Chlorine dioxide generation device

Abstract

The invention discloses a chlorine dioxide generating device, which comprises a plurality of storage tanks, a plurality of gas-liquid separation devices, a gas-liquid separation device, a gas-liquid separation device and a gas-liquid separation device, the first-stage reaction chamber is respectively connected with the plurality of storage tanks through a plurality of metering pumps by virtue of pipelines, and / or the second-stage reaction chamber is respectively connected with the plurality of storage tanks through a plurality of metering pumps by virtue of pipelines; the diluter is used for diluting a diluent and a high-concentration chlorine dioxide solution generated in the first-stage reaction chamber and / or the second-stage reaction chamber in proportion to generate a chlorine dioxide solution; the controller is electrically connected with the first-stage reaction chamber and / or the second-stage reaction chamber, the controller controls the metering pump connected with the first-stage reaction chamber and / or the metering pump connected with the second-stage reaction chamber to be started according to the target chlorine dioxide yield, and the raw materials in the storage tank are conveyed into the first-stage reaction chamber and / or the second-stage reaction chamber to generate chlorine dioxide. And controlling the diluter to dilute and mix the chlorine dioxide and the diluent to generate a chlorine dioxide solution. The multi-stage reaction chambers are designed, so that the controller can switch the connection modes according to the target yield, the requirement of high-efficiency production can be met, and the requirement of high yield can also be met.

Description

Technical Field

[0001] This application relates to the technical field of chlorine dioxide preparation, and particularly to a chlorine dioxide generation device. Background Art

[0002] In the process of oil and gas well development, formation plugging leading to productivity decline has become a key problem restricting efficient oil and gas exploitation. Chlorine dioxide, with its strong oxidizing property and broad-spectrum bactericidal characteristics, plays an irreplaceable role in plugging removal and production enhancement operations. It can effectively oxidize and degrade the high-molecular polymers in fracturing fluids, decompose the biofilms produced by underground microbial metabolism, inactivate relevant microorganisms, and thus significantly improve the formation permeability, especially showing outstanding advantages in the development of unconventional oil and gas reservoirs such as shale gas and tight oil.

[0003] However, there are obvious technical drawbacks in the current application of chlorine dioxide in the field of oil and gas wells. In terms of preparation, existing technologies mostly adopt the method of on-site temporary preparation of chlorine dioxide solution. This method relies on small reaction equipment and manual operation, and has problems such as low preparation efficiency, low output, and low concentration. Due to the small scale of the equipment and low automation level, the single preparation process takes a long time, and it is difficult to produce a sufficient amount of chlorine dioxide in a short time, unable to meet the large demand for chlorine dioxide in the process of oil and gas well development; at the same time, limited by reaction conditions and operation accuracy, the concentration of the prepared chlorine dioxide solution is unstable and generally low, making it difficult to reach the concentration standard required for efficient plugging removal and production enhancement, resulting in limited supply quantity and quality of chlorine dioxide, and it is difficult to support large-scale operations. Summary of the Invention

[0004] In view of this, an embodiment of this application provides a chlorine dioxide generation device to solve at least one technical problem.

[0005] This application discloses a chlorine dioxide generation device, including: a plurality of storage tanks respectively used for storing acidic raw materials and reducing agents; a primary reaction chamber and a secondary reaction chamber, the primary reaction chamber is connected to the plurality of storage tanks through a plurality of metering pumps respectively, and / or the secondary reaction chamber is connected to the plurality of storage tanks through a plurality of metering pumps respectively; a diluter, one end of the diluter is connected to a dilution liquid storage tank through a pipeline, and the other end is connected to the primary reaction chamber and / or the secondary reaction chamber through a pipeline, and the diluter is used for diluting the dilution liquid and the high-concentration chlorine dioxide solution generated in the primary reaction chamber and / or the secondary reaction chamber in proportion to generate a chlorine dioxide solution; and a controller, electrically connected to the storage tank, metering pump, primary reaction chamber, secondary reaction chamber, and diluter respectively, and the controller controls the metering pump connected to the primary reaction chamber and / or the metering pump connected to the secondary reaction chamber to start according to the target chlorine dioxide output, conveys the raw materials in the storage tank to the primary reaction chamber and / or the secondary reaction chamber to generate chlorine dioxide, and controls the diluter to dilute and mix the chlorine dioxide and the dilution liquid to generate a chlorine dioxide solution with a preset concentration.

[0006] For the generating device described above, when the target chlorine dioxide production is lower than the production threshold, the controller opens the solenoid valve between the first reaction chamber and the second reaction chamber, sets the first reaction chamber and the second reaction chamber to be connected in series, and prepares chlorine dioxide jointly by the first reaction chamber and the second reaction chamber.

[0007] For the generating device described above, when the target chlorine dioxide production is higher than the production threshold, the controller closes the solenoid valve between the first reaction chamber and the second reaction chamber, sets the first reaction chamber and the second reaction chamber to be connected in parallel, and the first reaction chamber and the second reaction chamber independently prepare chlorine dioxide.

[0008] For the generating device described above, both the first reaction chamber and the second reaction chamber are enclosed reaction vessels, and a polytetrafluoroethylene anti-corrosion coating is provided inside the enclosed reaction vessels.

[0009] For the generating device described above, both the first reaction chamber and the second reaction chamber include a plurality of baffle plates arranged at intervals and staggered, dividing the internal space of the reaction chamber into an S-shaped channel.

[0010] For the generating device described above, the diluter includes: a first Venturi jet pump and a second Venturi jet pump connected in series. The first inlet end of the first Venturi jet pump is connected to the outlet pipeline of the diluent storage tank through a centrifugal pump. The second inlet end of the first Venturi jet pump is connected to the outlet pipeline of the first reaction chamber. The first inlet end of the second Venturi jet pump is connected to the outlet pipeline of the first Venturi jet pump. The second inlet end of the second Venturi jet pump is connected to the outlet pipeline of the second reaction chamber. Wherein, the diluent output by the centrifugal pump passes through the contraction section of the Venturi jet pump at a high speed, forms a low-pressure area in the throat of the Venturi jet pump to suck in chlorine dioxide, and the diluent and chlorine dioxide are mixed in the diffusion section of the Venturi jet pump and discharged at a high speed.

[0011] For the generating device described above, it further includes: a chlorine dioxide concentration detector, which is electrically connected to the controller. The chlorine dioxide concentration detector is arranged at the outlet of the diluter and is used to detect the concentration value of the chlorine dioxide solution. The controller adjusts the concentration of the chlorine dioxide solution by adjusting the flow rate of the diluent or the feed amount of the reaction chamber according to the detected chlorine dioxide concentration value.

[0012] For the generating device described above, it further includes: a pressure sensor electrically connected to the controller. The pressure sensor is respectively installed on the first reaction chamber and the second reaction chamber to detect the internal pressure of the first reaction chamber and the second reaction chamber. When the pressure value inside the first reaction chamber and / or the second reaction chamber exceeds the safety pressure threshold, the controller controls the metering pump to stop working immediately.

[0013] The generating device described above further includes: a spring-loaded safety valve installed on the primary reaction chamber and the secondary reaction chamber. When the internal pressure value of the primary reaction chamber and / or the secondary reaction chamber exceeds the safety pressure threshold and the controller fails to control the metering pump to stop working, the spring-loaded safety valve opens to rapidly relieve pressure.

[0014] The generating device described above further includes: a support platform disposed at the bottom of the container at a predetermined height from the bottom of the container body. The plurality of storage tanks, the primary reaction chamber, the secondary reaction chamber, and the diluter are disposed on the support platform. The bottom of the container includes a stainless steel layer and an anti-leakage layer. The anti-leakage layer is laid on the stainless steel layer and extends to a predetermined height on the side wall of the container. The anti-leakage layer is an epoxy resin anti-corrosion coating.

[0015] By designing multiple reaction chambers and equipped with a controller to switch its connection mode, the chlorine dioxide preparation device of the present application can meet both the requirements of high production efficiency and high production volume according to the output, expanding the applicable scenarios of the chlorine dioxide preparation device of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings in the embodiments of the present application.

[0017] Figure 1 is a schematic structural diagram of a skid-mounted chlorine dioxide generating device according to an embodiment of the present application.

[0018] Figure 2A is a schematic structural diagram of a reaction chamber according to an embodiment of the present application.

[0019] Figure 2B is a schematic structural diagram of a reaction chamber according to another embodiment of the present application.

[0020] Figure 3 is a schematic diagram of the construction operation of a chlorine dioxide generating device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the objectives, technical solutions, and advantages of the present application more clear, the following further describes the present application in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0022] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0023] It should be understood that the term "and / or" used in this text is only a relational term describing the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0024] Without departing from the spirit or scope of the present application, various modifications and changes can be made to the present application, which will be obvious to those skilled in the art. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present application can be combined with each other without conflict.

[0025] Figure 1 is a schematic structural diagram of a skid-mounted chlorine dioxide generating device according to an embodiment of the present application. As Figure 1 shown, the chlorine dioxide generating device 100 includes: a support platform 110 and a raw material bin 120, a reaction bin 130, a control bin 140 and a power bin 150 arranged on the support platform 110. Among them, the power bin 150 is arranged at the left position of the support platform, the reaction bin 130 and the control bin 140 are arranged at the middle position of the support platform, and the raw material bin 120 is arranged at the right position of the support platform.

[0026] The support platform 110 is provided at the bottom of the container and at a predetermined height from the bottom of the container body. The support platform 110 can adopt an H-shaped steel welded frame structure, and its surface can be laid with a 304 stainless steel panel, and is rigidly connected to the container bottom plate through anchor bolts. The bottom surface of the platform is at a predetermined height from the bottom of the container body, and the predetermined height is in the range of 100 mm - 300 mm. Among them, the bottom of the container includes a stainless steel layer and a leak-proof layer. The leak-proof layer is laid on the stainless steel layer and extends to the side wall of the container to a predetermined height and is seamlessly connected by hot melt welding. Among them, the leak-proof layer can be an epoxy resin anti-corrosion coating. By setting a leak-proof layer at the bottom of the container and installing a support platform, a closed leak-proof cavity is formed at the bottom of the container. When the chlorine dioxide solution leaks, the leaked liquid is temporarily stored in the leak-proof cavity. At the same time, the liquid level sensor in the leak-proof cavity triggers the control chamber to start the emergency neutralization pump, and transports the leaked liquid to the neutralization tank for treatment. Through the dual mechanisms of physical isolation and active protection, zero spillage of the leaked liquid is achieved, greatly improving the production safety.

[0027] In the raw material bin 120, there are multiple storage tanks respectively used for storing acidic raw materials and reducing agents. The material of the storage tanks can be 316 stainless steel. A breathing valve and a feed inlet are provided at the top. The feed inlet includes a 2-inch quick-installing clamp structure, which is convenient for the connection, installation and disassembly of the storage tanks on-site with other oilfield engineering equipment.

[0028] As Figure 1 shown, the raw material bin 120 includes: two first storage tanks 121, two second storage tanks 122 and two third storage tanks 123. The liquids contained in the three are different. For example, the first storage tank 121 is used to hold sodium chlorite (NaClO2) solution, the second storage tank 122 is used to hold hydrochloric acid (HCl) solution, and the third storage tank 123 is used to hold sodium hypochlorite (NaClO) solution. There are many methods for preparing chlorine dioxide (ClO2), such as electrolysis method, oxidation method, reduction method, organic matter method, persulfate method, etc. In this application, combined with the characteristics of oil and gas wells, the three-phase sodium chlorite oxidation method is preferably used to prepare chlorine dioxide. Specifically, the total efficiency of preparing chlorine dioxide solution by the ternary method can reach 80% - 95%, far exceeding the electrolysis method, and can meet the demand of 60 - 150 kg / min of chlorine dioxide solution for oil and gas wells. Moreover, the procurement costs of the raw materials NaClO and NaClO2 are low, and there is no need for high-temperature decomposition equipment. The by-product NaCl solution is compatible with the formation and can be directly reinjected into the formation without reacting with certain substances in the formation to generate precipitation and cause secondary damage to the formation.

[0029] The reaction chamber 130 includes: a primary reaction chamber 131 and a secondary reaction chamber 132 connected by a solenoid valve pipeline, and the primary reaction chamber 131 is respectively connected to a plurality of storage tanks through a plurality of metering pumps (not shown); and / or, the secondary reaction chamber is respectively connected to a plurality of storage tanks through a plurality of metering pumps. Wherein, both the primary reaction chamber 131 and the secondary reaction chamber 132 are airtight reaction vessels, and a polytetrafluoroethylene anti-corrosion coating is provided inside both of them to improve the anti-corrosion performance of the vessels. A diluter 133 is also provided in the reaction chamber 130. One end of the diluter 133 is connected to a diluent storage tank (not shown) through a pipeline, and the other end is connected to the primary reaction chamber 131 and / or the secondary reaction chamber 132 through a pipeline. Wherein, the diluter is used to dilute the diluent and the high-concentration chlorine dioxide solution generated in the primary reaction chamber 131 and / or the secondary reaction chamber 132 in proportion to generate the required concentration of chlorine dioxide solution and discharge it.

[0030] As Figure 1 shown, the diluter 133 includes two mutually series-connected first Venturi jet pumps 1331 and second Venturi jet pumps 1332. The first inlet end of the first Venturi jet pump 1331 is connected to the outlet pipeline of the diluent storage tank through a centrifugal pump. The second inlet end of the first Venturi jet pump 1331 is connected to the outlet end of the primary reaction chamber 131 through a solenoid valve (not shown) pipeline. The first inlet end of the second Venturi jet pump 1332 is connected to the outlet pipeline of the first Venturi jet pump 1331. The second inlet end of the second Venturi jet pump 1332 is connected to the outlet end of the secondary reaction chamber 132 through a solenoid valve (not shown) pipeline.

[0031] In order to meet the requirements of oil and gas wells for high concentration, high output and high efficiency of chlorine dioxide, the present application realizes various connection structures between the reaction chamber and the diluter by designing the structure of multiple reaction chambers and multiple Venturi jet pumps to meet different requirements of oil and gas wells:

[0032] Embodiment 1

[0033] According to an embodiment of the present application, when the target chlorine dioxide output is lower than the output threshold, the controller opens the solenoid valve between the primary reaction chamber and the secondary reaction chamber, sets the primary reaction chamber and the secondary reaction chamber to be connected in series, and prepares chlorine dioxide jointly by the primary reaction chamber and the secondary reaction chamber, where the output threshold is any value in the range of 60 - 100 kg / min. The specific structure of the reaction chamber is as follows:

[0034] Figure 2A is a schematic structural diagram of a reaction chamber according to an embodiment of the present application. As Figure 2AAs shown, the solenoid valve between the first reaction chamber 131 and the second reaction chamber 132 is opened, the solenoid valve between the first Venturi jet pump 1331 and the second Venturi jet pump 1332 is opened, the solenoid valve between the second reaction chamber 132 and the second Venturi jet pump 1332 is opened, while the solenoid valve between the first reaction chamber 131 and the first Venturi jet pump 1331 is closed. Moreover, the metering pump between the second storage tank 122, the third storage tank 123 and the first reaction chamber 131 is started, and hydrochloric acid and sodium hypochlorite solution are injected into the first reaction chamber. The reaction chemical formula is as follows:

[0035] 2HCl + NaOCl → Cl2(Aq) + H2O + NaCl(1);

[0036] When the aqueous solution of chlorine gas, i.e., chlorine water, is generated by the reaction of hydrochloric acid and sodium hypochlorite, the chlorine water and the by-product sodium chloride solution flow into the secondary reaction chamber 132. The metering pump between the first storage tank 121 and the second reaction chamber 132 is started, and sodium chlorite solution is injected into the second reaction chamber. The reaction chemical formula is as follows:

[0037] Cl2(Aq) + 2NaClO2 → 2ClO2 + 2NaCl(2);

[0038] When chlorine dioxide is generated by the reaction of chlorine water and sodium chlorite solution, the second Venturi jet pump 1332 is used to dilute and quickly discharge chlorine dioxide. In the above structure, the preparation of chlorine dioxide by the three - element method is divided into two - step reactions, enabling the raw materials to react fully. Compared with the reaction efficiency of single - stage mixing reaction, it is increased by at least more than 10%. Moreover, while the reaction efficiency of the raw materials is improved, the cost of producing chlorine dioxide will also decrease accordingly.

[0039] Embodiment 2

[0040] According to an embodiment of the present application, when the target chlorine dioxide output is higher than the output threshold, the controller closes the solenoid valve between the primary reaction chamber and the secondary reaction chamber, sets the primary reaction chamber and the secondary reaction chamber in parallel, and the primary reaction chamber and the secondary reaction chamber independently prepare chlorine dioxide. The specific structure of the reaction chamber is as follows:

[0041] Figure 2B It is a schematic diagram of the reaction chamber structure according to another embodiment of the present application. As Figure 2BAs shown, the solenoid valve between the first reaction chamber 131 and the second reaction chamber 132 is closed, the solenoid valve between the first Venturi jet pump 1331 and the second Venturi jet pump 1332 is opened, the solenoid valve between the first reaction chamber 131 and the second Venturi jet pump 1332 is opened, and the solenoid valve between the second reaction chamber 132 and the second Venturi jet pump 1332 is opened. Also, the metering pumps between the second storage tank 122 and the third storage tank 123 and the first reaction chamber 131 and the second reaction chamber 132 are started preferentially. After a predetermined time interval, the metering pumps between the first storage tank 121 and the first reaction chamber 131 and the second reaction chamber 132 are started, so that the first reaction chamber 131 and the second reaction chamber 132 independently prepare chlorine dioxide solutions. The first Venturi jet pump 1331 dilutes the chlorine dioxide in the first reaction chamber 131 with a diluent and inputs it to the second Venturi jet pump 1332. The second Venturi jet pump 1332 further dilutes the chlorine dioxide in the second reaction chamber 132 with the diluted chlorine dioxide solution and quickly discharges it. Among them, the following reactions occur in both the first reaction chamber 131 and the second reaction chamber 132:

[0042] 2HCl + NaOCl → Cl2(Aq) + H2O + NaCl (1);

[0043] Cl2(Aq) + 2NaClO2 → 2ClO2 + 2NaCl (2);

[0044] Among them, the concentrations of chlorine dioxide prepared in the first reaction chamber 131 and the second reaction chamber 132 can be the same or different. When the concentrations of chlorine dioxide prepared in the first reaction chamber 131 and the second reaction chamber 132 are the same, the output of chlorine dioxide is directly increased by 100% through two sets of preparation equipment. When the concentrations of chlorine dioxide prepared in the first reaction chamber 131 and the second reaction chamber 132 are different, high-concentration and low-concentration chlorine dioxide solutions are mixed to make any chlorine dioxide solution within the concentration range of 200 ppm - 5000 ppm. Compared with the single reaction chamber system, the applicability of the chlorine dioxide solution concentration is extended by 60%.

[0045] A controller 141 is provided in the control chamber 140. The controller 141 is electrically connected to the storage tanks (121, 122, and 123), metering pumps, the first-stage reaction chamber 131, the second-stage reaction chamber 132, and the diluter 133. The controller 141 controls the metering pump connected to the first-stage reaction chamber 131 and / or the metering pump connected to the second-stage reaction chamber 132 to start according to the target chlorine dioxide concentration, conveys the raw materials in the storage tank to the first-stage reaction chamber 131 and / or the second-stage reaction chamber 132, and controls the diluter 133 to dilute and mix chlorine dioxide with the diluent to generate a chlorine dioxide solution with a preset concentration.

[0046] The controller 141 can include one or more central processing units (CPUs), graphics processing units (GPUs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or combinations thereof. The controller 141 can execute software or computer-readable instructions stored in the memory to perform the methods or operations described herein. The controller 141 can be implemented in several different ways. For example, the controller 141 can include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSMs), digital signal processors (DSPs), or combinations thereof. In one embodiment, the controller 141 can be a PLC controller to achieve the automatic control of the chlorine dioxide generation device.

[0047] According to an embodiment of the present application, a memory and a communication interface (not shown) are further provided in the control chamber 140. The memory and the communication interface are electrically connected to the controller respectively. The controller collects pressure data, liquid concentration data, liquid flow data, etc. in real time and stores them in the memory for the staff to playback and download the construction data, and can also send them to the cloud server through the communication interface. And, using the communication interface, the chlorine dioxide generation device can also be remotely controlled to perform production work. The communication interface can include one or more wired or wireless communication interfaces. For example, the communication interface is a network interface card, a wireless modem, or a wired modem. In one application, the communication interface can be a WiFi modem. In other applications, the communication interface can be a 3G modem, a 4G modem, an LTE modem, a Bluetooth component, a radio frequency receiver, an antenna, or combinations thereof.

[0048] The memory can store software, data, logs, or combinations thereof. The memory can record and store the working status and operating parameters of the chlorine dioxide generation device, and the data can be downloaded after construction. The memory can be an internal memory or an external memory. For example, the memory can be a volatile memory or a non-volatile memory, such as a non-volatile random access memory (NVRAM), a flash memory, a non-volatile memory of a disk memory, or a volatile memory such as a static random access memory (SRAM).

[0049] The power chamber 150 is provided with a generator 151 and a power distribution cabinet 152. The generator 151 provides the required electric energy during operation and distributes the power to each component in the system through the power distribution cabinet 152. The power distribution cabinet contains a multi-way power distribution device inside, which can flexibly allocate current and voltage according to the needs of the system. When the location where the chlorine dioxide generation device is located can access the commercial power, the commercial power can be directly connected to the power distribution cabinet 152 to provide electric energy without the need for the generator to generate electricity. When the oil and gas well site is in the wild and the commercial power cannot be provided, the generator is started to work to provide electric energy for the chlorine dioxide generation device.

[0050] The distribution cabinet 152 is electrically connected to multiple storage tanks (121, 122, and 123), metering pumps, a primary reaction chamber 131, a secondary reaction chamber 132, a diluter, and a controller 141 through cables, providing stable electrical energy for each component. The power management system in the distribution cabinet can monitor parameters such as current and voltage in real time, ensuring the normal operation of each device and avoiding overload or power shortage situations.

[0051] To prevent static electricity accumulation and reduce potential safety hazards, both the container and the distribution cabinet are equipped with static grounding devices. The container is made of metal material, and its bottom is connected to the ground through a grounding wire to ensure that the system can effectively release static electricity during operation. There is also a special grounding terminal inside the distribution cabinet, which is connected to the ground to ensure that the electrical equipment inside the distribution cabinet is in a safe working state at all times.

[0052] Figure 3 It is a schematic diagram of the construction operation of a chlorine dioxide generation device according to an embodiment of the present application.

[0053] Combined with Figure 3 , the construction operation steps of the chlorine dioxide generation device are as follows:

[0054] (1) Inject corresponding chemical raw materials into multiple storage tanks. As Figure 3 shown, hydrochloric acid solution, sodium chlorite solution, and sodium hypochlorite solution are respectively filled in the storage tanks. Among them, a liquid level sensor can be set inside the storage tank, which is electrically connected to the controller. When the liquid level sensor detects that the liquid in the storage tank reaches the upper liquid level limit, the controller is used to control the stop of injecting raw materials. Similarly, when the liquid in the storage tank is insufficient, a notice will be sent through the controller to add raw materials.

[0055] (2) According to the target chlorine dioxide production, adjust the connection structure of the reaction chamber, and use multiple metering pumps to inject the raw materials in multiple storage tanks into the reaction chamber respectively. As described above, the present application includes multiple reaction chambers. For the convenience of description, only a primary reaction chamber is set here. According to actual needs, multiple reaction chambers can be set here for reaction work. The controller calculates the required chemical raw materials according to the target chlorine dioxide concentration, so as to control the metering pump to add the required chemical raw materials into the reaction chamber for mixing reaction to generate chlorine dioxide solution. The present application precisely adds reaction raw materials through the metering pump, realizes precise control of the reaction process, strictly controls reaction parameters, and ensures that each stage of the reaction is sufficient and thorough. The present application can not only stably generate chlorine dioxide solution with a preset concentration, but also effectively reduce the generation of by-products, improve reaction efficiency and product purity.

[0056] As is well known, during the preparation of chlorine dioxide, especially in the case of high-concentration chlorine dioxide solution, explosion is likely to occur. Therefore, safe production is an important requirement for chlorine dioxide generating devices used in oil and gas wells. To meet the safety requirements of explosion prevention, this application has taken a series of measures as follows:

[0057] Pressure sensors are respectively installed in the primary reaction chamber and the secondary reaction chamber. The pressure sensors are electrically connected to the controller, and are used to detect the internal pressures of the primary reaction chamber and the secondary reaction chamber. When the pressure value inside the primary reaction chamber and / or the secondary reaction chamber exceeds the safety pressure threshold, the controller controls the metering pump to stop working immediately.

[0058] Each pressure sensor can detect the pressure inside the corresponding reaction chamber in real time and transmit the detected data to the controller. A safety pressure threshold parameter is preset in the controller, and this parameter is set according to the reaction process requirements and equipment safety standards. When the internal pressure at any place in the primary reaction chamber or the secondary reaction chamber exceeds this safety pressure threshold, the controller immediately determines that there is a safety hazard. In the case where it is detected that the pressure inside the reaction chamber exceeds the safety threshold, the controller immediately sends a shutdown instruction to the metering pump. Through the pump shutdown instruction issued by the controller, the supply of raw materials can be quickly interrupted, thereby preventing further pressure increase and ensuring that the device automatically cuts off the reaction process in a dangerous situation, achieving the purpose of explosion prevention and safety.

[0059] Furthermore, spring-type safety valves are installed on the primary reaction chamber and the secondary reaction chamber. When the internal pressure value of the primary reaction chamber and / or the secondary reaction chamber exceeds the safety pressure threshold and the controller fails to control the metering pump to stop working, the spring-type safety valve opens to quickly relieve pressure. The spring-type safety valve consists of a valve body, an internal spring and a control component, and the reset force preset by its spring matches the safety pressure threshold to ensure that the safety valve can respond quickly when the pressure inside the reaction chamber exceeds the set safety value.

[0060] When the pressure in the primary or secondary reaction chamber gradually increases due to the accumulation of gas generated during the reaction process and exceeds the preset safety pressure threshold, normally, the controller should detect the pressure sensor signal in time and control the metering pump to stop feeding to prevent further pressure increase. However, when the controller fails to interrupt the operation of the metering pump in time due to abnormality or response delay, the excessive pressure will overcome the resistance of the spring inside the safety valve, causing the safety valve to open automatically, thereby quickly discharging the excess gas to the external environment, reducing the internal pressure of the reaction chamber, and preventing safety accidents caused by overpressure. After the internal pressure returns to the safe range, the spring will automatically reset and close the safety valve to maintain the normal airtight state of the reaction chamber.

[0061] By introducing a spring-loaded safety valve in the multi-stage reaction chamber, a multiple protection system is jointly formed with the pressure sensor and the controller. This measure not only ensures the precise regulation of reaction parameters through the controller under normal operating conditions, but also can automatically activate the safety valve to relieve pressure in the event of system failure or untimely response of the control system, ensuring that the entire chlorine dioxide reaction process is always in a safe and stable state.

[0062] At the same time, strict explosion-proof measures are also taken for the electrical equipment of this device to ensure the safe and stable operation of the entire system in a high-risk environment. Specifically, all electrical connections use aviation plugs, which can effectively avoid poor contact or sparks generated during the plugging and unplugging process; at the same time, all cables and wires are coated with high-quality rubber, and their explosion-proof grade reaches the EX level. In addition, key electrical components are installed in explosion-proof enclosures (such as generators, control cabinets, controllers, and reaction chambers, etc.), and have passed strict explosion-proof certifications, so as to prevent explosion accidents caused by electric sparks or local overheating in the event of abnormalities. These measures jointly constitute a perfect explosion-proof protection system, providing a solid safety guarantee for the chlorine dioxide reaction device.

[0063] (3) A variety of raw materials are mixed and reacted in the reaction chamber to generate chlorine dioxide. Both the first-stage reaction chamber and the second-stage reaction chamber include multiple baffle plates arranged at intervals and staggered, dividing the internal space of the reaction chamber into S-shaped channels. By forming a tortuous flow path, the reactants flow along a longer route in the S-shaped channels, thereby prolonging the residence time of the reactants in the reaction chamber, helping to enhance the mixing degree between the reactants, making the reaction more complete, and improving the reaction efficiency.

[0064] (4) The Venturi jet pump uses clean water to dilute chlorine dioxide and quickly discharge it into the supply vehicle. The first inlet end of the Venturi jet pump is connected to the dilution tank through a centrifugal pump, and the outlet end of the reaction chamber is connected to the second inlet end of the Venturi jet pump through a pipeline. Among them, the diluted liquid output by the centrifugal pump passes through the contraction section of the Venturi jet pump at high speed, forming a low-pressure area at the throat of the Venturi jet pump to suck in chlorine dioxide, and the diluted liquid and chlorine dioxide are mixed and discharged at high speed in the diffusion section of the Venturi jet pump.

[0065] In this embodiment, the Venturi jet pump plays a key role as the core component for mixing and transporting chlorine dioxide and the diluent. Specifically, the first inlet end of the Venturi jet pump is connected to the dilution tank through a centrifugal pump; the centrifugal pump transports the diluent (clean water) to the contraction section of the jet pump at a high speed. In this contraction section, due to the sharp decrease in cross-sectional area, the flow rate of the diluent significantly increases, thereby forming a low-pressure zone in the throat of the jet pump. The emergence of this low-pressure zone causes the chlorine dioxide in the reaction chamber to be rapidly sucked into the jet pump. Subsequently, the inhaled chlorine dioxide is fully mixed with the high-speed flowing diluent in the diffusion section and discharged to the supply vehicle at a high speed. This design makes full use of the Venturi effect to achieve efficient mixing and rapid transportation of chlorine dioxide and the diluent, thereby improving the mass transfer efficiency and the overall stability and safety of the reaction process.

[0066] To achieve efficient docking between the Venturi jet pump and the supply vehicle, the discharge port of the Venturi jet pump is designed as a 4-inch FIG206 union joint. This joint adopts an international standard design to ensure a quick, stable, and sealed connection between the discharge port and the supply vehicle interface, significantly reducing the risk of liquid leakage during the connection process. In addition, the 4-inch FIG206 union joint has good pressure resistance and corrosion resistance, facilitating on-site installation and disassembly and simplifying maintenance and replacement operations.

[0067] To control the dilution concentration of chlorine dioxide, a chlorine dioxide concentration detector is provided at the outlet of the diluter. It is electrically connected to the controller and used to detect the concentration value of the diluted chlorine dioxide solution. The controller adjusts the concentration of the chlorine dioxide solution by adjusting the flow rate of the diluent or the feed rate of the reaction chamber according to the detected chlorine dioxide concentration value. Specifically, when there is a deviation between the concentration data output by the chlorine dioxide concentration detector and the preset target concentration, the controller will make adjustments according to the actual situation: on the one hand, by adjusting the flow rate of the diluent (adjusted by the centrifugal pump) to change the mixing ratio of chlorine dioxide and the diluent, and on the other hand, by adjusting the feed rate in the reaction chamber (adjusted by the metering pump) to control the generation rate of chlorine dioxide. In this way, real-time closed-loop feedback control is achieved, ensuring that the concentration of the chlorine dioxide solution is always maintained within a safe range that meets the process requirements, thereby improving the product quality and the stability and safety of the production process.

[0068] (5) Transport clean water and other chemicals into the supply vehicle for mixing, pressurize the mixed solution and transport it to the fracturing truck group, and then transport it to the oil and gas wellbore. Inject the prepared chlorine dioxide solution into the oil and gas well. Utilize the strong oxidizing property of chlorine dioxide to decompose the organic matter in the oil and gas well and eliminate blockages; in addition, the bactericidal property of chlorine dioxide can effectively inhibit the growth of bacteria and prevent biological blockages.

[0069] In summary, the chlorine dioxide preparation device of the present application is designed with multiple reaction chambers and equipped with a controller to switch its connection mode. When high-efficiency preparation is required, the controller can switch the multiple reaction chambers to a series mode to construct a multi-stage reaction system and improve the production efficiency of chlorine dioxide. If high-yield preparation is needed, the controller adjusts the reaction chambers to a parallel mode to enable multiple groups of reactions to proceed simultaneously, greatly shortening the preparation time and fully ensuring the output. The application of multiple Venturi jet pumps further enhances the mixing and transportation efficiency of the materials, enabling the reaction raw materials to quickly and evenly participate in the reaction in the reaction chamber and avoiding the problem of low production efficiency caused by material transmission lag. From both the reaction and transmission aspects, it ensures the dynamic requirements of high yield and high efficiency, fully meeting the large demand for chlorine dioxide during the oil and gas well development process.

[0070] It should be understood that each block or combination of blocks in the flowchart and / or block diagram can be implemented by computer program instructions, or by dedicated hardware that performs the specified function or action, or by a combination of dedicated hardware and computer instructions. For example, these computer program instructions can be provided to the processor of a general-purpose computer, a dedicated computer, or other programmable data processing device to form a machine such that these instructions executed via the processor enable the implementation of the specified function / action in each block or combination of blocks in the flowchart and / or block diagram. Such a processor can be a general-purpose processor, a dedicated processor, a special application processor, or a field programmable logic circuit.

[0071] The functional blocks shown in the structural block diagram of the embodiments of the present application can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, etc.; when implemented in software, it is a program or code segment used to perform the required tasks. The program or code segment can be stored in a memory or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. The code segment can be downloaded via a computer network such as the Internet or an intranet.

[0072] It should be noted that the present application is not limited to the specific configurations and processes described above or shown in the figures. The above are only specific embodiments of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the described system, device, module, or unit can refer to the corresponding processes in the method embodiments and will not be elaborated here. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application.

Claims

1. A device for generating chlorine dioxide, characterized in that, Comprising: A plurality of storage tanks, respectively used for storing acidic raw materials and reducing agents; A primary reaction chamber and a secondary reaction chamber, wherein the primary reaction chamber is connected to the plurality of storage tanks through a plurality of metering pumps respectively by pipelines, and / or the secondary reaction chamber is connected to the plurality of storage tanks through a plurality of metering pumps respectively by pipelines; A diluter, one end of the diluter is connected to a diluent storage tank through a pipeline, and the other end is connected to the primary reaction chamber and / or the secondary reaction chamber through a pipeline. The diluter is used to dilute the diluent and the high-concentration chlorine dioxide solution generated in the primary reaction chamber and / or the secondary reaction chamber in proportion to generate a chlorine dioxide solution; And A controller, which is electrically connected to the storage tank, the metering pump, the primary reaction chamber, the secondary reaction chamber and the diluter respectively. The controller controls the metering pump connected to the primary reaction chamber and / or the metering pump connected to the secondary reaction chamber to start according to the target chlorine dioxide output, and transports the raw materials in the storage tank to the primary reaction chamber and / or the secondary reaction chamber to generate chlorine dioxide, and controls the diluter to dilute and mix the chlorine dioxide with the diluent to generate a chlorine dioxide solution with a preset concentration.

2. The generating device according to claim 1, wherein When the target chlorine dioxide output is lower than the output threshold, the controller opens the solenoid valve between the primary reaction chamber and the secondary reaction chamber, sets the primary reaction chamber and the secondary reaction chamber to be connected in series, and jointly prepares chlorine dioxide by the primary reaction chamber and the secondary reaction chamber.

3. The generating device according to claim 1, wherein When the target chlorine dioxide output is higher than the output threshold, the controller closes the solenoid valve between the primary reaction chamber and the secondary reaction chamber, sets the primary reaction chamber and the secondary reaction chamber to be connected in parallel, and the primary reaction chamber and the secondary reaction chamber independently prepare chlorine dioxide.

4. The generating device according to claim 1, wherein Both the primary reaction chamber and the secondary reaction chamber are closed reaction vessels, and a polytetrafluoroethylene anti-corrosion coating is provided inside the closed reaction vessel.

5. The generating device according to claim 1, wherein Both the primary reaction chamber and the secondary reaction chamber include a plurality of baffle plates arranged at intervals and staggered, which divide the internal space of the reaction chamber into an S-shaped channel.

6. The generating device according to claim 1, wherein The diluter includes: a first Venturi jet pump and a second Venturi jet pump connected in series. The first inlet end of the first Venturi jet pump is connected to the outlet pipeline of the diluent storage tank through a centrifugal pump. The second inlet end of the first Venturi jet pump is connected to the outlet end of the primary reaction chamber through a pipeline. The first inlet end of the second Venturi jet pump is connected to the outlet pipeline of the first Venturi jet pump. The second inlet end of the second Venturi jet pump is connected to the outlet end of the secondary reaction chamber through a pipeline; wherein, the diluent output by the centrifugal pump passes through the contraction section of the Venturi jet pump at a high speed, forms a low-pressure area at the throat of the Venturi jet pump to suck in the chlorine dioxide, and the diluent and the chlorine dioxide are mixed and discharged at a high speed in the diffusion section of the Venturi jet pump.

7. The generating device according to claim 1, characterized in that, Further comprising: A chlorine dioxide concentration detector, which is electrically connected to the controller. The chlorine dioxide concentration detector is arranged at the outlet of the diluter and is used to detect the concentration value of the chlorine dioxide solution. The controller adjusts the concentration of the chlorine dioxide solution by adjusting the flow rate of the diluent or the feed amount of the reaction chamber according to the detected chlorine dioxide concentration value.

8. The generating device according to claim 1, characterized in that, Further comprising: A pressure sensor electrically connected to the controller, the pressure sensor is respectively installed on the first-stage reaction chamber and the second-stage reaction chamber to detect the pressure inside the first-stage reaction chamber and the second-stage reaction chamber. When the pressure value inside the first-stage reaction chamber and / or the second-stage reaction chamber exceeds the safety pressure threshold, the controller controls the metering pump to stop working immediately.

9. The generating device according to claim 8, wherein Further comprising: A spring-type safety valve installed on the first-stage reaction chamber and the second-stage reaction chamber. When the pressure value inside the first-stage reaction chamber and / or the second-stage reaction chamber exceeds the safety pressure threshold and the controller fails to control the metering pump to stop working, the spring-type safety valve opens to quickly relieve pressure.

10. The generating device according to claim 1, wherein Further comprising: A support platform is provided at the bottom of the container and at a predetermined height from the bottom of the container body. The plurality of storage tanks, the first-stage reaction chamber, the second-stage reaction chamber and the diluter are arranged on the support platform. The bottom of the container includes a stainless steel layer and an anti-leakage layer. The anti-leakage layer is laid on the stainless steel layer and extends to a predetermined height on the side wall of the container. The anti-leakage layer is an epoxy resin anti-corrosion coating.

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