Gas displacement device for hydrogen chloride synthesis furnace ignition
By designing a gas replacement device for the ignition of the hydrogen chloride synthesis furnace and utilizing safety measures such as nitrogen purging and flame arresters, the risk of hydrogen leakage during the ignition of the hydrogen chloride synthesis furnace was resolved, and a safe and reliable ignition process was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 新疆圣雄氯碱有限公司
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-07
AI Technical Summary
The rate of flash explosion accidents caused by hydrogen leakage during the ignition of hydrogen chloride synthesis furnace is high, and existing technologies are unable to effectively solve this problem.
A gas replacement device for ignition of a hydrogen chloride synthesis furnace was designed. It replaces residual hydrogen in the hydrogen input pipeline and furnace by purging with nitrogen, and installs flame arresters and bypass pipelines in key parts to ensure safe hydrogen input.
It effectively reduces the risk of hydrogen leakage during the ignition of the hydrogen chloride synthesis furnace, and improves the ignition success rate and safety.
Smart Images
Figure CN224470273U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flammable and explosive gas replacement technology, and is a gas replacement device for igniting a hydrogen chloride synthesis furnace. Background Technology
[0002] The core reaction in the hydrogen chloride synthesis furnace is the violent chemical reaction between hydrogen and chlorine under ignition conditions, which produces hydrogen chloride gas.
[0003] Because hydrogen is a flammable and explosive medium, residual hydrogen from the previous production period remains in the furnace and hydrogen delivery pipeline before ignition of the hydrogen chloride synthesis furnace. To ensure the safety of ignition, the flow of the medium in the hydrogen delivery pipeline must be cut off first, and then the residual hydrogen in the furnace must be purged and replaced. However, due to long-term operation, the shut-off valve on the hydrogen delivery pipeline may not close tightly. Even after the hydrogen in the furnace is purged and replaced, residual hydrogen in the hydrogen delivery pipeline can still leak into the hydrogen chloride synthesis furnace through the shut-off valve. When the hydrogen chloride synthesis furnace is ignited, a combustion and explosion accident often occurs. Regardless of whether the ignition method of the hydrogen chloride synthesis furnace is automatic or manual, there is a risk of fire and explosion caused by hydrogen leakage.
[0004] In summary, the high rate of flash explosions caused by hydrogen leakage during the ignition of hydrogen chloride synthesis furnaces has become a pressing technical challenge for enterprises. Summary of the Invention
[0005] This invention provides a gas replacement device for igniting a hydrogen chloride synthesis furnace, which overcomes the shortcomings of the prior art and can effectively solve the problem of high flash explosion accident rate caused by hydrogen leakage during the ignition of existing hydrogen chloride synthesis furnaces.
[0006] The technical solution of this utility model is achieved through the following measures: a gas replacement device for igniting a hydrogen chloride synthesis furnace, comprising a hydrogen chloride synthesis furnace and an exhaust fan. An exhaust pipeline is fixedly connected to the upper part of the hydrogen chloride synthesis furnace, and an exhaust fan is fixedly installed on the exhaust pipeline. An ignition device is installed at the bottom of the hydrogen chloride synthesis furnace. A chlorine gas input pipeline is fixedly connected to the bottom inlet of the ignition device, and a chlorine gas shut-off valve is fixedly installed on the chlorine gas input pipeline. A hydrogen gas input pipeline is fixedly connected to the lower inlet of the ignition device, and a first flame arrester is fixedly installed on the hydrogen gas input pipeline. The inlet of the hydrogen gas input pipeline and the inlet of the first flame arrester are connected at... A hydrogen regulating valve, a front hydrogen shut-off valve, and a rear hydrogen shut-off valve are fixedly installed sequentially along the medium flow direction on the hydrogen input pipeline. A first nitrogen pipeline is fixedly connected to the hydrogen input pipeline between the outlet of the rear hydrogen shut-off valve and the inlet of the first flame arrester. A second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the hydrogen input pipeline between the outlet of the front hydrogen shut-off valve and the inlet of the rear hydrogen shut-off valve. A gas delivery pump is fixedly installed on the first nitrogen pipeline between the inlet of the first nitrogen pipeline and the second nitrogen pipeline. A hydrogen replacement pipeline is fixedly connected to the hydrogen input pipeline between the hydrogen regulating valve and the front hydrogen shut-off valve.
[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0008] A first bypass pipeline is fixedly connected between the hydrogen input pipeline at the inlet of the aforementioned hydrogen regulating valve and the hydrogen input pipeline at the inlet of the hydrogen replacement pipeline, and an ignition bypass valve is fixedly installed on the first bypass pipeline.
[0009] A second bypass line is fixedly connected between the hydrogen input line between the first nitrogen line and the inlet of the first flame arrester and the hydrogen input line between the outlet of the first flame arrester and the lower inlet of the ignition device. A second flame arrester is fixedly installed on the second bypass line, and a third flame arrester is fixedly installed on the chlorine input line.
[0010] A bypass extraction pipeline is fixedly connected to the extraction pipeline between the upper outlet of the aforementioned hydrogen chloride synthesis furnace and the extraction fan, and a bypass extraction fan is fixedly installed on the bypass extraction pipeline.
[0011] The hydrogen replacement pipeline is equipped with a hydrogen replacement valve and a flow meter in sequence along the direction of medium flow.
[0012] A first pressure gauge is fixedly installed on the hydrogen input pipeline between the second nitrogen pipeline and the rear hydrogen shut-off valve.
[0013] A second pressure gauge is fixedly installed on the hydrogen input pipeline between the outlet of the aforementioned hydrogen regulating valve and the first bypass pipeline.
[0014] A hydrogen-side nitrogen purging valve is fixedly installed on the first nitrogen pipeline between the second nitrogen pipeline and the hydrogen input pipeline.
[0015] A nitrogen differential pressure regulating valve is fixedly installed on the aforementioned second nitrogen pipeline.
[0016] The aforementioned device also includes a controller, and the first pressure gauge, the second pressure gauge, and the nitrogen differential pressure regulating valve are all electrically connected to the controller.
[0017] This utility model has a reasonable and compact structure and is easy to use. Before the hydrogen chloride synthesis furnace is ignited, it not only purges and replaces the residual hydrogen gas from the cut-off valve on the hydrogen input pipeline to the hydrogen chloride synthesis furnace, but also purges and replaces the residual hydrogen gas before the cut-off valve on the hydrogen input pipeline, providing a reliable safety guarantee for the success rate of hydrogen chloride synthesis furnace ignition. Attached Figure Description
[0018] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.
[0019] Appendix Figure 1 The codes in the diagram are as follows: 1 for hydrogen chloride synthesis furnace, 2 for exhaust fan, 3 for exhaust pipeline, 4 for ignition device, 5 for chlorine input pipeline, 6 for chlorine shut-off valve, 7 for hydrogen input pipeline, 8 for first flame arrester, 9 for hydrogen regulating valve, 10 for front hydrogen shut-off valve, 11 for rear hydrogen shut-off valve, 12 for first nitrogen pipeline, 13 for second nitrogen pipeline, 14 for gas delivery pump, 15 for hydrogen replacement pipeline, 16 for first bypass pipeline, 17 for ignition bypass valve, 18 for second bypass pipeline, 19 for second flame arrester, 20 for third flame arrester, 21 for bypass exhaust pipeline, 22 for bypass exhaust fan, 23 for hydrogen replacement valve, 24 for flow meter, 25 for first pressure gauge, 26 for second pressure gauge, 27 for hydrogen-side nitrogen charging valve, and 28 for nitrogen differential pressure regulating valve. Detailed Implementation
[0020] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.
[0021] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.
[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.
[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0024] Example 1: As shown in the attached document Figure 1As shown, the gas replacement device for igniting the hydrogen chloride synthesis furnace includes a hydrogen chloride synthesis furnace 1 and an exhaust fan 2. An exhaust pipeline 3 is fixedly connected to the upper part of the hydrogen chloride synthesis furnace 1, and the exhaust fan 2 is fixedly installed on the exhaust pipeline 3. An ignition device 4 is provided at the bottom of the hydrogen chloride synthesis furnace 1. A chlorine gas input pipeline 5 is fixedly connected to the bottom inlet of the ignition device 4, and a chlorine gas shut-off valve 6 is fixedly installed on the chlorine gas input pipeline 5. A hydrogen gas input pipeline 7 is fixedly connected to the lower inlet of the ignition device 4, and a first flame arrester 8 is fixedly installed on the hydrogen gas input pipeline 7. Along the medium flow direction, the hydrogen gas input pipeline 7 between the inlet of the hydrogen gas input pipeline 7 and the inlet of the first flame arrester 8 is sequentially fixed with... The system is equipped with a hydrogen regulating valve 9, a front hydrogen shut-off valve 10, and a rear hydrogen shut-off valve 11. A first nitrogen pipeline 12 is fixedly connected to the hydrogen input pipeline 7 between the outlet of the rear hydrogen shut-off valve 11 and the inlet of the first flame arrester 8. A second nitrogen pipeline 13 is fixedly connected between the first nitrogen pipeline 12 and the hydrogen input pipeline 7 between the outlet of the front hydrogen shut-off valve 10 and the inlet of the rear hydrogen shut-off valve 11. A gas delivery pump 14 is fixedly installed on the first nitrogen pipeline 12 between the inlet of the first nitrogen pipeline 12 and the second nitrogen pipeline 13. A hydrogen replacement pipeline 15 is fixedly connected to the hydrogen input pipeline 7 between the hydrogen regulating valve 9 and the front hydrogen shut-off valve 10.
[0025] As needed, after the last production shutdown of the hydrogen chloride synthesis furnace 1 and before the new start-up ignition, this utility model performs nitrogen purging and replacement on the hydrogen input pipeline 7 at the rear outlet of the rear hydrogen shut-off valve 11 and the residual hydrogen (and residual chlorine) in the furnace chamber of the hydrogen chloride synthesis furnace 1. It also performs nitrogen purging and replacement on the hydrogen input pipeline 7 between the hydrogen regulating valve 9 and the front inlet of the rear hydrogen shut-off valve 11, setting up dual safety protection measures for the ignition and start-up of the hydrogen chloride synthesis furnace 1, thereby improving the ignition success rate of the hydrogen chloride synthesis furnace 1.
[0026] The gas replacement device for igniting the hydrogen chloride synthesis furnace can be further optimized and / or improved according to actual needs:
[0027] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, a first bypass line 16 is fixedly connected between the hydrogen input line 7 at the inlet of the hydrogen regulating valve 9 and the hydrogen input line 7 at the inlet of the hydrogen replacement line 15. An ignition bypass valve 17 is fixedly installed on the first bypass line 16.
[0028] As required, the first bypass line 16 is a bypass line with a small diameter, resulting in a small hydrogen flow rate, which facilitates the control of the hydrogen flow. When the hydrogen chloride synthesis furnace 1 is ignited, due to the safety operation requirements of the start-up and commissioning of the hydrogen chloride synthesis furnace 1, only a small amount of hydrogen needs to enter the ignition device 4. The small amount of hydrogen can enter the ignition device 4 through the first bypass line 16 and the hydrogen input line 7 to carry out the ignition process of the hydrogen chloride synthesis furnace 1. After the hydrogen chloride synthesis furnace 1 is successfully ignited, it enters the hydrogen chloride synthesis production process. Because a large amount of hydrogen is required in the hydrogen chloride synthesis production process, the ignition bypass valve 17 is in the closed state, and the hydrogen directly enters the ignition device 4 through the hydrogen input line 7.
[0029] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, a second bypass line 18 is fixedly connected between the hydrogen input line 7 between the first nitrogen line 12 and the inlet of the first flame arrester 8 and the hydrogen input line 7 between the outlet of the first flame arrester 8 and the lower inlet of the ignition device 4. A second flame arrester 19 is fixedly installed on the second bypass line 18, and a third flame arrester 20 is fixedly installed on the chlorine input line 5.
[0030] As needed, the first flame arrester 8 and the second flame arrester 19 are connected in parallel and are safety protection devices. When the first flame arrester 8 and the second flame arrester 19 work simultaneously, they can prevent the flame from spreading from the hydrogen chloride synthesis furnace 1 to the hydrogen input pipeline 7 at the left end of the first flame arrester 8 and the second flame arrester 19, and can also prevent the flame from spreading from the hydrogen input pipeline 7 at the left end of the first flame arrester 8 and the second flame arrester 19 to the hydrogen chloride synthesis furnace 1.
[0031] The third flame arrester 20 is also a safety protection device. The third flame arrester 20 can prevent the flame from spreading from the hydrogen chloride synthesis furnace 1 to the chlorine gas input pipeline 5 at the left end of the third flame arrester 20.
[0032] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, a bypass extraction pipeline 21 is fixedly connected to the extraction pipeline 3 between the upper outlet of the hydrogen chloride synthesis furnace 1 and the extraction fan 2, and a bypass extraction fan 22 is fixedly installed on the bypass extraction pipeline 21.
[0033] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, hydrogen replacement pipeline 15 is fixedly installed with hydrogen replacement valve 23 and flow meter 24 in sequence along the medium flow direction.
[0034] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a first pressure gauge 25 is fixedly installed on the hydrogen input line 7 between the second nitrogen line 13 and the rear hydrogen shut-off valve 11.
[0035] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, a second pressure gauge 26 is fixedly installed on the hydrogen input pipeline 7 between the outlet of the hydrogen regulating valve 9 and the first bypass pipeline 16.
[0036] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, a hydrogen-side nitrogen charging valve 27 is fixedly installed on the first nitrogen pipeline 12 between the second nitrogen pipeline 13 and the hydrogen input pipeline 7.
[0037] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, a nitrogen differential pressure regulating valve 28 is fixedly installed on the second nitrogen pipeline 13.
[0038] Example 10: It differs from Examples 1 to 9 in that, as shown in the appendix... Figure 1 As shown, the device also includes a controller, and the first pressure gauge 25, the second pressure gauge 26, and the nitrogen differential pressure regulating valve 28 are all electrically connected to the controller.
[0039] As needed, the first pressure gauge 25, the second pressure gauge 26, the nitrogen differential pressure regulating valve 28, and the controller are interlocked. The controller receives the nitrogen purging pressure difference between the first pressure gauge 25 and the second pressure gauge 26 in real time. The controller controls the opening of the nitrogen differential pressure regulating valve 28 to ensure that the pressure value displayed by the first pressure gauge 25 in real time is greater than the pressure value displayed by the second pressure gauge 26 in real time, and that the pressure difference between the first pressure gauge 25 and the second pressure gauge 26 in real time is greater than 2 kPa. This ensures that before the hydrogen chloride synthesis furnace 1 is ignited, residual hydrogen in the hydrogen input pipeline 7 is prevented from mixing into the hydrogen chloride synthesis furnace 1.
[0040] Depending on the needs, the pipelines and equipment of the gas replacement unit for igniting the hydrogen chloride synthesis furnace may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The controller is a PLC controller, which is equipped with a Yokogawa CS3000 DCS control system.
[0041] The above technical features constitute various embodiments of the utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
[0042] The usage process of this utility model is as follows: First, close the front hydrogen shut-off valve 10, the rear hydrogen shut-off valve 11, the hydrogen regulating valve 9, the ignition bypass valve 17, and the chlorine shut-off valve 6. Start the exhaust fan 2. Nitrogen gas enters the hydrogen input pipeline 7 at the rear outlet of the rear hydrogen shut-off valve 11 and the hydrogen chloride synthesis furnace 1 through the first nitrogen pipeline 12. This purges and replaces the residual hydrogen gas in the hydrogen input pipeline 7 at the rear outlet of the rear hydrogen shut-off valve 11 and the hydrogen chloride synthesis furnace 1. The replacement gas is discharged into the downstream process system through the exhaust pipeline 3. Then, after the hydrogen content analysis of the gas in the hydrogen chloride synthesis furnace 1 is qualified, place the ignition rod in the ignition device 4, and open the nitrogen pressure differential regulating valve 28 and the hydrogen replacement valve. Valve 23 is activated, and gas delivery pump 14 is started. Nitrogen gas enters the hydrogen input pipeline 7 between hydrogen regulating valve 9 and post-hydrogen shut-off valve 11 through the second nitrogen pipeline 13 to purge and replace the residual hydrogen gas in the hydrogen input pipeline 7 between hydrogen regulating valve 9 and post-hydrogen shut-off valve 11. The replacement gas is discharged into the downstream process system through hydrogen replacement pipeline 15. Finally, the hydrogen-side nitrogen charging valve 27, nitrogen differential pressure regulating valve 28 and hydrogen replacement valve 23 are closed. Hydrogen gas enters the ignition device 4 through the first bypass pipeline 16 and hydrogen input pipeline 7 to ignite the ignition device 4. Chlorine gas enters the ignition device 4 through chlorine input pipeline 5. Hydrogen chloride synthesis furnace 1 then performs hydrogen chloride synthesis production.
Claims
1. A gas replacement device for igniting a hydrogen chloride synthesis furnace, characterized in that... The system includes a hydrogen chloride synthesis furnace and an exhaust fan. An exhaust pipeline is fixedly connected to the upper part of the hydrogen chloride synthesis furnace, and an exhaust fan is fixedly installed on the exhaust pipeline. An ignition device is installed at the bottom of the hydrogen chloride synthesis furnace. A chlorine gas input pipeline is fixedly connected to the bottom inlet of the ignition device, and a chlorine gas shut-off valve is fixedly installed on the chlorine gas input pipeline. A hydrogen gas input pipeline is fixedly connected to the lower inlet of the ignition device, and a first flame arrester is fixedly installed on the hydrogen gas input pipeline. Along the flow direction of the medium, sequentially fixed installations are also provided on the hydrogen input pipeline between the hydrogen input pipeline inlet and the first flame arrester inlet. It has a hydrogen regulating valve, a front hydrogen shut-off valve, and a rear hydrogen shut-off valve. A first nitrogen pipeline is fixedly connected to the hydrogen input pipeline between the outlet of the rear hydrogen shut-off valve and the inlet of the first flame arrester. A second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the hydrogen input pipeline between the outlet of the front hydrogen shut-off valve and the inlet of the rear hydrogen shut-off valve. A gas delivery pump is fixedly installed on the first nitrogen pipeline between the inlet of the first nitrogen pipeline and the second nitrogen pipeline. A hydrogen replacement pipeline is fixedly connected to the hydrogen input pipeline between the hydrogen regulating valve and the front hydrogen shut-off valve.
2. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 1, characterized in that... A first bypass line is fixedly connected between the hydrogen input line at the inlet of the hydrogen regulating valve and the hydrogen input line at the inlet of the hydrogen replacement line, and an ignition bypass valve is fixedly installed on the first bypass line.
3. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 1 or 2, characterized in that... A second bypass line is fixedly connected between the hydrogen input line between the first nitrogen line and the inlet of the first flame arrester and the hydrogen input line between the outlet of the first flame arrester and the lower inlet of the ignition device. A second flame arrester is fixedly installed on the second bypass line, and a third flame arrester is fixedly installed on the chlorine input line.
4. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 3, characterized in that... A bypass extraction pipeline is fixedly connected to the extraction pipeline between the upper outlet of the hydrogen chloride synthesis furnace and the extraction fan, and a bypass extraction fan is fixedly installed on the bypass extraction pipeline.
5. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 1, 2, or 4, characterized in that... Hydrogen replacement pipelines are equipped with hydrogen replacement valves and flow meters in sequence along the direction of medium flow.
6. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 5, characterized in that... A first pressure gauge is fixedly installed on the hydrogen input line between the second nitrogen line and the rear hydrogen shut-off valve.
7. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 2, 4, or 6, characterized in that... A second pressure gauge is fixedly installed on the hydrogen input pipeline between the outlet of the hydrogen regulating valve and the first bypass pipeline.
8. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 7, characterized in that... A hydrogen-side nitrogen purging valve is fixedly installed on the first nitrogen pipeline between the second nitrogen pipeline and the hydrogen input pipeline.
9. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 8, characterized in that... A nitrogen differential pressure regulating valve is fixedly installed on the second nitrogen pipeline.
10. The gas replacement device for igniting a hydrogen chloride synthesis furnace according to claim 9, characterized in that... It also includes a controller, and the first pressure gauge, the second pressure gauge, and the nitrogen differential pressure regulating valve are all electrically connected to the controller.