CN101210916A - Gas-solid reaction kinetic parameter analyzer - Google Patents
Gas-solid reaction kinetic parameter analyzer Download PDFInfo
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- CN101210916A CN101210916A CNA2006101715153A CN200610171515A CN101210916A CN 101210916 A CN101210916 A CN 101210916A CN A2006101715153 A CNA2006101715153 A CN A2006101715153A CN 200610171515 A CN200610171515 A CN 200610171515A CN 101210916 A CN101210916 A CN 101210916A
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Abstract
A kinetic parameter analyzer for gas/solid reaction comprises an electric furnace arranged with a thermocouple; a micro-reactor loaded with flowing medium particles and positioned in the electric furnace; a pressure sensor and a temperature control device for controlling the temperature of the flowing medium particles, which are arranged in the reactor; a reactant supplier for supplying solid-state reactant to the flowing medium particles; a gas supply device arranged on the bottom of the reactor for providing gas into the reactor; a gas purifier and a detector sequentially communicated with the upper gas outlets of the reactor; a data collector with the input terminals thereof respectively connected with the output terminals of the pressure sensor, the temperature control device, a temperature display meter and the detector; and a computer for controlling the opening/closing of the reactant supplier and analyzing the data inputted by the data collector. The analyzer adopts a micro-fluidized bed or a micro-spouted bed as the reactor, which facilitates the online addition of the solid-state reactant, so that the reaction environment is more approximate to the actual environment and to the actual reaction conditions and that the measured kinetic parameters are more close to intrinsic reaction kinetics.
Description
Technical field
The invention belongs to the chemical analysis test field, relate to a kind of gas-solid reaction kinetic parameter analyzer.This gas-solid reaction kinetic parameter analyzer can accurately be measured reaction velocity, reaction time, and determine reaction power mathematic(al) parameter such as reaction activity by analysis-by-synthesis, be specially adapted to require online solid-state reactants to add and key product is the gas-solid reaction of gas.
Background technology
The Chemical Kinetics parameter is the starting point of ambit research and developments such as chemistry, chemical industry, heat energy, material, the energy, environment as the measurement of reaction velocity.The measurement of chemical reaction velocity has two kinds of methods: the differential method and integral method.But integral method need presuppose a reaction kinetics expression formula, and is subjected to the influence of the complicacy of reaction itself and reactor self-condition bigger.So the differential method is to be used for measuring the reacting dynamics characteristic parameter of certain chemical reaction or reactive system, the particularly more effective ways of the reaction power mathematic(al) parameter under differential responses condition (as temperature) in actual applications.
For the gas-solid or the gas-liquid chemical reaction that cause by adding gas reactant, various thermogravimetric analyzers (TGA) are exactly a kind of reaction kinetics of differential preferably testing tool.It can provide the reaction velocity that is reflected under the arbitrary temp of studying, and derives the Arrhenus curve, and investigates the relation that it becomes to grade with pressure, gas reactant.But the ultimate principle of thermogravimetric analysis is the weight change when measuring solid or liquid substance and changing with conditions such as temperature, pressure and gas compositions.Its requires the solid that will will measure or fluid sample to pack in advance in the reaction tank of TGA, and only can adjustments of gas atmosphere condition after temperature program(me) begins, and can not add, reduces and exchange for solid or fluid sample.Therefore, gravitational thermal analysis method be difficult to analyze the chemical reaction that begins by adding solid, liquid attitude reactant under arbitrary temp reaction velocity or finish these and react the needed reaction time.On the other hand, the analytical approach of TGA is by heating given solid, liquid body sample or starting chemical reaction or physical change process to wherein adding gas reactant.This with actual conditions in more be that to add the mode of operation of solid or liquid reactants to the reactor with reaction conditionss such as definite temperature, pressure different fully.So, the reaction velocity that thermogravimetric analysis is measured usually and the reaction velocity in the real process differ bigger.One of them major reason be among the TGA by the material of gas static solid, liquid precursor reactant thing in being loaded on reaction tank and heat transferred respectively based on diffusion and conduction, and the chemical reaction in the real reaction device is owing to betide in solids movement or the liquid flow process usually, thereby has other mass transfer, heat transfer path such as Surface Renewal.Though TGA can be to a certain extent be analyzed heat and transmit the different influences that caused by changing the rate of heat addition, the maximum heating speed that it can be realized (counting 10K/min) is the heating rate in numerous real reaction devices often.
The reaction velocity of chemical reaction under arbitrary temp and atmosphere condition for accurate online interpolation solid of test request or liquid reactants has the different apparatus and method of two classes once not to be studied the person and adopts.One class is based on that the thermogravimetric analysis principle design forms allow in high temperature reaction stove, to pack into the fast special reaction balance of the reaction tank that carries sample of reaction mass.As Naruse etc. (chemical engineering thesis collection, 2001, Vol.27 pp.604-609) has adopted a kind of heating furnace moving up and down.This stove is at first at the atmosphere of hope with do not have to be heated to the temperature that sets under the condition of reaction tank, moved the reaction tank that reaction mass is housed on fast includedly then by moment, starts chemical reaction.Because reaction tank itself does not move, so this method can be come analytical reactions dynamics by the variation of measuring weight of material in the reaction tank.Another kind of device then is the differential reactor of resolving reaction kinetics by the variation of the gas product after the analytical reactions.Bench-scale fluidized-bed reactor (Megarities et al.Energy﹠amp; Fuels, 1998, Vol.12, pp.144-151) and the Drop-tube stove (Hayashi et al.Fuel, 2000, Vol.79, though pp.439-447) can measure under arbitrary temp, they all are not stricti jurise codifferential reactors.Though and Mesh-heater and Curie-point reactor also are used for studying Rapid Thermal resolution characteristic (the Wiktosson and Wanzl of fuel for a long time, Fuel, 2000, Vol.79, pp.701-716), but but they can not test reaction power mathematic(al) parameter under the arbitrary temp.Because gas-solid effect and corresponding heat transfer, mass transfer and the diffusion process that takes place in the actual solid material reactor can really be simulated and reproduce to fluidized-bed reactor, and, therefore use fluidized bed to have best reliability and application as the reaction kinetics analytical approach of reactor than the online supply that is easier to realize solid reactant.But, have large-size, with similar reactor (Megarities etal, the Energy﹠amp of Bench-scale; Fuels, 1998, Vol.12 pp.144-151), as about diameter 40 to 100mm, high 500～1000mm etc., is not real differential reactor usually.Processes such as the gas mixing that exists in such reactor, diffusion will resemble the such rapid-action reaction power mathematic(al) parameter of biomass thermal decomposition to measurement and bring huge difficulty.And for the size of reactor, owing to go back the unified standard of neither one, therefore the different researchers experimental data that adopts the reactor of different size to obtain must have serious dispersiveness.
Summary of the invention
The objective of the invention is to utilize miniature fluidized bed or spouted bed as reactor to overcome some shortcomings of existing differential reaction kinetics analyser, provide a kind of can be used to that the online solid-state reactants of accurate measurement requirement is added and key product be the gas-solid reaction of gas under temperature conditions arbitrarily reaction velocity or finish the needed reaction time of reaction, and analyze the gas-solid reaction kinetic parameter analyzer of determining Chemical Kinetics parameters such as reaction activity.
Technical scheme of the present invention is as follows:
Gas-solid reaction kinetic parameter analyzer provided by the invention comprises:
One is furnished with the electrothermal furnace 9 that temperature shows thermopair 4;
One is positioned at the microreactor 10 of the dress flow media particle 11 of electrothermal furnace 9;
Described microreactor 10 is equipped with pressure transducer 8 and in order to monitoring and control the temperature control equipment of described flow media particle temperature;
One supplies with the reactant feeder 2 of solid-state reactants by being arranged at circulation duct on described microreactor 10 bottoms or the sidewall in described flow media particle 11;
One provides the gas supply device 1 of gas by being arranged at described microreactor 10 bottoms in it;
Export gas purifier 12 and the detecting device 13 that is connected with described microreactor 10 upper gas successively;
And
The output terminal of described pressure transducer 8, temperature control equipment, temperature display watch 7 and detecting device 13 is connected to the input end of described data acquisition unit 14; The switch motion of 15 pairs of described solid-state reactants feeders 2 of described computing machine is controlled, and the data of described data acquisition unit 14 inputs are analyzed.
Described microreactor 10 is the miniature fluidized-bed reactor that quartz or metal are made, or is the miniature spouted bed bioreactor that quartz or metal are made;
The xsect of described microreactor 10 is square or circular, and its area of section is approximately 300mm
2, highly be 100～200mm.
Described temperature control equipment is made up of with the temperature controller 6 that links to each other with described thermocouple 3 thermocouple 3 that stretches into the reactor thermocouple sheath 5 within the described flow media particle 11 and stretch into described thermocouple sheath 5;
Described reactant feeder 2 is carried feeder for strength, and described microreactor 10 lower, transverse are equipped with gas distribution grid 16.
Described strength carries feeder to link to each other with described gas supply device 1, carries feeder for described strength transmitting power is provided.
In the described microreactor 10 gas distribution grid is not installed, described reactant feeder 2 is carried feeder for strength, and solid-state reaction material and fluidizing gas are sent into the described Solid Bed material 11 from the same passage of described microreactor 10 bottoms.
Described solid-state reactants feeder 2 is the piston type feed arrangement, by being loaded on the piston sleeve 21 that is communicated with described flow media particle 11 on described microreactor 10 sidewalls and being loaded on connecting rod piston 20 within the described piston sleeve 21, and the transfer device that promotes connecting rod piston 20 motions is formed.
As shown in Figure 1, gas-solid reaction kinetic parameter analyzer of the present invention is made of material control system, temperature and control pressurer system, reaction generation systems, product detection system and data collection and analysis system five major parts.Accompanying drawing 1 is depicted as implements that of the present invention a kind of to utilize miniature fluidized bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by strength as the supply of reactor and solid-state reactants.Wherein, material control system comprises fluidizing gas flowmeter 1, solid-state reactants feeder 2 and corresponding gas bomb, connecting line and by-pass valve control etc.; Solid-state reactants feeder 2 is made of solid-state reactants pond 17, feed gas flowmeter 18 and a two-position three way magnetic valve 19, and solid-state reactants pond 17 is connected with the normally closed road of two-position three way magnetic valve 19, and the feed gas bypass is connected with the normal open circuit of two-position three way magnetic valve 19.Temperature and control pressurer system comprise reactor thermopair 3, electrothermal furnace thermopair 4, reactor thermocouple sheath 5, temperature controller 6, temperature display watch 7, pressure transducer 8 and electrothermal furnace 9; The reaction generation systems comprises that mainly a cross-sectional area is approximately 300mm
2About, highly be that mean grain size on miniature quartz or the metal flow fluidized bed reactor 10 of 100～200mm and the porous dispersion plate 16 that is in fluidized-bed reactor 10 bottoms accordingly is the quartz sand particle Solid Bed material 11 of 200～300 μ m, the work loading height of silica sand is greatly between 1/10～1/2 height for reactor; The product detection system mainly is made of gas purifier 12 and detector 13; Data acquisition and analytic system comprise data acquisition unit 14, computing machine 15 and control of corresponding system and data analysis software etc.
Close connection between described each main member of reaction kinetics parameter analyzer and position: the reactor 10 that Solid Bed material 11 is housed is placed into the inside of electrothermal furnace 9.Reactor thermopair 3 is inserted in the reactor thermocouple sheath 5 that is in Solid Bed material 11 inside to measure temperature of reaction and to control the heating power of electrothermal furnace 9 by temperature controller 6.Electrothermal furnace thermopair 4 be inserted into electrothermal furnace 9 inside and in the outside of reactor 10 to monitor the actual heating-up temperature of electrothermal furnace 9 by temperature display watch 7.The input end of pressure transducer 8 passes to the actual pressure of measuring in the reactor 10 mutually with the top free space of reactor 10.The import and export of fluidizing gas flowmeter 1 communicates with the gas inlet tube of fluidizing gas supply pipe and reactor 10 bottoms respectively.On the sidewall of the reactor below the upper horizontal plane of Solid Bed material 11 10, be provided with the material inlet pipe of solid-state reactants feeder 2, and link to each other with the material outlet pipe of solid-state reactants feeder 2.Gas purifier 12 and detector 13 are linked in sequence after the gas outlet tube on reactor 10 tops.The data such as concentration of key product are all passed through and are entered computing machine 15 after data acquisition unit 14 is gathered and analyze and handle in all flows, pressure, temperature and the reactor outlet gas.
The basic operation process of described reaction kinetics parameter analyzer is: the reactor 10 that an amount of Solid Bed material 11 (as the quartz sand particle that does not contain other impurity after physical and chemical processes such as overpickling, drying are handled) will be housed is put into the medium position of electrothermal furnace 9 and fixing.Weighing trace solid-state reactants 5～50mg puts into the solid-state reactants pond 18 of solid-state reactants feeder 2.The valve of opening fluidizing gas flowmeter 1 makes that gas feeds reactor 10 in the gas bomb, the size of regulating this gas flow make under setting temperature of reaction the superficial gas flow velocity in the reactor 10 greater than the incipient fluidizing velocity of Solid Bed material 11 less than its carrying velocity (terminal velocity).Open the valve of feed gas flowmeter 18, gas will pass through from the feed gas bypass this moment, and near I haven't seen you for ages greater than the minimum clamp tape speed of Solid Bed material 11 but the size that must regulate this gas flow makes under this gas flow gas flow rate in the solid-state reactants pond 17.The electrical heating switch of setting temperature of reaction and opening electrothermal furnace 9 by temperature controller 6 slowly rises the temperature in the reactor 10.When the temperature in the question response device 10 finally was stable at the temperature of reaction of setting, the sampling routine that activates on the computing machine 15 began sampling.The switch of opening two-position three way magnetic valve 19 in the solid-state reactants feeder 2 then rapidly switches to solid-state reactants pond 17 with feed gas, infeed with mode moment of load weighted solid-state reactants being utilized strength carries and to start reaction in the Solid Bed material 11, and the parameters such as concentration of actual heating-up temperature, the actual pressure in the reactor 10 and reaction key product by temperature display watch 7, pressure transducer 8 and computing machine 15 monitoring reacting furnaces 9 over time.The reaction key product in the end concentration in the product gas at first can rise gradually along with the carrying out of reaction, descends gradually again then, when the density loss to 1.0% of question response key product is following, stops to sample.Start the DAP in the computing machine 15, and press the form output measurement result of customer requirements.By the kind that changes the pressure in reaction design temperature, the reactor 10 and feed gas in the reactor 10, this reaction kinetics parameter analyzer can be used for measuring the influence of the change of temperature of reaction, pressure and atmosphere to the reaction power mathematic(al) parameter.In the aforesaid operations process, the switch motion of all relevant devices and mechanically actuated are all controlled automatically and are finished by control circuit by computing machine 15.
The principle of work and the data processing method of described reaction kinetics analyser are as follows: because when the reaction design temperature, Solid Bed material 11 in the reactor 10 will be in the state of stabilization fluid or violent turbulence, therefore when solid-state reactants is sent in the Solid Bed material 11 by moment, fluidized bed good heat transfer, mass-transfer performance will make solid-state reactants be begun to react to setting temperature of reaction by transient heating, and the gaseous product that reaction obtains also can be released in the gas phase soon.The gaseous product that reaction obtains comes out and is called system response through the time that arrives detectors 13 behind the gas purifier 12 to postpone from reactor 10, and this delay can more easily be determined in advance.So, opens solid-state reactants feeder 2 switches and begin to supply with the zero hour that moment of solid-state reaction materials can be defined as reacting, and the moment that reaction finishes should be the response delay time that moment that computing machine 15 stops to sample deducts system to reactor 10.Certainly, if the response delay time of system is enough little, in data handling procedure, also can ignore.Because the solid-state reactants amount of online interpolation is minimum, therefore the effluent air amount can be approximate with the total gas flow by fluidizing gas flowmeter 1 and feed gas flowmeter 18 from reactor 10.Like this, can determine reaction velocity under this temperature of reaction and the pressure at an easy rate according to the concentration change of reaction key product, and the reaction power mathematic(al) parameters such as energy of activation that further go out to react according to the Arrhenus Equation for Calculating.
The principal character of reaction kinetics parameter analyzer of the present invention is to have substituted the reaction tank that is similar to fixed bed among the TGA with miniature fluidized bed, perhaps Bench-scale reactor (Megarities et al, Energy﹠amp; Fuels, 1998, Vol.12, pp.144-151) and Drop-tube stove (Hayashi et al.Fuel, 2000, Vol.79, the bigger fluidized-bed reactor that is adopted in pp.439-447).The technique effect that utilizes These characteristics to realize is: (1) has been adopted fluidized bed to make online interpolation solid-state reactants become as reactor and has been more prone to, and environment and real reaction condition that reaction takes place are more approaching; (2) add micro-solid-state reactants and adopt miniature fluidized-bed reactor to make this reaction kinetics analyser real differential reactor of can being known as, measure resulting reaction power mathematic(al) parameter and also more approach the intrinsic kinetics that reacts; (3) heating makes furnace temperature be stabilized in the reaction design temperature in advance, and the mode of operation of online then interpolation solid-state reactants and fluidized bed good heat transfer, mass-transfer performance make the reaction power mathematic(al) parameter of measuring under any temperature of reaction become possibility.
Description of drawings
Accompanying drawing 1 implements that of the present invention a kind of to utilize miniature fluidized bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by strength as the supply of reactor and solid-state reactants;
Accompanying drawing 2 implements that of the present invention a kind of to utilize miniature fluidized bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by machinery as the supply of reactor and solid-state reactants;
Accompanying drawing 3 implements that of the present invention a kind of to utilize miniature spouted bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by strength as the supply of reactor and solid-state reactants.
Embodiment
Of the present invention a kind of to utilize miniature fluidized bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by machinery as the supply of reactor and solid-state reactants in order to implement for accompanying drawing 2.It is characterized in that solid-state reactants feeder 2 is actually by a piston sleeve 21 that has a piston 20 and corresponding mechanical linkage is constituted, and the material supply pipe of piston sleeve 21 by reactor 10 sidewalls directly feeds in the Solid Bed material 11 of reactor 10.
In the measurement mechanism shown in the accompanying drawing 2, put into load weighted micro-solid-state reactants within the piston sleeve 21 and be in a side of the close reactor 10 on band connecting rod piston 20 the right.At this moment, as long as open the switch of solid-state reactants feeder 2, the piston 20 that has a connecting rod will move right rapidly and will place the solid-state reactants on its right directly to push after the Solid Bed material 11 in the reactor 10 correcting action rapidly again.Need to prove that in the data analysis processing procedure, this moment, the total gas flow by reactor 10 should be similar to the gas flow by fluidizing gas flowmeter 1.Other operating process of this measurement mechanism and data analysis processing method and in full accord to the explanation of accompanying drawing 1.
Of the present invention a kind of to utilize miniature spouted bed be the reaction kinetics parameter measuring apparatus structural representation that transports realization by strength as the supply of reactor and solid-state reactants in order to implement for accompanying drawing 3.Be primarily characterized in that the porous dispersion plate of having cancelled reactor 10 bottoms forms it for a typical miniature spouted bed bioreactor.
In accompanying drawing 3, owing to also played the effect of the Solid Bed material 11 in the fluidized reactor 10 this moment simultaneously by the gas of feed gas flowmeter 18, therefore its operating process is except saving the step of opening fluidizing gas flowmeter 1 and adjustments of gas flow, other operation steps with to accompanying drawing 1 described basically identical.In data analysis and processing procedure, the effluent air amount can be similar to the gas flow by feed gas flowmeter 18 from reactor 10.
Several reaction kinetics parameter measuring apparatus shown in the accompanying drawing 1 to 3 all are several embodiment of the present invention, are not the restriction that the present invention is carried out.
Claims (7)
1. gas-solid reaction kinetic parameter analyzer comprises:
One is furnished with the electrothermal furnace (9) that temperature shows thermopair (4);
One is positioned at the microreactor (10) of the dress flow media particle (11) of electrothermal furnace (9);
Described microreactor (10) is equipped with pressure transducer (8) and in order to monitoring and control the temperature control equipment of described flow media particle temperature;
One supplies with the reactant feeder (2) of solid-state reactants by being arranged at circulation duct on described microreactor (10) bottom or the sidewall in described flow media particle (11);
One provides the gas supply device (1) of gas by being arranged at described microreactor (10) bottom in it;
Export gas purifier (12) and the detecting device (13) that is connected with described microreactor (10) upper gas successively; And
Data acquisition unit (14) and the computing machine (15) that links to each other with described data acquisition unit (14);
The output terminal of described pressure transducer (8), temperature control equipment, temperature display watch (7) and detecting device (13) is connected to the input end of described data acquisition unit (14); Described computing machine (15) is controlled the switch motion of described solid-state reactants feeder (2), and the data of described data acquisition unit (14) input are analyzed.
2. by the described gas-solid reaction kinetic parameter analyzer of claim 1, it is characterized in that described microreactor (10) is the miniature fluidized-bed reactor that quartz or metal are made, or be the miniature spouted bed bioreactor that quartz or metal are made;
The xsect of described microreactor (10) is square or circular, and its area of section is approximately 300mm
2, highly be 100～200mm.
3. by claim 1 or 2 described gas-solid reaction kinetic parameter analyzers, it is characterized in that described temperature control equipment is made up of with the temperature controller (6) that links to each other with described thermocouple (3) the thermocouple (3) that stretches into the reactor thermocouple sheath (5) within the described flow media particle (11) and stretch into described thermocouple sheath (5);
4. by claim 1 or 2 described gas-solid reaction kinetic parameter analyzers, it is characterized in that described reactant feeder (2) is carried feeder for strength, described microreactor (10) lower, transverse is equipped with gas distribution grid (16).
5. by the described gas-solid reaction kinetic parameter analyzer of claim 4, it is characterized in that described strength carries feeder to link to each other with described gas supply device (1), carry feeder for described strength transmitting power is provided.
6. by claim 1 or 2 described gas-solid reaction kinetic parameter analyzers, it is characterized in that, described microreactor is not installed gas distribution grid in (10), described reactant feeder (2) is carried feeder for strength, and solid-state reaction material and fluidizing gas are sent into the described Solid Bed material (11) from the same passage of described microreactor (10) bottom.
7. by claim 1 or 2 described gas-solid reaction kinetic parameter analyzers, it is characterized in that, described solid-state reactants feeder (2) is the piston type feed arrangement, by being loaded on the piston sleeve (21) that is communicated with described flow media particle (11) on described microreactor (10) sidewall and being loaded on connecting rod piston (20) within the described piston sleeve (21), and the transfer device that promotes connecting rod piston (20) motion is formed.
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