JP5700160B2 - Hydrogen sulfide gas production plant and hydrogen sulfide gas exhaust method - Google Patents

Description

  The present invention relates to a hydrogen sulfide gas production plant and a method for exhausting hydrogen sulfide gas, and more particularly, to a hydrogen sulfide gas production plant including an exhaust facility for exhausting leaked hydrogen sulfide gas to the atmosphere or a gas treatment facility, and the hydrogen sulfide. The present invention relates to a method for exhausting hydrogen sulfide gas by a gas production plant.

  For example, in the hydrometallurgical method of nickel oxide ore, hydrogen sulfide gas is blown into the solution obtained by neutralizing the leachate of nickel oxide ore and the solution for recovering nickel from which impurities have been removed. Sulfurization treatment is performed.

  The hydrogen sulfide gas used at this time is produced by, for example, a hydrogen sulfide gas production plant that produces hydrogen sulfide. The hydrogen sulfide gas production plant includes equipment for producing hydrogen sulfide gas, equipment for cooling the generated hydrogen sulfide gas, equipment for recovering sulfur in the hydrogen sulfide gas, and the like. Such a hydrogen sulfide production plant is roughly divided into two types, one using a catalyst as shown in FIG. 3 and one not using a catalyst as shown in FIG.

  Specifically, the hydrogen sulfide gas production plant 50 shown in FIG. 3 includes a reaction facility 51 that generates hydrogen sulfide gas from supplied sulfur and hydrogen gas, a cooling facility 52 that cools the hydrogen sulfide gas, and a hydrogen sulfide gas. A cleaning facility 53 for cleaning sulfur contained therein, and a drying facility 54 for drying the hydrogen sulfide gas after cleaning to remove moisture. Further, the hydrogen sulfide gas production plant 50 includes a storage facility 55 that stores the generated hydrogen sulfide gas and a supply facility 56 that supplies the hydrogen sulfide gas as ancillary facilities.

  In the hydrogen sulfide gas production plant 50, a catalyst is used in the reactor of the reaction facility 51 for the purpose of reducing the activation energy. Further, in the hydrogen sulfide gas production plant 50, the sulfur contained in the produced hydrogen sulfide gas is removed by the cleaning equipment 53, and then the moisture is removed by the drying equipment 54, thereby preventing the equipment from being corroded by moisture.

  Further, in the hydrogen sulfide gas production plant 50, the produced hydrogen sulfide gas is boosted to a required pressure using a supply facility 56 such as a compressor, and the pressurized hydrogen sulfide gas is made from, for example, the above-described nickel oxide ore wet-made. Supplied to a plant that uses hydrogen sulfide gas in the dezincing process or sulfiding process of the smelting method

  The hydrogen sulfide gas production plant 50 is operated at a pressure of about 5 kPaG and a temperature of about 380 ° C. as conditions for producing the hydrogen sulfide gas. In the hydrogen sulfide gas production plant 50, since a catalyst is used for the reaction equipment 51, it is possible to operate under conditions where both pressure and temperature are low, which is an operational advantage.

  However, in the hydrogen sulfide gas production plant 50, in addition to the need to periodically replace the catalyst in the reaction facility 51, the quality of sulfur, which is a raw material for hydrogen sulfide gas, is strictly controlled from the viewpoint of the life of the catalyst. There is a need to.

  On the other hand, the hydrogen sulfide gas production plant 60 shown in FIG. 4 is a plant that does not use a catalyst in the reactor. As shown in FIG. 4, the hydrogen sulfide gas production plant 60 includes a reaction facility (reactor 66, quench tower 67, heater 68) 61 that generates hydrogen sulfide gas from sulfur and hydrogen gas, and cooling that cools the hydrogen sulfide gas. Facility 62 (62A, 62B), knockout facility 63 for removing sulfur in hydrogen sulfide gas and supplying hydrogen sulfide gas, and blowdown facility 64 for recovering sulfur removed from hydrogen sulfide gas and supplying it to a sulfur treatment plant or the like It consists of and. In addition, the hydrogen sulfide gas production plant 60 includes, as ancillary equipment, equipment 65 that cools the temperature of sulfur in order to adjust the heat balance.

  In the hydrogen sulfide gas production plant 60, molten sulfur is stored in the reactor 66 of the reaction facility 61, and hydrogen gas is supplied from the lower portion, so that the generation reaction of hydrogen sulfide gas proceeds while the hydrogen gas passes through the molten sulfur. To do. In addition, sulfur reduced by the reaction is supplied from the upper part of the reaction facility 61. Although most of the hydrogen sulfide gas generated in the reaction facility 61 is hydrogen sulfide, it contains sulfur vapor that is entrained when the hydrogen gas passes through the reactor.

  Further, the hydrogen sulfide gas production plant 60 is operated under conditions of high temperature and high pressure such as a pressure of about 800 kPaG and a temperature of about 470 ° C. as conditions for producing the hydrogen sulfide gas. The generated hydrogen sulfide gas is lowered to a temperature of about 150 ° C. when it exits the quench tower 67 constituting the reaction facility 61, and is further about 50 ° C. in the cooling facility 62 (used in the supply destination facility). Temperature) and transferred to the knockout facility 63.

  Further, most of the sulfur contained in the hydrogen sulfide gas generated in the reaction facility 61 is made up of valves such as control valves and manual valves in plants that use the hydrogen sulfide gas to be supplied, thermometers and pressure gauges. If it adheres to the instruments such as, it will cause a big trouble in operation. Therefore, it is solidified once in the knockout facility 63, and the sulfur deposited on the bottom thereof is melted and recovered by heating with steam through a jacket installed around the lower part of the knockout facility 63. The recovered sulfur is stored in the blow-down facility 64 and then supplied to the sulfur treatment plant using the supply pump 69 to be processed or repeatedly used.

  Thus, after the sulfur contained in the hydrogen sulfide gas produced | generated in the hydrogen sulfide gas manufacturing plant 60 was isolate | separated with the knockout drum, the hydrogen sulfide gas is the hydrometallurgy method of the nickel oxide ore mentioned above, for example Supplied to a plant that uses hydrogen sulfide gas in a dezincing process, a sulfiding process, or the like.

  Since the hydrogen sulfide gas production plant 60 is operated and managed with the pressure in the system being high, facilities such as a compressor and a chiller facility become unnecessary, and initial investment can be suppressed. Further, there is an advantage that the operation cost can be reduced because the periodic replacement of the catalyst as in the hydrogen sulfide gas production plant 50 described above, the replacement cost for the catalyst, and the maintenance cost including the quality control of sulfur are unnecessary.

  However, since the hydrogen sulfide gas production plant 60 is operated under high pressure and high temperature conditions, the risk of gas leakage increases.

  Since hydrogen sulfide gas is a very dangerous substance, it is necessary to take countermeasures against gas leakage. For example, it is necessary to surround the hydrogen sulfide gas production facility with a building, a shelter, or the like, or to consider the wind direction.

  Hydrogen sulfide gas is usually processed in a detoxification tower, scrubber, and flare equipment. When processing with a flare facility, environmental problems arise because SOx is generated by burning hydrogen sulfide gas. On the other hand, when treating with abatement equipment or scrubber, no environmental problems occur, but neutralizing hydrogen sulfide gas requires a neutralizing agent such as caustic soda, and a neutralizing agent cost is required. . Detoxification equipment, scrubbers, and flare equipment are operated even when hydrogen sulfide gas is not leaking. For this reason, in the case of abatement equipment or a scrubber, a neutralizer for that amount is required, and the cost becomes high.

  In the hydrogen sulfide gas production plant 60, it is required to reduce the cost by reducing the use of the neutralizing agent while maintaining the safety of the exhaust of the hydrogen sulfide gas.

JP 2010-126778 A

  Therefore, in view of such problems, the present invention provides a neutralizing agent required for cost reduction, for example, detoxification of hydrogen sulfide gas, while maintaining safety of exhaust of hydrogen sulfide gas in a hydrogen sulfide gas production plant. An object of the present invention is to provide a hydrogen sulfide gas production plant capable of reducing the amount of hydrogen and reduce the cost, and a method for exhausting hydrogen sulfide gas by the hydrogen sulfide gas production plant.

  As a result of intensive studies to achieve the above object, the inventors of the present invention have developed a hydrogen sulfide gas production plant according to the present invention, at least a reaction facility for generating hydrogen sulfide gas from sulfur and hydrogen gas, A cooling facility that cools the hydrogen sulfide gas, a sulfur removal facility that removes sulfur contained in the hydrogen sulfide gas, and a gas treatment facility that renders the hydrogen sulfide gas harmless. At least one of the removal facilities is surrounded by a building, and is provided in the reaction facility, the cooling facility, and the sulfur removal facility, and has an exhaust facility that exhausts hydrogen sulfide gas leaked from these facilities. The exhaust equipment includes an exhaust pipe having one end branched into a first exhaust pipe for exhausting leaked hydrogen sulfide gas to the atmosphere and a second exhaust pipe for exhausting the gas treatment equipment, and a branch point in the equipment and the exhaust pipe. A concentration measuring device for measuring the concentration of hydrogen sulfide gas, and when the concentration measuring device detects a concentration lower than a predetermined concentration, exhaust the hydrogen sulfide gas into the atmosphere from the first exhaust pipe; And a valve mechanism that controls to exhaust hydrogen sulfide gas from the second exhaust pipe to the gas processing facility when a concentration equal to or higher than a predetermined concentration is detected.

  Further, the exhaust method of the hydrogen sulfide gas production plant according to the present invention is the above-mentioned hydrogen sulfide gas production plant, wherein the valve mechanism is controlled based on the concentration detected by the concentration measuring device and the hydrogen sulfide gas is discharged from the first exhaust pipe. The hydrogen sulfide gas is exhausted into the atmosphere, or the hydrogen sulfide gas is exhausted from a second exhaust pipe to a gas processing facility.

  In the present invention, the hydrogen sulfide gas leaked from each facility in the hydrogen sulfide gas production plant is judged based on the concentration of the leaked hydrogen sulfide gas to determine whether it is necessary to treat the gas treatment facility. By exhausting inside, the operation of the gas treatment facility can be reduced. Thereby, in the present invention, since it is not always necessary to operate the gas processing equipment, while maintaining the safety of the hydrogen sulfide gas exhaust, for example, the use of the neutralizing agent in the gas processing equipment can be reduced, Cost can be reduced.

It is a schematic block diagram which shows an example of a structure of the hydrogen sulfide gas manufacturing plant to which this invention is applied. It is a flowchart of the exhaust method in the same plant. It is a schematic block diagram which shows the structure of the conventional hydrogen sulfide gas manufacturing plant. It is a schematic block diagram which shows the structure of the conventional hydrogen sulfide gas manufacturing plant.

Hereinafter, the hydrogen sulfide gas production plant and the hydrogen sulfide gas exhaust method according to the present invention will be described in detail in the following order. Note that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist of the present invention.
1. 1. Outline of the present invention 2. Hydrogen sulfide gas production plant How to exhaust hydrogen sulfide gas

[1. Outline of the present invention]
The hydrogen sulfide gas production plant according to the present invention is included in at least a reaction facility for generating hydrogen sulfide gas by sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, and hydrogen sulfide gas. A sulfur removal facility for removing sulfur, a gas treatment facility for rendering hydrogen sulfide gas harmless, and an exhaust facility for exhausting hydrogen sulfide gas leaked from facilities other than the gas treatment facility to the atmosphere or the gas treatment facility.

  Since this hydrogen sulfide gas production plant is operated under high-temperature and high-pressure conditions, hydrogen sulfide gas may leak. In this hydrogen sulfide gas production plant, even if it is leaked, it is determined whether or not the leaked hydrogen sulfide gas needs to be rendered harmless, and only when necessary, the hydrogen sulfide gas is treated with the gas treatment facility. When the treatment is not required, that is, when there is no influence on the environment or the human body even if exhausted to the atmosphere, the operation of the gas processing facility can be reduced by exhausting to the atmosphere.

  In addition, in hydrogen sulfide gas production plants, in order to avoid the explosion limit due to hydrogen sulfide gas in facilities with severe operating conditions such as reaction equipment, nitrogen gas was introduced and leaked into parts such as flanges where hydrogen sulfide gas was likely to leak Hydrogen sulfide gas may be removed. In addition, there may be a case where hydrogen sulfide gas remaining in the plant is replaced with nitrogen gas at the time of a predetermined periodic inspection, when a sudden trouble occurs, or when the plant is started up.

  For this reason, the hydrogen sulfide gas production plant may be further provided with a nitrogen gas supply facility for supplying nitrogen gas to the reaction facility or the like. In the hydrogen sulfide gas production plant, the hydrogen sulfide gas is removed together with the nitrogen gas from the reaction facility or the like by the nitrogen gas ventilated in the facility. Also in the nitrogen gas supply equipment, it is judged whether it is necessary to detoxify the removed hydrogen sulfide gas in the same way as the exhaust equipment, and the hydrogen treatment gas is processed in the gas treatment equipment only when necessary. When there is no exhaust, that is, when there is no influence on the environment or the human body even if exhausted to the atmosphere, the operation of the gas processing facility can be reduced by exhausting to the atmosphere.

[2. Hydrogen sulfide gas production plant]
FIG. 1 is a schematic diagram illustrating an example of a configuration of a hydrogen sulfide gas production plant 10. A hydrogen sulfide gas production plant 10 shown in FIG. 1 includes a reaction facility 11 for generating hydrogen sulfide gas, a plurality of cooling facilities 12 for cooling the generated hydrogen sulfide gas, and sulfur by removing sulfur in the hydrogen sulfide gas. And a sulfur removal facility 13 for supplying the hydrogen sulfide gas from which is removed. The hydrogen sulfide gas production plant 10 also includes a supply pipe 14 that supplies the hydrogen sulfide gas from which sulfur has been removed in the sulfur removal facility 13 to the sulfurization treatment plant.

  Further, the hydrogen sulfide gas production plant 10 collects and stores the sulfur removed by the sulfur removal equipment 13 and adjusts the heat balance in the blowdown equipment 15 that supplies the sulfur treatment equipment and the reaction equipment 11. Therefore, a sulfur cooling facility 16 for cooling sulfur is provided.

  Further, the hydrogen sulfide gas production plant 10 includes, for example, a gas treatment facility 17 for detoxifying the hydrogen sulfide gas leaked from the reaction facility 11, the cooling facility 12, and the sulfur removal facility 13, and the reaction facility 11, the cooling facility 12, and the sulfur removal. And an exhaust facility 18 for exhausting the hydrogen sulfide gas leaked from the facility 13 to the atmosphere or the gas processing facility 17.

  Furthermore, the hydrogen sulfide gas production plant 10 may include a nitrogen gas supply facility 19 that supplies nitrogen gas to the reaction facility 11 and the like.

First, each facility will be described.
(Reaction equipment)
The reaction facility 11 includes, for example, a reactor 20, a quench tower 21, a heater 22, and a building 23. The reaction facility 11 generates a hydrogen sulfide gas generation reaction by the supplied sulfur and hydrogen gas, and generates hydrogen sulfide gas. More specifically, the molten sulfur is stored in the reactor 20, and hydrogen gas is supplied from the lower part thereof, so that the reaction proceeds while the upward flow of the hydrogen gas passes through the molten sulfur, and the hydrogen sulfide gas is generated. Occur. Most of the hydrogen sulfide gas generated here is hydrogen sulfide, but part of it contains sulfur vapor that is entrained when the hydrogen gas passes through the reactor 20.

  The reaction facility 11 is operated under relatively high temperature and high pressure conditions of a temperature of about 470 ° C. and a pressure of about 800 kPaG, and the generated hydrogen sulfide gas is also at a high temperature and pressure. The hydrogen sulfide gas generated in the reaction facility 11 is about 150 ° C. when passing through the quench tower 21 as a result of heat exchange with the supplied sulfur.

  Since the reaction facility 11 is operated under high temperature and high pressure conditions, a part of the generated hydrogen sulfide gas may leak from the reactor 20 or the quencher 21. In the reaction facility 11, the reactor 20, the quench tower 20, and the like are surrounded by the building 23, so that even if part of the hydrogen sulfide gas leaks, it is not directly exhausted into the atmosphere but remains in the building 23. The hydrogen sulfide gas accumulated in the building 23 is exhausted by an exhaust facility 18 described later.

(Cooling equipment)
The cooling facility 12 collects hydrogen sulfide gas generated in the reaction facility 11. The cooling temperature of the hydrogen sulfide gas in the cooling facility 12 is not particularly limited, and is preferably lower in order to reduce the sulfur content in the hydrogen sulfide gas. Specifically, since normal (cooling) water is used, it is cooled to about 50 ° C.

  The hydrogen sulfide gas production plant 10 includes a plurality of cooling facilities 12. In the cooling facility 12, a part of the sulfur contained in the recovered hydrogen sulfide gas is solidified and fixed inside the facility (heat transfer surface). For this reason, by providing a plurality of cooling facilities 12, they can be used by alternately switching them to prevent a decrease in operating efficiency due to a decrease in cooling capacity. The hydrogen sulfide gas production plant 10 shown in FIG. 1 is an example having two systems of cooling facilities 12A and 12B.

  Further, in the cooling facilities 12A and 12B, for example, a jacket is provided around the lower portion thereof, and the fixed sulfur can be melted by heating with steam. In the cooling facilities 12A and 12B, for example, when sulfur is fixed inside the cooling facility 12A, the use of the cooling facility 12A is stopped and switched to the cooling facility 12B. In the cooling facility 12A whose use has been stopped, sulfur fixed by steam is melted and recovered.

  Here, since the cooling facilities 12A and 12B cool the hydrogen sulfide gas until just before the facilities whose use has been temporarily stopped, the high-pressure and high-concentration hydrogen sulfide gas is held therein. Therefore, in the melt recovery process of sulfur fixed inside, it is necessary to discharge the hydrogen sulfide gas in the cooling facilities 12A and 12B for melting and recovering the sulfur and reduce the internal pressure. In the hydrogen sulfide gas production plant 10, the hydrogen sulfide gas discharged at this time becomes so-called waste hydrogen sulfide gas, which is generated in the cooling facilities 12A and 12B.

  As a discharge aspect of the waste hydrogen sulfide gas from the hydrogen sulfide gas production plant 10, for example, the waste hydrogen sulfide gas is discharged to the blowdown facility 15 described later together with the sulfur melted and recovered in the cooling facilities 12 </ b> A and 12 </ b> B. And is discharged from an outlet 24 provided in the blow-down facility 15. Alternatively, the waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B may be directly discharged from the discharge ports provided in the cooling facilities 12A and 12B.

  In addition, when discharging waste hydrogen sulfide gas from the discharge port 24 provided in the blowdown facility 15, as shown in FIG. 1, the discharge port 24 of the blowdown facility 15 and the treatment plant A using the hydrogen sulfide gas are connected. A pipe 31 described later is provided so as to be connected. Further, when the waste hydrogen sulfide gas is directly discharged from the discharge ports provided in the cooling facilities 12A and 12B, the discharge ports of the cooling facilities 12A and 12B and the processing plant A using the hydrogen sulfide gas are connected. A pipe 31 to be described later may be provided.

  The cooling facilities 12A and 12B are provided in the building 25. Since the cooling facilities 12A and 12B hold high-pressure and high-concentration hydrogen sulfide gas, the hydrogen sulfide gas may leak. By surrounding the cooling facilities 12 </ b> A and 12 </ b> B with the building 25, even if part of the hydrogen sulfide gas leaks, it is not exhausted directly into the atmosphere, but remains in the building 25. Further, when the waste hydrogen sulfide gas is directly discharged from the discharge port, the waste hydrogen sulfide gas may be discharged into the building 25. The hydrogen sulfide gas and waste hydrogen sulfide gas accumulated in the building 25 are exhausted from the building 25 by an exhaust facility 18 described later.

(Sulfur removal equipment)
The sulfur removal facility (knockout facility) 13 removes sulfur mixed in the hydrogen sulfide gas cooled by the cooling facilities 12A and 12B. Then, the sulfur removal facility 13 supplies the hydrogen sulfide gas from which sulfur has been removed to a sulfidation treatment plant that uses the hydrogen sulfide gas.

  The hydrogen sulfide gas generated in the reaction facility 11 partially contains sulfur vapor. In the sulfur removal equipment 13, the sulfur vapor is solidified and deposited on the bottom, and is melted and recovered by, for example, heating with steam through a jacket installed in the outer periphery of the lower part. The recovered sulfur is transferred to a blowdown facility 15 described later.

  Note that the sulfur treatment plant to which the sulfur removal facility 13 supplies the hydrogen sulfide gas may be the same as or different from the treatment plant A that supplies the waste hydrogen sulfide gas via the piping 31 described later. For example, examples of the sulfidation treatment plant include a sulfidation process plant and a dezincification process plant used in a hydrometallurgy method of nickel oxide ore.

  The sulfur removal facility 13 is provided in the building 26 in preparation for leakage of hydrogen sulfide gas. By surrounding the sulfur removal equipment 13 with the building 26, even if a part of the hydrogen sulfide gas leaks, it is not exhausted directly into the atmosphere but remains in the building 26. The hydrogen sulfide gas accumulated in the building 26 is exhausted from the building 26 by an exhaust facility 18 described later.

(Plumbing)
The supply pipe 14 led out from the sulfur removal facility 13 is connected to the sulfidation treatment plant, and supplies hydrogen sulfide gas from which sulfur has been removed to the sulfidation treatment plant. The supply pipe 14 is provided with an ON / OFF valve 27 for controlling the supply of hydrogen sulfide gas to the sulfidation treatment plant. The supply pipe 14 includes a pressure gauge 28 for measuring the pressure of the hydrogen sulfide gas supplied to the sulfidation treatment plant, a flow meter 29 for measuring the flow rate of the hydrogen sulfide gas, and a control for controlling the supply of the hydrogen sulfide gas. A valve 30 is provided.

(Blowdown equipment)
The blow-down facility 15 recovers sulfur removed from the hydrogen sulfide gas by the sulfur removal facility 13. Moreover, the blowdown facility 15 collects sulfur that has adhered to the cooling facilities 12A and 12B. The blow-down facility 15 supplies the recovered sulfur to, for example, a sulfur treatment plant using the supply pump 30. Alternatively, the recovered sulfur may be recycled as a sulfur source to be supplied to the reaction facility 11 again.

  The blow-down facility 15 is provided with a discharge port 24 for discharging waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B and discharged to the blow-down facility 15 to the outside of the system. As shown in FIG. 1, the blow-down facility 15 is connected to a treatment plant A that uses hydrogen sulfide gas by connecting a pipe 31 to the discharge port 24, and waste discharged from the discharge port 24. Hydrogen sulfide gas is supplied to the processing plant A through the pipe 31.

  In addition, it does not specifically limit as the processing plant A which supplies waste hydrogen sulfide gas, What is necessary is just a processing plant which uses hydrogen sulfide gas. For example, a sulfidation process plant or a dezincification process plant used in the above-described method for hydrometallizing nickel oxide ore can be used. In the treatment plant A, the operating pressure of the hydrogen sulfide gas is lower than the operating pressure condition (780 to 800 kPaG) in the reaction equipment 11 of the plant 10. It is preferable in that waste hydrogen sulfide gas can be supplied.

(Sulfur cooling equipment)
The sulfur cooling facility 16 cools sulfur from about 470 ° C. to about 150 ° C. in order to adjust the heat balance in the reaction facility 11. In addition, the sulfur cooling facility 16 supplies the cooled sulfur to, for example, the blowdown facility 15 and supplies it to the sulfur treatment plant and the like together with the sulfur recovered from the cooling facilities 12A and 12B and the sulfur removal facility 13. Further, the sulfur cooling facility 16 may circulate and use the cooled sulfur as a sulfur source to be supplied to the reaction facility 11 again using the circulation pump 32.

(Gas treatment equipment)
The gas treatment facility 17 is a detoxification facility that neutralizes the hydrogen sulfide gas leaked from each facility with a neutralizing agent such as caustic soda to make it harmless, and detoxifies the hydrogen sulfide gas by burning it to reduce toxicity However, there is no particular limitation as long as the hydrogen sulfide gas can be rendered harmless. The gas treatment facility 17 is connected to an exhaust facility 18 and a nitrogen gas supply facility 19 which will be described later, and detoxifies the hydrogen sulfide gas sent from these facilities.

(Exhaust equipment)
The exhaust facility 18 is provided in, for example, the reaction facility 11 that generates hydrogen sulfide gas, the cooling facility 12 that processes the hydrogen sulfide gas, and the sulfur removal facility 13. The exhaust facility 18 is not limited to being provided in these facilities, and may be provided in other facilities where hydrogen sulfide gas may leak in the hydrogen sulfide gas production plant 10.

  The exhaust facility 18 includes an exhaust pipe 40 that exhausts hydrogen sulfide gas to the atmosphere. The exhaust pipe 40 is led out from the buildings 23, 25, and 26 and connected to the atmosphere. The exhaust pipe 40 is connected to the first exhaust pipe 40 a that exhausts hydrogen sulfide gas into the atmosphere and the gas processing facility 17. One end is branched to the second exhaust pipe 40b to be exhausted.

  Further, the exhaust equipment 18 is provided between the buildings 23, 25, and 26 and the branch point of the exhaust pipe 40, and a concentration measuring device 41 that measures the concentration of leaked hydrogen sulfide gas, and a measurement by the concentration measuring device 41. A valve mechanism 42 for controlling the exhaust of the first exhaust pipe 40a and the second exhaust pipe 40b based on the result is provided.

  As long as the valve mechanism 42 can control the exhaust of the first exhaust pipe 40a and the second exhaust pipe 40b, the type and arrangement of the valves are not limited. The type of the valve mechanism 42 is, for example, an ON / OFF valve, but is not limited to this, and a control valve may be used. By switching ON / OFF of the valve mechanism 42, separation / connection between the buildings 23, 25, 26 and the atmosphere and the gas processing facility 17 can be switched. Here, the ON / OFF valve provided in the first exhaust pipe 40a is referred to as a first ON / OFF valve 42a, and the ON / OFF valve provided in the second exhaust pipe 40b is referred to as a second ON / OFF valve 42b. To do. The first ON / OFF valve 42a and the second ON / OFF valve 42b are normally in an OFF state, that is, the first exhaust pipe 40a and the second exhaust pipe 40b are closed.

  Further, the exhaust equipment 18 may be provided with a fan 43 between the concentration measuring device 41 and the branch point in order to improve the flow of hydrogen sulfide gas. The exhaust facility 18 may be provided with an alarm so that an alarm is generated depending on the concentration of hydrogen sulfide gas.

  In the exhaust facility 18, the concentration of the hydrogen sulfide gas leaked into the buildings 23, 25, and 26 is measured by the concentration measuring device 41. When the measurement result of the concentration measuring device 41 is less than a predetermined concentration, the first ON / OFF is performed. The valve 42a is turned on to be opened, the buildings 23, 25, and 26 are connected to the atmosphere via the first exhaust pipe 40a, the second ON / OFF valve 42b is turned off, and the second exhaust pipe The buildings 23, 25, and 26 are not connected to the gas processing facility 17 through 40b. By controlling in this way, the hydrogen sulfide gas in the buildings 23, 25, and 26 is exhausted to the atmosphere.

  On the other hand, when the measurement result of the concentration measuring device 41 is a concentration equal to or higher than a predetermined concentration, on the contrary, the first ON / OFF valve 42a is turned off and closed, and the building is connected via the first exhaust pipe 40a. 23, 25, 26 and the atmosphere are not connected, the second ON / OFF valve 42b is turned ON, and the buildings 23, 25, 26 and the gas processing equipment 17 are connected via the second exhaust pipe 40b. To be. By controlling in this way, the hydrogen sulfide gas in the buildings 23, 25 and 26 is exhausted to the gas processing facility 17.

  Here, the control of the ON / OFF valves 42a and 42b is based on the measurement result by the concentration measuring device 41 to determine whether or not the concentration of the hydrogen sulfide gas is a concentration at which the hydrogen sulfide gas may be exhausted to the atmosphere. ON or OFF control is performed. Hydrogen sulfide gas is said to be highly dangerous, but if the concentration is low, it will not affect the environment or the human body even if it is exhausted to the atmosphere. In general, a concentration of 1 ppm is a working environment management concentration in the Industrial Safety and Health Act, 5 ppm is an allowable concentration in the Japan Society for Occupational Health, and 50 to 100 ppm is said to cause symptoms, activation stimuli, conjunctivitis, and the like. That is, if the concentration is less than 5 ppm, it can be said that there is no influence on the human body or the environment.

  Therefore, in the exhaust facility 18 in the present embodiment, it is preferable that the predetermined concentration of the hydrogen sulfide gas is 5 ppm. That is, in the exhaust equipment 18, when the concentration of the hydrogen sulfide gas is less than 5 ppm as measured by the concentration measuring device 41, the hydrogen sulfide gas is exhausted from the first exhaust pipe 40a to the atmosphere, and the concentration is 5 ppm or more. In some cases, it is preferable to control the valve mechanism 42 so as to exhaust the hydrogen sulfide gas from the second exhaust pipe 40 b to the gas processing facility 17 in order to render the hydrogen sulfide gas harmless in the gas processing facility 17. An alarm may be sounded when 1 ppm is reached.

  In the exhaust equipment 18 having the above-described configuration, the concentration of the hydrogen sulfide gas leaked by the concentration measuring device 41 is measured. When the concentration is, for example, less than 5 ppm, the hydrogen sulfide gas is exhausted to the atmosphere. Thereby, in the hydrogen sulfide gas production plant 10, it is not necessary to always operate the gas treatment facility 17. For example, in the abatement facility, it is not necessary to always neutralize the hydrogen sulfide gas to make it harmless. Usage can be reduced and costs can be reduced.

  In the exhaust equipment 18, the installation position of the valve mechanism 42 is not limited to being provided in the first exhaust pipe 40a and the second exhaust pipe 40b, but the first exhaust pipe 40a and the second exhaust pipe 40b. One valve may be provided at the branch point as long as one of the valves is opened and the other is closed.

(Nitrogen gas supply equipment)
The nitrogen gas supply facility 19 is a portion in which hydrogen sulfide gas such as the flange portion is liable to leak in order to avoid an explosion limit in the reactor 20 or the quench tower 21 of the reaction facility 11 having severe operating conditions in the hydrogen sulfide gas production plant 10. Nitrogen gas is constantly flowing. In the hydrogen sulfide gas production plant 10, by always supplying nitrogen gas to the flange portion or the like, the explosion limit can be avoided by removing the hydrogen sulfide gas leaked with the nitrogen gas from the reaction facility. Further, in the hydrogen sulfide gas production plant 10, the hydrogen sulfide gas production plant 10 is separated from the hydrogen sulfide gas production plant 10 and the processing plant at the time of predetermined periodic inspection, sudden trouble occurrence, or when the plant is started up. A process of replacing the inside of the plant 10 with nitrogen gas or the like is performed. For this reason, in such a case, the nitrogen gas supply equipment 19 supplies nitrogen gas into the plant 10. FIG. 1 shows a nitrogen gas supply facility 19 that supplies nitrogen gas to the flanges and the like of the reactor 20 and the quench tower 21 and omits the nitrogen gas supply facility at the time of periodic inspection.

  In the nitrogen gas supply equipment 19, nitrogen gas is supplied from the outside of the reactor 20 and the quench tower 21 to a portion where hydrogen sulfide gas easily leaks, such as a flange portion, and ventilated. Thereby, when nitrogen gas passes through a flange part etc., hydrogen sulfide gas is extruded from a flange part etc. with nitrogen gas.

  The hydrogen sulfide gas extruded together with the nitrogen gas is normally detoxified in the gas treatment facility 17 by neutralization or combustion. However, in the present embodiment, similarly to the exhaust equipment 18 described above, it is determined whether to exhaust to the atmosphere or the gas processing equipment 17 depending on the concentration of hydrogen sulfide gas, and the operation of the gas processing equipment 17 is reduced. be able to.

  Specifically, the nitrogen gas supply equipment 19 includes a mixed gas exhaust pipe 45 that exhausts nitrogen gas supplied to the reactor 20 and the quench tower 21 via the supply pipe 44 and hydrogen sulfide gas removed from the flange portion and the like. The mixed gas exhaust pipe 45 is branched at one end into a first mixed gas exhaust pipe 45a that exhausts nitrogen gas and hydrogen sulfide gas to the atmosphere and a second mixed gas exhaust pipe 45b that exhausts the gas processing equipment 17. doing.

  Further, the nitrogen gas supply equipment 19 is provided between the reactor 20 and the quench tower 21 and the branch point of the mixed gas exhaust pipe 45, and a concentration measuring device 46 for measuring the concentration of the removed hydrogen sulfide gas, and a concentration measurement A valve mechanism 47 for controlling the exhaust of the first mixed gas exhaust pipe 45a and the second mixed gas exhaust pipe 45b based on the measurement result of the vessel 46 is provided.

  The type and arrangement of the valve are not limited as long as the valve mechanism 47 can control the exhaust of the first mixed gas exhaust pipe 45a and the second mixed gas exhaust pipe 45b. The type of the valve mechanism 47 is, for example, an ON / OFF valve, but is not limited to this, and a control valve may be used. By switching ON / OFF of the valve mechanism 47, separation / connection between the reactor 20 and the quench tower 21 and the atmosphere and the gas processing facility 17 can be switched. Here, the ON / OFF valve provided in the first mixed gas exhaust pipe 45a is the first ON / OFF valve 47a, and the ON / OFF valve provided in the second mixed gas exhaust pipe 45b is the second ON / OFF valve. The OFF valve 47b is used. The first ON / OFF valve 47a and the second ON / OFF valve 47b are normally in an OFF state, that is, the first mixed gas exhaust pipe 45a and the second mixed gas exhaust pipe 45b are closed.

  Furthermore, the nitrogen gas supply equipment 19 may be provided with a fan 48 for improving the flow of nitrogen gas and hydrogen sulfide gas between the concentration measuring device 46 and the branch point, for example.

  The nitrogen gas supply equipment 19 measures the concentration of the removed hydrogen sulfide gas with the concentration measuring device 46, and when the measurement result of the concentration measuring device 46 is less than a predetermined concentration, the first ON / OFF valve 47a is turned on. The reactor 20 and the quench tower 21 are connected to the atmosphere via the first mixed gas exhaust pipe 45a, the second ON / OFF valve 47b is turned OFF, and the second mixed gas exhaust pipe 45b is connected. The reactor 20 and the quench tower 21 are not connected to the gas processing equipment 17 via the. By controlling in this way, the hydrogen sulfide gas and the nitrogen gas in the reactor 20 and the quench tower 21 are exhausted to the atmosphere.

  On the other hand, when the measurement result of the concentration measuring device 46 is a concentration equal to or higher than a predetermined concentration, conversely, the first ON / OFF valve 47a is turned OFF and closed, and the first mixed gas exhaust pipe 45a is connected. Thus, the reactor 20 and the quench tower 21 are not connected to the atmosphere, the second ON / OFF valve 47b is turned on to be opened, and the reactor 20 and the quench tower 21 and the gas are connected via the second mixed gas exhaust pipe 45b. The processing equipment 17 is connected. By controlling in this way, the hydrogen sulfide gas and the nitrogen gas are exhausted to the gas processing facility 17.

  Here, the control of the ON / OFF valve is the same as that of the exhaust equipment 18 described above. Based on the measurement result by the concentration measuring device 46, it is determined whether or not the concentration of the hydrogen sulfide gas is a concentration that can be exhausted to the atmosphere. Judgment is made and ON or OFF control is performed. In the nitrogen gas supply equipment 19, as in the exhaust equipment 18 described above, when the concentration of the hydrogen sulfide gas is less than 5 ppm as measured by the concentration measuring device 46, the hydrogen sulfide gas is removed from the first mixed gas exhaust pipe 45a. When exhausted into the atmosphere and the concentration is 5 ppm or more, the valve mechanism 47 is configured to exhaust the hydrogen sulfide gas from the second mixed gas exhaust pipe 45b to the gas processing facility 17 in order to render the gas processing facility 17 harmless. It is preferable to control.

  In the nitrogen gas supply equipment 19, the installation position of the valve mechanism 47 is not limited to being provided in each of the first mixed gas exhaust pipe 45 a and the second mixed gas exhaust pipe 45 b, but the first mixed gas exhaust pipe One valve may be provided at the branch point as long as the valve is one in which one of the 45a and the second mixed gas exhaust pipe 45b is opened and the other is closed.

  In the nitrogen gas supply equipment 19 configured as described above, the concentration of the hydrogen sulfide gas leaked by the concentration measuring device 46 is measured, and when it is less than 5 ppm, for example, the hydrogen sulfide gas is exhausted to the atmosphere. Thereby, in the hydrogen sulfide gas production plant 10, it is not necessary to always operate the gas treatment facility 17. For example, in the abatement equipment, it is not always necessary to neutralize the hydrogen sulfide gas with the gas treatment facility 17 to make it harmless. The use of the neutralizing agent can be reduced, and the cost can be reduced.

  In the hydrogen sulfide gas production plant 10 having the above-described configuration, the hydrogen sulfide gas generated in the reaction facility 11 is cooled by the cooling facility 12, and the sulfur mixed in the sulfur removal facility 13 is removed to produce hydrogen sulfide gas. . The produced hydrogen sulfide gas is sent from the supply pipe 14 to a sulfur treatment plant that uses the hydrogen sulfide gas.

  Further, in the hydrogen sulfide gas plant 10, waste hydrogen sulfide gas generated in the cooling facility 12 is recovered and supplied to the treatment plant A such as a sulfidation process plant. Hydrogen sulfide gas can be efficiently recovered and used effectively in the processing plant A. Moreover, since the waste hydrogen sulfide gas does not need to be processed by a flare facility or a gas processing facility as in the conventional case, the use cost of a recovery solvent such as caustic soda can be eliminated, and the operation cost can be greatly reduced.

  In the hydrogen sulfide gas production plant 10 operating in this way, when hydrogen sulfide gas leaks into the buildings 23, 25, and 26 of the reaction facility 11 or the like, the gas processing facility 17 is used when exhausting the leaked hydrogen sulfide gas. If the concentration of hydrogen sulfide gas has little influence on the human body and the environment and there is no problem even if it is exhausted to the atmosphere, the operation of the gas treatment facility 17 may be reduced by exhausting to the atmosphere. it can. Thereby, in the hydrogen sulfide gas production plant 10, for example, the use amount of the neutralizing agent is reduced, and the cost can be reduced.

[3. Method of exhausting hydrogen sulfide gas]
Next, a specific exhaust method of the hydrogen sulfide gas production plant 10 will be described. In addition, the exhaust equipment 18 provided in each equipment is each independently operated according to the leaked hydrogen sulfide gas concentration.

  First, as shown in FIG. 2, in step 1, the concentration measuring device 41 measures the concentration of hydrogen sulfide gas leaked into the buildings 23, 25, and 26 of the reaction facility 11, the cooling facility 12, and the sulfur removal facility 13. To do.

  Next, in step 2, it is determined whether or not the measurement result of the concentration measuring device 41 is less than a predetermined concentration. The predetermined concentration refers to a concentration that does not affect the environment or the human body even if the leaked hydrogen sulfide gas is exhausted to the atmosphere. As described above, 5 ppm is an allowable concentration in the Japan Society for Occupational Health, and 50 to 100 ppm is said to cause symptoms, activation stimuli, conjunctivitis, and the like, and the predetermined concentration may be, for example, 5 ppm. preferable.

  Next, when the concentration of the hydrogen sulfide gas is less than the predetermined concentration in Step 2 (Yes), the process proceeds to Step 3. In step 3, the first ON / OFF valve 42a provided in the first exhaust pipe 40a is opened, and the second ON / OFF valve 42b provided in the second exhaust pipe 40b is closed.

  In step 4, the first ON / OFF valve 42a is opened in step 3, and the second ON / OFF valve 42b is closed, so that the buildings 23, 25, 26 and the atmosphere are connected, and the buildings 23, 25, 26 and the gas treatment equipment 17 remain separated, so that a pressure difference occurs, and the hydrogen sulfide gas in the buildings 23, 25, 26 is exhausted to the atmosphere. The

  On the other hand, if the concentration of the hydrogen sulfide gas is not less than the predetermined concentration in Step 2 (No), the process proceeds to Step 5. In step 5, the first ON / OFF valve 42a provided in the first exhaust pipe 40a is closed, and the second ON / OFF valve 42b provided in the second exhaust pipe 40b is opened.

  In step 6, the first ON / OFF valve 42a is closed in step 5, and the second ON / OFF valve 42b is opened, so that the buildings 23, 25, 26 and the gas processing equipment 17 are connected, and the buildings 23, 25, 26 and the atmosphere remain separated, so that a pressure difference occurs, and the hydrogen sulfide gas in the buildings 23, 25, 26 is transferred to the gas processing equipment 17. Exhausted.

  As described above, in the hydrogen sulfide gas production plant 10, when the concentration of the hydrogen sulfide gas leaked into the buildings 23, 25, 26 is less than a predetermined concentration, the gas processing facility 17 is exhausted to the atmosphere. Therefore, the cost can be reduced while maintaining the safety of the exhaust of hydrogen sulfide gas.

  Further, even when the nitrogen gas supply facility 19 is provided in the hydrogen sulfide gas production plant 10, the hydrogen sulfide gas is similarly exhausted. In addition, since the exhaust method in the nitrogen gas supply equipment 19 is the same as that of the above-mentioned exhaust equipment 18, it demonstrates using FIG.

  In step 1, the concentration of hydrogen sulfide gas leaked to the flanges of the reactor 20 and the quench tower 21 is measured by a concentration measuring device 46 provided in the pipe 45.

  Next, in step 2, it is determined whether or not the measurement result of the concentration measuring device 46 is less than a predetermined concentration. The predetermined concentration is the same as that in the case of the exhaust facility 18 and will not be described.

  Next, when the concentration of the hydrogen sulfide gas is less than the predetermined concentration in Step 2 (Yes), the process proceeds to Step 3. In step 3, the first ON / OFF valve 47a provided in the first mixed gas exhaust pipe 45a is opened, and the second ON / OFF valve 47b provided in the second mixed gas exhaust pipe 45b is closed. .

  In step 4, the first ON / OFF valve 47a is opened in step 3 and the second ON / OFF valve 47b is closed, so that the reactor 20 and the reactor 20 are connected via the first mixed gas exhaust pipe 45a. Since the quench tower 21 and the atmosphere are connected and the reactor 20 and the quench tower 21 and the gas processing equipment 17 remain separated, a pressure difference is generated, and the hydrogen sulfide gas in the reactor 20 and the quench tower 21 enters the atmosphere. Exhausted.

  On the other hand, if the concentration of the hydrogen sulfide gas is not less than the predetermined concentration in Step 2 (No), the process proceeds to Step 5. In step 5, the first ON / OFF valve 47a provided in the first nitrogen gas pipe is closed, and the second ON / OFF valve 47b provided in the second mixed gas exhaust pipe 45b is opened.

  In Step 6, the first ON / OFF valve 47a is closed in Step 5, and the second ON / OFF valve 47b is opened, so that the reactor 20 and the reactor 20 are connected via the second mixed gas exhaust pipe 45b. Since the quench tower 21 and the gas processing facility 17 are connected and the reactor 20 and the quench tower 21 and the atmosphere remain separated, a pressure difference is generated, and the hydrogen sulfide gas in the reactor 20 and the quench tower 21 is converted into the gas processing facility. 17 is exhausted.

  As described above, in the hydrogen sulfide gas production plant 10, even when the hydrogen sulfide gas is removed together with the nitrogen gas supplied to the reactor 20 and the quench tower 21, the exhaust gas is exhausted to the atmosphere according to the concentration of the hydrogen sulfide gas. By doing so, the processing in the gas processing facility 17 can be reduced, and the cost can be reduced while maintaining the safety of the exhaust of the hydrogen sulfide gas.

  As described above, in the hydrogen sulfide gas production plant 10, it is not necessary to always neutralize the hydrogen sulfide gas in the gas treatment equipment 17, for example, in the abatement equipment, so that the amount of neutralizing agent used can be reduced. . Thereby, in the hydrogen sulfide gas production plant 10, the cost can be reduced while maintaining the safety of the exhaust of the hydrogen sulfide gas. In addition, when a flare equipment is used for the gas treatment equipment 17, it is not necessary to always burn hydrogen sulfide gas to reduce toxicity, so that the generation of SOx can be reduced.

  Further, in the hydrogen sulfide gas production plant 10, all of the hydrogen sulfide gas removed together with the nitrogen gas in the nitrogen gas supply facility 19 is not exhausted to the gas treatment facility 17, and the neutralization treatment is required as in the exhaust facility 18. In the case where only the gas processing facility 17 can be exhausted to the atmosphere, the neutralization treatment in the gas processing facility 17 can be reduced by exhausting to the atmosphere. Therefore, in the hydrogen sulfide gas production plant 10, even when the nitrogen gas supply facility 19 is provided, the operation of the gas processing facility 17 can be reduced, and the cost of the hydrogen sulfide gas can be reduced while maintaining the safety of the exhaust of the hydrogen sulfide gas. The generation of SOx can be reduced.

(Other embodiments)
In FIG. 1, a hydrogen sulfide gas production plant 10 including a reaction facility 11, a cooling facility 12, a sulfur recovery facility 13, a gas treatment facility 17, an exhaust facility 18, and a nitrogen gas supply facility 19 is shown. However, the present invention is not limited to this, and the hydrogen sulfide gas production plant 10 may have a plurality of systems. In the case of having a plurality of systems, each plant 10 is connected, and even if inspection or trouble occurs in one plant 10, production of hydrogen sulfide gas is maintained by operating another plant 10. can do. Moreover, even if it has a some system | strain in this way, operation | movement of gas processing equipment can be suppressed by exhaust equipment and nitrogen gas supply equipment similarly to the hydrogen sulfide gas manufacturing plant mentioned above in each plant.

  DESCRIPTION OF SYMBOLS 10 Hydrogen sulfide gas production plant, 11 Reaction equipment, 12 Cooling equipment, 13 Sulfur removal equipment, 14 Supply pipe, 15 Blow down equipment, 16 Sulfur cooling equipment, 17 Gas processing equipment, 18 Exhaust equipment, 19 Nitrogen gas supply equipment, 40 Exhaust pipe, 41 Concentration measuring instrument, 42 Valve mechanism, 42a First ON / OFF valve, 43 Fan, 44 Supply pipe, 45 Exhaust pipe, 46 Concentration measuring instrument, 47 Valve mechanism, 47a First ON / OFF valve, 47b First ON / OFF valve, 48 fans

Claims (16)

Reaction equipment for generating hydrogen sulfide gas with at least sulfur and hydrogen gas, cooling equipment for cooling the generated hydrogen sulfide gas, sulfur removal equipment for removing sulfur contained in the hydrogen sulfide gas, and the hydrogen sulfide A hydrogen sulfide gas production plant comprising a gas processing facility for detoxifying gas,
At least one of the reaction equipment, the cooling equipment, and the sulfur removal equipment is surrounded by a building,
Provided in the reaction equipment, the cooling equipment and the sulfur removal equipment, and having exhaust equipment for exhausting hydrogen sulfide gas leaked from the equipment,
The exhaust system is
An exhaust pipe having one end branched into a first exhaust pipe for exhausting leaked hydrogen sulfide gas to the atmosphere and a second exhaust pipe for exhausting to the gas treatment facility;
A concentration measuring device that is provided between the facility and the branch point in the exhaust pipe and measures the concentration of the hydrogen sulfide gas;
When the concentration measuring device detects a concentration lower than a predetermined concentration, the hydrogen sulfide gas is exhausted from the first exhaust pipe to the atmosphere, and when a concentration higher than a predetermined concentration is detected, the second concentration is detected. And a valve mechanism for controlling the hydrogen sulfide gas to be exhausted from the exhaust pipe to the gas processing facility.   2. The sulfide according to claim 1, wherein the valve mechanism includes a valve that is provided at the branch point and opens one of the first exhaust pipe and the second exhaust pipe and closes the other. Hydrogen gas production plant.   The hydrogen sulfide gas production plant according to claim 1 or 2, wherein the exhaust pipe is provided with a fan between the concentration measuring device and the branch point. Furthermore, it has nitrogen gas supply equipment for supplying nitrogen gas to at least the reaction equipment and removing leaked hydrogen sulfide gas from the reaction equipment,
The nitrogen gas supply equipment is
A mixed gas exhaust pipe having one end branched into a first mixed gas exhaust pipe for exhausting the leaked hydrogen sulfide gas together with the nitrogen gas to the atmosphere and a second mixed gas exhaust pipe for exhausting to the gas processing facility When,
A concentration measuring device that is provided between the reaction facility and a branch point in the mixed gas exhaust pipe and measures the concentration of the hydrogen sulfide gas;
When the concentration measuring device detects a concentration lower than a predetermined concentration, the nitrogen gas and the hydrogen sulfide gas are exhausted from the first mixed gas exhaust pipe to the atmosphere, and a concentration higher than the predetermined concentration is detected. 4. The valve mechanism according to claim 1, further comprising: a valve mechanism that controls the nitrogen gas and the hydrogen sulfide gas to be exhausted from the second mixed gas exhaust pipe to the gas processing facility. The hydrogen sulfide gas production plant of any one of Claims.   The valve mechanism of the nitrogen gas supply equipment is provided at a branch point between the first mixed gas exhaust pipe and the second mixed gas exhaust pipe, and the first mixed gas exhaust pipe and the second mixed gas are provided. The hydrogen sulfide gas production plant according to claim 4, comprising a valve that opens one of the exhaust pipes and closes the other.   The hydrogen sulfide gas production plant according to claim 4 or 5, wherein the mixed gas exhaust pipe is provided with a fan between the concentration measuring device and the branch point.   The hydrogen sulfide gas production plant according to any one of claims 1 to 6, wherein the predetermined concentration of the hydrogen sulfide gas is 5 ppm.   8. The alarm according to claim 1, wherein the concentration measuring device is provided with an alarm, and the alarm sounds when the concentration of the hydrogen sulfide gas reaches 1 ppm or more. Hydrogen sulfide gas production plant.   The gas treatment facility is a detoxification facility that renders the hydrogen sulfide gas harmless by neutralizing with a neutralizing agent, or a flare facility that renders the harmless by burning the hydrogen sulfide gas. The hydrogen sulfide gas production plant according to any one of claims 1 to 8. Reaction equipment for generating hydrogen sulfide gas with at least sulfur and hydrogen gas, cooling equipment for cooling the generated hydrogen sulfide gas, sulfur removal equipment for removing sulfur contained in the hydrogen sulfide gas, and the hydrogen sulfide A method for exhausting hydrogen sulfide gas in a hydrogen sulfide gas production plant comprising a gas processing facility for rendering gas harmless,
At least one of the reaction equipment, the cooling equipment, and the sulfur removal equipment is surrounded by a building,
The hydrogen sulfide gas production plant is provided in the reaction facility, the cooling facility and the sulfur removal facility, and has an exhaust facility for exhausting hydrogen sulfide gas leaked from these facilities,
The exhaust equipment includes an exhaust pipe having one end branched into a first exhaust pipe for exhausting the leaked hydrogen sulfide gas to the atmosphere and a second exhaust pipe for exhausting the gas treatment equipment, the equipment, and the exhaust pipe A concentration measuring device for measuring the concentration of the hydrogen sulfide gas, and when the concentration measuring device detects a concentration less than a predetermined concentration, the concentration measuring device is provided from the first exhaust pipe. A valve mechanism for controlling the hydrogen sulfide gas to be exhausted from the second exhaust pipe to the gas processing facility when the hydrogen sulfide gas is exhausted to the atmosphere and a concentration higher than a predetermined concentration is detected; And
Based on the concentration detected by the concentration measuring device, the valve mechanism is controlled to exhaust the hydrogen sulfide gas from the first exhaust pipe to the atmosphere, or the hydrogen sulfide gas is exhausted from the second exhaust pipe. A method for exhausting hydrogen sulfide gas, characterized by exhausting to a gas processing facility. The valve mechanism is provided at the branch point, and includes a valve that opens one of the first exhaust pipe and the second exhaust pipe and closes the other;
When the concentration measuring device detects a concentration lower than a predetermined concentration, the valve is used to open the first exhaust pipe and exhaust the hydrogen sulfide gas into the atmosphere.
11. The hydrogen sulfide gas is exhausted to a gas processing facility by opening the second exhaust pipe by the valve when the concentration measuring device detects a concentration higher than a predetermined concentration. The method for exhausting hydrogen sulfide gas as described. The hydrogen sulfide gas production plant further has a nitrogen gas supply facility for supplying nitrogen gas to at least the reaction facility and removing the leaked hydrogen sulfide gas from the reaction facility,
The nitrogen gas supply facility has one end branched into a first mixed gas exhaust pipe for exhausting the leaked hydrogen sulfide gas together with the nitrogen gas to the atmosphere and a second mixed gas exhaust pipe for exhausting the gas processing equipment A concentration measuring device for measuring the concentration of the hydrogen sulfide gas, and a concentration measuring device for measuring the concentration of the hydrogen sulfide gas provided between the reaction facility and the branch point in the mixed gas exhaust tube. When a concentration of less than a predetermined concentration is detected, the nitrogen gas and the hydrogen sulfide gas are exhausted from the first mixed gas exhaust pipe to the atmosphere. A valve mechanism for controlling the nitrogen gas and the hydrogen sulfide gas to be exhausted from the gas exhaust pipe to the gas processing facility,
11. The valve mechanism is controlled based on the concentration detected by the concentration measuring device, and the nitrogen gas and the hydrogen sulfide gas are exhausted to the atmosphere or exhausted to the gas processing facility. Alternatively, the method for exhausting hydrogen sulfide gas according to claim 11. The valve mechanism of the nitrogen gas supply equipment is provided at a branch point between the first mixed gas exhaust pipe and the second mixed gas exhaust pipe, and the first mixed gas exhaust pipe and the second mixed gas are provided. It consists of a valve that opens one of the exhaust pipes and closes the other.
When the concentration measuring device detects a concentration lower than a predetermined concentration, the first mixed gas exhaust pipe is opened by the valve to exhaust the nitrogen gas and the hydrogen sulfide gas to the atmosphere,
When the concentration measuring device detects a concentration equal to or higher than a predetermined concentration, the second mixed gas exhaust pipe is opened by the valve to exhaust the nitrogen gas and the hydrogen sulfide gas to a gas processing facility. The method for exhausting hydrogen sulfide gas according to claim 12, wherein:   The method for exhausting hydrogen sulfide gas according to any one of claims 10 to 13, wherein the predetermined concentration of the hydrogen sulfide gas is 5 ppm.   15. The alarm according to claim 10, wherein the concentration measuring device is provided with an alarm, and the alarm sounds when the concentration of the hydrogen sulfide gas reaches 1 ppm or more. Method of exhausting hydrogen sulfide gas.   The treatment in the gas treatment facility is rendered harmless by neutralizing the hydrogen sulfide gas with a neutralizing agent, or made harmless by burning the hydrogen sulfide gas. Item 16. The method for exhausting hydrogen sulfide gas according to any one of Items 15.

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