A skid-mounted chlorine dioxide generation device

Abstract

The application discloses a kind of pry dress formula chlorine dioxide generation device, comprising: support platform, set in container bottom and specifically box bottom predetermined height;Multiple storage tanks, be set on support platform, multiple storage tanks are used to store acid raw material and reducing agent respectively;Primary reaction chamber and secondary reaction chamber, set on support platform, the primary reaction chamber utilizes multiple metering pumps and is connected with multiple storage tanks pipeline respectively, and / or secondary reaction chamber utilizes multiple metering pumps and is connected with multiple storage tanks pipeline respectively;Diluter, be set on support platform, one end of the diluter is connected with diluent storage tank pipeline, other end is connected with the primary reaction chamber and / or secondary reaction chamber pipeline, and the diluter is used to mix diluent with high concentration chlorine dioxide solution generated in primary reaction chamber and / or secondary reaction chamber proportionally to generate chlorine dioxide solution and discharge.The technical scheme of the application avoids the security risk problem caused by chlorine dioxide gas volatilization, ensures construction safety.

Description

Technical Field

[0001] This application relates to the field of chlorine dioxide generation technology, and more particularly to a skid-mounted chlorine dioxide generation device. Background Technology

[0002] Chlorine dioxide, as a highly efficient strong oxidant and broad-spectrum bactericide, has significant application value in unblocking and production enhancement operations in oil and gas well development. During oil and gas extraction, high molecular weight polymers (such as guar gum and polyacrylamide) in fracturing fluids easily form residual blockages in formation pores or fractures, leading to a decrease in permeability. Simultaneously, biofilms and byproducts such as hydrogen sulfide produced by downhole microbial metabolism further exacerbate formation blockage, causing a decline in oil and gas well productivity. Chlorine dioxide can effectively restore formation permeability and achieve unblocking and production enhancement by oxidizing and degrading high molecular weight polymer chains, decomposing biofilms, and inactivating microorganisms. It demonstrates significant technical advantages, especially in the development of unconventional oil and gas reservoirs such as shale gas and tight oil.

[0003] However, despite the clear application prospects of chlorine dioxide in oil and gas well unblocking operations, its industrial-scale promotion has long been constrained by technological bottlenecks. Specifically, chlorine dioxide gas is highly volatile and extremely sensitive to external conditions such as high temperature, light, and vibration. Current construction methods require the temporary preparation of chlorine dioxide solutions at the work site and storage in open or semi-closed tanks, during which chlorine dioxide gas easily escapes into the air. When the concentration of chlorine dioxide in the air exceeds a certain range (explosion limit), it may cause an explosion upon contact with an open flame or static spark. Furthermore, temperature fluctuations or mechanical vibrations during storage accelerate the decomposition of chlorine dioxide, leading to a decrease in the effective concentration of the solution and affecting the operational results. Therefore, large-scale industrial deployment of chlorine dioxide in the oil and gas well sector is difficult.

[0004] Furthermore, traditional construction methods require workers to be exposed to chlorine dioxide gas for extended periods during the preparation, storage, and pumping of chlorine dioxide solutions. Long-term inhalation of low concentrations of chlorine dioxide can cause respiratory damage, eye irritation, and nervous system impairment, while acute exposure can lead to serious health problems such as pulmonary edema. These occupational health risks further limit the routine application of chlorine dioxide in oil and gas well operations. Utility Model Content

[0005] In view of this, embodiments of this application provide a skid-mounted chlorine dioxide generating device to solve at least one technical problem.

[0006] This application discloses a skid-mounted chlorine dioxide generating device, comprising: a support platform disposed at the bottom of a container and at a predetermined height from the bottom of the container; multiple storage tanks disposed on the support platform, the multiple storage tanks being used to store acidic raw materials and reducing agents respectively; a primary reaction chamber and a secondary reaction chamber disposed on the support platform, the primary reaction chamber being connected to the multiple storage tanks via multiple metering pumps, and / or the secondary reaction chamber being connected to the multiple storage tanks via multiple metering pumps; and a diluent disposed on the support platform, one end of the diluent being connected to a diluent storage tank via a pipeline, the other end being connected to the pipelines of the primary reaction chamber and / or the secondary reaction chamber, the diluent being used to mix the diluent with the high-concentration chlorine dioxide solution generated in the primary reaction chamber and / or the secondary reaction chamber in a proportion to generate a chlorine dioxide solution and discharge it.

[0007] In the generating apparatus described above, both the primary reaction chamber and the secondary reaction chamber are sealed reaction chambers, and the sealed reaction chambers are provided with a polytetrafluoroethylene anti-corrosion coating.

[0008] As described above, the generating apparatus includes multiple staggered guide vanes in both the primary and secondary reaction chambers, which divide the internal space of the reaction chambers into S-shaped channels.

[0009] As 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 pipe of the diluent storage tank via a centrifugal pump. The second inlet end of the first Venturi jet pump is connected to the outlet pipe of the primary reaction chamber. The first inlet end of the second Venturi jet pump is connected to the outlet pipe of the first Venturi jet pump. The second inlet end of the second Venturi jet pump is connected to the outlet pipe of the secondary reaction chamber.

[0010] The generating apparatus described above further includes: a chlorine dioxide concentration detector and a controller, which are electrically connected to the controller. The chlorine dioxide concentration detector is located at the outlet of the diluent 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 rate of the reaction chamber based on the detected chlorine dioxide concentration value.

[0011] The generating apparatus as described above further includes: a pressure sensor and a controller, wherein the pressure sensor is electrically connected to the controller, and the pressure sensor is installed in the primary reaction chamber and the secondary reaction chamber to detect the pressure inside 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 a safe pressure threshold, the metering pump is controlled to stop working immediately.

[0012] The generating apparatus as 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 is unable to control the metering pump to stop working, the spring-loaded safety valve opens to quickly release pressure.

[0013] As described above, the container bottom 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. The leak-proof layer is an epoxy resin anti-corrosion coating.

[0014] The generating apparatus described above further includes: a generator and a power distribution cabinet, mounted on a support platform. The generator is electrically connected to the power distribution cabinet, and the power distribution cabinet is electrically connected to the plurality of storage tanks, metering pumps, primary reaction chamber, secondary reaction chamber, diluent, and controller to provide stable power. Both the container and the power distribution cabinet are provided with electrostatic grounding.

[0015] As described above, the storage tank includes a feed inlet with a 2-inch quick-release clamp structure, and the diluent includes a discharge outlet with a 4-inch FIG206 unibody connector.

[0016] This application discloses a skid-mounted chlorine dioxide generator specifically for oil and gas wells. It integrates a multi-stage reaction chamber, raw material storage tank, diluent, power module, data acquisition unit and automatic control system into a single skid-mounted device. This enables the chlorine dioxide production process to meet the requirements of single feeding, closed-loop reaction production, automatic protection against abnormalities and real-time monitoring of equipment parameters. It also achieves precise control of feed, reaction conditions, chlorine dioxide concentration, conveying and dispersing pressure and discharge rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments of this application will be briefly described below.

[0018] Figure 1 This is a schematic diagram of a skid-mounted chlorine dioxide generating device according to an embodiment of this application.

[0019] Figure 2A This is a schematic diagram of a reaction chamber structure according to an embodiment of this application.

[0020] Figure 2B This is a schematic diagram of a reaction chamber structure according to another embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the construction operation of a chlorine dioxide generating device according to an embodiment of this application. Detailed Implementation

[0022] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0024] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0026] Figure 1 This is a schematic diagram of a skid-mounted chlorine dioxide generating device according to an embodiment of this application. Figure 1As shown, the chlorine dioxide generating device 100 includes: a support platform 110 and a raw material silo 120, a reaction chamber 130, a control chamber 140 and a power chamber 150 disposed on the support platform 110. The power chamber 150 is disposed on the left side of the support platform, the reaction chamber 130 and the control chamber 140 are disposed in the middle of the support platform, and the raw material silo 120 is disposed on the right side of the support platform.

[0027] A support platform 110 is installed at the bottom of the container at a predetermined height. The support platform 110 can be a welded H-beam frame structure, with a surface covered in 304 stainless steel panels. It is rigidly connected to the container floor via anchor bolts. The platform bottom is at a predetermined height from the container bottom, ranging from 100mm to 300mm. The container bottom includes a stainless steel layer and a leak-proof layer. The leak-proof layer is laid on top of the stainless steel layer and extends to the container sidewalls to the predetermined height, seamlessly joined via hot-melt welding. The leak-proof layer can be an epoxy resin anti-corrosion coating. By installing the leak-proof layer and support platform at the bottom of the container, a sealed leak-proof cavity is formed. In the event of a chlorine dioxide solution leak, the leaked liquid is temporarily stored within this cavity. Simultaneously, a level sensor in the leak-proof cavity triggers the control compartment to activate an emergency neutralization pump, transporting the leaked liquid to a neutralization tank for treatment. Through this dual mechanism of physical isolation and active protection, zero spillage of leaked liquid is achieved, significantly improving production safety.

[0028] The raw material silo 120 is equipped with multiple storage tanks for storing acidic raw materials and reducing agents. The storage tanks can be made of 316 stainless steel and are equipped with a breather valve and a feed inlet on the top. The feed inlet includes a 2-inch quick-release clamp structure, which facilitates the connection, installation and disassembly of the storage tanks with other oilfield engineering equipment on site.

[0029] like Figure 1As shown, the raw material silo 120 includes two first storage tanks 121, two second storage tanks 122, and two third storage tanks 123. The liquids contained in each tank are different; for example, the first storage tanks 121 contain sodium chlorite (NaClO2) solution, the second storage tanks 122 contain hydrochloric acid (HCl) solution, and the third storage tanks 123 contain sodium hypochlorite (NaClO) solution. There are many methods for preparing chlorine dioxide (ClO2), such as electrolysis, oxidation, reduction, organic methods, and persulfate methods. This application, considering the characteristics of oil and gas wells, preferentially uses a three-phase sodium chlorite oxidation method to prepare chlorine dioxide. Specifically, the overall efficiency of preparing chlorine dioxide solution using the ternary method can reach 80%-95%, far exceeding that of the electrolysis method, and can meet the demand of 60-150 kg / min for chlorine dioxide solution in oil and gas wells. Furthermore, the raw materials NaClO and NaClO2 have low procurement costs and do not require 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 form precipitates that could cause secondary damage to the formation.

[0030] The reaction chamber 130 includes a primary reaction chamber 131 and a secondary reaction chamber 132 connected by solenoid valve pipelines. Reaction chamber 131 is connected to multiple storage tanks via multiple metering pumps (not shown); and / or, the secondary reaction chamber is connected to multiple storage tanks via multiple metering pumps. Both the primary and secondary reaction chambers 131 and 132 are closed reaction vessels, and both are internally coated with a polytetrafluoroethylene (PTFE) anti-corrosion coating to improve their corrosion resistance. A diluent 133 is also installed within the reaction chamber 130. One end of the diluent 133 is connected to a diluent storage tank (not shown), and the other end is connected to the primary reaction chamber 131 and / or the secondary reaction chamber 132. The diluent is used to dilute the high-concentration chlorine dioxide solution generated in the primary reaction chamber 131 and / or the secondary reaction chamber 132 proportionally to obtain a chlorine dioxide solution of the desired concentration, and then discharge it.

[0031] like Figure 1As shown, the diluter 133 includes two Venturi jet pumps 1331 and 1332 connected in series. The first inlet of the first Venturi jet pump 1331 is connected to the outlet pipe of the diluent storage tank via a centrifugal pump. The second inlet of the first Venturi jet pump 1331 is connected to the outlet of the primary reaction chamber 131 via a solenoid valve (not shown). The first inlet of the second Venturi jet pump 1332 is connected to the outlet pipe of the first Venturi jet pump 1331, and the second inlet of the second Venturi jet pump 1332 is connected to the outlet of the secondary reaction chamber 132 via a solenoid valve (not shown). To meet the requirements of oil and gas wells for high concentration, high production, and high efficiency of chlorine dioxide, this application designs a multi-stage reaction chamber and multiple Venturi jet pumps, realizing various connection structures between the reaction chamber and the diluter to meet different requirements of oil and gas wells.

[0032] Example 1

[0033] According to one embodiment of this application, when the target chlorine dioxide production is lower than the production threshold, the controller opens the solenoid valve between the primary and secondary reaction chambers, connecting the primary and secondary reaction chambers in series. Chlorine dioxide is then produced jointly by the primary and secondary reaction chambers, where the production threshold is any value between 60-100 kg / min. The specific structure of the reaction chamber is as follows:

[0034] Figure 2A This is a schematic diagram of a reaction chamber structure according to an embodiment of this application. Figure 2A As shown, the solenoid valve between the first reaction chamber 131 and the second reaction chamber 132 is open; the solenoid valve between the first Venturi jet pump 1331 and the second Venturi jet pump 1332 is open; the solenoid valve between the second reaction chamber 132 and the second Venturi jet pump 1332 is open; and the solenoid valve between the first reaction chamber 131 and the first Venturi jet pump 1331 is closed. Furthermore, the metering pumps between the second storage tank 122, the third storage tank 123, and the first reaction chamber 131 are activated to inject hydrochloric acid and sodium hypochlorite solution into the first reaction chamber. The chemical formulas for the reactions are as follows:

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

[0036] After the hydrochloric acid and sodium hypochlorite react to produce an aqueous solution of chlorine gas (chlorine water), the chlorine water and the byproduct 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 then activated to inject sodium chlorite solution into the second reaction chamber. The chemical formula for the reaction is as follows:

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

[0038] After chlorine water and sodium chlorite solution react to produce chlorine dioxide, the chlorine dioxide is diluted and rapidly discharged using a second Venturi jet pump 1332. In this structure, the ternary method for preparing chlorine dioxide is divided into two steps, ensuring sufficient reaction between the raw materials. Compared to a single-stage mixed reaction, the reaction efficiency is increased by at least 10%. Furthermore, while the raw material reaction efficiency is improved, the cost of producing chlorine dioxide also decreases.

[0039] Example 2

[0040] According to one embodiment of this application, when the target chlorine dioxide production exceeds a production threshold, the controller closes the solenoid valve between the primary and secondary reaction chambers, setting the primary and secondary reaction chambers to operate in parallel, allowing each chamber to independently produce chlorine dioxide. The specific structure of the reaction chamber is as follows:

[0041] Figure 2B This is a schematic diagram of a reaction chamber structure according to another embodiment of this application. Figure 2B As shown, the solenoid valve between the first reaction chamber 131 and the second reaction chamber 132 is closed, while the solenoid valve between the first Venturi jet pump 1331 and the second Venturi jet pump 1332 is open. The solenoid valve between the first reaction chamber 131 and the first Venturi jet pump 1331 is also open, as is the solenoid valve between the second reaction chamber 132 and the second Venturi jet pump 1332. Furthermore, 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 activated preferentially. After a predetermined interval, the metering pumps between the first storage tank 121 and the first reaction chamber 131 and the second reaction chamber 132 are activated, allowing the first reaction chamber 131 and the second reaction chamber 132 to independently prepare chlorine dioxide solution. The first Venturi jet pump 1331 dilutes the chlorine dioxide in the first reaction chamber 131 with a diluent and introduces it into the second Venturi jet pump 1332. The second Venturi jet pump 1332 further dilutes the chlorine dioxide solution in the second reaction chamber 132 and rapidly discharges it. 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] In this system, 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 yield of chlorine dioxide is directly increased by 100% through the 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 prepare chlorine dioxide solutions with concentrations ranging from 200ppm to 5000ppm. Compared to a single-reaction-chamber system, the applicability of chlorine dioxide solution concentration is expanded by 60%.

[0045] The control chamber 140 is equipped with a controller 141, which is electrically connected to the storage tanks (121, 122 and 123), the metering pump, the primary reaction chamber 131, the secondary reaction chamber 132 and the diluent 133 respectively. According to the target chlorine dioxide concentration, the controller 141 controls the metering pump connected to the primary reaction chamber 131 and / or the metering pump connected to the secondary reaction chamber 132 to start, so as to transport the raw materials in the storage tank to the primary reaction chamber 131 and / or the secondary reaction chamber 132, and controls the diluent 133 to dilute and mix the chlorine dioxide with the diluent to generate a chlorine dioxide solution.

[0046] Controller 141 may 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. Controller 141 is capable of executing software or computer-readable instructions stored in memory to perform the methods or operations described herein. Controller 141 may be implemented in several different ways. For example, controller 141 may 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, controller 141 may be a PLC controller for automating the control of a chlorine dioxide generation device.

[0047] According to one embodiment of this application, the control chamber 140 is further equipped with a memory and a communication interface (not shown). The memory and the communication interface are electrically connected to the controller. The controller collects pressure data, liquid concentration data, and liquid flow data in real time and stores them in the memory for workers to review and download construction data. The data can also be sent to a cloud server via the communication interface. Furthermore, the communication interface can be used to remotely control the chlorine dioxide generating unit for production operations. The communication interface can include one or more wired or wireless communication interfaces. For example, a communication interface 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 a combination thereof.

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

[0049] The power compartment 150 is equipped with a generator 151 and a power distribution cabinet 152. The generator 151 provides the necessary electrical energy during operation and distributes the power to various components of the system through the power distribution cabinet 152. The power distribution cabinet contains a multi-channel power distribution device, which can flexibly adjust the current and voltage according to the system's needs. When the location of the chlorine dioxide generator has access to mains power, the mains power can be directly connected to the power distribution cabinet 152 to provide electrical energy, eliminating the need for a generator. However, when the oil and gas well site is in the field and mains power is unavailable, the generator is activated to provide power to the chlorine dioxide generator.

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

[0051] To prevent static electricity buildup and reduce potential safety hazards, both the container and the distribution cabinet are equipped with static grounding devices. The container is made of metal, and its bottom is connected to the ground via a grounding wire to ensure that static electricity can be effectively released during system operation. The distribution cabinet also has a dedicated grounding terminal connected to the ground to ensure that the electrical equipment inside the distribution cabinet is in a safe operating condition at all times.

[0052] Figure 3 This is a schematic diagram of the construction operation of a chlorine dioxide generating device according to an embodiment of this application.

[0053] Combination Figure 3 The construction operation steps for the chlorine dioxide generating unit are as follows:

[0054] (1) Inject the corresponding chemical raw materials into multiple storage tanks. For example... Figure 3 As shown, hydrochloric acid solution, sodium chlorite solution, and sodium hypochlorite solution are respectively poured into storage tanks. A level sensor can be installed inside the storage tank, electrically connected to the controller. When the level sensor detects that the liquid level in the storage tank has reached the upper limit, the controller stops the injection of raw materials. Similarly, when the liquid level in the storage tank is insufficient, the controller will issue a notification to add raw materials.

[0055] (2) Based on the target chlorine dioxide yield, the connection structure of the reaction chamber is adjusted, and multiple metering pumps are used to inject raw materials from multiple storage tanks into the reaction chamber. As can be seen from the above, this application includes multiple reaction chambers. For ease of description, only one 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 based on the target chlorine dioxide concentration, and then controls the metering pump to add the required chemical raw materials into the reaction chamber for mixing and reaction to generate chlorine dioxide solution. This application achieves precise control of the reaction process by accurately adding reaction raw materials through metering pumps, and strictly controls reaction parameters to ensure that each stage of reaction is thorough and complete. This application can not only stably generate chlorine dioxide solution of the preset concentration, but also effectively reduce the generation of by-products, improve reaction efficiency and product purity.

[0056] As is well known, explosions can easily occur during the preparation of chlorine dioxide, especially with high-concentration chlorine dioxide solutions. Therefore, safe production is a crucial requirement for chlorine dioxide generating equipment used in oil and gas wells. To meet explosion-proof safety requirements, this application incorporates a series of measures, as follows:

[0057] Pressure sensors are installed in the primary reaction chamber and the secondary reaction chamber respectively. The pressure sensors are electrically connected to the controller and are used to detect the internal pressure 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 safe pressure threshold, the controller controls the metering pump to stop working immediately.

[0058] Each pressure sensor can detect the pressure in its corresponding reaction chamber in real time and transmit the data to the controller. The controller has a preset safety pressure threshold parameter, set according to reaction process requirements and equipment safety standards. When the internal pressure at any point in the primary or secondary reaction chamber exceeds this safety threshold, the controller immediately determines that a safety hazard exists. Upon detecting that the pressure in the reaction chamber exceeds the safety threshold, the controller immediately sends a stop command to the metering pump. This pump stop command from the controller quickly interrupts the supply of raw materials, preventing further pressure increases and ensuring that the device automatically shuts off the reaction process in dangerous situations, achieving explosion-proof safety.

[0059] Furthermore, spring-loaded safety valves are installed in the primary and secondary reaction chambers. When the internal pressure in the primary and / or secondary reaction chambers exceeds the safety pressure threshold, and the controller is unable to stop the metering pump, the spring-loaded safety valve opens to quickly release pressure. The spring-loaded safety valve consists of a valve body, an internal spring, and control components. The spring's preset reset force matches the safety pressure threshold, ensuring that the safety valve responds 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, under normal circumstances, the controller should promptly stop the metering pump by detecting the pressure sensor signal to prevent further pressurization. However, if the controller fails to interrupt the metering pump in time due to malfunction or response delay, the excess pressure will overcome the resistance of the spring in the safety valve, causing the safety valve to open automatically. This quickly releases the excess gas to the external environment, reducing the internal pressure of the reaction chamber and preventing safety accidents caused by overpressure. Once the internal pressure returns to the safe range, the spring will automatically reset, closing the safety valve and maintaining the normal sealed state of the reaction chamber.

[0061] By introducing spring-loaded safety valves into the multi-stage reaction chambers, a multi-layered protection system is formed together with pressure sensors and controllers. This measure not only ensures precise control of reaction parameters through the controller under normal operating conditions, but also automatically activates the safety valves to release pressure in the event of control system failure or delayed response, ensuring that the entire chlorine dioxide reaction process remains in a safe and stable state.

[0062] Meanwhile, this device also employs stringent explosion-proof measures for its electrical equipment to ensure the safe and stable operation of the entire system in high-risk environments. Specifically, all electrical connections use aviation plugs, effectively preventing poor contact or sparks generated during insertion and removal; simultaneously, all cables and wires are covered with high-quality rubber, achieving an EX-level explosion-proof rating. Furthermore, critical electrical components (such as generators, control cabinets, controllers, and reaction chambers) are housed within explosion-proof enclosures and have undergone rigorous explosion-proof certification, thus preventing explosions caused by electrical sparks or localized overheating in abnormal situations. These measures collectively constitute a comprehensive explosion-proof protection system, providing a robust safety guarantee for the chlorine dioxide reactor.

[0063] (3) Multiple raw materials are mixed and reacted in the reaction chamber to produce chlorine dioxide. Both the primary and secondary reaction chambers include multiple staggered baffles that divide 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, which helps 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 discharges it into the supply truck. The first inlet end of the Venturi jet pump is connected to the dilution tank via a centrifugal pump, and the outlet end of the reaction chamber is connected to the second inlet end of the Venturi jet pump via a pipeline. The diluent output by the centrifugal pump passes through the constriction section of the Venturi jet pump at high speed, forming a low-pressure zone at the throat of the Venturi jet pump to draw in chlorine dioxide. The diluent and chlorine dioxide mix in the diffusion section of the Venturi jet pump and are discharged at high speed.

[0065] In this embodiment, the Venturi jet pump plays a crucial role as the core component for mixing and transporting chlorine dioxide and the diluent. Specifically, the first inlet of the Venturi jet pump is connected to the dilution tank via a centrifugal pump; the centrifugal pump delivers the diluent (water) at high speed to the converging section of the jet pump. In this converging section, due to the sharp reduction in cross-sectional area, the flow rate of the diluent increases significantly, thus creating a low-pressure zone at the throat of the jet pump. The presence of this low-pressure zone allows chlorine dioxide from the reaction chamber to be rapidly drawn into the jet pump. Subsequently, the drawn-in chlorine dioxide and the high-speed flowing diluent are thoroughly mixed in the diffusion section and discharged at high speed to the supply vehicle. This design fully utilizes the Venturi effect to achieve efficient mixing and rapid transport of chlorine dioxide and the diluent, thereby improving mass transfer efficiency and the overall stability and safety of the reaction process.

[0066] To ensure efficient docking between the Venturi jet pump and the supply truck, the pump's outlet is designed with a 4-inch FIG206 union connector. This connector adopts an internationally standardized design, ensuring a quick, secure, and sealed connection between the outlet and the supply truck interface, significantly reducing the risk of liquid leakage during connection. Furthermore, the 4-inch FIG206 union connector offers excellent pressure resistance and corrosion resistance, facilitating on-site installation and disassembly, and simplifying maintenance and replacement procedures.

[0067] To control the concentration of diluted chlorine dioxide, a chlorine dioxide concentration detector is installed at the outlet of the diluent. Electrically connected to the controller, it detects the concentration of the diluted chlorine dioxide solution. Based on the detected concentration, the controller adjusts the concentration of the chlorine dioxide solution by adjusting the flow rate of the diluent or the feed rate into the reaction chamber. Specifically, when the concentration data output by the chlorine dioxide concentration detector deviates from the preset target concentration, the controller makes adjustments accordingly: firstly, by adjusting the flow rate of the diluent (via a centrifugal pump) to change the mixing ratio of chlorine dioxide and the diluent; secondly, by adjusting the feed rate into the reaction chamber (via a metering pump) to control the chlorine dioxide generation rate. This achieves real-time closed-loop feedback control, ensuring that the concentration of the chlorine dioxide solution is always maintained within a safe range that meets process requirements, thereby improving product quality and the stability and safety of the production process.

[0068] (5) Water and other agents are transported to the fluid supply truck for mixing. The mixed solution is then pressurized and transported to the fracturing truck group, and then to the oil and gas well. The prepared chlorine dioxide solution is injected into the oil and gas well. The strong oxidizing properties of chlorine dioxide decompose the organic matter in the oil and gas well and eliminate blockages. In addition, the bactericidal properties of chlorine dioxide can effectively inhibit bacterial growth and prevent biological blockages.

[0069] In summary, this application discloses a skid-mounted chlorine dioxide generator specifically designed for oil and gas wells. It integrates a multi-stage reaction chamber, raw material storage tank, diluent, power module, data acquisition unit, and automatic control system into a single skid-mounted device. This allows the chlorine dioxide production process to meet the requirements of single-feeding, closed-loop reaction production, automatic anomaly protection, and real-time monitoring of equipment parameters. It achieves precise control over feed, reaction conditions, chlorine dioxide concentration, delivery and dispersion pressure, and discharge rate. This ensures the entire chlorine dioxide solution generation process takes place within a closed system. Based on construction needs, the solution is generated online and injected into the well formation in real-time using a high-pressure pump, preventing the chlorine dioxide solution from being exposed to the air and avoiding safety hazards caused by chlorine dioxide gas volatilization, thus ensuring construction safety.

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

[0071] The functional blocks shown in the structural block diagrams of this application can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc.; when implemented in software, they are programs or code segments used to perform the required tasks. Programs or code segments can be stored in memory or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. Code segments can be downloaded via computer networks such as the Internet or intranets.

[0072] It should be noted that this application is not limited to the specific configurations and processes described above or shown in the figures. The above descriptions are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the described systems, devices, modules, or units can be referred to the corresponding processes in the method embodiments, and need not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A skid-mounted chlorine dioxide generating device, characterized in that, include: A support platform is installed at the bottom of the container and at a predetermined height from the bottom of the container. Multiple storage tanks are mounted on a support platform, and the multiple storage tanks are used to store acidic raw materials and reducing agents respectively; A primary reaction chamber and a secondary reaction chamber are set on a support platform. The primary reaction chamber is connected to multiple storage tanks via multiple metering pumps, and / or the secondary reaction chamber is connected to multiple storage tanks via multiple metering pumps. A diluter is installed on a support platform. One end of the diluter is connected to a pipeline of a diluent storage tank, and the other end is connected to a pipeline of the primary reaction chamber and / or the secondary reaction chamber. The diluter is used to mix the diluent with the high-concentration chlorine dioxide solution generated in the primary reaction chamber and / or the secondary reaction chamber in a certain proportion to generate a chlorine dioxide solution and then discharge it.

2. The generating apparatus according to claim 1, characterized in that, Both the primary and secondary reaction chambers are sealed reaction chambers, and the sealed reaction chambers are equipped with a polytetrafluoroethylene anti-corrosion coating.

3. The generating apparatus according to claim 1, characterized in that, Both the primary and secondary reaction chambers include multiple staggered baffles that divide the internal space of the reaction chambers into S-shaped channels.

4. The generating apparatus according to claim 1, characterized in that, 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 pipe of the diluent storage tank via a centrifugal pump. The second inlet end of the first Venturi jet pump is connected to the outlet pipe of the primary reaction chamber. The first inlet end of the second Venturi jet pump is connected to the outlet pipe of the first Venturi jet pump. The second inlet end of the second Venturi jet pump is connected to the outlet pipe of the secondary reaction chamber.

5. The generating apparatus according to claim 1, characterized in that, Further includes: A chlorine dioxide concentration detector and a controller are provided, with the detector electrically connected to the controller. The chlorine dioxide concentration detector is located at the outlet of the diluent and is used to detect the concentration 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 rate of the reaction chamber based on the detected chlorine dioxide concentration.

6. The generating apparatus according to claim 1, characterized in that, Further includes: A pressure sensor and a controller are provided. The pressure sensor is electrically connected to the controller. The pressure sensor is installed in the primary reaction chamber and the secondary reaction chamber to detect the pressure inside 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 safe pressure threshold, the metering pump is controlled to stop working immediately.

7. The generating apparatus according to claim 6, characterized in that, Further includes: A spring-loaded safety valve is installed on the primary and secondary reaction chambers. When the internal pressure value of the primary and / or secondary reaction chambers exceeds the safety pressure threshold and the controller cannot control the metering pump to stop working, the spring-loaded safety valve opens to quickly release pressure.

8. The generating apparatus according to claim 1, characterized in that, 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. The leak-proof layer is an epoxy resin anti-corrosion coating.

9. The generating apparatus according to claim 1, characterized in that, Further includes: A generator and a power distribution cabinet are mounted on a support platform. The generator is electrically connected to the power distribution cabinet, and the power distribution cabinet is electrically connected to the plurality of storage tanks, metering pumps, primary reaction chamber, secondary reaction chamber, diluent, and controller to provide stable power. Both the container and the power distribution cabinet are equipped with electrostatic grounding.

10. The generating apparatus according to claim 1, characterized in that, The storage tank includes a feed inlet with a 2-inch quick-release clamp structure, and the diluent includes a discharge outlet with a 4-inch FIG206 unibody connector.

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