CN115259158A - System and method for preparing high-reduction-potential gas by calcium carbide liquid forming coupling - Google Patents
System and method for preparing high-reduction-potential gas by calcium carbide liquid forming coupling Download PDFInfo
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Abstract
The invention provides a system and a method for preparing high reduction potential gas by calcium carbide liquid molding coupling, wherein the system comprises: the gas mixing and preheating device is used for preheating the mixed raw material gas, and simultaneously sending the preheated reduction potential gas to the calcium carbide liquid cooling and reforming device in a compression blowing and scavenging manner; the calcium carbide liquid cooling and reforming device is used for cooling the molten calcium carbide liquid and simultaneously preparing high reduction potential gas by preheating the mixed gas and reforming; the calcium carbide particle collecting device is used for collecting the cooled and reformed calcium carbide particles; the reducing gas collecting device is used for collecting the high reducing potential gas; the state monitoring and controlling device is used for collecting and monitoring state data in the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of waste heat utilization, in particular to a system and a method for preparing high-reduction potential gas by calcium carbide liquid forming coupling.
[ background of the invention ]
The calcium carbide production process comprises an electric heating method, a rotary arc furnace method, an oxygen heating method, an electric heating-oxygen heating coupling method, a plasma method, a catalytic method and the like, but the traditional electric heating reduction method is still the most mature calcium carbide production method at present. The process is that the lime hydrate (CaO) and the coke/semicoke (C) are reacted in a submerged arc type calcium carbide furnace at the high temperature of 1800-2200 ℃, and the byproduct carbon monoxide is generated at the same time. And discharging the smelted calcium carbide product from a furnace mouth every other one hour or so, enabling the molten calcium carbide to flow into a calcium carbide pot on a traction trolley, conveying the calcium carbide pot in a hot pot pre-cooling area through a winch, a bridge crane and other conveying equipment, cooling for two hours, lifting the calcium carbide weight out of the pot, and placing the calcium carbide weight in the cooling area for continuous cooling. The traditional cooling modes of the high-temperature calcium carbide at present comprise natural cooling, air cooling and the like, and the modes cool the temperature of the calcium carbide from 2000 ℃ to 80 ℃, so that sensible heat accounting for about 30% of total energy consumption is directly dissipated, and serious heat energy waste is caused; meanwhile, the heat energy is emitted to a workshop, so that the production environment is polluted, the temperature of the working environment is increased, and the body of a production worker is greatly injured.
At present, domestic data on calcium carbide heat recovery are basically blank, related documents are few, and a series of patents are concentrated after 2014. Chinese patent CN105066715B provides a heat collecting device for calcium carbide cooling process waste heat recovery, and the scheme of adopting tunnel kiln heat recovery technical route needs to add a tunnel kiln, and when the calcium carbide pot is placed in the tunnel kiln, heat is exchanged. Chinese patent CN109084588B provides a system of going out of furnace for calcium carbide sensible heat power generation, including delivery track, group of car of going out of furnace group, moving platform, manipulator, traction track, tractor, hoist and tunnel cave, can realize that the continuous transportation of calcium carbide pot is placed in the tunnel cave and is unloaded and shift out, reduces the heat loss of calcium carbide transportation process. The above devices all have a prominent problem that the high-temperature molten calcium carbide is exposed in the air to be cooled, and N in the air2And O2Reacts with the thermal calcium carbide to generate calcium cyanamide and calcium oxide, thus reducing the quality of the calcium carbide product. Patent CN106276905B discloses a method for granulating molten calcium carbide, in which the cooling gas used in the granulating process is neon or argon or other inert gas, so as to recover heat on one hand, and on the other hand, the granulated calcium carbide does not need to be crushed again. However, this method uses neon or argon as a heat exchange gas, the gas cost is high,is not beneficial to reducing the production cost of enterprises. Patent CN104792184A provides a system and a method for recovering waste heat of molten state calcium carbide by adopting N2Or CO2The method comprises the steps of cooling the hot calcium carbide in a calcium carbide forming chain and a cooling chain, and then heating steam by using high-temperature gas to generate power, wherein the calcium carbide in the method is cooled in a bulk solid mode, so that the cooling rate is difficult to ensure, the energy loss is large in the process of high-temperature gas heat energy → hot steam → electric energy, and the system runs at certain risk due to the existence of water.
With the improvement of the level of process equipment, the degree of automation and the level of safety and environmental protection in calcium carbide production, the reduction of energy consumption and the development of new clean processes in recent years, the capacity of calcium carbide is rapidly increased, and the problem of huge sensible heat energy loss brought with the capacity is increasingly highlighted. The method develops the technology and equipment for efficiently recovering waste heat and safely cleaning the high-added-value product prepared by low energy consumption in the discharging process of the molten calcium carbide, and becomes a necessary choice for completing the tasks of energy conservation, consumption reduction, safety and environmental protection and realizing sustainable development in the calcium carbide industry. Meanwhile, the resource characteristics of rich coal, oil and gas in China restrict the development of a plurality of industries, and if the waste heat recovery of the calcium carbide industry and the reducing gas preparation technology can be organically integrated, the method has positive effects on relieving the development of industrial enterprises restricted by reducing gas resources and promoting the realization of the double-carbon target in China. Therefore, a system and a method for preparing high reduction potential gas by calcium carbide liquid molding coupling, which are safe, stable, low in operation cost, good in cooling efficiency, compact in structure and simple and convenient to operate, are urgently needed.
Therefore, there is a need to develop a system and a method for preparing high-reduction potential gas by carbide liquid forming coupling to overcome the deficiencies of the prior art, so as to solve or alleviate one or more of the above problems.
[ summary of the invention ]
In view of the above, the invention provides a system and a method for preparing high-reduction potential gas by calcium carbide liquid molding coupling, which not only utilize the sensible heat of calcium carbide, but also increase the additional value of calcium carbide products and reduce the production cost of enterprises.
In one aspect, the present invention provides a system for preparing a high reduction potential gas by shaping and coupling calcium carbide liquid, the system comprising:
the gas mixing and preheating device is used for preheating the mixed gas, and simultaneously sending the preheated mixed gas to the calcium carbide liquid cooling and reforming device in a compression blowing and scavenging manner;
the calcium carbide liquid cooling and reforming device is used for cooling and reforming the molten calcium carbide liquid and preparing the preheated mixed gas into high-reduction potential gas;
the calcium carbide particle collecting device is used for collecting the cooled and reformed calcium carbide particles;
the reducing gas collecting device is used for collecting the high reducing potential gas;
the state monitoring and controlling device is used for collecting and monitoring state data in the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device;
gas mixing preheating device and carbide liquid cooling and reforming unit meet, and carbide granule collection device sets up in carbide liquid cooling and reforming unit below and extends to carbide liquid cooling and reforming unit inside, and carbide liquid cooling and reforming unit's gas outlet and reducing gas collection device are connected, and gas mixing preheating device, carbide liquid cooling and reforming unit, carbide granule collection device and reducing gas collection device are connected simultaneously to state monitoring regulation and control device.
The above aspects and any possible implementation manners further provide an implementation manner, wherein the gas mixing preheating device comprises a gas mixing preheating zone, a compression injection unit and a scavenging unit, and the gas mixing preheating zone is simultaneously communicated with the calcium carbide liquid cooling and reforming device through the compression injection unit and the scavenging unit, wherein;
the compression and injection unit is communicated with a calcium carbide liquid inlet in the calcium carbide liquid cooling and reforming device and is used for injecting molten calcium carbide liquid to obtain high-temperature calcium carbide particles;
the blowing gas unit is communicated with the bottom of the calcium carbide liquid cooling and reforming device and is used for forming an air film on the wall surfaces of the calcium carbide particles and the cooling rotary kiln so as to prevent the calcium carbide particles from being bonded with the wall surfaces.
The above-mentioned aspects and any possible implementation manners further provide an implementation manner, wherein the gas mixing preheating device further includes a plurality of gas transmission channels and a first sensor, the plurality of gas transmission channels are connected to the compression blowing unit and the blowing and sweeping unit through the gas mixing preheating zone, a flow meter is disposed between each gas transmission channel and the gas mixing preheating zone, the first sensor is disposed in the gas mixing preheating zone, and the first sensor and the flow meter are connected to the state monitoring and control device.
The calcium carbide liquid cooling and reforming device comprises a calcium carbide liquid tundish, a calcium carbide liquid inlet, a cooling rotary kiln, a transmission base and a large gear ring, wherein the transmission base can rotate through the large gear ring to cool the rotary kiln, the calcium carbide liquid tundish is simultaneously connected with the cooling rotary kiln and a compression injection unit through the calcium carbide liquid inlet, and the transmission base is connected with a state monitoring and control device.
As above-mentioned aspect and any possible implementation further provide an implementation, the inside guide screw that is provided with of cooling rotary kiln, the cooling rotary kiln includes rotary kiln entry end and rotary kiln exit end, carbide liquid entry, compression jetting unit and sweep gas unit are connected simultaneously to the rotary kiln entry end, and the rotary kiln exit end is connected reducing gas collection device and carbide granule collection device simultaneously.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the calcium carbide liquid cooling and reforming device further comprises a thermal infrared imager, and the thermal infrared imager is arranged at the outlet end of the rotary kiln.
The above aspects and any possible implementation manner further provide an implementation manner, where the reducing gas collecting device includes a dust remover, a second sensor, a storage channel, and an application channel, where one end of the dust remover is communicated with the outlet end of the rotary kiln, and the other end of the dust remover is simultaneously communicated with the storage channel and the application channel, and the second sensors are disposed in the middles of the connection between the storage channel and the dust remover, and connected to the state monitoring and control device.
The above aspect and any possible implementation manner further provide a method for preparing high-reduction-potential gas by calcium carbide liquid forming coupling, which is implemented by the system, and the method includes the following steps:
s1, cooling gas mixing and preheating: uniformly mixing and preheating raw material gas to 100-130 ℃ in a gas mixture preheating zone, then dividing the raw material gas into two paths to enter a calcium carbide liquid cooling and reforming device, wherein one path enters through a compression blowing device in a pressurized blowing manner, and the other path enters through a blowing gas channel;
s2, cooling the calcium carbide and preparing reducing gas: the calcium carbide liquid discharged from the calcium carbide furnace is sealed and insulated in a calcium carbide liquid tundish, and calcium carbide particles are formed by spraying and blowing after being discharged from a calcium carbide liquid outlet and fall into a cooling rotary kiln; calcium carbide particles are conveyed to the tail end of the rotary kiln through guide threads, and when the calcium carbide particles are cooled to be below 200 ℃, the calcium carbide particles are discharged and fall into a calcium carbide particle collecting device for screening and collecting; preheating the mixed gas to perform heat exchange with calcium carbide particles, raising the temperature of the mixed gas to perform a reforming reaction, accelerating the temperature reduction of the calcium carbide particles through the strongly endothermic reforming reaction, simultaneously generating high reduction potential gas, and collecting or applying the high reduction potential gas after dust removal through a dust remover;
s3, automatic adjustment control: the state monitoring and control device monitors the flow of the raw material gas, the temperature and component information of the preheated mixed gas, the components and temperature and pressure information of the high-reduction potential gas and the temperature and motion state information of the calcium carbide particles, and simultaneously transmits the information to the control computer PLC for calculation and identification and gives specific control.
The above aspects and any possible implementation further provide an implementation that the raw gas in S1 includes a proportion of rich CH4Gas and rich CO2Gas, rich in CH4The gas is natural gas, coke oven gas or coal bed gas, and is rich in CO2CO in gas2Is not less than 25%, and CH in the mixed gas4With CO21 to 1.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the high reduction potential gas in S2 comprises CO、H2And CO2And CO and H2Is not less than 90% and H2The ratio to CO is 1.
Compared with the prior art, the invention can obtain the following technical effects:
(1) In the calcium carbide liquid cooling and reforming device, the molten calcium carbide is injected into particles, the heat transfer rate of the calcium carbide and the mixed gas is greatly enhanced, the crushing link of the original calcium carbide production is omitted, and the calcium carbide liquid cooling and reforming device is of great benefit for reducing the production cost.
(2) The preheated mixed gas and the calcium carbide can reach the temperature required by the reforming reaction (shown as formula 1) more quickly after heat exchange, and the reforming reaction is a strong heat absorption process. The cooling speed of the calcium carbide particles is increased, and the cooling efficiency is excellent.
CH4+CO2＝2CO+2H2 ΔH＝247 (1)
kJ/mol
(3) The gases produced by the reforming process are CO and H with high reduction potential2The method can be used in other fields such as metallurgy and chemical industry, the added value of calcium carbide products is greatly increased, and compared with the traditional reforming furnace, the reforming process does not use carbon-containing energy to heat gas, and has a promoting effect on the realization of the double-carbon target in China.
(4) The system and the method provided by the patent can realize simultaneous liquid discharge of a plurality of calcium carbide furnaces, calcium carbide liquid cooling and continuous production of high reduction potential gas, and realize automatic adjustment of calcium carbide particle granularity, reduction gas components and temperature by real-time monitoring of a plurality of sensors and monitoring equipment in cooperation with a computer PLC, thereby reducing the labor intensity of a front-line operator.
(5) This patent the system is closed system, and the carbide granule composition that makes is stable, and the product yield is high, and the system internal gas is whole isolated with external, has positive meaning to improving workman's operational environment.
(6) The device and the method for preparing the gas with high reduction potential by utilizing the sensible heat of the calcium carbide have the advantages of compact structure, good cooling efficiency, high added value of products, low operation cost, simple and convenient operation and the like, and have good application and popularization prospects in a calcium carbide industrial system.
Of course, it is not necessary for any product to achieve all of the above-described technical effects simultaneously in the practice of the invention.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 system for preparing high-reduction-potential gas by calcium carbide liquid molding coupling according to an embodiment of the present invention.
Wherein, 100-gas mixing preheating device; 200-a calcium carbide liquid cooling and reforming device; 300-a calcium carbide particle collecting device; 400-reducing gas collection device; 500-a condition monitoring and regulating device; 501-a first sensor; 502-a second sensor; 1-5-flow meter.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a system and a method for preparing high reduction potential gas by calcium carbide liquid molding coupling, wherein the system comprises:
the gas mixing and preheating device is used for preheating the mixed gas, and simultaneously sending the preheated mixed gas to the calcium carbide liquid cooling and reforming device in a compression blowing and scavenging manner;
the calcium carbide liquid cooling and reforming device is used for cooling the molten calcium carbide liquid, preheating the mixed gas and reforming the mixed gas to prepare high-reduction potential gas;
the calcium carbide particle collecting device is used for collecting the cooled and reformed calcium carbide particles;
the reducing gas collecting device is used for collecting the high reducing potential gas;
the state monitoring and controlling device is used for collecting and monitoring state data in the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device;
the gas mixing and preheating device is connected with the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device is arranged below the calcium carbide liquid cooling and reforming device and extends to the inside of the calcium carbide liquid cooling and reforming device, a gas outlet of the calcium carbide liquid cooling and reforming device is connected with the reducing gas collecting device, and the state monitoring and regulating device is simultaneously connected with the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device.
Wherein the raw material gases (CH 4 and CO)2) The mixed gas is named as mixed gas after being mixed in the mixed gas preheating zone, and carbon monoxide and hydrogen are generated after reforming reaction, and the mixed gas is named as high-reduction potential gas. The preheated gas being CH4And CO2And has no reducing potential. So it cannot be called a reducing potential gas. However, the two gases can be heated to above 600 ℃ and then undergo reforming reaction to produce CO and H2This has a reducing potential.
The gas mixing preheating device comprises a gas mixing preheating zone, a compression injection unit and a scavenging unit, wherein the gas mixing preheating zone is communicated with the calcium carbide liquid cooling and reforming device through the compression injection unit and the scavenging unit;
the compression and injection unit is communicated with a calcium carbide liquid inlet in the calcium carbide liquid cooling and reforming device and is used for injecting molten calcium carbide liquid to obtain high-temperature calcium carbide particles;
the blowing gas unit is communicated with the bottom of the calcium carbide liquid cooling and reforming device and used for forming an air film on the calcium carbide particles and the wall surface of the cooling rotary kiln so as to prevent the calcium carbide particles from being bonded with the wall surface.
The gas mixing preheating device further comprises a plurality of gas transmission channels and a first sensor, the gas transmission channels are connected with the compression blowing unit and the scavenging unit through the gas mixing preheating zone, a flow meter is arranged between each gas transmission channel and the gas mixing preheating zone, the first sensor is arranged in the gas mixing preheating zone, and the first sensor and the flow meter are connected with the state monitoring and regulating device.
The calcium carbide liquid cooling and reforming device comprises a calcium carbide liquid tundish, a calcium carbide liquid inlet, a cooling rotary kiln, a transmission base and a large gear ring, wherein the transmission base passes through the large gear ring and can rotate to cool the rotary kiln, the calcium carbide liquid tundish passes through the calcium carbide liquid inlet and is simultaneously connected with the cooling rotary kiln and the compression and injection unit, and the transmission base is connected with the state monitoring and control device.
The inside guide screw thread that is provided with of cooling rotary kiln, the cooling rotary kiln includes rotary kiln entry end and rotary kiln exit end, carbide liquid entry, compression jetting unit and sweep gas unit are connected simultaneously to the rotary kiln entry end, and the rotary kiln exit end is connected reducing gas collection device and carbide granule collection device simultaneously.
The calcium carbide liquid cooling and reforming device further comprises a thermal infrared imager, and the thermal infrared imager is arranged at the outlet end of the rotary kiln.
The reducing gas collecting device comprises a dust remover, a second sensor, a storage channel and an application channel, one end of the dust remover is communicated with the outlet end of the rotary kiln, the other end of the dust remover is communicated with the storage channel and the application channel, the second sensor is arranged in the middle of the connection of the storage channel and the application channel with the dust remover, and the second sensor is connected with a state monitoring and regulating device.
The invention also provides a method for preparing high-reduction potential gas by calcium carbide liquid molding coupling, which is realized by the system, and the method comprises the following steps:
s1, cooling gas mixing and preheating: uniformly mixing and preheating raw material gas to 100-130 ℃ in a gas mixture preheating zone, then dividing the raw material gas into two paths to enter a calcium carbide liquid cooling and reforming device, wherein one path enters through a compression blowing device in a pressurized blowing manner, and the other path enters through a blowing gas channel;
s2, calcium carbide cooling and reducing gas preparation: the calcium carbide liquid discharged from the calcium carbide furnace is sealed and insulated in a calcium carbide liquid tundish, and calcium carbide particles are formed by spraying and blowing after being discharged from a calcium carbide liquid outlet and fall into a cooling rotary kiln; calcium carbide particles are conveyed to the tail end of the rotary kiln through guide threads, and when the calcium carbide particles are cooled to be below 200 ℃, the calcium carbide particles are discharged and fall into a calcium carbide particle collecting device for screening and collecting; preheating the mixed gas to perform heat exchange with calcium carbide particles, raising the temperature of the mixed gas to perform a reforming reaction, accelerating the temperature reduction of the calcium carbide particles through the strongly endothermic reforming reaction, simultaneously generating high-reduction potential gas, and collecting or applying the gas after dust removal through a dust remover;
s3, automatic adjustment control: the state monitoring and control device monitors the flow of the raw material gas, the temperature and component information of the preheated mixed gas, the component, temperature and pressure information of the high reduction potential gas and the temperature and motion state information of the calcium carbide particles, and simultaneously transmits the information to the control computer PLC for calculation, identification and specific control.
The raw material gas in the S1 comprises rich CH with a certain proportion4Gas and rich CO2Gas, rich in CH4The gas is natural gas, coke oven gas or coal bed gas, and is rich in CO2CO in gas2Is not less than 25%, and CH in the mixed gas4With CO21.
The high reduction potential gas in S2 comprises CO and H2And CO2And CO and H2Is not less than 90%, and H2The ratio to CO is 1.
When the system of the invention is specifically prepared, as shown in figure 1:
the system provided by the invention comprises a gas mixing preheating device (100), a calcium carbide liquid cooling and reforming device (200), a calcium carbide particle collecting device (300), a reducing gas collecting device (400) and a state monitoring and regulating device (500). The gas mixing and preheating device is connected with the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device is positioned below the calcium carbide liquid cooling and reforming device and extends into the calcium carbide liquid cooling and reforming device, a gas outlet of the calcium carbide liquid cooling and reforming device is connected with the reducing gas collecting device, and the state monitoring and regulating device is connected with the sensors (501 and 502), the flowmeter (1-5), the compression and injection device, the thermal infrared imager and the transmission base.
The gas mixing and preheating device is provided with a plurality of gas transmission channels connected with a gas mixing and preheating zone, the gas mixing and preheating zone is provided with two gas outlets, one gas outlet is connected with the front and the back of the compression and injection device, outlets of the compression and injection device and outlets of the scavenging gas channels extend into the calcium carbide liquid cooling and reforming device, the injection pressure and the injection angle of the compression and injection device can be adjusted, the adjustment range of the injection pressure is 0.3 MPa-2.5 MPa, and the adjustment range of the injection angle is 30-60 degrees. The other air outlet is communicated with a scavenging channel, the scavenging channel is positioned at a level slightly higher than the lower edge of the cylinder of the cooling rotary kiln, and the air blown out from the scavenging channel flows along the inner wall surface of the lower part of the cylinder of the cooling rotary kiln.
The calcium carbide liquid cooling and reforming device comprises a calcium carbide liquid tundish, a calcium carbide liquid outlet, a cooling rotary kiln, a transmission base and a large gear ring, wherein the cooling rotary kiln, the transmission base and the large gear ring are arranged in the thermal infrared imager calcium carbide liquid cooling and reforming device. The inside of the cooling rotary kiln is provided with a material guide thread, and the rotating speed of the cooling rotary kiln can be adjusted through the rotation of the transmission base and the large gear ring, so that the retention time of the pellets in the rotary kiln is shortened or prolonged, and the purpose of controlling the pellet temperature is achieved.
The inside screening plant that is provided with of carbide granule collection device can be sieved carbide granule and powder and collect, and the material receiving opening sets up under the export of cooling rotary kiln.
The reducing gas collecting device is provided with a dust remover, gas storage and application equipment, and the high reducing potential gas generated by the reforming reaction can be collected, stored or directly applied after high-temperature dust removal and purification.
The patent also comprises a method for preparing the high-reduction potential gas by calcium carbide liquid forming coupling, which comprises the following specific steps:
s1, cooling gas mixing and preheating: a certain proportion of rich CH4Gas and rich CO2The gas is uniformly mixed and preheated to 100-130 ℃ in a gas mixing preheating zone in the mixing preheating device, and then the gas is divided into two paths to enter a calcium carbide liquid cooling and reforming device, wherein one path enters through a compression blowing device in a pressurized blowing mode, and the other path enters through a blowing gas channel.
S2, cooling the calcium carbide and preparing reducing gas: the calcium carbide liquid discharged from the calcium carbide furnace is sealed and insulated in a calcium carbide liquid tundish, and after being discharged from a calcium carbide liquid outlet, calcium carbide particles are formed under the blowing of a preheated mixed gas of 0.4 MPa-2 MPa and are rapidly cooled, and the calcium carbide particles fall into a cooling rotary kiln. The carbide granule is carried to the rotary kiln end by the guide screw, is discharged and falls into carbide granule collection device and sieves the collection when carbide granule cools off to below 200 ℃. On the other hand, the preheated mixed gas and the calcium carbide particles are subjected to heat exchange, the temperature of the calcium carbide particles is accelerated to be reduced, meanwhile, the temperature of the mixed gas is increased to generate a reforming reaction, high reduction potential gas is generated, and the high reduction potential gas is collected or applied after being dedusted by a deduster.
S3, automatic adjustment control: the sensor 501 monitors the gas temperature and component information in the gas mixing preheating zone, the sensor 502 monitors the component, temperature and pressure information of the high reduction potential gas, the flow meter 1-5 monitors the gas flow, the thermal infrared imager monitors the temperature and motion state information of the calcium carbide particles, and the information is transmitted to the control computer PLC for calculation and identification. Then, the control computer PLC controls the flow meters 1-4 to adjust the flow of the input gas, thereby realizing the free adjustment of the high reduction potential gas components; the flow of the purge gas is adjusted by controlling the flow meter 5 to prevent the calcium carbide particles from being bonded with the wall of the rotary kiln at high temperature; the pressure and the blowing angle of the injected gas are adjusted by controlling the compression blowing device; the rotation speed of the cooling rotary kiln is adjusted by controlling the rotation of the transmission base and the large gear ring.
Further, rich in CH4The gas is natural gas, coke oven gas or coal bed gas, and is rich in CO2CO in gas2Is not less than 25 percent, and CH in the mixed gas4With CO21 to 1.
Further, the prepared high-reduction potential gas contains CO and H2And CO2And CO and H2Is not less than 90% and H2The ratio to CO is 1.
Example 1
Mixing natural gas with rich CO2Gas (CO)230 percent of volume fraction) is introduced into the mixing preheating zone according to a certain flow rate to ensure CH in the mixed gas4With CO21 is 1. And after the mixed gas is preheated to 110 ℃, the mixed gas enters a compression blowing device for pressurized blowing, the blowing pressure is 0.4MPa, and the flow velocity of a blowing gas outlet is 8m/s. The calcium carbide liquid is blown into particles by high-pressure gas, and simultaneously, the mixed gas entering the rotary kiln exchanges heat with the calcium carbide particles to generate a reforming reaction to generate CO and H2High reduction potential gas as a main component is collected and stored after being subjected to high-temperature cloth bag dust removal. The average particle size of the prepared calcium carbide particles is 3mm, and CO and H in the high-reduction-potential gas2Is 91.1%, and H2And CO in a ratio of 1.2.
Example 2
Mixing natural gas with rich CO2Gas (CO)250 percent of volume fraction) is introduced into the mixing preheating zone according to a certain flow rate to ensure CH in the mixed gas4With CO2In a molar ratio of 1. And after the mixed gas is preheated to 130 ℃, the mixed gas enters a compression blowing device for pressurized blowing, the blowing pressure is 0.6MPa, and the flow velocity of a blowing gas outlet is 5m/s. The calcium carbide liquid is blown into particles by high-pressure gas, and the mixed gas entering the rotary kiln exchanges heat with the calcium carbide particles to generate CO and H through reforming reaction2High reduction potential gas as a main component is collected and stored after being subjected to high-temperature cloth bag dust removal. The average particle size of the prepared calcium carbide particles is 2.3mm, and CO and H in the high-reduction-potential gas2Is 93.7%, and H2And CO in a ratio of 1.7.
The invention relates to a method for preparing calcium carbide liquid by molding and couplingSystems and methods for reducing a potential gas are described, wherein the system comprises: the device comprises a gas mixing and preheating device, a calcium carbide liquid cooling and reforming device, a calcium carbide particle collecting device, a reducing gas collecting device and a state monitoring and regulating device. The carbide liquid is by the play outflow of package in the middle of the carbide liquid, and the jetting of high-pressure mist and form the carbide granule, finally falls into gradually by the cooling in the cooling rotary kiln, discharges to carbide granule collection device by the cooling rotary kiln afterwards. The mixed gas is subjected to reforming reaction in the heat exchange process with calcium carbide particles to generate CO with high reduction potential2And H2And collected into a reducing gas collection device. The state monitoring and controlling device monitors gas components, temperature and pressure information in real time, automatically controls the flow of input gas, the injection pressure and angle and the rotary kiln rotation speed, and adjusts the temperature of calcium carbide particles and the high reduction potential gas components. The system and the method for preparing the high-reduction-potential gas by calcium carbide liquid forming coupling have the advantages of safety, stability, low operation cost, good cooling efficiency, compact structure, simplicity and convenience in operation and the like.
The stone liquid particle cooling factor of the invention is two: one is the convective heat transfer between the mixed gas and the calcium carbide particles, and the other is the strong heat absorption process of the reforming reaction, and the emphasis is on the strong heat absorption of the reforming reaction.
The system and the method for preparing the high reduction potential gas by calcium carbide liquid molding coupling provided by the embodiment of the application are introduced in detail. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in articles of commerce or systems including such elements.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A system for preparing high reduction potential gas by calcium carbide liquid forming coupling is characterized by comprising:
the gas mixing and preheating device is used for preheating the reduction potential gas, and simultaneously sending the preheated mixed gas to the calcium carbide liquid cooling and reforming device in a compression blowing and scavenging manner;
the calcium carbide liquid cooling and reforming device is used for granulating and cooling the molten calcium carbide liquid, preheating the mixed gas and reforming the mixed gas to prepare high-reduction potential gas;
the calcium carbide particle collecting device is used for screening and collecting cooled calcium carbide particles;
the reducing gas collecting device is used for collecting the high reducing potential gas;
the state monitoring and regulating device is used for acquiring and monitoring state data in the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device;
the gas mixing and preheating device is connected with the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device is arranged below the calcium carbide liquid cooling and reforming device and extends to the inside of the calcium carbide liquid cooling and reforming device, a gas outlet of the calcium carbide liquid cooling and reforming device is connected with the reducing gas collecting device, and the state monitoring and regulating device is simultaneously connected with the gas mixing and preheating device, the calcium carbide liquid cooling and reforming device, the calcium carbide particle collecting device and the reducing gas collecting device.
2. The system of claim 1, wherein the gas mixing and preheating device comprises a gas mixing and preheating zone, a compression injection unit and a purge gas unit, the gas mixing and preheating zone is simultaneously communicated with the calcium carbide liquid cooling and reforming device through the compression injection unit and the purge gas unit, and the gas mixing and preheating zone is communicated with the calcium carbide liquid cooling and reforming device through the compression injection unit and the purge gas unit;
the compression and injection unit is communicated with a calcium carbide liquid inlet in the calcium carbide liquid cooling and reforming device and is used for injecting molten calcium carbide liquid to obtain high-temperature calcium carbide particles;
the blowing gas unit is communicated with the bottom of the calcium carbide liquid cooling and reforming device and used for forming an air film on the calcium carbide particles and the wall surface of the cooling rotary kiln so as to prevent the calcium carbide particles from being bonded with the wall surface.
3. The system of claim 2, wherein the gas mixing and preheating device further comprises a plurality of gas transmission channels and a first sensor, the plurality of gas transmission channels are connected with the compression blowing unit and the blowing unit through the gas mixing and preheating zone, a flow meter is arranged between each gas transmission channel and the gas mixing and preheating zone, the first sensor is arranged in the gas mixing and preheating zone, and the first sensor and the flow meter are connected with the state monitoring and controlling device.
4. The system as claimed in claim 3, wherein the calcium carbide liquid cooling and reforming device comprises a calcium carbide liquid tundish, a calcium carbide liquid inlet, a cooling rotary kiln, a transmission base and a large gear ring, wherein the transmission base can rotate the cooling rotary kiln through the large gear ring, the calcium carbide liquid tundish is simultaneously connected with the cooling rotary kiln and the compression and injection unit through the calcium carbide liquid inlet, and the transmission base is connected with the state monitoring and control device.
5. The system as claimed in claim 4, wherein a material guiding thread is arranged inside the cooling rotary kiln, the cooling rotary kiln comprises a rotary kiln inlet end and a rotary kiln outlet end, the rotary kiln inlet end is simultaneously connected with the calcium carbide liquid inlet, the compression blowing unit and the scavenging unit, and the rotary kiln outlet end is simultaneously connected with the reducing gas collecting device and the calcium carbide particle collecting device.
6. The system of claim 5, wherein the calcium carbide liquid cooling and reforming device further comprises a thermal infrared imager, and the thermal infrared imager is arranged at an outlet end of the rotary kiln.
7. The system as claimed in claim 5, wherein the reducing gas collecting device comprises a dust remover, a second sensor, a storage channel and an application channel, one end of the dust remover is communicated with the outlet end of the rotary kiln, the other end of the dust remover is communicated with the storage channel and/or the application channel, the second sensor is arranged between the storage channel and the application channel which are connected with the dust remover, and the second sensor is connected with a state monitoring and regulating device.
8. A method for preparing high reduction potential gas by calcium carbide liquid forming coupling is realized by the system of any one of the claims 1 to 7, and is characterized by comprising the following steps:
s1, cooling gas mixing and preheating: uniformly mixing and preheating raw material gas to 100-130 ℃ in a gas mixture preheating zone, then dividing the raw material gas into two paths to enter a calcium carbide liquid cooling and reforming device, wherein one path enters through a compression blowing device in a pressurized blowing manner, and the other path enters through a blowing gas channel;
s2, cooling the calcium carbide and preparing reducing gas: calcium carbide liquid discharged by the calcium carbide furnace is sealed and insulated in a calcium carbide liquid tundish, and calcium carbide particles are formed by spraying and blowing after being discharged from a calcium carbide liquid outlet and fall into the cooling rotary kiln; calcium carbide particles are conveyed to the tail end of the rotary kiln through guide threads, and when the calcium carbide particles are cooled to be below 200 ℃, the calcium carbide particles are discharged and fall into a calcium carbide particle collecting device for screening and collecting; preheating the mixed gas to perform heat exchange with calcium carbide particles, raising the temperature of the mixed gas to perform a reforming reaction, accelerating the temperature reduction of the calcium carbide particles through the strongly endothermic reforming reaction, simultaneously generating high reduction potential gas, and collecting or applying the high reduction potential gas after dust removal through a dust remover;
s3, automatic adjustment control: the state monitoring and regulating device monitors the flow of the raw material gas, the temperature and component information of the preheated mixed gas, the components and temperature and pressure information of the high-reduction potential gas and the temperature and motion state information of the calcium carbide particles, and simultaneously transmits the information to the control computer PLC for calculation and identification and gives specific control.
9. The method of claim 8, wherein the feed gas in S1 comprises a proportion of rich CH4Gas and rich CO2Gas, rich in CH4The gas is natural gas, coke oven gas or coal bed gas, and is rich in CO2CO in gas2Is not less than 25 percent, and CH in the mixed gas4With CO21 to 1.
10. The method of claim 8, wherein the high reduction potential gas in S2 comprises CO, H2And CO2And CO and H2Is not less than 90% and H2The ratio to CO is 1.
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