CN105296012A - Hot mould testing method for slag gasification furnace - Google Patents

Abstract

A hot mould testing method for a slag gasification furnace comprises the following steps: assay of test raw materials, cold test of a hot mould device, ignition of the hot mould device, adjustment of operation conditions of the hot mould device, and hot test of the hot mould device. When the whole test is about to finish, nitrogen gas is led in, the furnace is stopped suddenly, reactants in a whirling area are sieved, particle size distribution is detected, and sampling is carried out for technical analysis; after the whole test is finished, layered sampling is conducted on solid slag after liquid slag in an overflow-type slag bath is cooled down, and composition of the samples is detected; meanwhile, whether unreacted coal exists at the bottom of a chilling chamber or not is observed, and sampling is carried out for technical analysis. Via repeated tests, technical problems existing in the running process of the hot mould device are found and solved, so that the development efficiency of the slag gasification furnace is greatly improved.

Description

A kind of slag gasification furnace Model test in heat state method

technical field:

The present invention relates to slag gasification furnace, relate in particular to a kind of slag gasification furnace Model test in heat state method.

Background technology

In China, to produce the New Coal Chemical Industry of clean energy and alternative petrochemicals, as national most development strategy, be faced with good opportunity.After entering 21 century, International Crude Oil is unprecedented soaring, and the resource distribution situation of China belongs to rich coal oil starvation weak breath type, based on this, domestic coal chemical industry obtains unprecedented great development, gasification as the leading technology of Coal Chemical Industry, along with the fast development of Coal Chemical Industry, nearly ten years, Coal Gasification Technology also achieves the development of advancing by leaps and bounds.But also there is no a set of perfect, feasible slag gasification furnace Model test in heat state method at present.

Chinese Patent Application No. is a kind of blast furnace slag gasification system and the method for 200910012471.3, comprises slag gasification furnace, coal injection system, coal gas collection device and slag collection device; Slag gasification furnace is provided with slag import, slag outlet, gas exit and partition wall; Gas exit connects coal gas collection device, and slag outlet is provided with baffle plate; Slag outlet connects slag collection device.Method is: blast furnace slag is put into slag gasification furnace through slag stream ditch by slag import; Coal dust and vaporized chemical are jetted in slag gasification furnace by spray gun, by the slag take-off rate of the Altitude control slag outlet of controllable register, although it decreases energy consumption to a certain extent, be not suitable for the cinder of larger particles, the correlation parameter in generating process can not be read.

Summary of the invention

The object of the invention is mainly in order to solve following technical problem:

(1) whether under the high temperature conditions can long-time steady operation, suitable discharge in the cooling tube exploring slag bath and water wall, gropes contacting between refractory thickness and its cold and hot surface temperature variation if investigating vapourizing furnace overflow type slag bath, water wall and refractory materials.

(2) whether the overflow port size investigating vapourizing furnace overflow type slag bath is suitable, gropes the size composition of each layer material composition and raceway zone in slag bath.

The present invention is achieved in that a kind of slag gasification furnace Model test in heat state method, comprises the steps:

Step 1. test raw material is chemically examined;

Step 2. hot-die device cold test;

The igniting of step 3. hot-die device;

The adjustment of step 4. hot-die device operational condition;

The hot test of step 5. hot-die device;

Step 6., at the end of test is fast, passes into nitrogen and carries out unexpected blowing out, carries out screening measure size-grade distribution to raceway zone reactant, and technical analysis is carried out in sampling simultaneously;

After step 7. off-test, after the melt cinder cooling in overflow type slag bath, carry out stratified sampling to solid slag, and measure its composition, meanwhile, observe bottom shock chamber whether have unconverted coal, technical analysis is carried out in sampling;

After step 8. off-test, observe the damage situations of refractory materials inside vapourizing furnace cooling stave and slag bath, to its sampling of taking pictures, analyze its damage reason.

In described step 2, hot-die device cold test comprises the steps:

1) before test, camera and light source are installed bottom vapourizing furnace shock chamber, close bottom shock chamber, open gasifier gas outlet valve;

2), in process of the test, keep into the maximum air capacity 250Nm of stove ³/ h, after entering stove air capacity and be stable, adds 10-20kg coal, opens vapourizing furnace coal bunker lower valve door, add in vapourizing furnace by coal in coal bunker in vapourizing furnace coal bunker;

3) pay close attention to from computer video and whether have coal to fall into shock chamber from vapourizing furnace slag bath overflow port, fall coal phenomenon not serious time, write down into stove air pressure and furnace pressure;

4) repeat to add the coal of equal in quality toward stove in, observation vapourizing furnace overflow port state, and write down as-fired coal accumulated quality, enter stove air pressure and furnace pressure.

In described step 3, the igniting of hot-die device comprises the steps:

1) before the test, vapourizing furnace slag bath overflow port is covered with plank;

2) with ready solvent or diluent and cotton yarn, charcoal is ignited outside stove, after charcoal all burns, be poured in vapourizing furnace from vapourizing furnace manhole;

3) add ready charcoal and raw coal, blowing air in vapourizing furnace, air capacity controls at 10Nm ³/ h, seals vapourizing furnace manhole;

4) observe stove combustion situation from the peep hole that gasifying furnace nozzle is other, and pay close attention to Temperature displaying and the temperature out display of refractory materials heating surface, slowly toward coal in stove from raw material cabin, strengthen into stove air capacity simultaneously; When refractory materials heating surface displays temperature reaches 1000 DEG C, in vapourizing furnace, fill it up with coal, stove air capacity will be entered simultaneously and be transferred to trial value, start the collection of testing data.

In described step 5, the hot test of hot-die device comprises: the determination of the determination of best water flow amount in the cooling tube of overflow type slag bath and water wall, refractory thickness and its cold and hot surface temperature variation relation, reflect accounting of gas composition measurement and integral energy.

Described overflow type slag bath and the interior suitable discharge of the cooling tube of water wall are determined to comprise the steps:

1) measure a cooling stave inner lining refractory thickness respectively afterwards before the test, according to Theoretical Calculation, the discharge preset in cooling stave cooling tube is 9m ³/ h, 0.5h measure the cold and hot surface temperature of the import and export temperature of cooling water of a cooling tube, the cold and hot surface temperature of inner lining refractory and cooling stave, the known heat transfer coefficient of resistance to material and convective heat-transfer coefficient between water and tube wall, the exactness that proof theory calculates;

2) by regulating the discharge in cooling stave cooling tube, the import and export temperature difference of water coolant can be remained on 5 DEG C, thus the desired flow of water coolant can be obtained, and instead can release refractory materials heating surface temperature by calculating.

The present invention, by repetition test, has found the technical problem that hot-die device exists in operational process, and has solved, substantially increased the development efficiency of slag gasification furnace.

Accompanying drawing explanation

Fig. 1 is analysis project list of the present invention;

Fig. 2 is data logging bulleted list of the present invention;

Fig. 3 is Model test in heat state processing parameter cartogram I of the present invention;

Fig. 4 is Model test in heat state processing parameter cartogram II of the present invention;

Fig. 5 is that Model test in heat state of the present invention is worked off one's feeling vent one's spleen data on bulk analysis table;

Fig. 6 is cold test data logger of the present invention.

Embodiment

This test selects raw coal as reaction mass, and the concrete coal data of raw coal is as shown in the table:

Table 1-1 technical analysis

Sample	Mad%	Aad%	Ad%	Vad%	Vd%	Vdaf%	FCd%	CRC
									Raw coal	8.86	8.65	9.49	30.83	33.83	37.37	56.68	2

Table 1-2 ultimate analysis

Sample	Cad%	Cd%	Had%	Hd%	Nad%	Nd%	Oad%	Od%	St,ad%
										Raw coal	66.13	72.56	3.52	3.86	0.80	0.88	11.65	12.78	0.39

Table 1-3 thermostability/%

Sample	TS+6	TS6-3	TS-3
				Raw coal	81.1	13.8	5.1

Table 1-4 ash fusibility/DEG C

Sample	DT	ST	HT	FT
					Raw coal	1250	1290	1300	1320

Table 1-5 ash fusibility/DEG C

Sample	DT	ST	HT	FT
					Raw coal	1250	1290	1300	1320

Test prepares

(1) test the preparation of raw coal used, comprise fragmentation, screening;

Test raw coal used, particle diameter is 6 ~ 18mm;

(2) test need prepare 2 bottles of nitrogen;

(3) sieve that preliminary screening is used, aperture is 2mm, 6mm and 13mm;

(4) charcoal, cotton yarn, the solvent or diluent needed for test is prepared.

Test arrangement

(1) hot-die device cold test

Before test, install camera and light source bottom shock chamber, close bottom shock chamber, turn on the gas-fire outlet valve.In process of the test, keep into the maximum air capacity of stove and 250Nm ³/ h, after entering stove air capacity and be stable, adds 15kg coal, opens coal bunker bottom valve, add in stove by coal in coal bunker in coal bunker, and whether pay close attention to from computer video has coal to fall into shock chamber from slag bath overflow port simultaneously.If it is not serious to fall coal phenomenon, write down now enter stove air pressure and furnace pressure.Interval like this is constantly toward coal in stove, and each coal amount is 15kg, observation overflow port state, and writes down as-fired coal quality (cumulative amount), enters stove air pressure and furnace pressure.

(2) hot-die device igniting

Before the test, slag bath overflow port is covered with plank.With the solvent or diluent prepared and cotton yarn, charcoal is ignited outside stove, prepare a part of charcoal and raw coal again, after charcoal all burns simultaneously, be poured in stove from manhole, and add ready charcoal and raw coal, then toward blowing air in stove, air capacity can be controlled in 10Nm ³/ h, seals manhole simultaneously.Observe stove combustion situation from the peep hole that nozzle is other, and pay close attention to Temperature displaying and the temperature out display of refractory materials heating surface, after two temperatures raises gradually, slowly toward coal in stove from raw material cabin, strengthen into stove air capacity simultaneously.When refractory materials heating surface displays temperature reaches 1000 DEG C, in stove, fill it up with coal, stove air capacity will be entered simultaneously and be transferred to trial value, start Test Data Collecting, fill in the form described in Fig. 1-6.

(3) hot-die device operational condition is determined.

The principal reaction medium of hot-die device is air and raw coal (or coke), and the principal reaction of generation is as follows:

1. using raw coal as reaction mass, entering stove air themperature is 200 DEG C, and entering stove air capacity is 250Nm ³/ h, calculating and consuming raw coal amount is 42.53kg/h, and producing slag amount is 3.68kg/h.

Overflow type slag bath volume after refractory materials is padded is:

(3.14*0.2142-3.14*0.1452)*0.106/5=0.001649m ³

Known melt cinder density is 2500kg/m ³, then slag bath starts the minimum melt cinder amount needed for overflow is 0.001649*2500=4.12kg, and converting required raw coal amount is 47.66kg

Then from on-test to slag bath, the minimum time produced needed for overflow is 4.12/3.68=1.12h

2. be reaction medium with raw coal, energy balance calculating carried out to the process of the test of hot-die device:

Bring heat into:

I known enter stove air capacity be 250Nm ³/ h, air themperature is 200 DEG C (473.15K), and air ratio thermal capacitance is 1.03KJ/ (Kg*K), then air is brought sensible heat into and is

250*1000/22.4*29/1000*473.15*1.03=157734.3kJ/h

Ii raw coal combustion liberated heat is 250*0.21*1000/22.4*393.5=922265.63kJ/h

Then altogether bringing heat in process of the test into is 157734.3+922265.63=1079999.9kJ/h

Take away heat:

The known slag generation of iii is 3.68kg/h, and slag specific heat capacity is 1.2kJ/ (kg* DEG C), supposes that slag temperature is 1400 DEG C, then slag takes away heat is 3.68*1.2*1400=6182.4kJ/h

Iv looks into physical parameter table and obtains solid slag to take away heat to molten slag be 3.68*1005.35=3699.69kJ/h

V supposes that the hot-face temperature of refractory materials inside cooling stave is 1400 DEG C, and known coolant water temperature is 30 DEG C, and refractory thickness is 70mm, and the heat transfer coefficient of resistance to material is 10.8kJ/ (m*h* DEG C), and between water and tube wall, convective heat-transfer coefficient is 8372kJ/ (m ²* h* DEG C)

Then heat flow rate per unit area is (1400-30)/(0.07/10.8+1/8372)=207607.21kJ/ (m ²* h)

Cooling area is 3.14*0.64*0.76=1.53m ²

The heat that cooling stave is taken away is 207607.21*1.53=317639.03kJ/h

Vi combustion reaction products is mainly CO ₂and the N brought in air ₂, the CO that reaction generates ₂for 250*0.21*1000/22.4=2343.75mol/h, the N brought in air ₂for 250*0.79*1000/22.4=8816.96mol/h

Before known response, air themperature is 200 DEG C, and after assumed response, gas temperature is 1400 DEG C, according to gas constant voltage alternating temperature process formula , after calculating reaction, gas takes away heat is 498764.78kJ/h.

Then altogether taking away heat in process of the test is 6182.4+3699.69+317639.03+498764.78=826285.9kJ/h.

In sum, bring heat > into and take away heat, whole process of the test can be carried out smoothly.

4. known enter stove air capacity be 250Nm ³/ h, air themperature is 200 DEG C, and air pressure is 0.7MPa, furnace pressure is 0.01MPa, and nozzle number is 4, nozzle inside diameter be 8mm(join at present emergingly minimumly can only accomplish this size), calculating nozzle line speed is 89m/s, and bringing computer program into, to calculate the sub-thread length of flame be 494mm.

(4) in the cooling tube of slag bath and water wall, suitable discharge is determined and the groping of refractory thickness and its cold and hot surface temperature variation relation.

Measure a cooling stave inner lining refractory thickness respectively afterwards before the test, according to Theoretical Calculation, the discharge preset in cooling stave cooling tube is 9m ³/ h, 0.5h measure the cold and hot surface temperature of the import and export temperature of cooling water of a cooling tube, the cold and hot surface temperature of inner lining refractory and cooling stave, the known heat transfer coefficient of resistance to material and convective heat-transfer coefficient between water and tube wall, the exactness that proof theory calculates.

By regulating the discharge in cooling stave cooling tube, the import and export temperature difference of water coolant can be remained on 5 DEG C (according to operation of blast furnace experience, this temperature difference is comparatively suitable), thus the desired flow of water coolant can be obtained, and instead can release refractory materials heating surface temperature by calculating.

In like manner, measure a slag bath inner lining refractory thickness respectively afterwards before the test, according to Theoretical Calculation, the discharge preset in slag bath cooling tube is 4m ³/ h, 0.5h measures the import and export temperature of cooling water of a cooling tube, by regulating the discharge in slag bath cooling tube, the import and export temperature difference of water coolant can be remained on 5 DEG C, thus the desired flow of water coolant can be obtained, and by calculating the slag temperature instead can releasing refractory materials heating surface.

After off-test, observe the damage situations of refractory materials inside cooling stave and slag bath, to its sampling of taking pictures, analyze its damage reason.

(5) determination of each layer material composition and raceway zone size composition in the overflow port size of overflow type slag bath and slag bath.

Just set the overflow port internal diameter of slag bath as 90mm, according to the deslagging situation of slag bath in process of the test, 70mm is contracted to overflow port internal diameter.

In order to measure the size composition of raceway zone, at the end of test is fast, logical nitrogen carries out unexpected blowing out, carries out screening measure size-grade distribution to raceway zone reactant, and technical analysis is carried out in sampling simultaneously.

After off-test, after melt cinder cooling in slag bath, stratified sampling is carried out to solid slag, and measure its composition.Meanwhile, observe bottom shock chamber whether have unconverted coal, technical analysis is carried out in sampling.Solid slag is weighed and sampling analysis, measures its carbon residue content.

(6) gas composition measurement is reflected and integral energy is accounted.

Utilize formula gas analyzer difficult to understand to measure gas composition after reaction, measure into stove air flow quantity and temperature thereof, gas flow after assaying reaction, according to the combustion zone temperature calculated and slag temperature, the integral energy carrying out Model test in heat state is accounted.

Step of the present invention is rigorous, coherent, for enterprise achieves valuable experimental data with minimum R&D costs, substantially increases the efficiency of Corporation R & D.

Claims (5)

1. a slag gasification furnace Model test in heat state method, comprises the steps:

Step 1. test raw material is chemically examined;

Step 2. hot-die device cold test;

The igniting of step 3. hot-die device;

The adjustment of step 4. hot-die device operational condition;

The hot test of step 5. hot-die device;

Step 6., at the end of test is fast, passes into nitrogen and carries out unexpected blowing out, carries out screening measure size-grade distribution to raceway zone reactant, and technical analysis is carried out in sampling simultaneously;

After step 7. off-test, after the melt cinder cooling in overflow type slag bath, stratified sampling is carried out to solid slag, and measure its composition;

After step 8. off-test, observe the damage situations of refractory materials inside vapourizing furnace cooling stave and slag bath, to its sampling of taking pictures, analyze its damage reason.

2. a kind of slag gasification furnace Model test in heat state method according to claim 1, is characterized in that: described

In step 2, hot-die device cold test comprises the steps:

1) before test, camera and light source are installed bottom vapourizing furnace shock chamber, close bottom shock chamber, open gasifier gas outlet valve;

2), in process of the test, keep into the maximum air capacity 250Nm of stove ³/ h, after entering stove air capacity and be stable, adds 10-20kg coal, opens vapourizing furnace coal bunker lower valve door, add in vapourizing furnace by coal in coal bunker in vapourizing furnace coal bunker;

3) pay close attention to from computer video and whether have coal to fall into shock chamber from vapourizing furnace slag bath overflow port, fall coal phenomenon not serious time, write down into stove air pressure and furnace pressure;

4) repeat to add the coal of equal in quality toward stove in, observation vapourizing furnace overflow port state, and write down as-fired coal accumulated quality, enter stove air pressure and furnace pressure.

3. a kind of slag gasification furnace Model test in heat state method according to any one of claim 1, is characterized in that: in described step 3, the igniting of hot-die device comprises the steps:

1) before the test, vapourizing furnace slag bath overflow port is covered with plank;

2) with ready solvent or diluent and cotton yarn, charcoal is ignited outside stove, after charcoal all burns, be poured in vapourizing furnace from vapourizing furnace manhole;

3) add ready charcoal and raw coal, blowing air in vapourizing furnace, air capacity controls at 10Nm ³/ h, seals vapourizing furnace manhole;

4) observe stove combustion situation from the peep hole that gasifying furnace nozzle is other, and pay close attention to Temperature displaying and the temperature out display of refractory materials heating surface, slowly toward coal in stove from raw material cabin, strengthen into stove air capacity simultaneously; When refractory materials heating surface displays temperature reaches 1000 DEG C, in vapourizing furnace, fill it up with coal, stove air capacity will be entered simultaneously and be transferred to trial value, start the collection of testing data.

4. a kind of slag gasification furnace Model test in heat state method according to any one of claim 1-3, it is characterized in that: in described step 5, the hot test of hot-die device comprises, the determination of the determination of best water flow amount in the cooling tube of overflow type slag bath and water wall, refractory thickness and its cold and hot surface temperature variation relation, reflect accounting of gas composition measurement and integral energy.

5. a kind of slag gasification furnace Model test in heat state method according to claim 4, is characterized in that: described overflow type slag bath and the interior suitable discharge of the cooling tube of water wall are determined to comprise the steps:

1) measure a cooling stave inner lining refractory thickness respectively afterwards before the test, according to Theoretical Calculation, the discharge preset in cooling stave cooling tube is 9m ³/ h, 0.5h measure the cold and hot surface temperature of the import and export temperature of cooling water of a cooling tube, the cold and hot surface temperature of inner lining refractory and cooling stave, the known heat transfer coefficient of resistance to material and convective heat-transfer coefficient between water and tube wall, the exactness that proof theory calculates;

2) by regulating the discharge in cooling stave cooling tube, the import and export temperature difference of water coolant can be remained on 5 DEG C, thus the desired flow of water coolant can be obtained, and instead can release refractory materials heating surface temperature by calculating.