A dynamically coordinated control raw gas delivery system

Abstract

The utility model discloses a raw material gas conveying system of dynamic coordination control, including raw material gas generating unit, drying and dewatering unit and booster conveying unit. Among them, booster conveying unit covers booster machine body, raw material gas pipeline, lubricating oil pipeline etc. Aiming at the problems of insufficient conveying pressure, poor temperature adaptability, low flow and pressure control precision and the production device cannot be switched flexibly of the existing chlorine gas conveying system, the system can switch raw material gas to different production devices, adapts to different reaction pressure working condition, controls flow and pressure accurately through optimization design, and has high sealing property simultaneously. The system significantly improves the high and low temperature chlorination process production level, provides demonstration for calcium carbide method production PVC enterprise structure transformation, effectively reduces the dependence of ethylene method PVC on petroleum raw material, improves coal additional value, and has important significance to promote the development of relevant industry.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to a raw material gas conveying system used in chlor-alkali chemical and high- and low-temperature chlorination processes. Background Technology

[0002] In traditional processes, chlorine and hydrogen obtained from the electrolysis of sodium chloride solution are often synthesized into hydrogen chloride in a certain proportion for the production of polyvinyl chloride (PVC) or the synthesis of hydrochloric acid. With the limitations of mercury catalyst consumption in the calcium carbide process, new processes are needed for the chlorine and hydrogen byproducts of the electrolysis of sodium chloride solution to produce caustic soda. A green process that uses coal to produce ethylene via ethanol and then PVC is coupled with the calcium carbide process. The chlorine obtained from the electrolysis of sodium chloride solution is transported to a high- and low-temperature chlorination unit. If the chlor-alkali unit produces liquid chlorine, hydrochloric acid, or in case of emergency pressure relief, it switches to the chlorination system. In the high- and low-temperature chlorination process, chlorine is a key raw material, and the stability, safety, and accuracy of its transportation play a decisive role in the efficiency of the entire chlorination reaction and the quality of the product.

[0003] However, the current chlorine delivery system has many problems: 1. The pressure of the existing delivery device cannot meet the requirements of high and low temperature chlorination conditions. In order to ensure that chlorine can be fully mixed with other raw materials and react, the raw materials usually need to maintain a high pressure, which helps to promote the reaction in a direction that is conducive to chlorination. At the same time, it can also overcome problems such as increased pipeline resistance at high temperatures and long delivery distances, and ensure that the raw materials are stably delivered to the reaction area.

[0004] 2. Poor temperature adaptability: When operating at low temperatures, chlorine is prone to liquefaction, which can lead to pipeline blockage, hindering the normal transport of chlorine and thus affecting production continuity.

[0005] 3. Insufficient accuracy in flow and pressure control: Conventional conveying systems struggle to precisely control the flow and pressure of chlorine. In the chlorination process, different reaction stages have varying requirements for chlorine flow and pressure. Excessive or insufficient flow, or unstable pressure, can lead to incomplete reactions, increased side reactions, and reduced product quality and production efficiency.

[0006] In summary, developing a feed gas delivery system that can flexibly switch feed gas to different production units to adapt to different reaction pressure conditions, precisely control flow and pressure, and has high sealing performance is of great significance for improving the production level of high and low temperature chlorination processes. It also serves as a demonstration for the structural transformation of calcium carbide-based PVC production enterprises, effectively reducing the dependence of ethylene-based PVC on petroleum as a raw material and increasing the added value of coal. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of insufficient conveying pressure, poor temperature adaptability, and insufficient flow and pressure control accuracy in the above-mentioned raw material gas conveying systems, as well as the inability to flexibly switch between various production devices. It provides a dynamic and coordinated control raw material gas conveying system that can flexibly switch raw material gas to different production devices to adapt to different reaction pressure conditions, accurately control flow and pressure, and has high sealing performance. This chlorine gas conveying system is of great significance for improving the production level of high and low temperature chlorination processes, serves as a demonstration for the structural transformation of calcium carbide-based PVC production enterprises, effectively reduces the raw material dependence of ethylene-based PVC on petroleum, and increases the added value of coal.

[0008] To achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0009] A dynamically coordinated and controlled raw gas conveying system includes a raw gas generation unit, a raw gas drying and dehydration unit, and a raw gas pressurization and conveying unit connected in sequence. The raw gas pressurization and conveying unit includes a pressurizer body, a raw gas pipeline, a lubricating oil pipeline, a cooling pipeline, and a sealing pipeline.

[0010] The compressor body includes a motor, a speed increaser, and a compression chamber connected sequentially via a drive shaft. The raw material gas pipeline includes a raw material gas inlet pipe, a return pipe, and a raw material gas outlet pipe. One end of the raw material gas inlet pipe is connected to the raw material gas drying and dehydration unit, and the other end is connected to the compression chamber via an inlet shut-off valve, a filter, a nitrogen filling pipe, an inlet regulating valve, and a water content detection pipe. After four stages of compression and cooling, it is connected to the raw material gas outlet pipe. The raw material gas outlet pipe is divided into two paths: one path is connected to the high and low temperature chlorination unit via a VCM valve, and the other path is connected to the decontamination pipe, the liquefaction pipe, and the hydrochloric acid pipe via a pressure reducing valve. A return pipe is installed between the raw material gas inlet pipe and the raw material gas outlet pipe, and the return pipe is equipped with a return valve. The lubricating oil pipeline includes an oil tank, an oil pump, an oil cooler, an oil filter, an oil temperature detector, and an oil pressure detector connected sequentially. The lubricating oil pipeline is connected to the speed increaser, the compressor front shaft, and the compressor rear shaft, and then converges and returns to the oil tank. The sealing pipeline is connected to the speed increaser, the compressor front shaft, the compressor rear shaft, and the oil tank, and then the converged pipe is connected to the decontamination pipeline.

[0011] Furthermore, the compression chamber includes a primary compression chamber, a secondary compression chamber, a tertiary compression chamber, and a quaternary compression chamber. A nitrogen filling pipe equipped with a nitrogen filling valve is connected to the raw material gas inlet pipe, and differential pressure detectors are installed before and after the filter.

[0012] Furthermore, the cooling pipeline includes a primary cooler, a secondary cooler, a tertiary cooler, a quaternary cooler, an oil cooler, a cooling water tank, a main water supply pipe, and a main water return pipe. The primary cooler, secondary cooler, tertiary cooler, quaternary cooler, and oil cooler are connected to the main water supply pipe via branch pipes. The primary cooler, secondary cooler, tertiary cooler, quaternary cooler, and oil cooler are connected to the main water return pipe via branch pipes. The main water return pipe is connected to the cooling water tank.

[0013] Furthermore, the raw gas passes sequentially through the raw gas inlet pipe through the primary compression chamber, primary outlet pipe, primary cooler, secondary compression chamber, secondary outlet pipe, secondary cooler, tertiary compression chamber, tertiary outlet pipe, tertiary cooler, quaternary compression chamber, quaternary outlet pipe, and quaternary cooler before connecting to the raw gas outlet pipe; the primary, secondary, tertiary, and quaternary outlet pipes are equipped with interstage pressure and interstage temperature detectors; a moisture content detection pipe is connected between the raw gas inlet pipe and the primary outlet pipe, and the moisture content detection pipe is equipped with a moisture content analyzer.

[0014] Furthermore, the removal pipe, the liquefaction pipe, and the hydrochloric acid removal pipe are respectively equipped with a removal valve, a liquefaction valve, and a hydrochloric acid removal valve. The raw material gas outlet pipe is equipped with an outlet flow meter and an outlet pressure meter, and the outlet pressure meter is electrically connected to the removal valve.

[0015] Furthermore, an oxidation-reduction potential detector is installed on the return water branch pipe.

[0016] The beneficial effects of this utility model are as follows: Compared with the prior art, the dynamic coordinated control raw material gas conveying system provided by this utility model solves the problems of insufficient conveying pressure, poor temperature adaptability, insufficient flow and pressure control accuracy, and inflexible switching between various production devices in the above-mentioned raw material gas conveying systems. It provides a dynamic coordinated control raw material gas conveying system that can flexibly switch raw material gas to different production devices to adapt to different reaction pressure conditions, accurately control flow and pressure, and has a high sealing performance. This chlorine gas conveying system is of great significance for improving the production level of high and low temperature chlorination processes, serves as a demonstration for the structural transformation of calcium carbide-based PVC production enterprises, effectively reduces the raw material dependence of ethylene-based PVC on petroleum, and increases the added value of coal. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the booster body structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the raw material gas pipeline of this utility model.

[0019] Figure 3 This is a schematic diagram of the lubricating oil pipeline of this utility model.

[0020] Figure 4 This is a schematic diagram of the cooling pipeline of this utility model.

[0021] Figure 5 This is a schematic diagram of the sealing pipeline of this utility model.

[0022] In the diagram: 1. Compressor body; 2. Raw material gas pipeline; 3. Lubricating oil pipeline; 4. Cooling pipeline; 5. Sealing pipeline; 101. Motor; 102. Speed ​​increaser; 103. Compression chamber; 103a. First-stage compression chamber; 104. Compressor front shaft; 105. Compressor rear shaft; 103b. Second-stage compression chamber; 103c. Third-stage compression chamber; 103d. Fourth-stage compression chamber; 201. Raw material gas inlet pipe; 202. Return pipe; 203. Raw material gas outlet pipe; 204. Inlet shut-off valve; 205. Filter; 206. Nitrogen charging pipe; 207. Inlet regulating valve; 208. Moisture content detection pipe; 209. Outlet pressure detector; 210. Outlet flow detector; 211. Return valve; 212. VCM removal valve; 213. Pressure reducing valve; 214. Hazard removal valve; 215. Liquefaction removal valve; 21 6. Hydrochloric acid drain valve; 217. Hydrochloric acid drain pipe; 218. Liquefaction drain pipe; 219. Hazardous waste removal pipe; 221. Moisture content detector; 222. Nitrogen charging valve; 223. Differential pressure detector; 224. Primary stage outlet pipe; 225. Secondary stage outlet pipe; 226. Tertiary stage outlet pipe; 227. Quaternary stage outlet pipe; 228. Interstage temperature detector; 229. Interstage pressure detector; 301. Oil tank; 302. Oil pump. 303. Oil cooler; 304. Oil filter; 305. Oil temperature detector; 306. Oil pressure detector; 401. Primary cooler; 402. Secondary cooler; 403. Tertiary cooler; 404. Quaternary cooler; 405. Cooling water tank; 406. Main water supply pipe; 407. Main water return pipe; 408. Branch water supply pipe; 409. Branch water return pipe; 410. Oxidation-reduction potential detector. Detailed Implementation

[0023] To enable those skilled in the art to more clearly and accurately understand the technical solution of this utility model, a detailed explanation is provided below using embodiments. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort. Example

[0024] Reference Figures 1-5As shown, a dynamically coordinated control raw material gas conveying system includes a raw material gas generation unit, a raw material gas drying and dehydration unit, and a raw material gas pressurization and conveying unit connected in sequence. The raw material gas pressurization and conveying unit includes a pressurizer body 1, a raw material gas pipeline 2, a lubricating oil pipeline 3, a cooling pipeline 4, and a sealing pipeline 5; the pressurizer body 1 includes a motor 101, a speed increaser 102, and a compression chamber 103 connected in sequence via a drive shaft.

[0025] The raw gas pipeline 2 includes a raw gas inlet pipe 201, a return pipe 202, and a raw gas outlet pipe 203. One end of the raw gas inlet pipe 201 is connected to the raw gas drying and dehydration unit, and the other end is connected to the compression chamber 103 after passing through an inlet shut-off valve 204, a filter 205, a nitrogen filling pipe 206, an inlet regulating valve 207, and a moisture content detection pipe 208. After four stages of compression and cooling, it is connected to the raw gas outlet pipe 203. The raw gas outlet pipe 203 is divided into two paths: one path is connected to the high and low temperature chlorination unit through a VCM valve 212, and the other path is connected to the removal... The system includes a reflux pipe 219, a liquefaction pipe 218, and a hydrochloric acid pipe 217; a return pipe 202 is provided between the raw material gas inlet pipe 201 and the raw material gas outlet pipe 203, and the return pipe 202 is equipped with a return valve 211; the lubricating oil in the oil tank 301 is pumped by the oil pump 302 and passes through the oil cooler 303, the oil filter 304, the oil temperature detector 305, and the oil pressure detector 306. The lubricating oil with qualified temperature and pressure is supplied to the speed increaser 102, the compressor front shaft 104, and the compressor rear shaft 105, and then flows back to the oil tank 301. This cycle is repeated to ensure the normal operation and oil supply of the compressor.

[0026] The sealing pipeline 5 is connected to the speed increaser 102, the compressor front shaft 104 and the compressor rear shaft 105 and the oil tank 301. The downstream pipe is connected to the decontamination pipe 219, and the oil tank maintains a slight positive pressure nitrogen gas seal.

[0027] Furthermore, the compression chamber 103 includes a primary compression chamber 103a, a secondary compression chamber 103b, a tertiary compression chamber 103c, and a quaternary compression chamber 103d. A nitrogen filling pipe 206 equipped with a nitrogen filling valve 222 is connected to the raw material gas inlet pipe 201. Differential pressure detectors 223 are installed before and after the filter.

[0028] Furthermore, the cooling pipeline 4 includes a primary cooler 401, a secondary cooler 402, a tertiary cooler 403, a quaternary cooler 404, an oil cooler 303, a cooling water pool 405, a main water supply pipe 406, and a main return water pipe 407. The primary cooler 401, secondary cooler 402, tertiary cooler 403, quaternary cooler 404, and oil cooler 303 are connected to the main water supply pipe 406 via a branch water supply pipe 408. The primary cooler 401, secondary cooler 402, tertiary cooler 403, quaternary cooler 4024, and oil cooler 303 are connected to the main return water pipe 407 via a branch return water pipe 409. The main return water pipe 407 is connected to the cooling water pool 405.

[0029] Furthermore, the raw gas passes sequentially through the raw gas inlet pipe 201, passing through the first-stage compression chamber 103a, the first-stage outlet pipe 224, the first-stage cooler 401, the second-stage compression chamber 103b, the second-stage outlet pipe 225, the second-stage cooler 402, the third-stage compression chamber 103c, the third-stage outlet pipe 226, the third-stage cooler 403, the fourth-stage compression chamber 103d, the fourth-stage outlet pipe 227, and the fourth-stage cooler 404 before connecting to the raw gas outlet pipe 203. The first-stage outlet pipe 224, the second-stage outlet pipe 225, the third-stage outlet pipe 226, and the fourth-stage outlet pipe 227 are equipped with interstage pressure detectors 229 and interstage temperature detectors 228. A moisture content detection pipe 208 is connected between the raw gas inlet pipe 201 and the first-stage outlet pipe 224, and the moisture content detection pipe 208 is equipped with a moisture content analyzer 221.

[0030] Furthermore, the removal pipe 219, the deliquescing pipe 218, and the hydrochloric acid dehydrogenation pipe 217 are respectively equipped with a removal valve 214, a deliquescing valve 215, and a hydrochloric acid dehydrogenation valve 216. The raw material gas outlet pipe 203 is equipped with an outlet flow meter 210 and an outlet pressure meter 209. The outlet pressure meter 209 is electrically connected to the removal valve 214.

[0031] Furthermore, an oxidation-reduction potential detector 410 is installed on the return water branch pipe 409. Example

[0032] Reference Figures 1-5 In this embodiment, chlorine gas is used as the raw material. The compression and cooling process is as follows: Chlorine gas first enters the primary compression chamber 103a of the compressor body 1. Within this chamber, the high-speed rotation of the impeller causes the gas to be subjected to centrifugal force, increasing its pressure. Simultaneously, the heat generated by compression increases its temperature. The chlorine gas exiting the primary compression chamber 103a undergoes four stages of compression and four stages of cooling, gradually increasing its pressure to meet the pressure requirements of subsequent processes. Each stage of compression is followed by a cooler that exchanges heat with the chlorine gas, rapidly cooling the gas and ensuring its temperature remains within the 25-40°C range.

[0033] Outlet Diversion Process: After four stages of compression and cooling, chlorine gas reaching the target pressure (>500 kPa) and temperature (25-40℃) flows out of the compressor outlet and is divided into two paths. One path is sent to the high and low temperature chlorination unit via VCM valve 212, serving as an important raw material for VCM production and participating in the chemical reaction to produce vinyl chloride. The other path, through a pressure reducing valve, adjusts the chlorine pressure to a suitable level (80-120 kPa) for different downstream processes. The depressurized chlorine gas then flows in three directions: first, it enters the chlorination unit absorption and treatment system to ensure system pressure relief during start-up, shutdown, and abnormal operating conditions, where it undergoes harmless treatment to eliminate potential hazards to the environment and subsequent processes; second, it enters the liquefaction unit where, through cooling, pressurization, and other liquefaction processes, the gaseous chlorine is converted into liquid, liquefying and storing excess chlorine from chlor-alkali production and depressurization to balance production and prevent environmental pollution. The stored liquid chlorine is then sent for further processing, such as use in the CPVC process. Third, it enters the hydrochloric acid production system and reacts with raw materials such as hydrogen under specific conditions to produce hydrochloric acid products required by industry, such as industrial acid and high-purity hydrochloric acid.

[0034] Based on the different flow directions mentioned above, and under the deep coupling of coal chemical and chlor-alkali chemical processes, the compressor body 1 outlet pipe is precisely controlled according to the needs and process characteristics of different users.

[0035] The opening and closing degree and flow rate of the VCM valve 212, pressure reducing valve 213, hazard removal valve 214, liquefaction valve 215 and hydrochloric acid valve 216 are adjusted to achieve a reasonable distribution of chlorine gas.

[0036] When the demand for chlor-alkali chemical products increases, pressure reducing valve 213 can be adjusted to appropriately increase the flow rate of chlorine in the chlorine removal unit, liquefaction unit, or for hydrochloric acid production, so as to ensure the raw material demand for chlor-alkali chemical production and at the same time ensure the stability of the output of chlor-alkali chemical products (such as VCM, hydrochloric acid, etc.).

[0037] If the demand for high and low temperature chlorination units increases, the flow rate of chlorine gas directly supplied to the high and low temperature chlorination units can be prioritized by adjusting the VCM valve 212. At the same time, the chlorine gas distribution ratio of the pressure reducing and diversion pipeline can be finely adjusted according to the overall production balance, so that the coal chemical and chlor-alkali chemical processes can work closely together to achieve efficient resource utilization and coordinated production, thereby improving the economic benefits and production efficiency of the entire coupled system.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dynamically coordinated and controlled raw gas conveying system, comprising a raw gas generation unit, a raw gas drying and dehydration unit, and a raw gas pressurization and conveying unit connected in sequence, characterized in that: The raw material gas booster and conveying unit includes a booster body, raw material gas pipelines, lubricating oil pipelines, cooling pipelines, and sealing pipelines; The booster compressor body includes a motor, a speed increaser, and a compression chamber connected sequentially via a drive shaft; The raw gas pipeline includes a raw gas inlet pipe, a reflux pipe, and a raw gas outlet pipe. One end of the raw gas inlet pipe is connected to the raw gas drying and dehydration unit, and the other end is connected to the compression chamber after passing through an inlet shut-off valve, a filter, a nitrogen filling pipe, an inlet regulating valve, and a moisture content detection pipe. After four-stage compression and cooling, it is connected to the raw gas outlet pipe. The raw gas outlet pipe is divided into two paths: one path is connected to the high and low temperature chlorination unit through a VCM valve, and the other path is connected to the harm removal pipe, the liquefaction pipe, and the hydrochloric acid pipe through a pressure reducing valve. A reflux pipe is installed between the raw gas inlet pipe and the raw gas outlet pipe, and the reflux pipe is equipped with a reflux valve. The lubricating oil pipeline includes an oil tank, an oil pump, an oil cooler, an oil filter, an oil temperature detector, and an oil pressure detector connected in sequence. The lubricating oil pipeline is connected to the speed increaser, the front shaft of the compressor, and the rear shaft of the compressor, and then flows back to the oil tank. The sealed piping connects to the speed increaser, the front shaft of the compressor, the rear shaft of the compressor, and the oil tank, and the manifold connects to the hazard removal line.

2. The raw gas conveying system with dynamic coordinated control according to claim 1, characterized in that, The compression chamber includes a primary compression chamber, a secondary compression chamber, a tertiary compression chamber, and a quaternary compression chamber. A nitrogen filling pipe equipped with a nitrogen filling valve is connected to the raw material gas inlet pipe, and differential pressure detectors are installed before and after the filter.

3. The raw gas conveying system with dynamic coordinated control according to claim 1, characterized in that, The cooling pipeline includes a primary cooler, a secondary cooler, a tertiary cooler, a quaternary cooler, an oil cooler, a cooling water tank, a main water supply pipe, and a main water return pipe. The primary cooler, secondary cooler, tertiary cooler, quaternary cooler, and oil cooler are connected to the main water supply pipe via branch pipes. The primary cooler, secondary cooler, tertiary cooler, quaternary cooler, and oil cooler are connected to the main water return pipe via branch pipes. The main water return pipe is connected to the cooling water tank.

4. The raw gas conveying system with dynamic coordinated control according to claim 1, characterized in that, The raw gas passes sequentially through the raw gas inlet pipe, including the first-stage compression chamber, the first-stage outlet pipe, the first-stage cooler, the second-stage compression chamber, the second-stage outlet pipe, the second-stage cooler, the third-stage compression chamber, the third-stage outlet pipe, the third-stage cooler, the fourth-stage compression chamber, the fourth-stage outlet pipe, and the fourth-stage cooler, before connecting to the raw gas outlet pipe. The first-stage outlet pipe, the second-stage outlet pipe, the third-stage outlet pipe, and the fourth-stage outlet pipe are equipped with interstage pressure and interstage temperature detectors. A moisture content detection pipe is connected between the raw gas inlet pipe and the first-stage outlet pipe, and the moisture content detection pipe is equipped with a moisture content analyzer.

5. The raw gas conveying system with dynamic coordinated control according to claim 1, characterized in that, The removal of harmful substances, the deliquescing pipe, and the dehydrochlorination pipe are respectively equipped with a removal valve, a deliquescing valve, and a dehydrochlorination valve. The raw material gas outlet pipe is equipped with an outlet flow meter and an outlet pressure meter, and the outlet pressure meter is electrically connected to the removal valve.

6. The raw gas conveying system with dynamic coordinated control according to claim 1, characterized in that, An oxidation-reduction potential detector is installed on the return water branch pipe.

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