CN86101663B

CN86101663B - Catalytic purifying sestem for industrial exhaust gas

Info

Publication number: CN86101663B
Application number: CN86101663A
Authority: CN
Inventors: 徐锦航; 叶健民; 董天午; 丁振如; 周强国
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 1986-03-15
Filing date: 1986-03-15
Publication date: 1988-03-23
Also published as: CN86101663A

Abstract

The present invention relates to a catalytic purifying device for industrial exhaust gas, which is used for treating industrial harmful waste gas. The present invention adopts a self-heating catalytic reactor with a built-in catalytic heating element, and a regeneration type filter and omits an exhaust gas preheater. The regeneration type filter can be electrified to burn out burnable pollutants and can also be pull out for cleaning. Compared with the like devices, the present invention has the advantages of small volume, lower energy consumption, little steel consumption, regeneration of the filter, convenient use and maintenance, etc.

Description

The catalytic purification treatment system of exhaust

The catalytic purification treatment system of exhaust is used to administer industrial harmful exhaust.The catalytic purification treatment system of general exhaust mainly is made up of filter, preheater, catalytic reactor and heat exchanger, and other also will dispose annexes such as blower fan, air inlet pipe and blast pipe.When device started, waste gas will pass through preheating earlier, reaches " initiation temperature " of catalytic reaction, just can enter catalytic reactor and carry out catalytic reaction, and purified gas is discharged through over-heat-exchanger again.The mode of preheating also is diversified, is to adopt the coal gas heating as the CU-150 type catalytic purification treatment system of Japan, build a gas preheating chamber in addition, has correspondingly increased equipment investment.Homemade catalytic purification treatment system generally adopts the heating of electricity or far infrared radiation, though equipment investment is littler than Japanese CU-150 type, needs to consume the more energy equally and is used for heating by the exhaust gases.Especially when the intake air temperature of waste gas lower, or combustible concentration is when low, energy resource consumption is just more remarkable.Be guard catalyst in addition, some waste gas needs process filter preliminary treatment earlier, enters arrangement for catalytic purification again.The filter that is adopted wherein generally is stainless steel strip or bits to be contained in the case make.Long-pending for a long time when filter internal contamination thing, need to stop production the whole box body extraction is cleaned or changed with buck.

In order to overcome above-mentioned shortcoming, the present invention has adopted self-heating catalytic reactor (8) and regenerative filter (3).This catalytic reactor is that a kind of top is circular arc camber (19 kuppe), and the cylindrical tube of centre bore is arranged at the bottom, and the catalytic reaction member tube is being placed in its inside.Heating element with catalytic performance (20) (applied for Chinese patent, application number is 85107170) is equipped with on the top of catalytic reaction member tube, and the bottom is alloy honeycomb catalyst (21) in the tube.Therefore, low temperature waste gas needn't can directly enter the self-heating catalytic reactor through preheating, after waste gas runs into the heating element with catalytic performance with uniform temperature on the top of catalytic reaction member tube, catalytic oxidation takes place, arrived the bottom, because gas temperature has surpassed firing point, just needn't heat and can carry out catalytic reaction, thereby save the energy in a large number.The quantity and the relative position of this self-heating catalytic reactor and heating element with catalytic performance, all flexible design as required.

Another feature of the present invention is: the regenerative filter that has adopted the heating of switching on to make charcoal, it is made up of the cigarette piece that blocks of heating and filtering element and placement in parallel.Its heating and filtering element is to be formed around volume together by Fe-Cr-Al alloy wavestrip and insulation flat rubber belting.Blocking the cigarette piece is made by porous high-temperature alloy oblique ripple thin slice.Long-pending for a long time when surface contaminant, can extract out and clean or change, flammable pollutant is burnt in the heating of also can switching on.

Description of drawings:

Fig. 1: the catalytic purification treatment system flow chart of HFZR type exhaust

1, Pitot tube; 2, electric butterfly valve; 3, regenerative filter;

4, safe blower fan; 5, main air blower; 6, check valve;

7, heat exchanger; 8, self-heating catalytic reactor; 9, thermocouple.

Fig. 2: regenerative filter schematic diagram

10, heating element heater; 11, binding post; 12, heat-insulation layer;

13, block the cigarette piece; 14, the blast pipe of making charcoal; 15, the air inlet pipe of making charcoal.

Fig. 3: HFZR-5000 type catalytic purification treatment system main component structural representation

16, air inlet pipe; 17, gas distribution chamber; 18, rupture pressure disc;

19, kuppe; 20, heating element with catalytic performance;

21, alloy honeycomb catalyst; 22, blast pipe.

12, heat-insulation layer; 7, heat exchanger;

Fig. 4: HFZR 300 type catalytic purification treatment system main component structural representations

22, blast pipe; 16, air inlet pipe; 7, heat exchanger;

12, heat-insulation layer; 21, alloy honeycomb catalyst; 20, heating element with catalytic performance;

Embodiment:

HFZR(alloy cellular self-heating) the catalytic purification treatment system of type exhaust, its flow process as shown in Figure 1.Industrial exhaust gas is through Pitot tube 1, and electric butterfly valve 2 enters regenerative filter 3, then by main air blower 5 with the direct warp let-off heat exchanger 7 of harmful exhaust, arrive self-heating catalytic reactor 8 again, the waste gas after the purification is emitted emptying behind the waste heat.Be equipped with thermocouple 9 before and after heat exchanger and the catalytic reactor, in order to the measurement gas temperature.Safe blower fan 4 suction air, the purging when being used for device and starting and the cooling when shutting down.When the flammable nuisance concentration in the industrial exhaust gas surpassed the permission limit, safe blower fan can be opened (self-con-tained unit is arranged) automatically, the air blast dilution.Safe blower fan is switched by individual event valve, also can blow into regenerative filter 3 make charcoal (or remove degreasing thing).

The regenerative filter is as shown in Figure 2: waste gas is through heating element heater 10 and block cigarette piece 13 and remove main air blower.For preventing that pernicious gas from leaking, filter is worked under negative pressure, so filter can open, so that heating element heater and the mounting or dismounting and the cleaning of blocking the cigarette piece.When charcoal and greasy dirt thing run up to a certain degree, can feed fresh airs from the air inlet pipe 15 of making charcoal, make charcoal (or greasy dirt) at the element surface of the heating of switching on, then from blast pipe 14 emptyings of making charcoal.

HFZR-5000 type catalytic purification treatment system main component structural representation is as shown in Figure 3: it has two self-heating catalytic reactors, the circumferential direction inside direction is equipped with six catalytic reaction member tubes, in the tube heating element with catalytic performance and catalyst are housed, there is a gap to be beneficial to air-flow each other and fully mixes, adopt the method for welding that the response element tube is fixed on the reactor base plate.The heat exchanger that device uses is a corrugated plate dst.The import of heat exchanger taps into feed channel, and outlet communicates with the center of reactor bottom.

During operation, start safe blower fan, be blown into fresh air, purge and make heating element with catalytic performance energising preheating, treat that heating element with catalytic performance reaches catalytic reaction when temperature required, the closed safe blower fan.Start main air blower, harmful exhaust is after the preliminary preheating of over-heat-exchanger, and just the outlet by heat exchanger enters the self-heating catalytic reactor by pipeline, upwards flows between the catalytic reaction member tube, obtains preheating for the second time.Then, at top circular arc camber place, air-flow is assigned with, and from top to bottom enters heat exchanger by six response element tubes, provide waste heat after, from blast pipe emptying or carry out UTILIZATION OF VESIDUAL HEAT IN.Waste gas is by behind the heating element with catalytic performance, because waste gas has surpassed initiation temperature, thereby it is during by catalyst layer, needn't be more in addition heating just can play catalytic reaction.When the flammable nuisance in the industrial exhaust gas surpassed setting, safe blower fan was opened, and is blown into fresh air and makes its dilution.In addition, rupture pressure disc is equipped with at this device top, to guarantee handling safety.

HFZR-50; Small-sized catalytic purification treatment system such as HFZR-300 main component structural representation is as shown in Figure 4: its heat exchanger is a spiral plate type, and air inlet enters from a side, rotates to central tube, flows downward, and enters the heating element with catalytic performance central tube.Be assigned with and change into upwards at circular arc camber place air-flow and flow, when being heated to the heating element with catalytic performance 20 of uniform temperature, the catalytic purification reaction takes place, again through two-layer catalyst 21, in the hope of fully carrying out the catalytic purification reaction when flowing through.The heat exchanger of flowing through at last provides heat, and from the top emptying.

This device sees Table one with the technical and economic performance data of other same device contrast.

Table one vides infra.

In the table: UJIB-50, UJIB200, C-1 type are domestic device, adopt pellet type catalyst;

The CU-150 type is Japanese device, uses ceramic honeycomb catalyst.

Table one: arrangement for catalytic purification technical and economic performance contrast table

List of references:

1. see examination department of Patent Office of the People's Republic of China search report, effectively the certificate of entrustment numbering 850034

Claims

1, the catalytic purification treatment system of exhaust is made up of filter, preheater, catalytic reactor and heat exchanger, it is characterized in that: it has adopted self-heating catalytic reactor and regenerative filter.

2, according to the system of claim 1, its self-heating catalytic reactor is that a kind of top is the cylindrical tube that circular arc camber, bottom have centre bore, and the catalytic reaction member tube is being placed in its inside.

3, according to the system of claim 2, the top of its catalytic reaction member tube is heating element with catalytic performance, and its underpart is an alloy honeycomb catalyst.

4, according to the system of claim 1, its regenerative filter is made up of the cigarette piece that blocks of heating and filtering element and placement in parallel.

5, according to the system of claim 4, its heating and filtering element is to be formed around volume together by Fe-Cr-Al alloy wavestrip and insulation flat rubber belting, blocks the cigarette piece and is made by porous high-temperature alloy oblique ripple thin slice.