CN115854364A - Combustible gas cascade utilization system of whole plant - Google Patents
Combustible gas cascade utilization system of whole plant Download PDFInfo
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- CN115854364A CN115854364A CN202211466657.8A CN202211466657A CN115854364A CN 115854364 A CN115854364 A CN 115854364A CN 202211466657 A CN202211466657 A CN 202211466657A CN 115854364 A CN115854364 A CN 115854364A
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Abstract
The application discloses combustible gas cascade utilization system of whole factory includes: the torch module comprises a liquid separation tank, a water seal tank and a torch and is used for enabling combustible gas to sequentially pass through the liquid separation tank and the water seal tank to be combusted at the torch; the combustible gas recovery module is communicated with the liquid separating tank; the combustible gas recovery module is connected into the combustible gas discharged from the liquid separation tank and used for recovering the combustible gas; the waste gas incineration module is communicated with the combustible gas recovery module and is used for combusting the combustible gas from the combustible gas recovery module to pyrolyze the waste gas so as to discharge the waste gas up to the standard; and the waste heat recovery module is connected with the waste gas incineration module and is used for absorbing the heat of the high-temperature flue gas generated by the waste gas incineration module and generating steam. Utilize the system of this application to carry out classification to the gas of different emission conditions, it can retrieve high calorific value combustible gas simultaneously and store the utilization and handle in order discharge to reach standard to low calorific value waste gas.
Description
Technical Field
The application relates to the technical field of petrochemical industry, concretely relates to combustible gas cascade utilization system of whole factory.
Background
At present, with the development of industry, the components of combustible gas discharged in the industries of petrochemical industry, coal chemical industry, fine chemical industry and the like are more and more complex, the flow fluctuation range is more and more large, and the existing torch system is difficult to meet the requirements of energy conservation and environmental protection. A large amount of combustible gas which cannot be directly utilized and needs to be discharged is generated in the accident states of starting and stopping the production device, normal operation, fire, power failure, water cut and the like, and the combustible gas is directly discharged into a torch system for combustion treatment in the past. At present, with increasingly strict national requirements on energy conservation and emission reduction, the discharged combustible gas needs to be fully utilized.
Disclosure of Invention
An object of the application is to provide a combustible gas cascade utilization system of whole plant for solve the not enough of prior art.
The application provides a combustible gas cascade utilization system of whole factory includes:
the torch module comprises a liquid separation tank, a water seal tank and a torch and is used for enabling combustible gas to sequentially pass through the liquid separation tank and the water seal tank to be combusted at the torch;
the combustible gas recovery module is communicated with the liquid separating tank; the combustible gas recovery module is connected into the combustible gas discharged by the liquid separation tank and is used for recovering the combustible gas;
the waste gas incineration module is communicated with the combustible gas recovery module and is used for combusting the combustible gas from the combustible gas recovery module to pyrolyze the waste gas so as to enable the waste gas to reach the standard and be discharged;
and the waste heat recovery module is connected with the waste gas incineration module and is used for absorbing the heat of the high-temperature flue gas generated by the waste gas incineration module and generating steam.
Optionally, in some embodiments of the present application, if the pressure of the combustible gas is greater than that of the water-sealed tank, the combustible gas enters the torch to continue to be combusted, decompressed and discharged;
and if the pressure of the combustible gas is smaller than that of the water-sealed tank, the combustible gas enters the combustible gas recovery module.
Optionally, in some embodiments of the present application, the water sealing tank has an air inlet, and the water sealing pressure of the air inlet is in a range of 4.5 to 5.5kpa.
Optionally, in some embodiments of the present application, the torch module comprises a torch incandescent lamp for providing a flame seed to ignite the torch;
the torch incandescent lamp is communicated with the combustible gas recovery module and is used for providing combustible gas for the torch incandescent lamp.
Optionally, in some embodiments of the present application, the combustible gas recovery module includes a gas holder, a compressor unit, and a gas-liquid separation tank; the inlet of the gas holder is communicated with the liquid separating tank, and the gas outlet of the gas holder is communicated with the compressor unit and the gas-liquid separating tank; the compressor unit is positioned between the gas holder and the gas-liquid separation tank and is used for compressing the combustible gas entering the gas-liquid separation tank.
Optionally, in some embodiments of the present application, the exhaust incineration module comprises:
the incinerator pilot burner is communicated with the combustible gas recovery module and used for providing combustible gas for the incinerator pilot burner;
the incinerator pilot burner is used for providing fire seeds for the incinerator burner;
and the combustible gas discharged by the combustible gas recovery module enters the combustion furnace hearth for combustion through the combustion furnace burner and is used for pyrolyzing the waste gas in the combustion furnace hearth.
Optionally, in some embodiments of the present application, the waste gas incineration module comprises a flame arrester through which the waste gas enters the incinerator furnace.
Optionally, in some embodiments of the present application, the temperature of the hearth of the incinerator is 800 ℃ to 1200 ℃ for pyrolyzing the exhaust gas to reach the emission standard.
Optionally, in some embodiments of the present application, the waste heat recovery module includes a waste heat boiler and a drum boiler, and the high-temperature flue gas passes through the waste heat boiler to transfer heat energy to the drum boiler, so that water in the drum boiler generates steam.
Optionally, in some embodiments of the present application, the waste heat recovery module includes a flue gas blower and a chimney, and the high-temperature flue gas passes through the waste heat boiler and then is discharged into the chimney through the flue gas blower.
Optionally, in some embodiments of the present application, the plant-wide combustible gas cascade utilization system further includes:
the detection device is used for detecting the pressure and the temperature of the gas in each module;
and the control valve is used for controlling the communication or the blockage of the pipelines among the modules.
Optionally, in some embodiments of the present application, the plant wide combustible gas cascade utilization system further comprises a control system connected to at least one of the flare module, the combustible gas recovery module, the waste gas incineration module, the detection device and the control valve for controlling operation of the system.
The beneficial effect of this application lies in:
the utility model provides a system is utilized to whole factory combustible gas cascade includes torch module, combustible gas recovery module, waste gas incineration module and waste heat recovery module, can carry out classification to the gas of different emission conditions, can retrieve high calorific value combustible gas simultaneously and store the utilization and handle with discharge to reaching standard with low calorific value waste gas, can also utilize the waste heat to produce steam and supply the whole factory to use.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cascade utilization system for combustible gas of a whole plant provided by an embodiment of the present application.
Description of reference numerals: 10-torch module, 20-combustible gas recovery module, 30-waste gas incineration module, 40-waste heat recovery module, 101-gas holder, 102-liquid separation tank, 103-water seal tank, 104-torch, 105-torch pilot lamp, 106-condensate collection tank, 107-compressor unit, 108-gas-liquid separation tank, 109-flame arrester, 110-incinerator pilot lamp, 111-incinerator burner, 112-incinerator hearth, 113-waste heat boiler, 114-steam drum, 115-combustion fan, 116-flue gas fan, 117-chimney, 201-first pressure detection device, 202-second pressure detection device, 203-third pressure detection device, 204-fourth pressure detection device, 205-fifth pressure detection device, 206-a sixth pressure detection device, 301-a first temperature detection device, 302-a second temperature detection device, 303-a third temperature detection device, 304-a fourth temperature detection device, 401-a first liquid level detection device, 402-a second liquid level detection device, 403-a third liquid level detection device, 404-a fourth liquid level detection device, 405-a fifth liquid level detection device, 501-a first control valve, 502-a second control valve, 503-a third control valve, 504-a fourth control valve, 505-a fifth control valve, 01-a combustible gas source, 02-a waste gas source, 03-an industrial water source, 04-a nitrogen source, 05-boiler feed water, 06-a steam pipe network, 601-a control system.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present application, are given by way of illustration and explanation only, and are not intended to limit the present application. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The embodiment of the application provides a combustible gas cascade utilization system of whole factory. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
The embodiment of the application provides a cascade utilization system for combustible gas of a whole plant, which comprises a torch module 10, a combustible gas recovery module 20, a waste gas incineration module 30 and a waste heat recovery module 40, as shown in fig. 1.
Further, as shown in fig. 1, the flare module 10 includes a separation tank 102, a water-sealed tank 103 and a flare 104, and is used for burning combustible gas at the flare 104 through the separation tank 102 and the water-sealed tank 103 in sequence. The combustible gas recovery module 20 is communicated with the liquid separation tank 102; the combustible gas recovery module 20 is connected to the combustible gas discharged from the liquid separation tank 102, and recovers the combustible gas. The waste gas incineration module 30 is communicated with the combustible gas recovery module 20 and is used for combusting the combustible gas from the combustible gas recovery module 20 to pyrolyze the waste gas so as to discharge the waste gas up to the standard. The waste heat recovery module 40 is connected to the exhaust gas incineration module 30, and is configured to absorb heat of the high temperature flue gas generated by the exhaust gas incineration module 30 and generate steam for use in the whole plant.
In some embodiments, as shown in FIG. 1, the torch module 10 includes a torch incandescent lamp 105 for providing a seed of fire to ignite the torch 104. The torch pilot light 105 is in communication with the combustible gas recovery module 20 for providing combustible gas to the torch pilot light 105.
In some embodiments, the water-sealed tank 103 has an air inlet therein, and the water-sealed pressure of the air inlet of the water-sealed tank 103 is 4.5-5.5 kpa. For example, the water seal pressure of the air inlet of the water-sealed tank 103 may be 4.5kpa, 4.6kpa, 4.7kpa, 4.8kpa, 4.9kpa, 5kpa, 5.1kpa, 5.2kpa, 5.3kpa, 5.4kpa, or 5.5kpa. Further, the water seal pressure of the air inlet is determined by the water seal height, for example, the water seal height H at the air inlet may be in a range of 450mm to 550mm, and correspondingly, the water seal pressure of the water seal height H is in a range of 4.5 to 5.5kpa. The water seal height H may be 450mm, 460mm, 470mm, 480mm, 490mm, 500mm, 510mm, 520mm, 530mm, 540mm or 550mm. For example, when the water seal height H is 450mm, the corresponding water seal pressure is about 4.5kpa; when the water seal height H is 500mm, the corresponding water seal pressure is about 5kpa; when the water seal height H is 550mm, the corresponding water seal pressure is about 5.5kpa; and so on by this principle.
Conceivably, when the pressure of the combustible gas at the gas inlet of the water-sealed tank 103 is greater than the water-sealed pressure, the combustible gas can break through the resistance of the water-sealed height and be discharged into the torch 104, and the combustible gas is combusted, decompressed and discharged. Conceivably, the water sealing function of the water-sealed tank 103 enables the combustible gas to be automatically adjusted in different module treatments according to the pressure of the combustible gas, so that the recycling of the combustible gas is improved, and meanwhile, the safety is improved.
In some embodiments, as shown in fig. 1, the combustible gas recovery module 20 includes a gas cabinet 101, a compressor train 107, and a gas-liquid separation tank 108. Wherein, the inlet of the gas holder 101 is communicated with the liquid separating tank 102, and the gas outlet of the gas holder 101 is communicated with the compressor unit 107 and the gas-liquid separating tank 108. The compressor unit 107 is located between the gas holder 101 and the gas-liquid separation tank 108, and is used for compressing the combustible gas entering the gas-liquid separation tank 108. It is conceivable that the combustible gas first enters the gas holder 101 of the combustible gas recovery module 20.
Further, the knockout pot 102 has an inlet, a first outlet, and a second outlet. Wherein, the import of knockout drum 102 communicates with combustible gas source 01, and combustible gas source 01 provides combustible gas to knockout drum 102. The first pressure detection device 201 is arranged on a pipeline between the combustible gas source 01 and the liquid separation tank 102 and can detect the pressure of the combustible gas. A first outlet of the separation tank 102 communicates with a water seal tank 103. The second outlet of the liquid separation tank 102 is communicated with the gas holder 101, and a first control valve 501 is arranged between the second outlet and the gas holder 101 and used for controlling the pipeline communication between the liquid separation tank 102 and the gas holder 101. The embodiment of the present application may control the opening and closing of the first control valve 501 according to the pressure and temperature in the gas holder 101.
In this application embodiment, combustible gas source provides combustible gas for separating the jar and is high calorific value combustible gas. The high calorific value gas means that the calorific value of the combustible gas is more than 7880KJ/Nm 3 (ii) a The combustible gas component mainly comprises combustible hydrocarbon gas such as alkane, alkene and the like. In this application, combustible gas passes through the gas holder recovery processing of the system of this application, and combustible gas's recycle ratio can reach 99%.
Further, the water-sealed tank 103 has a liquid inlet and a liquid outlet, wherein the liquid inlet is communicated with the industrial water source 03, and the liquid outlet is communicated with the sewage pipeline. The water sealed tank 103 is connected to a third liquid level detection device 403 for detecting the liquid level in the water sealed tank 103. When the sewage needs to be discharged from the water-sealed tank 103 or the liquid level needs to be lowered, the liquid outlet of the water-sealed tank 103 can be controlled to open and discharge the sewage inside. When the liquid level of the water-sealed tank 103 is lower than the liquid level required to be supplemented, the industrial water source 03 can be controlled to supplement industrial water to the water-sealed tank 103. Furthermore, a fifth control valve 505 is arranged between the industrial water source 03 and the liquid inlet of the water-sealed tank 103.
Further, the water sealed tank 103 is also communicated with a nitrogen source 04, and a third control valve 503 is arranged on a pipeline between the water sealed tank 103 and the nitrogen source 04. The nitrogen source 04 provides low-pressure nitrogen for the system, and the system can be protected after the low-pressure nitrogen is introduced into the water-sealed tank 103. It is conceivable that the low-pressure nitrogen gas is an inert gas, and the calorific value of the combustible gas in the water sealed tank 103 can be reduced.
Further, the water sealed tank 103 has an outlet port, which is communicated with the torch 104. Combustible gas that breaks the water seal pressure of the water seal tank 103 is discharged into a flare 104 for combustion. Conceivably, in the accident state, a large amount of combustible gas can be discharged into the torch 104 for combustion in time, thereby ensuring the safe production of a factory and reducing the environmental pollution. Meanwhile, the risk of explosion caused by the fact that a large amount of combustible gas enters the gas cabinet 101 in a short time can be avoided. However, under normal conditions, the pressure of the combustible gas is low, and most of the combustible gas enters the gas holder 101 for recycling.
Further, the gas holder 101 is provided with a second pressure detection device 202 capable of detecting the pressure inside the gas holder 101. The gas holder 101 is provided with a first temperature detection device 301 capable of detecting the temperature inside the gas holder 101. The liquid outlet of the gas holder 101 is communicated with a condensate collecting tank 106. The gas holder 101 is provided with a first liquid level detection device 401, which can detect the liquid level in the gas holder 101, and when the liquid level reaches a certain position, the liquid in the gas holder 101 can be controlled to be transferred into the condensate collecting tank 106. It is envisioned that the liquid outlet of the gas cabinet 101 is located at the bottom to facilitate liquid drainage.
Further, a pipeline between the gas holder 101 and the compressor unit 107 is communicated with the nitrogen source 04 through a second control valve 502. The nitrogen source 04 provides low-pressure nitrogen for the system, and the low-pressure nitrogen is introduced into the gas holder 101 to protect the system.
Further, the compressor train 107 includes a first compressor and a second compressor. One for use at start-up and one for standby. Further, the first compressor has a first gas port that can be used as both a gas inlet and a gas outlet, and a second gas port that can be used as both a gas inlet and a gas outlet. It is envisioned that the second compressor is identical to the first compressor, having a first gas port and a second gas port.
Further, the gas-liquid separation tank 108 has a gas inlet, a liquid outlet, and a gas outlet. It is envisioned that the liquid outlet is located at the bottom of the knock-out pot 108 to facilitate the discharge of liquid from the knock-out pot 108; the gas outlet is located at the top of the gas-liquid separation tank 108, so that the separated gas can be discharged out of the gas-liquid separation tank 108. The gas inlet is located between the liquid outlet and the gas outlet, and the lower part of the gas-liquid separation tank 108 is provided to facilitate sufficient gas-liquid separation.
Specifically, the gas box 101 communicates with a first gas port of the first compressor and a first gas port of the second compressor, respectively. The second gas port of the first compressor and the second gas port of the second compressor are respectively communicated with a gas inlet of the gas-liquid separation tank 108. The first gas port of the first compressor and the first gas port of the second compressor are communicated with each other through a pipeline, and the second gas port of the first compressor and the second gas port of the second compressor are communicated with each other through a pipeline. Therefore, the operation of the compressor unit 107 can be guaranteed, and the influence on the overall operation of the system due to the fault of a single compressor is avoided.
In some embodiments, the fuel gas recovery module 20 further includes a condensate collection tank 106. The condensate collecting tank 106 is respectively communicated with the gas holder 101 and the gas-liquid separation tank 108 and is used for collecting liquid in the gas holder 101 and the gas-liquid separation tank 108.
Further, the gas-liquid separation tank 108 and the second temperature detection device 302 can detect the temperature in the gas-liquid separation tank 108. The pressure in the gas-liquid separation tank 108 can be monitored in real time by the gas-liquid separation tank 108 and the third pressure detection device 203. The gas-liquid separation tank 108 is connected to the fourth liquid level detection device 404, which can monitor the liquid level in the gas-liquid separation tank 108 in real time, and when the liquid level reaches a certain height, can control the liquid to be transferred into the condensate collection tank 106. Furthermore, the condensate collection tank 106 is connected to a fifth liquid level detection device 405 for detecting the liquid level in the condensate collection tank 106 to obtain the liquid level or volume in the condensate collection tank 106.
In the embodiment of the application, if the pressure of the combustible gas is greater than that of the water-sealed tank 103, the combustible gas enters the torch 104 to continue burning, pressure relief and discharge. If the pressure of the combustible gas is less than the water sealed tank 103, the combustible gas enters the combustible gas recovery module 20.
In some embodiments, as shown in fig. 1, the exhaust gas incineration module 30 includes an incinerator pilot 110, an incinerator burner 111, and an incinerator furnace 112.
Further, the burner pilot lamp 110 is communicated with the gas-liquid separation tank 108 in the combustible gas recovery module 20, and the gas-liquid separation tank 108 supplies continuous combustible gas to the burner pilot lamp 110. A fourth pressure detection device 204 is further arranged between the incinerator pilot burner 110 and the gas-liquid separation tank 108 and used for detecting the pressure of combustible gas in the pipeline.
Further, the incinerator pilot 110 is used to supply a flame species to the incinerator burner 111. The incinerator burner 111 communicates with the gas-liquid separation tank 108, and it can be seen that the gas-liquid separation tank 108 supplies combustible gas to the incinerator burner 111. A fourth control valve 504 is provided on a pipe between the incinerator burner 111 and the gas-liquid separation tank 108, and controls opening and closing of a pipe through which the combustible gas is introduced to the incinerator burner 111 and the incinerator furnace 112.
Further, the combustible gas discharged from the combustible gas recovery module 20 enters the incinerator hearth 112 through the incinerator burner 111 to be combusted, so as to pyrolyze the waste gas in the incinerator hearth 112. Burn burning furnace 112 and link to each other with third temperature-detecting device 303, and third temperature-detecting device 303 is used for detecting the temperature of burning furnace 112, and if the temperature is low excessively, the accessible control fourth control flap 504 improves the proportion of combustible gas and waste gas, and then improves combustion temperature, is convenient for carry out the pyrolysis to waste gas.
Further, the waste gas incineration module 30 includes a combustion fan 115, the combustion fan 115 is communicated with the incinerator burner 111 and the incinerator hearth 112, and the combustion fan 115 can provide air to facilitate the combustion of the incinerator burner 111 and the incinerator hearth 112.
Further, the waste gas incineration module 30 further comprises a waste gas source 02, wherein the waste gas source 02 is communicated with the incinerator hearth 112, and waste gas is introduced into the incinerator hearth 112. The exhaust gas incineration module 30 further comprises a flame arrester 109, through which flame arrester 109 the exhaust gas enters the incinerator furnace 112. It is envisioned that a flame arrestor 109 is positioned between the source of exhaust gas 02 and the incinerator furnace 112 to prevent the source of fire from affecting the source of exhaust gas 02.
In the embodiment of the present application, the waste gas introduced into the communication of the incinerator furnace 112 may be low calorific value combustible gas or low calorific value waste gas. The low heat value combustible gas or low heat value waste gas means that the heat value of the combustible gas is less than 7880KJ/Nm 3 . Further, the components of the low heating value exhaust gas include inert non-combustible gases and combustible hydrocarbons. About 90% or more of the components of the low-heating-value exhaust gas are inert non-combustible gases (such as nitrogen or air); and the proportion of combustible hydrocarbon gas components is less than 10 percent. In the present application, the non-methane total hydrocarbon content of the waste gas after pyrolysis by the system of the present application is less than or equal to 80mg/Nm 3 Meets the environmental protection standard and discharges.
In some embodiments, the temperature of the incinerator furnace 112 is maintained in the range of 800 ℃ to 1200 ℃ for pyrolysis of the flue gas to meet emission standards. The embodiment of the application can realize the combustion temperature by the content ratio of the combustible gas and the waste gas introduced into the hearth 112 of the incinerator, realize pyrolysis of the waste gas and enable the waste gas to reach the emission standard. For example, the temperature of the incinerator furnace 112 may be 800 ℃, 850 ℃, 900 ℃, 950 ℃, 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃ or 1200 ℃. Specifically, when it is detected that the temperature of the incinerator furnace 112 is too low, the temperature can be increased by increasing the content of the combustible gas introduced. When the temperature of the incinerator furnace 112 is detected to be too high, the temperature can be reduced by reducing the content of the introduced combustible gas.
In some embodiments, as shown in FIG. 1, the heat recovery module 40 includes a heat recovery boiler 113 and a drum boiler 114. The high-temperature flue gas in the incinerator hearth 112 passes through the waste heat boiler 113 to transfer heat energy to the drum boiler 114, so that water in the drum boiler 114 is generated into steam.
Further, the drum boiler 114 is connected to the steam pipe network 06, and the steam generated by the drum boiler 114 can be supplied to the whole plant through the steam pipe network 06.
Further, a fifth pressure detection device 205 and a fourth temperature detection device 304 are arranged on a pipeline between the steam pipe network 06 and the drum boiler 114, wherein the fifth pressure detection device 205 is used for detecting the pressure of the steam, and the fourth temperature detection device 304 is used for detecting the temperature of the steam.
Further, a boiler feedwater source 05 is connected to the drum boiler 114 for providing water into the drum boiler 114.
In some embodiments, as shown in fig. 1, the waste heat recovery module 40 further includes a flue gas blower 116 and a stack 117. The high-temperature flue gas is exhausted into a chimney 117 through a flue gas fan 116 after the waste heat is utilized by the waste heat boiler 113. At this time, the gas discharged from the chimney 117 reaches the emission standard, and meets the national energy-saving and emission-reduction requirements.
In the embodiment of the application, the cascade utilization system of the combustible gas in the whole plant comprises a plurality of detection devices for detecting the pressure and the temperature of the gas in each module. Further, the detection means includes pressure detection means and temperature detection means. In the embodiment of the application, the cascade utilization system of the combustible gas in the whole plant comprises a plurality of control valves for controlling the communication or the blockage of the pipelines among the modules.
In some embodiments, the plant-wide combustible gas cascade utilization system further includes a control system 601, the control system 601 being connected to at least one of the flare module 10, the combustible gas recovery module 20, the waste gas incineration module 30, the detection device, and the control valve for controlling operation of the system.
The combustible gas cascade utilization system of the whole plant can classify and process the gas under different emission conditions of the whole plant. Specifically, the combustible gas cascade utilization system of whole factory of this application embodiment can retrieve high calorific value combustible gas simultaneously and store the utilization and handle low calorific value waste gas and discharge in order to reach standard, can also utilize waste heat production steam to supply the whole factory to use.
To the complicated calorific value height of combustible gas composition and flow fluctuation range big among the modern chemical industry device, the system of this application can effectively decompose low heat value waste gas to but the high calorific value combustible gas of recoverable storage whole factory guarantees its qualified steam of output for exhaust-heat boiler provides lasting fuel gas, provides fuel gas for the pilot burner lamp simultaneously for burning module and torch module, reaches energy-conserving purpose. In addition, in case of accident, a great deal of combustible gas can be discharged into the torch for combustion, thereby ensuring the safe production of factories and reducing the environmental pollution.
The embodiment of the application also provides classification treatment of gas under different emission conditions in a whole plant, and the whole plant combustible gas cascade utilization system is adopted.
The utility model provides a cascade utilization system of combustible gas of whole factory is applicable to the cascade utilization method of the combustible gas emission of whole factory nature, can carry out classification to the combustible gas that the whole factory discharge condition is different, and the high calorific value combustible gas is retrieved as far as possible and is stored the utilization when discharging, and low calorific value waste gas burns emission up to standard, and the automatic torch module of discharging carries out the safe combustion emission of going into when the big discharge capacity of emergency accident.
The cascade utilization method for the combustible gas emission of the whole plant is realized by adopting the system, and the method is specifically shown as follows.
High-calorific-value combustible gas discharged by the combustible gas source 01 in normal production is discharged, and the combustible gas is discharged into the gas holder 101 for combustible gas recovery after being separated by the liquid separation tank 102.
The gas holder 101 is provided with a second pressure detection device 202, a first temperature detection device 301 and a first liquid level detection device 401 for monitoring, when overpressure, overtemperature or overhigh liquid level of the gas holder occurs, the first control valve 501 is closed, and combustible gas is discharged into the torch 104 for combustion, pressure relief and discharge.
When the whole plant accident is in a working condition, a large amount of high-heat-value combustible gas of the combustible gas source 01 is discharged, the pressure is detected by the first pressure detection device 201 to exceed 4.5-5.5 kpa, the first control valve 501 is closed, the combustible gas enters the water seal tank 103 through the liquid separation tank 102 and breaks through the water seal resistance of the water seal height H, and the combustible gas is discharged into the torch 104 to be combusted, decompressed and discharged. Wherein the water seal height H of the water seal tank 103 is maintained by controlling the switch of the shut valve 505 by the third liquid level detection device 403 to replenish industrial water.
The gas holder 101 stores a certain amount of high calorific value combustible gas under the normal condition, through compressor unit 107, through gas-liquid separation jar 108 liquid separation, the pressurization is discharged into the combustible gas pipe network and is divided into three routes: wherein, the first two paths are respectively a torch pilot lamp 105 and an incinerator pilot lamp 110 which pass through a pressure regulating valve and supply continuous fuel gas for the two pilot lamps; the third path is sent to the incinerator burner 111 through the fourth control valve 504, and combustible gas for adjusting heat value is provided for the waste gas incineration module, so that the combustion temperature of the incinerator hearth 112 and the high-temperature flue gas of the waste heat boiler 113 can be guaranteed.
The compressor unit 107 is provided with two compressors, and generally, one compressor is started for use, and the other compressor is reserved; a backflow communicating pipeline is arranged between the air outlet of the compressor unit 107 and the air cabinet, so that the stable operation of the compressor unit 107 is ensured. The condensate of the gas-liquid separation tank 108 and the condensate of the gas holder 101 are collected and discharged to the condensate collection tank 106 for temporary storage, and the condensate is delivered after reaching a certain liquid level according to the indication of the fifth liquid level detection device 405.
The low-heat value waste gas discharged by the waste gas source 02 is discharged into an incinerator hearth 112 through a flame arrester 109, and the low-heat value waste gas is pyrolyzed by means of the high temperature (800-1200 ℃) of the incinerator hearth 112; after combustion, the high-temperature flue gas is subjected to waste heat utilization through a waste heat boiler 113, then is discharged into a chimney 117 through an induced draft fan 116, and is discharged after reaching the standard. Wherein the oxygen required for combustion is supplied to the combustion of the incinerator burner 111 and the incinerator furnace 112 by means of the combustion fan 115.
When the discharge fluctuation of the low-calorific-value waste gas is large, the third temperature detection device 303 detects that the temperature of the hearth 112 of the incinerator is low or the steam pressure of the fifth pressure detection device 205 and the temperature of the fourth temperature detection device 304 do not reach the standard, the fourth control valve 504 is opened to supplement enough high-calorific-value combustible gas. After combustion, the high-temperature flue gas generates qualified steam through the waste heat boiler 113 and the qualified steam is sent to the steam pipe network 06 of the whole plant for the application of the whole plant.
In addition, the whole system is provided with a nitrogen source 04 for providing low-pressure nitrogen for the system; according to the pressure and temperature detection, low-pressure nitrogen is respectively introduced into the gas holder 101 and the water seal tank 103 by cutting off the second control valve 502/the third control valve 503, so that the system is protected.
The system of this application can handle and utilize high calorific value combustible gas and low calorific value waste gas simultaneously. The high-calorific-value combustible gas discharged in normal production is recovered through the gas holder of the system. The pyrolysis of low heat value waste gas is realized through doping burning with remaining part high heat value combustible gas and low heat value waste gas to this application system to and the effect of the heat of follow-up recovery pyrolysis burning. Therefore, cascade utilization of combustible gas of the whole plant can be realized through the system, and the utilization efficiency is high.
The system has the following specific effects:
the high heating value combustible gas that normal production was discharged is retrieved through the gas holder of this application system, and this high heating value combustible gas's recycle ratio can reach 99%.
Through the system, the low-heat-value waste gas is subjected to pyrolysis treatment, and the pyrolyzed low-heat-value waste gas meets the relevant requirements of special emission limit values of petrochemical industry pollutant emission standard GB 31571-2015. Wherein the total hydrocarbon of non-methane is less than or equal to 80mg/m 3 。
Through the system, the heat generated in the pyrolysis process of the low-heat-value waste gas can be recycled. Specifically, the heat recovered by the waste heat boiler can generate the following qualified steam parameters for the whole plant application, the waste heat recovery sends out saturated steam, and the steam temperature is more than or equal to 193 ℃; the waste heat recovery sends out 1.25MPa of steam pressure, and the cylinder is divided to send out 0.5MPa of steam pressure.
To sum up, after the combustible gas of high calorific value got into the system, the unable breach torch module water seal of water sealed tank water seal of low pressure low discharge gas enters into the gas holder and carries out combustible gas and retrieve, and the combustible gas that the gas holder was stored passes through the compressor pressure boost after, gives the fuel gas of burning furnace high calorific value respectively, supplies the fuel gas for burning furnace pilot burner and torch pilot burner simultaneously. The incinerator is mainly used for treating low-heat-value waste gas discharged by a whole plant, the high-heat-value combustible gas recovered is utilized for mixed combustion adjustment, the temperature of the hearth is improved, pyrolysis of the waste gas is guaranteed to be discharged up to standard, and qualified steam is produced. When an accident occurs in the whole plant, a large amount of combustible gas is discharged instantly, the gas inlet valve of the gas holder is closed at the moment, the torch gas breaks through the water seal of the water-sealed tank, and the gas is discharged into a torch to be safely combusted and discharged.
The utility model provides a combustible gas cascade utilization system of whole factory can carry out classification to the gas of different emission conditions effectively, retrieves to store and utilizes high calorific value combustible gas, and discharge low calorific value waste gas up to standard to and utilize the waste heat to produce steam and supply the whole factory to use, realized energy-conserving purpose, and guaranteed factory safety in production, reduce environmental pollution.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The embodiment of the present application provides a cascade utilization system of combustible gas from a whole plant, and a specific example is applied in the specification to explain the principle and the implementation of the present application, and the description of the embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (12)
1. A cascade utilization system for combustible gas of a whole plant is characterized by comprising:
the torch module (10) comprises a liquid separation tank (102), a water seal tank (103) and a torch (104), and is used for enabling combustible gas to sequentially pass through the liquid separation tank (102) and the water seal tank (103) to be combusted at the torch (104);
a combustible gas recovery module (20), the combustible gas recovery module (20) being in communication with the liquid separation tank (102); the combustible gas recovery module (20) is connected to the combustible gas discharged from the liquid separation tank (102) and recovers the combustible gas;
the waste gas incineration module (30) is communicated with the combustible gas recovery module (20) and is used for combusting the combustible gas from the combustible gas recovery module (20) to carry out pyrolysis on the waste gas so as to enable the waste gas to reach the standard and be discharged;
the waste heat recovery module (40), waste heat recovery module (40) with waste gas burns module (30) and is connected for absorb the heat of the high temperature flue gas that waste gas burns module (30) production and produce steam.
2. The cascade utilization system for combustible gas of whole plant according to claim 1, wherein if the pressure of the combustible gas is higher than that of the water-sealed tank (103), the combustible gas enters the flare (104) to continue burning, decompressing and discharging;
and if the pressure of the combustible gas is less than that of the water-sealed tank (103), the combustible gas enters the combustible gas recovery module (20).
3. The cascade utilization system for combustible gas of whole plant according to claim 2, characterized in that the water-sealed tank (103) is provided with an air inlet, and the water-sealed pressure of the air inlet is in the range of 4.5-5.5 kpa.
4. The plant-wide combustible gas cascade utilization system of claim 1, wherein the flare module (10) includes a flare pilot light (105) for providing a fire seed to ignite the flare (104);
the torch incandescent lamp (105) is in communication with the combustible gas recovery module (20) for providing combustible gas to the torch incandescent lamp (105).
5. The plant-wide combustible gas cascade utilization system of claim 1, wherein the combustible gas recovery module (20) comprises a gas cabinet (101), a compressor train (107) and a gas-liquid separation tank (108); wherein the inlet of the gas holder (101) is communicated with the liquid separation tank (102), and the gas outlet of the gas holder (101) is communicated with the compressor unit (107) and the gas-liquid separation tank (108); the compressor unit (107) is located between the gas holder (101) and the gas-liquid separation tank (108) and is used for compressing the combustible gas entering the gas-liquid separation tank (108).
6. The plant-wide combustible gas cascade utilization system of claim 1, wherein the waste gas incineration module (30) comprises:
the incinerator beacon light (110), the incinerator beacon light (110) is communicated with the combustible gas recovery module (20) and is used for providing combustible gas for the incinerator beacon light (110);
an incinerator burner (111), the incinerator beacon light (110) for providing a flame species to the incinerator burner (111);
and the combustible gas discharged by the combustible gas recovery module (20) enters the incinerator hearth (112) through the incinerator burner (111) to be combusted, and is used for pyrolyzing the waste gas in the incinerator hearth (112).
7. The plant-wide combustible gas cascade utilization system of claim 6, wherein the exhaust gas incineration module (30) comprises a flame arrester (109), the exhaust gas passing through the flame arrester (109) into the incinerator furnace (112).
8. The cascade utilization system for combustible gas throughout the plant of claim 6, wherein the temperature of the incinerator furnace (112) is 800 ℃ to 1200 ℃ for pyrolysis of the flue gas to meet emission standards.
9. The cascade utilization system for combustible gas of a whole plant according to claim 1, wherein the waste heat recovery module (40) comprises a waste heat boiler (113) and a drum boiler (114), and the high temperature flue gas passes through the waste heat boiler (113) to transfer heat energy to the drum boiler (114) so that water in the drum boiler (114) is generated into steam.
10. The cascade utilization system for combustible gas of a whole plant according to claim 9, wherein the waste heat recovery module (40) comprises a flue gas fan (116) and a chimney (117), and the high temperature flue gas passes through the waste heat boiler (113) and then is discharged into the chimney (117) through the flue gas fan (116).
11. The plant-wide combustible gas cascade utilization system of claim 1, further comprising:
the detection device is used for detecting the pressure and the temperature of the gas in each module;
and the control valve is used for controlling the communication or the blockage of the pipelines among the modules.
12. The plant combustible gas cascade utilization system of claim 11, further comprising a control system (601), the control system (601) being connected with at least one of the flare module (10), the combustible gas recovery module (20), the waste gas incineration module (30), the detection device, and the control valve for controlling operation of the system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211466657.8A CN115854364A (en) | 2022-11-22 | 2022-11-22 | Combustible gas cascade utilization system of whole plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211466657.8A CN115854364A (en) | 2022-11-22 | 2022-11-22 | Combustible gas cascade utilization system of whole plant |
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| CN202211466657.8A Pending CN115854364A (en) | 2022-11-22 | 2022-11-22 | Combustible gas cascade utilization system of whole plant |
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