to the starting end 191 of the external circulation pipe 190 through the first through hole 161, and then be discharged through the end 192 of the external circulation pipe 190.

[0035] In one embodiment, see Figures 1 to 3 The bottom 112 of the shell 110 is also provided with a sampling valve 170, which is arranged on the external circulation pipe 190 and adjacent to the starting end 191 of the external circulation pipe 190. The sampling valve 170 has two functions: first, after the condensed water fills the inside of the shell 110, if it is necessary to sample and test the condensed water, the sampling valve 170 can be opened to sample the condensed water; second, when the external circulation device for online monitoring and sampling of pure steam is not used for a long time, the sampling valve 170 can also be opened to empty the residual water inside the shell 110 to avoid the growth of bacteria.

[0036] In one embodiment, see Figures 1 to 3, the outer circulation device for online monitoring and sampling of pure steam also includes a pure steam condenser 200. The pure steam condenser 200 is arranged at the top 111 of the shell 110. A pure steam inlet 211 is provided at one end of the pure steam condenser 200 away from the sampler 100. A drainage pipe 220 is provided at one end of the pure steam condenser 200 facing the sampler 100. The drainage pipe 220 passes through the first end cover 130 and the second end cover 140 in sequence and is inserted into the bottom 112 of the conductivity cell 120. Specifically, the pure steam condenser 200 contains a spiral tube heat exchanger, and the pure steam condenser 200 is provided with a cooling water outlet 212 and a cooling water inlet 213. The pure steam condenser 200 includes a shell side and a tube side, and the two ends of the tube side are respectively connected to the pure steam inlet 211 and the drainage pipe 220, and the two ends of the shell side are respectively connected to the cooling water outlet 212 and the cooling water inlet 213. The drainage pipe 220 and the pipe side of the pure steam condenser 200 are an integrally formed structure. The heat of the pure steam in the pipe side is absorbed by the cooling water in the shell side, so that the pure steam becomes condensed water. The condensed water then flows from the drainage pipe 220 to the conductivity cell 120 of the sampler 100, and when the conductivity cell 120 is full, the condensed water will overflow into the shell 110 until the shell 110 is filled with condensed water. As the condensed water continues to flow from the drainage pipe 220 into the sampler 100, the condensed water inside the shell 110 is squeezed, so that the condensed water enters the starting end 191 of the outer circulation pipe 190 from the bottom 112 of the shell 110, and the condensed water flows from the outer circulation pipe 190 to the condensed water outlet 131 and is discharged. In the above process, since the capacity of the conductivity cell 120 is significantly smaller than the space inside the housing 110, the condensed water can quickly fill up the conductivity cell 120 and overflow, so that the condensed water in the conductivity cell 120 is replaced quickly, ensuring that the monitored condensed water conductivity can well represent the purity of pure steam. In addition, the conductivity cell 120 can be filled with condensed water in a relatively short time, so that the conductivity probe 180 can obtain a stable conductivity reading in a relatively short time.

[0037] For further information, see Figures 1 to 3 The cooling water outlet 212 is arranged at one end of the pure steam condenser 200 where the pure steam inlet 211 is arranged, and the cooling water inlet 213 is arranged at one end of the pure steam condenser 200 facing the sampler 100. In this way, the flow direction of the pure steam is opposite to the flow direction of the cooling water, and the cooling water absorbs the heat of the pure steam, so that the pure steam is condensed. The pure steam condenser 200 adopts a spiral tube heat exchanger, which is conducive to increasing the heat exchange area and improving the heat exchange efficiency. The water flow size of the cooling water inlet 213 and the cooling water outlet 212 is adjusted by the valves on the respective water supply pipelines. The valves can be pneumatic valves or mechanical valves, which are not specifically limited here.

[0038] In one embodiment, see Figures 1 to 3, the conductivity cell 120 is an L-shaped water tank. A water inlet 121 is provided at the end of the L-shaped water tank. The water inlet 121 is arranged toward the top 111 of the housing 110. The drainage tube 220 extends into the water inlet 121 and the drainage tube 220 is inserted into the bottom 112 of the L-shaped water tank. Specifically, the conductivity probe 180 can be arranged on the outer wall of the sampler 100, and one end of the conductivity probe 180 extends into the bottom 112 of the conductivity cell 120. Since the conductivity cell 120 is an L-shaped water tank, the water at the bottom 112 of the L-shaped water tank can be in a relatively stable state, which is convenient for the conductivity probe 180 to measure a stable conductivity value.

[0039] In one embodiment, see Figures 1 to 3 , the pure steam condenser 200 and the first end cover 130 of the sampler 100 are arranged at intervals. The gap between the pure steam condenser 200 and the first end cover 130 forms an air cooling chamber 230, and a first vent 231 is provided on the side wall for forming the air cooling chamber 230. Specifically, the first vent 231 connects the air cooling chamber 230 with the external environment, so that the external air can enter the air cooling chamber 230. Since the condensed water in the condensed water buffer chamber 150 is higher in temperature than the cooling water in the pure steam condenser 200, the setting of the air cooling chamber 230 separates the pure steam condenser 200 and the condensed water buffer chamber 150, thereby reducing the temperature influence of the condensed water in the condensed water buffer chamber 150 on the cooling water in the shell side of the pure steam condenser 200. In addition, the air in the air cooling chamber 230 is affected by the temperature of the cooling water, and air condensation water can be formed. The setting of the first vent 231 is also conducive to discharging the air condensation water in the air cooling chamber 230.

[0040] The external circulation device for online monitoring and sampling of pure steam provided in this embodiment can prevent the condensed water remaining in the conductivity cell 120 and the shell 110 from breeding microorganisms due to long-term shutdown. At the same time, by using pure steam to purge the residual condensed water inside the shell 110, it is prevented that the conductivity probe 180 monitors the conductivity of the residual condensed water and causes the equipment alarm. The condensed water in the conductivity cell 120 is replaced quickly, ensuring that the monitored condensed water conductivity can well represent the purity of the pure steam. In addition, the conductivity cell 120 can be filled with condensed water in a relatively short time, so that the conductivity probe 180 can obtain a stable conductivity reading in a relatively short time.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. An external circulation device for online monitoring and sampling of pure steam, characterized in that: The external circulation device for online monitoring and sampling of pure steam comprises: A sampler, the sampler comprises a hollow shell, a conductivity cell is arranged in the shell, the shell comprises a top and a bottom arranged oppositely, the top is used to pass pure steam or condensed water formed by pure steam; the conductivity cell faces the top to receive the condensed water, the capacity of the conductivity cell is significantly smaller than the internal space of the shell, so that the condensed water quickly fills the conductivity cell and overflows into the shell, so that the condensed water in the conductivity cell is replaced faster; the conductivity cell is used to set a conductivity probe; The sampler also includes an external circulation pipe, which is arranged outside the shell. The starting end of the external circulation pipe is connected to the bottom of the shell, and the end of the external circulation pipe is used to discharge the condensed water in the shell.

2. The external circulation device for online monitoring and sampling of pure steam according to claim 1 is characterized in that: The top of the shell is provided with a first end cover and a second end cover, the first end cover and the second end cover are spaced apart, one side of the second end cover is arranged toward the conductivity cell, and the other side of the second end cover is arranged toward the first end cover, the gap between the first end cover and the second end cover forms a condensed water buffer chamber, and the terminal is connected to the condensed water buffer chamber.

3. The external circulation device for online monitoring and sampling of pure steam according to claim 2 is characterized in that: The first end cover is provided with a condensate outlet or a condensate outlet is provided on the side wall of the condensate buffer chamber, the condensate outlet is connected to the condensate buffer chamber, and the condensate is discharged from the sampler in sequence through the end of the external circulation pipe, the condensate buffer chamber and the condensate outlet.

4. The external circulation device for online monitoring and sampling of pure steam according to claim 2 is characterized in that: The second end cover is also provided with a first exhaust hole, and the first exhaust hole is connected with the condensed water buffer cavity and the interior of the shell.

5. The external circulation device for online monitoring and sampling of pure steam according to claim 1 is characterized in that: A bottom cover is provided at the bottom of the shell, a first through hole is opened on the bottom cover, and the starting end of the external circulation pipe is connected to the interior of the shell through the first through hole.

6. The external circulation device for online monitoring and sampling of pure steam according to claim 5 is characterized in that: A sampling valve is also provided at the bottom of the shell, and the sampling valve is arranged on the external circulation pipe and adjacent to the starting end of the external circulation pipe.

7. The external circulation device for online monitoring and sampling of pure steam according to claim 2 is characterized in that: The external circulation device for online monitoring and sampling of pure steam also includes a pure steam condenser, which is arranged at the top of the shell, and a pure steam inlet is arranged at one end of the pure steam condenser away from the sampler, and a drainage tube is arranged at one end of the pure steam condenser facing the sampler, and the drainage tube passes through the first end cover and the second end cover in sequence and is inserted into the bottom of the conductivity cell.

8. The external circulation device for online monitoring and sampling of pure steam according to claim 7, characterized in that: The conductivity cell is an L-shaped water tank, and a water inlet is provided at the end of the L-shaped water tank, and the water inlet is arranged toward the top of the shell; the drainage pipe extends into the water inlet and the drainage pipe is inserted to the bottom of the L-shaped water tank.

9. The external circulation device for online monitoring and sampling of pure steam according to claim 7, characterized in that: The pure steam condenser is a spiral tube heat exchanger, and is provided with a cooling water outlet and a cooling water inlet. The pure steam condenser comprises a shell side and a tube side, and the two ends of the tube side are respectively connected to the pure steam inlet and the drainage pipe, and the two ends of the shell side are respectively connected to the cooling water outlet and the cooling water inlet.

10. The external circulation device for online monitoring and sampling of pure steam according to any one of claims 7 to 9, characterized in that: The pure steam condenser and the first end cover of the sampler are arranged at intervals, and the gap between the pure steam condenser and the first end cover forms an air cooling cavity, and a first vent hole is provided on the side wall of the air cooling cavity.

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