Hydrogen heating system in chemical hydrogen chloride treatment
By installing components such as a hot water tank and a preheater in the hydrogen chloride treatment system, and using steam condensate to preheat hydrogen, the problem of icing in hydrogen transmission pipelines was solved, achieving stable system operation and efficient resource utilization, while reducing production costs and safety risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI BEIYUAN CHEM GROUP
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-28
AI Technical Summary
In low-temperature winter conditions, hydrogen delivery pipelines are prone to freezing and blockage, affecting production continuity and stability, and increasing costs and safety risks.
By installing components such as hot water tanks, preheaters, and insulation layers, the system utilizes steam condensate to preheat hydrogen, ensuring that the hydrogen maintains a high temperature during transportation and preventing pipeline icing. In summer, the steam condensate is used in demineralized water treatment plants to promote calcium ion precipitation, achieving flexible utilization of the system.
This effectively prevents hydrogen pipelines from freezing, ensuring the continuity and stability of production, reducing costs and safety risks, and broadening the application scope and economic benefits of the system.
Smart Images
Figure CN224167487U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of chlor-alkali chemical technology, and in particular to a hydrogen heating system for the chemical hydrogen chloride treatment. Background Technology
[0002] In the chlor-alkali chemical industry and related fields, the reaction of hydrogen and chlorine in a synthesis furnace to produce hydrogen chloride is a core process in the production of products such as polyvinyl chloride (PVC). In existing technologies, to ensure complete reaction of chlorine and avoid unreacted chlorine residue (due to its strong corrosiveness and toxicity), excess hydrogen is typically introduced into the synthesis furnace. The resulting hydrogen chloride gas mixes with the unreacted excess hydrogen and enters the vinyl chloride monomer (VCM) production unit for separation. The separated excess hydrogen is then circulated back to the synthesis furnace via a water seal tank to participate in the reaction again, thus achieving efficient resource utilization.
[0003] However, in low-temperature winter environments, due to the long hydrogen delivery pipeline from the VCM production unit to the water seal tank and the relatively low flow rate of unreacted excess hydrogen, when the outside temperature drops below 0°C, the moisture carried by the hydrogen in the delivery pipeline will gradually condense into ice. The accumulation of ice crystals will not only block the hydrogen delivery pipeline and reduce the flow cross-section, but also increase the hydrogen flow resistance, which will lead to local blockage in the hydrogen delivery pipeline, resulting in unstable hydrogen delivery pressure, and eventually system shutdown. This seriously affects the continuity and stability of production, and increases production costs and safety risks. Utility Model Content
[0004] This application provides a hydrogen heating system for chemical hydrogen chloride treatment, which solves the technical problems mentioned in the background art.
[0005] This application provides a hydrogen heating system for chemical hydrogen chloride treatment, including a hot water tank, a synthesis furnace, a VCM production device, a preheater, a water seal tank, and a demineralized water treatment plant. The hydrogen input end of the synthesis furnace is connected to the first output end of the water seal tank, the output end of the synthesis furnace is connected to the input end of the VCM production device, and the hydrogen output end of the VCM production device is connected to the first input end of the preheater. The first output end of the preheater is connected to the first input end of the water seal tank via a long-distance transmission pipeline, and the second output end is connected to the input end of a first venting pipeline. The first venting pipeline is used to vent hydrogen with a concentration lower than 99.8%. Steam condensate is transported to the first input end of the hot water tank, and the first output end of the hot water tank is connected to the second input end of the preheater and the input end of the demineralized water treatment plant via a hot water pump.
[0006] In one possible implementation, the hydrogen heating system in the chemical hydrogen chloride treatment further includes a gas holder; the second output end of the water seal tank is connected to the input end of the gas holder, the first output end of the gas holder is connected to the second input end of the water seal tank, and the second output end of the gas holder and the output end of the first vent pipe are both connected to the input end of the second vent pipe; the height of the second vent pipe is greater than the height of the first vent pipe.
[0007] In one possible implementation, the second output end of the hot water tank is provided with a drain valve.
[0008] In one possible implementation, the third output of the preheater is connected to the second input of the hot water tank.
[0009] In one possible implementation, the hydrogen heating system in the chemical hydrogen chloride treatment further includes a first insulation layer; the first insulation layer is disposed on the outer wall of the long-distance conveying pipeline.
[0010] In one possible implementation, the hydrogen heating system in the chemical hydrogen chloride treatment further includes a second insulation layer; the second insulation layer is disposed on the outer wall of the preheater.
[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:
[0012] The hydrogen heating system in the chemical hydrogen chloride treatment of this application embodiment includes a hot water tank, a synthesis furnace, a VCM (vinyl chloride) production unit, a preheater, a water seal tank, and a demineralized water treatment plant. In low-temperature winter conditions, steam condensate is transported to the hot water tank and then, driven by a hot water pump, delivered to the second input end of the preheater. This process ensures a continuous supply of hot water and provides a stable and sufficient heat source for the preheater. As a key device for hydrogen heating, the preheater effectively preheats the hydrogen delivered from the hydrogen output end of the VCM (vinyl chloride) production unit by receiving hot water at its second input end. The preheated hydrogen has a significantly increased temperature, enabling it to maintain a higher temperature over long distances, effectively reducing heat loss. When the heated hydrogen returns to the first input end of the water seal tank, its temperature advantage is further enhanced, ensuring stable pressure and purity of the hydrogen within the water seal tank and providing more ideal conditions for the subsequent reaction process in the synthesis furnace, thus achieving the recycling and efficient conversion of hydrogen within the system. Most importantly, preheating the hydrogen using a preheater ensures it maintains a high temperature during transport, preventing the moisture carried by the hydrogen from gradually condensing into ice in long-distance pipelines below 0°C. This fundamentally solves problems such as pipeline blockage, increased hydrogen flow resistance, unstable transport pressure, and system shutdowns caused by icing in hydrogen transport pipelines, ensuring continuous and stable production while reducing production costs and safety risks.
[0013] In the high-temperature environment of summer, the system cleverly switches its operating mode, redirecting the utilization of steam condensate to the demineralization chemical plant. Similarly, hot water is transported through a hot water tank and pump to the input end of the demineralization chemical plant. Here, the hot water acts as an auxiliary heating and reaction medium, working synergistically with specific chemicals to effectively promote the precipitation and removal of calcium ions from seawater, achieving flexible and efficient utilization of steam condensate in different seasons and application scenarios.
[0014] Therefore, the entire system of this application, through the precise coordination of its components, not only achieves the recycling of hydrogen and the effective utilization of steam condensate, but also ensures the stable operation of each stage of the system. In winter, the system effectively avoids the temperature drop problem of hydrogen during long-distance transportation, solving a series of serious consequences such as pipeline icing caused by excessively low temperatures, and reducing process instability factors caused by temperature fluctuations. In summer, the rational utilization of steam condensate further expands the application scope and economic benefits of the system. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the hydrogen heating system in the chemical hydrogen chloride treatment provided in the embodiments of this application.
[0017] Icons: 1-Hot water tank; 2-Synthesis furnace; 3-VCM production unit; 4-Preheater; 5-Water seal tank; 6-Demineralized water treatment plant; 7-Steam condensate; 8-Hot water pump; 9-Gas holder; 10-First vent pipe; 11-Second vent pipe; 12-Drain valve. Detailed Implementation
[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0019] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.
[0020] This application provides a hydrogen heating system for chemical hydrogen chloride treatment, such as... Figure 1As shown. The hydrogen heating system in this chemical hydrogen chloride treatment includes a hot water tank 1, a synthesis furnace 2, a VCM production unit 3, a preheater 4, a water seal tank 5, and a demineralized water treatment plant 6. The hydrogen input end of the synthesis furnace 2 is connected to the first output end of the water seal tank 5, the output end of the synthesis furnace 2 is connected to the input end of the VCM production unit 3, and the hydrogen output end of the VCM production unit 3 is connected to the first input end of the preheater 4. The first output end of the preheater 4 is connected to the first input end of the water seal tank 5 via a long-distance transmission pipeline, and the second output end is connected to the input end of the first vent pipe 10. The first vent pipe 10 is used to discharge hydrogen with a concentration lower than 99.8%. When the hydrogen concentration is sampled and tested to be qualified (greater than 99.8%), the valve at the first output end of the preheater 4 is opened, and qualified hydrogen is transported to the water seal tank 5. Steam condensate 7 is transported to the first input end of the hot water tank 1, and the first output end of the hot water tank 1 is connected to the second input end of the preheater 4 and the input end of the demineralized water treatment plant 6 via a hot water pump 8. A flame arrester is installed in the first vent pipe 10 to prevent hydrogen from igniting in the first vent pipe 10.
[0021] It should be noted that in low-temperature winter conditions, after the steam condensate 7 is transported to the hot water tank 1, it is driven by the hot water pump 8 to deliver hot water to the second input end of the preheater 4. This process ensures a continuous supply of hot water and provides a stable and sufficient heat source for the preheater 4. As a key device for hydrogen heating, the preheater 4 effectively preheats the hydrogen delivered from the hydrogen output end of the VCM (vinyl chloride) production unit by receiving hot water at its second input end. The temperature of the preheated hydrogen is significantly increased, thus enabling it to maintain a higher temperature in long-distance pipelines and effectively reducing heat loss. When the heated hydrogen returns to the first input end of the water seal tank 5, its temperature advantage is further utilized, ensuring not only the stable pressure and purity of the hydrogen in the water seal tank 5, but also providing more ideal conditions for the subsequent reaction process in the synthesis furnace 2, realizing the recycling and efficient conversion of hydrogen within the system. Most importantly, preheating the hydrogen in preheater 4 ensures that the hydrogen maintains a high temperature during transport, preventing the moisture carried by the hydrogen from gradually condensing into ice in long-distance pipelines below 0°C. This fundamentally solves problems such as pipeline blockage, increased hydrogen flow resistance, unstable transport pressure, and system shutdown caused by icing in hydrogen transport pipelines, ensuring the continuity and stability of production and reducing production costs and safety risks.
[0022] In the high-temperature environment of summer, the system cleverly switches its operating mode, redirecting the utilization of steam condensate 7 to the demineralization chemical treatment plant 6. Similarly, after being transported by hot water tank 1 and hot water pump 8, the hot water is delivered to the input end of the demineralization chemical treatment plant 6. Here, the hot water acts as an auxiliary heating and reaction medium, working synergistically with specific chemicals to effectively promote the precipitation and removal of calcium ions from seawater, achieving flexible and efficient utilization of steam condensate 7 in different seasons and application scenarios.
[0023] Therefore, through the precise coordination of its components, the entire system of this application not only achieves the recycling of hydrogen and the effective utilization of steam condensate 7, but also ensures the stable operation of each stage of the system. In winter, the system effectively avoids the temperature drop problem of hydrogen during long-distance transportation, solves a series of serious consequences such as pipeline icing caused by excessively low temperatures, and reduces process instability factors caused by temperature fluctuations. In summer, the rational utilization of steam condensate 7 further broadens the application scope and economic benefits of the system.
[0024] In this embodiment, the hydrogen heating system for chemical hydrogen chloride treatment also includes a gas holder 9. The second output end of the water seal tank 5 is connected to the input end of the gas holder 9, the first output end of the gas holder 9 is connected to the second input end of the water seal tank 5, and both the second output end of the gas holder 9 and the output end of the first vent pipe 10 are connected to the input end of the second vent pipe 11. The height of the second vent pipe 11 is greater than the height of the first vent pipe 10.
[0025] It should be noted that the gas holder 9, as a pressure buffer and hydrogen storage device, plays a crucial role in the system operation. It is equipped with a precise pressure monitoring and control system capable of sensing real-time changes in hydrogen pressure within the water seal tank 5. When the hydrogen pressure in the water seal tank 5 is insufficient, the system responds rapidly, and the gas holder 9 quickly releases stored hydrogen to replenish the water seal tank 5, thereby ensuring a continuous and stable hydrogen supply to the synthesis furnace 2 and preventing system shutdown due to hydrogen supply interruption. Conversely, when the amount of hydrogen in the water seal tank 5 is excessive, the system will systematically replenish the hydrogen in the water seal tank 5 into the gas holder 9 for storage, maintaining the dynamic balance of the entire hydrogen supply system.
[0026] In addition, the system is equipped with a second vent pipe 11, which is higher than the first vent pipe 10. This is because hydrogen has a low density and tends to rise in the air. Placing the second vent pipe 11 at a higher position ensures that hydrogen with a concentration below 99.8% diffuses into the atmosphere through this pipe. Since hydrogen is a flammable and explosive gas, it is highly susceptible to explosion if it accumulates at low altitudes and encounters an open flame or high temperature. Placing the second vent pipe 11 at a higher position effectively prevents hydrogen from accumulating at low altitudes, thereby greatly reducing the risk of explosion and ensuring the safe operation of the hydrogen heating system in the entire chemical hydrogen chloride treatment process.
[0027] In this embodiment, the second output end of the hot water tank 1 is provided with a drain valve 12, which can discharge the steam condensate 7 in the hot water tank 1.
[0028] In this embodiment of the application, the third output terminal of the preheater 4 is connected to the second input terminal of the hot water tank 1.
[0029] It should be noted that the preheater 4 of this application can deliver the water after heat exchange to the water heater, thereby realizing the recycling of water.
[0030] In this embodiment, the hydrogen heating system for chemical hydrogen chloride treatment also includes a first insulation layer. The first insulation layer is disposed on the outer wall of the long-distance transport pipeline.
[0031] In this embodiment, the hydrogen heating system in the chemical hydrogen chloride treatment also includes a second insulation layer. The second insulation layer is disposed on the outer wall of the preheater 4.
[0032] Specifically, in this application, the first insulation layer is made of 0.5mm galvanized iron sheet. This first insulation layer is installed on the outer wall of the long-distance transport pipeline, which can reduce the heat exchange between the long-distance transport pipeline and the external environment, thereby effectively ensuring the temperature requirements when hydrogen reaches the water seal tank 5.
[0033] The second insulation layer is made of 0.6mm galvanized iron sheet. This second insulation layer is set on the outer wall of the preheater 4, which can reduce the heat exchange between the preheater 4 and the external environment, so that the heat inside the preheater 4 can be used more effectively to heat hydrogen and maintain the stability of the operating temperature of the preheater 4.
[0034] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.
[0035] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.
Claims
1. A hydrogen heating system for chemical hydrogen chloride treatment, characterized in that, It includes a hot water tank (1), a synthesis furnace (2), a VCM production unit (3), a preheater (4), a water seal tank (5), and a demineralized water reagent plant (6); The hydrogen input end of the synthesis furnace (2) is connected to the first output end of the water seal tank (5), the output end of the synthesis furnace (2) is connected to the input end of the VCM production device (3), and the hydrogen output end of the VCM production device (3) is connected to the first input end of the preheater (4). The first output end of the preheater (4) is connected to the first input end of the water seal tank (5) through a long-distance conveying pipeline, and the second output end is connected to the input end of the first venting pipe (10); the first venting pipe (10) is used to vent hydrogen gas with a concentration lower than 99.8%; Steam condensate (7) is delivered to the first input end of the hot water tank (1), and the first output end of the hot water tank (1) is connected to the second input end of the preheater (4) and the input end of the demineralized water treatment plant (6) respectively via a hot water pump (8).
2. The hydrogen heating system for chemical hydrogen chloride treatment according to claim 1, characterized in that, It also includes gas holders (9); The second output end of the water seal tank (5) is connected to the input end of the gas holder (9), the first output end of the gas holder (9) is connected to the second input end of the water seal tank (5), and the second output end of the gas holder (9) and the output end of the first vent pipe (10) are both connected to the input end of the second vent pipe (11). The height of the second vent pipe (11) is greater than the height of the first vent pipe (10).
3. The hydrogen heating system for chemical hydrogen chloride treatment according to claim 1, characterized in that, The second output end of the hot water tank (1) is equipped with a drain valve (12).
4. The hydrogen heating system for chemical hydrogen chloride treatment according to claim 3, characterized in that, The third output terminal of the preheater (4) is connected to the second input terminal of the hot water tank (1).
5. The hydrogen heating system for chemical hydrogen chloride treatment according to claim 1, characterized in that, It also includes the first insulation layer; The first insulation layer is disposed on the outer wall of the long-distance conveying pipeline.
6. The hydrogen heating system for chemical hydrogen chloride treatment according to claim 1, characterized in that, It also includes a second insulation layer; The second insulation layer is disposed on the outer wall of the preheater (4).