Intelligent synchronous online detection device and method for hydrogen chloride content and free chlorine content

Abstract

The invention relates to the technical field of hydrogen chloride detection, in particular to an intelligent synchronous online detection device and method for the content of hydrogen chloride and the content of free chlorine, and the intelligent synchronous online detection device comprises a sampling control box mounted near an outlet pipeline of a field hydrogen chloride synthesis furnace and a program control and data processing end mounted in a safety area control room; the sampling control box is connected with the program control and data processing end through a multi-core cable; the sampling control box adopts a design thought that hardware is matched with software, so that a function of synchronously detecting the hydrogen chloride content and the free chlorine content of hydrogen chloride is realized. The design concept of an integrated circuit is introduced, main detection units are designed in a modularized mode, the size is small, abrasion is small, corrosion resistance is achieved, zero leakage of a control valve module is achieved, physical isolation of a detection gas loop, a detection water loop and a detection light loop is achieved, corrosion and blocking are greatly reduced, and the service life of the device is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen chloride detection, and in particular to an intelligent synchronous online detection device and method for hydrogen chloride content and free chlorine content. Background Art

[0002] The hydrogen chloride synthesis process is a dangerous process that requires key monitoring. Chlorine is a toxic and corrosive gas, and hydrogen is a flammable and explosive gas. After the pressure of the two is stabilized in the buffer tank, they are respectively regulated and controlled by the chlorine (CL2) regulating valve and the hydrogen (H2) regulating valve, and enter the hydrogen chloride synthesis furnace in a certain ratio to burn and generate hydrogen chloride gas. The ratio is usually 1:1.1, and hydrogen is appropriately excessive. Due to the influence of various factors such as raw materials and process fluctuations, free chlorine will also be produced while generating hydrogen chloride gas. The difference between the hydrogen chloride content and the free chlorine content of hydrogen chloride will not only pose a danger to the synthesis furnace itself, but also have a serious impact on subsequent production and equipment.

[0003] There are two common methods for monitoring hydrogen chloride and free chlorine content in hydrogen chloride in the industry: one is manual analysis and observation. The disadvantage is that the operator needs to operate in the dangerous area on site for a long time and frequently. The monitoring results are affected by the subjective factors of the operator and cannot be continuously detected online; the other is direct or indirect online analysis of a single item, either hydrogen chloride or free chlorine. The disadvantage is that the hydrogen chloride content and the free chlorine content of hydrogen chloride cannot be detected simultaneously, and the synthetic combustion of hydrogen chloride cannot be reflected in real time and comprehensively. In addition, there are many equipment parts installed in the corrosive environment on site, which are difficult to protect and maintain, and the equipment investment is large. In particular, the hydrogen chloride medium containing recovered tail gas is very easy to corrode and block the detection circuit, seriously affecting the normal operation of the equipment. Summary of the invention

[0004] The object of the present invention is to provide an intelligent synchronous online detection device and method for hydrogen chloride content and free chlorine content to solve the problems raised in the above background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions: One of the purposes of the present invention is to provide an intelligent synchronous online detection device for hydrogen chloride content and free chlorine content, comprising a sampling control box and a program control and data processing terminal electrically connected thereto; The sampling control box includes a box body 12 and a pressure balance circuit arranged therein, a detection module 05 for detecting the content of hydrogen chloride and free chlorine, and a gas guide component and a reagent guide component controlled by a program control and data processing terminal and connected to the detection module 05, wherein the pressure balance circuit is connected to the reagent guide component; The box 12 is connected to the outlet pipeline of the hydrogen chloride synthesis furnace through a sampling tube. The sampling tube is provided with a flow meter 01 for detecting the flow rate of hydrogen chloride gas. The hydrogen chloride gas flowing out of the outlet of the hydrogen chloride synthesis furnace enters the detection module 05 through the sampling tube and the gas guide component. When the hydrogen chloride gas fills the reaction pool, the valve of the gas guide component is closed; the reagent enters the detection module 05 through the reagent guide component to fully react and absorb with the hydrogen chloride gas; due to the physical property that hydrogen chloride gas is very soluble in water, the hydrogen chloride gas and the water in the reagent fully react to form hydrochloric acid and are absorbed and dissolved in water. The reduction in the volume of the hydrogen chloride gas in the sealed reaction pool is equal to the volume of the reagent entering the reaction pool 054, that is, the ratio of the volume of the reagent entering the reaction pool 054 to the volume of the sampled hydrogen chloride gas is equal to the purity of the hydrogen chloride. In addition to hydrogen chloride and free chlorine, the hydrogen chloride gas components in the sampling also include hydrogen, but hydrogen is extremely difficult to dissolve in water, and the volume absorbed by the reagent can be ignored. In addition, the content of other impurities is very small, and the absorption by water and the impact on the measurement accuracy can also be ignored.

[0006] The detection module 05 includes a sealed box 051, a light source 052 on one side of the sealed box 051, a light sensor 053 for detecting the free chlorine content arranged opposite to the light source 052 on the other side of the sealed box 051, and a transparent reaction pool 054 between the light source 052 and the light sensor 053; due to the chemical property that free chlorine changes the color of the starch potassium iodide solution, the hydrogen chloride gas containing free chlorine and the reagent containing starch potassium iodide react in the reaction pool, and the amount of light absorbed by the reaction mixture formed is linearly proportional to the free chlorine content; if there is no free chlorine, the liquid is transparent and colorless, and if there is free chlorine, the liquid changes from purple to black. The higher the free chlorine content, the darker the color of the liquid and the less light passes through. The transparent reaction pool 054 adopts a pressure-resistant closed structure.

[0007] The reagent delivery assembly is provided with a pressure transmitter 091 for detecting the hydrogen chloride content; the pressure transmitter 091 detects the liquid level of the pressure balance tube 13 (pressure P = liquid density ρ * gravity acceleration g * liquid level height h), and the liquid level height is proportional to the volume; the pressure transmitter 091 calculates the volume of the reagent sent into the reaction tank 054 according to the pressure change, and the volume of the reagent sent into the reaction tank 054 is the volume of the absorbed hydrogen chloride gas; and then the hydrogen chloride gas content is calculated by the ratio with the sampling volume.

[0008] The data detected by the flow meter 1, the optical sensor 053 and the pressure transmitter 091 are continuously transmitted to the program control and data processing end.

[0009] Furthermore, the gas delivery component includes valve 1 02, valve 2 03 and valve 3 06 connected in sequence, wherein the valve 2 03 is connected to the gas inlet of the detection module 05, the inlet of the valve 3 06 is connected to the gas outlet of the detection module 05, and the outlet of the valve 3 06 is connected to the recovery system. After the detection is completed, the reaction mixture of hydrogen chloride and the reagent is discharged into the factory recovery system through the outlet of the valve 3.

[0010] Furthermore, the reagent guiding assembly includes valve four 11, valve five 10, valve seven 09 and valve six 04 connected in sequence, the valve six 04 is connected to the liquid inlet end of the detection module 05, the valve seven 09 is a five-way balancing valve, and the five-way balancing valve assembly is provided with a pressure transmitter 091.

[0011] Furthermore, the pressure balance circuit includes valve seven 09, pressure balance pipe one 13, pressure balance pipe two 14, and valve eight 08 connected in this way, and the outlet of valve eight 08 is connected to the outside atmospheric pressure. The specific working process of the pressure balance circuit is: before the detection reagent enters the detection module 05, it first enters the pressure balance pipe one 13. At this time, the three valves of valve four 11, valve five 10, and valve eight 08 are in an open state, and its pressure is balanced by valve seven 09, pressure balance pipe one 13, and pressure balance pipe two 14. The pressure transmitter 091 on valve seven 09 can detect the height of the liquid added to the pressure balance pipe one 13 (P=ρ*g*h). The liquid level is proportional to the volume (unit: ml). When the pressure reaches the set value, valve four 11, valve five 10, and valve eight 08 are closed, and the system is no longer affected by external pressure, but is in a relatively stable state and isolated from the outside world to prevent corrosive gases in the corrosive environment from entering the equipment. When it is necessary to add reagents to the reaction pool 054 of the detection module 05, the valve 604 and the valve 808 are opened again until the hydrogen chloride gas is fully absorbed and completely dissolved in the water, the detection module 05 no longer enters the water, the liquid level of the pressure balance pipe 13 no longer changes, and when the pressure reaches a state of equilibrium with the atmospheric pressure, the valve 604 and the valve 808 are closed. The pressure transmitter calculates the volume of the reagent sent into the reaction pool 054 according to the pressure change, and the volume of the reagent sent into the reaction pool is the volume of the hydrogen chloride gas absorbed; and then the hydrogen chloride gas content is calculated by the ratio with the sampling volume.

[0012] Furthermore, the box 12 is also provided with a wiring module 07, and the wiring module 07 is electrically connected to the program control and data processing terminal. The wiring module 07 in the box 12, i.e., the wiring terminal, is used to connect the wires of the valve in the box, the pressure transmitter 091, and the light sensor 053, and then the wiring module 07 is connected to the program control and data processing terminal with a multi-core cable of the same specification. The wires of the flow meter are separately fed into the program control and data processing terminal.

[0013] Furthermore, the reagent is a starch potassium iodide aqueous solution. Hydrogen chloride gas and potassium iodide solution are mixed in a reaction tank. The reaction tank is originally transparent. If the hydrogen chloride gas contains free chlorine, the starch potassium iodide solution turns purple; if the hydrogen chloride gas contains too much chlorine, the starch potassium iodide solution turns black.

[0014] Furthermore, the program control and data processing end is installed in a control room in a safe area, specifically a CPU controller, which controls the opening and closing sequence and time of the valves in the box, and analyzes and processes the continuously received flow meter data, light sensor data and pressure transmitter data, thereby completing data display and self-diagnosis; the data interface of the program control and data processing end synchronously exchanges data with the factory's DCS system, and adjusts the opening size of the feed valve of the hydrogen chloride synthesis furnace in real time to keep the hydrogen chloride synthesis furnace in the best operating state.

[0015] Another object of the present invention is to provide a detection method of an intelligent synchronous online detection device for hydrogen chloride content and free chlorine content, comprising the following steps: S1: The hydrogen chloride gas flowing out of the hydrogen chloride synthesis furnace outlet flows through the sampling tube, and the flow meter 01 detects the flow rate of the hydrogen chloride gas and transmits the flow rate signal to the program control and data processing end; S2: The hydrogen chloride gas flowing through the sampling tube enters the reaction pool in the detection module 05 through the gas guide component; S3: The reagent enters the reaction pool 054 in the detection module 05 through the reagent guide assembly; S4: Hydrogen chloride gas containing free chlorine and a reagent containing starch potassium iodide react in a reaction tank 054. Due to the chemical property that free chlorine changes the color of starch potassium iodide solution, the amount of light absorbed by the reaction mixture formed is linearly proportional to the free chlorine content. The light sensor 053 detects the change in light intensity to characterize the free chlorine content and transmits it to the program control and data processing end in the form of a detection current. S5: Hydrogen chloride gas and water in the reagent fully react to form hydrochloric acid which is absorbed and dissolved in water. Due to the physical property that hydrogen chloride gas is very soluble in water, the reduction in the volume of hydrogen chloride gas in the sealed reaction pool 054 is equal to the volume of the reagent entering the reaction pool, that is, the ratio of the volume of the reagent entering the reaction pool to the volume of the sampled hydrogen chloride gas is equal to the purity of hydrogen chloride; the pressure change caused by the reagent entering the reaction pool is transmitted to the program control and data processing end through the detection current of the pressure transmitter, and the volume of the reagent entering the reaction pool and the purity of hydrogen chloride are calculated; S6: The program control and data processing end analyzes and processes the received data, thereby completing data display and self-diagnosis; the data interface of the program control and data processing end synchronously exchanges data with the DCS system of the factory, and adjusts the opening size of the feed valve of the hydrogen chloride synthesis furnace in real time, so that the hydrogen chloride synthesis furnace is in the best operating state. Further, the specific process of the reagent in S3 entering the reaction pool in the detection module 05 through the reagent guide assembly is: the reagent flows through valve four 11, valve five 10, valve seven 09, pressure balance pipe one 13, valve seven 09, valve six 04 in sequence to enter the reaction pool in the detection module 05. The flow rate and pressure of the external test reagent when entering the system will change at any time, and the fluctuation is relatively large. If it enters the detection module 05 directly, the impact caused is relatively large, which is not conducive to fully absorbing the reaction; so the detection reagent first enters the pressure balance pipe one 13, and after being isolated from the outside world, it is steadily added to the detection module 05 by the pressure balance pipe one 13.

[0016] Furthermore, after the hydrogen chloride gas in S2 enters the reaction pool in the detection module 05, valve one 02, valve two 03 and valve three 06 are closed to ensure that the hydrogen chloride gas in the reaction pool fills the reaction pool and is sealed and fixed, and then S3 is performed to send the reagent into the reaction pool.

[0017] Furthermore, to ensure the accuracy of the data, before the hydrogen chloride gas enters the reaction pool, the optical sensor and pressure transmitter transmit the detection data to the program control and data processing end for storage and processing, and use calculations to eliminate zero drift. The main factors causing zero drift in the detection of hydrogen chloride content are the pressure caused by the residual liquid (or a small amount of gas) in the pipeline and the zero drift of the transmitter itself. The main factors causing zero drift in the detection of free chlorine are the attenuation of the light source and the small amount of attachments on the pipeline blocking the transmission of light.

[0018] Furthermore, the pressure transmitter and the light sensor are both connected to the wiring module in a standard current signal (4-20 mA) mode, and then input to the program control and data processing end through a cable.

[0019] Furthermore, the self-diagnosis function of the program control and data processing end will perform calculations and judgments based on the test results of the hydrogen chloride content and the free chlorine content in hydrogen chloride, the hydrogen chloride gas sampling flow rate and the various temperature, pressure and flow parameters of the synthesis furnace obtained by exchanging data with the factory DCS, determine the operating status of the equipment and correct the measured values ​​in a timely manner.

[0020] The reason for pipeline blockage in the prior art is that trace elements in the detection gas react with water molecules to form tiny solid particles. The sampling circuit of this system is isolated from the reagent adding circuit and isolated from the air during the absorption reaction, reducing the contact with water molecules when not working. The straight-through design of the sampling circuit itself has a self-cleaning function, which greatly reduces the occurrence of blockage.

[0021] Beneficial effects of the present invention: 1. The detection device of the present invention uses a design concept of hardware matching software, fully realizes the synchronous detection function of hydrogen chloride content and hydrogen chloride free chlorine content, solves the zero drift problem in automatic control, automatically eliminates the measurement error caused by zero drift, and meets the needs of automatic control of production.

[0022] 2. The present invention introduces the design concept of integrated circuits. The main detection unit is modularly designed with small size and low wear. The main material of the valve is polytetrafluoroethylene, which is corrosion-resistant. The valve module adopts a diaphragm valve, and the diaphragm adopts fluororubber to achieve zero leakage. The detection gas circuit, detection reagent circuit, and detection light circuit are all physically isolated, which greatly reduces corrosion and blockage, and reduces the requirements of the corresponding electrical components on the working conditions, thereby extending the service life of the device.

[0023] 3. The self-diagnosis function introduced in the present invention enables timely feedback and adjustment of the equipment's operating status, so that operators can timely predict and respond to various emergencies; it provides important technical support for the factory's safe production and digital construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a schematic diagram of the structure of the overall installation arrangement of the present invention; Figure 2 It is a structural schematic diagram of the sampling control box in the present invention; Figure 3 It is a schematic diagram of the detection module; Figure 4 This is a schematic diagram of the connection of a five-way balancing valve; The reference numerals in the figures are as follows: 01 - flow meter, 02 - valve one, 03 - valve two, 04 - valve six, 05 - detection module, 06 - valve three, 07 - wiring module, 08 - valve eight, 09 - valve seven, 10 - valve five, 11 - valve four, 12 - box, 13 - pressure balance pipe one, 14 - pressure balance pipe two; 15 - pipeline; 051- sealed box, 052- light source, 053- light sensor, 054 reaction pool; 091-Pressure transmitter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 and Figure 2 , an intelligent synchronous online detection device for hydrogen chloride content and free chlorine content, including a sampling control box arranged near the outlet pipeline of the hydrogen chloride synthesis furnace on site and a program control and data processing terminal electrically connected to the sampling control box and arranged in a control room.

[0027] The sampling control box includes a box body 12, a sampling tube is connected to the box body 12 and the sampling tube is provided with a flow meter 01 for detecting the flow rate of hydrogen chloride gas. The box body 12 is provided with a pressure balance circuit, a detection module 05 for reaction absorption, and a gas guide component and a reagent guide component controlled by a program control and data processing end and connected to the detection module 05. The pressure balance circuit is connected to the reagent guide component; The gas guiding component includes valve one 02, valve two 03 and valve three 06 connected in sequence, the valve two 03 is connected to the air inlet end of the detection module 05, the inlet of the valve three 06 is connected to the air outlet end of the detection module 05, and the outlet of the valve three 06 is connected to the recovery system.

[0028] The reagent delivery component includes valve four 11, valve five 10, valve seven 09 and valve six 04 connected in sequence, the valve six 04 is connected to the liquid inlet end of the detection module 05, the valve seven 09 is a five-way balancing valve, and a pressure transmitter is provided in the five-way balancing valve.

[0029] The pressure balancing circuit includes valve seven 09, pressure balancing pipe one 13, pressure balancing pipe two 14, and valve eight 08 connected in sequence, and the outlet of valve eight 08 is connected to the external atmospheric pressure.

[0030] The box 12 is also provided with a wiring module 07, which is electrically connected to the program control and data processing terminal. The wiring module 07 in the box 12, i.e., the wiring terminal, is used to connect the wires of the valve, pressure transmitter, and light sensor in the box, and then the wiring module 07 is connected to the program control and data processing terminal with a cable of the same specification.

[0031] The hydrogen chloride gas flowing out of the hydrogen chloride synthesis furnace outlet enters the detection module 05 through the sampling tube and the gas guide component, and the reagent enters the detection module 05 through the reagent guide component to fully react with the hydrogen chloride gas; the reagent is a starch potassium iodide aqueous solution.

[0032] like Figure 3 As shown, the detection module 05 includes a sealed box 051, a light source 052 on one side of the sealed box 051, a light sensor 053 for detecting free chlorine content arranged opposite to the light source 052 on the other side of the sealed box 051, and a sealed transparent reaction pool 054 between the light source 052 and the light sensor 053; like Figure 4 As shown, the five-way balancing valve is provided with a pressure transmitter 091 (pressure P = liquid density ρ * gravitational acceleration g * liquid level height h) for detecting the height of the liquid level 13. Due to the physical property that hydrogen chloride gas is very easily soluble in water, the reduction in the volume of hydrogen chloride gas in the sealed reaction tank 054 is equal to the volume of the reagent entering the reaction tank 054, and the liquid level is proportional to the volume; the pressure transmitter 091 calculates the volume of the reagent sent into the reaction tank according to the pressure change, and the volume of the reagent sent into the reaction tank 054 is the volume of the hydrogen chloride gas absorbed; and then the hydrogen chloride gas content is calculated by the ratio with the sampling volume.

[0033] The pressure transmitter and the light sensor are both connected to the wiring module 07 in the mode of standard current signal (4-20mA), and then input to the program control and data processing end through a multi-core cable.

[0034] A detection method of an intelligent synchronous online detection device for hydrogen chloride content and free chlorine content, comprising the following steps: S1: The hydrogen chloride gas flowing out of the hydrogen chloride synthesis furnace outlet flows through the sampling tube, and the flow meter 01 detects the flow rate of the hydrogen chloride gas and transmits the flow rate signal to the program control and data processing end; S2: The hydrogen chloride gas flowing through the sampling tube enters through the gas guide assembly and fills the reaction pool in the detection module 05; then valve 1 02, valve 2 03 and valve 3 06 are closed; S3: The reagent enters the reaction pool in the detection module 05 through the reagent guide component; the specific process is: the reagent flows through valve four 11, valve five 10, valve seven 09, pressure balance pipe one 13, valve seven 09, valve six 04 in turn and enters the reaction pool 054 in the detection module 05.

[0035] S4: Hydrogen chloride gas and reagents fully react in reaction tank 054. Due to the chemical property that free chlorine changes the color of starch potassium iodide solution, the liquid is transparent and colorless without free chlorine, and the liquid changes from purple to black with free chlorine. The higher the free chlorine content, the darker the color of the liquid and the less light passes through. The light sensor 053 detects the change in light intensity and transmits it to the program control and data processing end in the form of detection current (4-20mA) to characterize the free chlorine content.

[0036] S5: Hydrogen chloride gas and reagent water fully react to form hydrochloric acid which is absorbed and dissolved in water. Due to the physical property that hydrogen chloride gas is very soluble in water, the reduction in the volume of hydrogen chloride gas in the sealed reaction tank is equal to the volume of the reagent entering the reaction tank. The reagent liquid level is proportional to the volume and the liquid level is proportional to the pressure. The volume change is detected by the pressure transmitter 091 and transmitted to the program control and data processing end in the form of detection current (4-20mA) to characterize the hydrogen chloride gas content.

[0037] S6: The program control and data processing end analyzes and processes the data received from the 07 terminal and the 01 flow meter, thereby completing data display and self-diagnosis; the data interface of the program control and data processing end synchronously exchanges data with the factory's DCS system, and adjusts the opening size of the CL2 and H2 feed valves of the hydrogen chloride synthesis furnace in real time to keep the hydrogen chloride synthesis furnace in the best operating state.

[0038] Furthermore, to ensure the accuracy of the data, before the hydrogen chloride gas enters the reaction tank, the optical sensor 053 and the pressure transmitter 091 transmit the detection data to the program control and data processing end for storage and processing, and are used to eliminate zero drift through calculation.

[0039] Among them, in the program control and data processing end, the CPU controller and peripheral circuits complete the action program control of all valve modules, complete the basic functions of analysis and processing of all data and display and alarm control, and perform self-diagnosis functions. At the same time, the data interface of the program control and data processing end synchronizes data exchange with the factory's DCS system, and adjusts the opening size of the CL2 and H2 feed valves of the hydrogen chloride synthesis furnace in real time to keep the hydrogen chloride synthesis furnace in the best operating state.

[0040] Among them, the synchronously running self-diagnosis function will perform calculations and judgments based on the detection results of hydrogen chloride content and free chlorine content in hydrogen chloride, the sampling flow rate, and various temperature, pressure and flow parameters of the synthesis furnace obtained by exchanging data with the factory DCS, determine the operating status of the equipment and correct the measured values ​​in time.

[0041] The self-diagnosis function enables timely feedback and adjustment of the equipment's operating status, allowing operators to predict and respond to various emergencies in a timely manner; it provides important technical support for the factory's safe production and digital construction.

[0042] Therefore, the intelligent synchronous online detection device for hydrogen chloride content and hydrogen chloride free chlorine content provided by the present invention combines optical technology, electromechanical technology and digital technology, etc., so that the overall equipment meets the expected design requirements and provides a new process detection idea and equipment for the hydrogen chloride synthesis process.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An intelligent synchronous online detection device for hydrogen chloride content and free chlorine content, characterized in that: It includes a sampling control box and a program control and data processing terminal electrically connected thereto; The sampling control box comprises a box body (12) and a pressure balance circuit arranged therein, a detection module (05) for detecting the content of hydrogen chloride and free chlorine, and a gas guide component and a reagent guide component controlled by a program control and data processing end and connected to the detection module (05), wherein the pressure balance circuit is connected to the reagent guide component; The box (12) is connected to the outlet pipeline of the hydrogen chloride synthesis furnace via a sampling tube, and the sampling tube is provided with a flow meter (1) for detecting the flow rate of hydrogen chloride gas. The hydrogen chloride gas flowing out of the outlet of the hydrogen chloride synthesis furnace enters the detection module (05) via the sampling tube and the gas guide component, and the reagent enters the detection module (05) via the reagent guide component to react and absorb with the hydrogen chloride gas. The detection module (05) comprises a sealed box (051), a light source (052) on one side of the sealed box (051), a light sensor (053) for detecting free chlorine content arranged opposite to the light source (052) on the other side of the sealed box (051), and a sealed transparent reaction pool (054) arranged between the light source (052) and the light sensor (053); The reagent delivery assembly is provided with a pressure transmitter (091) for detecting the content of hydrogen chloride; The data detected by the flow meter (1), the light sensor (053) and the pressure transmitter (091) are transmitted to the program control and data processing end.

2. The intelligent synchronous online detection device for hydrogen chloride content and free chlorine content according to claim 1 is characterized in that: The gas guiding component comprises valve one (02), valve two (03) and valve three (06) which are connected in sequence, wherein valve two (03) is connected to the air inlet end of the detection module (05), the air outlet end of the detection module (05) is connected to the inlet of valve three (06), and the outlet of valve three (06) is connected to the recovery system.

3. The intelligent synchronous online detection device for hydrogen chloride content and free chlorine content according to claim 2 is characterized in that: The reagent delivery assembly comprises valve four (11), valve five (10), valve seven (09) and valve six (04) which are connected in sequence, wherein valve six (04) is connected to the liquid inlet end of the detection module (05), and valve seven (09) is a five-way balancing valve, in which a pressure transmitter (091) is arranged.

4. The intelligent synchronous online detection device for hydrogen chloride content and free chlorine content according to claim 3 is characterized in that: The pressure balancing circuit comprises valve seven (09), pressure balancing pipe one (13), pressure balancing pipe two (14), and valve eight (08) connected in sequence, and the outlet of valve eight (08) is connected to the external atmospheric pressure.

5. The intelligent synchronous online detection device for hydrogen chloride content and free chlorine content according to claim 1 is characterized in that: A wiring module (07) is also provided in the box (12), and the wiring module (07) is electrically connected to the program control and data processing terminal.

6. The intelligent synchronous online detection device for hydrogen chloride content and free chlorine content according to claim 1 is characterized in that: The reagent is a starch potassium iodide aqueous solution.

7. A detection method of the intelligent synchronous online detection device for hydrogen chloride content and free chlorine content as claimed in claim 4, characterized in that: The following steps are involved: S1: The hydrogen chloride gas flowing out of the hydrogen chloride synthesis furnace outlet flows through the sampling tube, and the flow meter (01) detects the flow rate of the hydrogen chloride gas and transmits the flow rate signal to the program control and data processing end; S2: The hydrogen chloride gas flowing through the sampling tube enters the reaction pool in the detection module (05) through the gas guide component; S3: The reagent enters the reaction pool (054) in the detection module (05) through the reagent guide assembly; S4: Hydrogen chloride gas containing free chlorine and a reagent containing starch potassium iodide react in a reaction tank (054). Due to the chemical property that free chlorine changes the color of starch potassium iodide solution, the amount of light absorbed by the reaction mixture formed is linearly proportional to the free chlorine content. The free chlorine content is characterized by detecting the change in light intensity through a light sensor (053) and transmitting it to the program control and data processing end in the form of a detection current. S5: The hydrogen chloride gas and the water in the reagent fully react to form hydrochloric acid which is absorbed and dissolved in water. Due to the physical property that hydrogen chloride gas is very soluble in water, the reduction in the volume of the hydrogen chloride gas in the sealed reaction pool (054) is equal to the volume of the reagent entering the reaction pool, that is, the ratio of the volume of the reagent entering the reaction pool to the volume of the sampled hydrogen chloride gas is equal to the purity of the hydrogen chloride. The pressure change caused by the reagent entering the reaction pool is transmitted to the program control and data processing end through the detection current of the pressure transmitter (091), and the volume of the reagent entering the reaction pool (054) and the purity of the hydrogen chloride are calculated. S6: The program control and data processing end analyzes and processes the received data to complete data display and self-diagnosis; the data interface of the program control and data processing end synchronously exchanges data with the factory's DCS system, and adjusts the opening size of the feed valve of the hydrogen chloride synthesis furnace in real time to keep the hydrogen chloride synthesis furnace in the best operating state.

8. The detection method according to claim 7, characterized in that: The specific process of the reagent in S3 entering the reaction pool (054) in the detection module (05) through the reagent guide component is as follows: the reagent flows through valve four (11), valve five (10), valve seven (09), pressure balance pipe one (13), valve seven (09), valve six (04) in sequence and enters the reaction pool (054) in the detection module (05).

9. The detection method according to claim 7, characterized in that: After the hydrogen chloride gas in S2 enters the reaction pool in the detection module (05), valve one (02), valve two (03) and valve three (06) are closed, and then S3 is performed to send the reagent into the reaction pool (054).

10. The detection method according to claim 7, characterized in that: Before the hydrogen chloride gas enters the reaction pool (054), the light sensor (053) and the pressure transmitter (091) transmit the detection data to the program control and data processing end and simultaneously calculate the light value and pressure value after the reaction to eliminate the zero drift.

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