CN104845674A - Furnace steam volume decreasing semi-water gas production process - Google Patents
Furnace steam volume decreasing semi-water gas production process Download PDFInfo
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- CN104845674A CN104845674A CN201510201157.5A CN201510201157A CN104845674A CN 104845674 A CN104845674 A CN 104845674A CN 201510201157 A CN201510201157 A CN 201510201157A CN 104845674 A CN104845674 A CN 104845674A
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Abstract
The invention discloses a furnace steam volume decreasing semi-water gas production process. Through continuous circulation of a blowing phase, an upward blowing phase, a downward blowing phase, a secondary upward blowing phase and a scavenging phase, semi-water gas preparation can be finished in the furnace. A general regulating valve and a steam main valve are used cooperatively, a high temperature sleeve valve with equal percent characteristics is selected, and according to gas making working conditions, automatic linear decreasing of steam during upward and downward blowing gas making can be realized, the operation is easy, and the performance is reliable. As an auxiliary line is added in a regulation loop, the minimum steam flow of safe upward blowing can be adjusted, and continuous production and repair under fault conditions can be ensured. In addition, the regulation loop and the steam main valve are connected in series for use, so that upward blowing and downward blowing steam decreasing, downward blowing steam decreasing or upward blowing steam decreasing can be realized only by setting parameters, and all forms of steam decreasing can be achieved by one hardware configuration.
Description
Technical field
The present invention relates to a kind of enter the stove vapor volume semi-water gas production technique of successively decreasing.
Background technology
The preparation of semi-water gas has been a very ripe technique, and Application comparison is adopt batch-type gas making furnace Cyclic Gas-making widely, wherein the temperature of gasification layer and thickness is Gas-making Furnace steady running, gas production rate is large, gaseous constituent is qualified deciding factor.Usually, gasification temperature controls to fluctuate in less scope, temperature is too high, easily make gasification layer temperature exceed coal seam ash fusion point, easily cause lime-ash to lump, caking coal grain, increase stove internal resistance, affect high temperature coal being uniformly distributed in gasification layer, the gasification unusual phenomenon that can form channeling, the inclination of charcoal fire layer at short notice or burn, makes the working of a furnace worsen.When gasification layer temperature controls lower, gasification chemical reaction velocity slows down, and gasification intensity reduces, and gas production rate reduces, and steam decomposition rate is low, and in lime-ash, remaining carbon increases, and gas quality is deteriorated.Conventional regulating measure mainly by controlling blowing total amount (blow-time, blow strength) or its furnace temperature of steam in the boiler overall control, regulates the working of a furnace.Air output is more, and gasification layer temperature is higher, and Gas-making Furnace accumulation of heat is more.Pass into steam when decomposing, accumulation of heat is more, and temperature is higher, and its rate of decomposition is higher.Along with the steam supply time increases, gasification layer temperature is more and more lower, if now quantity of steam or with the same flow of beginning, in gas later stage processed gasification layer temperature reduction, then have some vapor not decompose in time, undecomposed vapor zone walks the amount of heat in gasification layer, gasification layer temperature sharply declines, and steam decomposition rate decreases, and factor of created gase also reduces greatly, because temperature is low, in coal gas, available gas composition also declines thereupon.In the process that simultaneously excessive steam makes gasification layer decline, make part coal particles be down to below temperature of reaction, in time and steam and air reaction and be brought into ash bed, thus consumption can not be increased.Enter for solving steam preferably the contradiction that stove later stage rate of decomposition sharply reduces, many producers adopted a lot of mode automatically to regulate steam in the boiler, but due to the imperfection of control method or the type selecting limitation of control device, caused effect all little desirable.
Generally, more excess steam is had in gas making steam in the boiler.Along with steam passes into the growth of time, the heat taken away in stove increases, and furnace temperature declines rapidly, and steam decomposition rate sharply reduces, and undecomposed steam takes away amount of heat, causes steam or heat utilization efficiency not high, waste mass energy.
Summary of the invention
The object of the invention is there is more excess steam in the steam in the boiler for solving in the production of current semi-water gas, along with steam passes into the growth of time, the heat taken away in stove increases, furnace temperature declines rapidly, steam decomposition rate sharply reduces, undecomposed steam takes away amount of heat, cause steam or heat utilization efficiency not high, waste mass energy, and gasification chemical reaction velocity slows down, gasification intensity reduces, gas production rate reduces, steam decomposition rate is low, and in lime-ash, remaining carbon increases, the technical problem that gas quality is deteriorated.
In order to solve the problems of the technologies described above, the invention provides a kind of enter the stove vapor volume semi-water gas production technique of successively decreasing, comprise the steps:
(1) dry the stage: be blown into carbon in enough air and stove from furnace bottom and react, generate carbonic acid gas, release amount of heat, gasification layer temperature is raised, accumulation of heat;
(2) in the blowing up stage: pass into steam blowing, steam enters steam regulating loop through steaming main valve, then enters in stove through upper blowing valve from bottom of furnace body, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; Described steam regulating loop is connected with steaming main valve, and steam regulating loop comprises automatic regulating valve, and automatic regulating valve is the high temperature sleeves valve with equal percentage characteristics; When just having entered blowing up step sequence, automatic regulating valve aperture has been left to blowing up capping Z1, after maintaining certain time interval T 1, reduce aperture with certain speed V1, steam decrement supplies, and opens to blowing up preset lower limit Z2 to automatic regulating valve aperture, locking exports, and realizes later stage steam and supplies on a small quantity;
(3) the blowing down stage: rise too much for preventing gasification layer, after blowing up terminates, pass into lower steam blowing and carry out blowing down process, steam enters steam regulating loop through steaming main valve, enter in stove through blowing down valve from body of heater top again, gasification layer constantly moves down, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; When just having entered blowing down step sequence, automatic regulating valve aperture has been left to blowing down capping Z3, after maintaining certain time interval T 3, reduce aperture with certain speed V2, steam decrement supplies, and opens to blowing down preset lower limit Z4 to automatic regulating valve aperture, locking exports, and realizes later stage steam and supplies on a small quantity;
(4) the secondary blowing up stage: again pass into the blowing up flow process that steam blowing carries out the short period of time, with steam by clean for the displacement of furnace bottom pipeline;
(5) stage is blown off: air enters body of heater through blowing valve having, the residual gas in recovery channel.
Further, described automatic regulating valve is pneumatic or electronic.
Further, described steam regulating loop also comprises the manual modulation valve in parallel with described automatic regulating valve.
Further, described automatic regulating valve is positive interaction valve.
Further, the one-way trip time of described automatic regulating valve is less than 12s.
Further, the sharpness of regulation of described automatic regulating valve is 1%.
Beneficial effect of the present invention is: (1) adopts general variable valve, does not need to customize professional valve, and type selecting wide ranges, versatility is good.(2) regulation valve core selects the high temperature sleeves valve of equal percentage characteristics, and revolutionize the weakness of traditional slide valve Flow-rate adjustment inequality, adjustment is had more linearly, and regulating effect is better.(3) regulating loop possesses by-pass and regulates, and by-pass part can guarantee minimum safe blowing up steam consumption, and meanwhile, main line part divides when breaking down, and manually regulates by-pass part, can ensure continuous seepage, also can keep in repair main line simultaneously.In traditional regulation method, without by-pass part, main line ensures minimum safe blowing up steam flow by mechanical position limitation, as variable valve break down time, System steam cannot regulate in time, has a strong impact on production, simultaneously, maintenance intervention valve must just can carry out by system shutdown, and the continuity of production can not get ensureing.(4) regulating loop is connected with steam main valve and is used, so linear regulation can be carried out to the steam flow of blowing up, blowing down and even all technique step sequence section simultaneously, only need by changing parameter setting in sequence of control, arbitrary control mode can be selected, comprise and one, two even multiple sequential sections are controlled, do not need the process station changing regulating loop, save cost, simple to operate.Usually different regulative modes is realized with the process station changing regulating loop in conventional art.
Accompanying drawing explanation
Fig. 1 is gas production process principle figure of the present invention.
Fig. 2 is blowing up of the present invention and blowing down stage control software flow pattern.
In figure: 1 body of heater; 2 steam main valve; 3 blowing valve havings; 4 upper blowing valves; 5 blowing down valves; 6 up valves; 7 descending valves; 8 coal main valves; 9 chimney valves; 10 recovery valves; 11 chimneys; KV1 automatic regulating valve; KT1 manual modulation valve.
Embodiment
The present invention is further detailed explanation in conjunction with the accompanying drawings and embodiments now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention, and it should not be construed as limitation of the present invention.
As shown in Figure 1-2, for Batch gas-production device relatively more universal at present, its technical process is described.
This device Main Function produces semi-water gas, and as seen from Figure 1, its chief component is body of heater 1, pipeline and valve, and its raw material has the coal in steam, air and body of heater 1, and its main thermal chemical reaction is:
Heat release during blowing: C+O
2=CO
2+ Q
12C+O
2=2CO+Q
2
Absorb heat during steam pyrolytic decomposition: C+CO
2=2CO-Q
3c+H
2o=CO+H
2-Q
4
C+H
2O＝CO+H
2－Q
5CO+H
2O＝CO
2+H
2－Q
6
In addition, due to the pyrolysis of decomposition organic in coal and coal, generating portion CH
4, H
2the product such as S, tar.
The main process (being called for short step sequence) producing semi-water gas is as follows:
(1) dry the stage: bottom body of heater 1, be blown into enough air or oxygen react with carbon in stove, generation carbonic acid gas, releasing amount of heat, makes gasification layer temperature raise, accumulation of heat.Be specially: air enters body of heater through blowing valve having 3 after blower fan pressurization, reacts, exhaust wherein oxygen with layer of charcoal hot in body of heater, generate carbonic acid gas, remain a large amount of nitrogen simultaneously, also have part Yin Gaowen to cause carbon dioxide reduction to become part carbon monoxide, also have the gases such as a small amount of methane simultaneously.The Main Function of blowing is intensification, accumulation of heat, its gas product can by after up valve 6 and chimney valve 9 through chimney 11 emptying, also can enter three wastes boiler through recovery valve 10 again to utilize, meanwhile, also can through coal main valve 8 by workshop section after the gas feedings such as a large amount of nitrogen, methane and carbonic acid gas.
(2) in the blowing up stage: pass into steam blowing, steam enters steam regulating loop through steaming main valve 2, then enters in stove through upper blowing valve 4 bottom body of heater 1, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; Steam regulating loop is connected with steaming main valve 2, and steam regulating loop comprises automatic regulating valve KV1, and automatic regulating valve KV1 is the high temperature sleeves valve with equal percentage characteristics; When just having entered blowing up step sequence, automatic regulating valve KV1 aperture has been left to blowing up capping Z1, after maintaining certain time interval T 1, reduce aperture with certain speed V1, steam decrement supplies, and opens to blowing up preset lower limit Z2 to automatic regulating valve KV1 aperture, locking exports, and realizes later stage steam and supplies on a small quantity; Automatic regulating valve KV1 is the pneumatic of positive interaction or motor-driven control valve, and the one-way trip time is less than 12s, and sharpness of regulation is 1%.
(3) the blowing down stage: rise too much for preventing gasification layer, after blowing up terminates, pass into lower steam blowing and carry out blowing down process, steam enters steam regulating loop through steaming main valve 2, enter in stove through blowing down valve 5 from body of heater 1 top again, gasification layer constantly moves down, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; When just having entered blowing down step sequence, automatic regulating valve KV1 aperture has been left to blowing down capping Z3, after maintaining certain time interval T 3, reduce aperture with certain speed V2, steam decrement supplies, and opens to blowing down preset lower limit Z4 to automatic regulating valve KV1 aperture, locking exports, and realizes later stage steam and supplies on a small quantity.
(4) the secondary blowing up stage: because after experiencing blowing up and the thermo-negative reaction in two stages of blowing down, gasification layer temperature is very low, for guaranteeing Cyclic Gas-making, need again to blow step sequence, to increase reaction institute heat requirement, but when blowing down completes, in body of heater 1 bottom pipe, be full of semi-water gas, if directly blown, will blast after air adds furnace bottom pipeline.So, for guaranteeing safety, needing with steam by clean for the displacement of furnace bottom pipeline, thus again carrying out the blowing up flow process of short period of time, also claiming secondary blowing up.
(5) blow off the stage: after carrying out secondary blowing up, furnace bottom is full of water vapor, now passing into air can carry out intensification flow process, is specially: air enters body of heater 1 through blowing valve having 3, workshop section after up valve 6, coal main valve 8 enter.Blowing off step sequence Main Function is residual gas in recovery channel.
Again blow intensification, get back to blowing step sequence, thus realize Cyclic Gas-making.
Steam main valve 2, upper blowing valve 4, blowing down valve 5, blowing valve having 3 etc. and be sequencing valve, the increase part of successively decreasing in regulation scheme about steam in the boiler in Fig. 1 we be referred to as regulating loop, form primarily of main line in figure (automatic regulating valve KV1 and front and back stopping valve), by-pass (manual valve KT1) and pipeline thereof.Wherein:
Manual modulation valve KT1: by-pass can be worked as during manual modulation valve standard-sized sheet and use, guarantee security of system, meanwhile, the manually minimum steam flow of variable valve also needed for adjustable systems, make motor-driven control valve KV1 in main line obtain maximum regulation domain, thus ensure best setting effect.
Gas/electronic automatic regulating valve KV1: be mainly used in regulating steam in the boiler flow in real time, guaranteed that the upper blowing down stage realized linear steam and successively decreases.
As seen from Figure 1, whole regulating loop is connected with steaming main valve 2, therefore, performs different regulating parameter by automatic regulating valve KV1 in different steps, and the different steam consumptions in can realize blowing up stage, blowing down stage even secondary blowing up stage regulate.
In Fig. 1, automatic regulating valve KV1 is that superheated vapour or saturation steam regulate because of what participate in, and require that flow realizes equal percentage and controls, so the high temperature sleeves valve of type selecting equal percentage characteristics, according to process characteristic, select positive interaction air to close or electric pass formula valve, be equipped with general topworks (pneumatic, electronic or surge) according to field condition.
For the program fill order cycle, program first checks whether as automatic control mode, if so, performs follow-up judgement, and if not automatic mode, valve does not participate in automatic adjustment, and export fixing aperture, this aperture can preset, and is parameter Z5 in figure.
If have selected automatic control, then judge it is which step sequence, if the blowing up stage, then carry out subsequent control, if not, judge whether the blowing down stage, if not, current is other step sequences, aperture upper limit Z1 during valve output blowing up.
If blowing up step sequence or blowing down step sequence, that is variable valve will carry out corresponding adjustment, and as can be seen from Figure 2, blowing up step sequence walks sequence regulative mode with blowing down and flow process is consistent, is only that controling parameters is different, and therefore, we only comprehensively analyze blowing up step sequence wherein.
After being confirmed to be the blowing up stage, judge the step sequence time again, because we carry out steam in the boiler self-regulated is carry out when the step sequence later stage, gasification layer temperature was lower, so, having carried out blowing up regulates initial time T1 to arrange, and when the step sequence time is greater than T1, can regulate, when being less than or equal to T1, aperture upper limit Z1 when valve opening maintains blowing up.
When the step sequence time is greater than blowing up adjustment initial time T1, then judge whether to be greater than the maximum time T2 allowing to regulate, when the setting of T2 is mainly in order to consider that step sequence switches, the time needed for valve event.If the current step sequence time is greater than T2, means and be about to enter blowing down step sequence, then valve opening upper limit Z3 during valve execution blowing down.
If the current step sequence time is greater than T1 and is less than T2, automatic regulating valve KV1 carries out the adjustment of blowing up stage, valve output aperture is now continuous linear decrease along with the increase of regulating time n, that is the speed of actions V1 of variable valve during the control valve opening upper limit Z1-regulating time n* blowing up during output Z=blowing up of valve, V1 refers to variable valve with what speed regulates.
When we calculate automatic regulating valve KV1 when the output valve in blowing up stage according to regulating time n, when finally also should judge whether this output valve is greater than blowing up, automatic regulating valve KV1 aperture lower limit Z2, if be less than Z2, maintains output valve, otherwise, then export Z2 aperture.
To sum up opinion, the aperture of variable valve confirms first need judgement to be manual regulation or automatically regulate, and then judges it is what step sequence, then judges whether in permission regulating time, finally judges valve output valve whether within the scope of the bound of permission.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to right.
Claims (6)
1. enter the semi-water gas production technique that stove vapor volume successively decreases, it is characterized in that, comprise the steps:
(1) dry the stage: be blown into carbon in enough air and stove from furnace bottom and react, generate carbonic acid gas, release amount of heat, gasification layer temperature is raised, accumulation of heat;
(2) in the blowing up stage: pass into steam blowing, steam enters steam regulating loop through steaming main valve, then enters in stove through upper blowing valve from bottom of furnace body, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; Described steam regulating loop is connected with steaming main valve, and steam regulating loop comprises automatic regulating valve, and automatic regulating valve is the high temperature sleeves valve with equal percentage characteristics; When just having entered blowing up step sequence, automatic regulating valve aperture has been left to blowing up capping Z1, after maintaining certain time interval T 1, reduce aperture with certain speed V1, steam decrement supplies, and opens to blowing up preset lower limit Z2 to automatic regulating valve aperture, locking exports, and realizes later stage steam and supplies on a small quantity;
(3) the blowing down stage: rise too much for preventing gasification layer, after blowing up terminates, pass into lower steam blowing and carry out blowing down process, steam enters steam regulating loop through steaming main valve, enter in stove through blowing down valve from body of heater top again, gasification layer constantly moves down, and steam enters gasification layer and carries out pyrolytic decomposition, generates hydrogen and carbon monoxide; When just having entered blowing down step sequence, automatic regulating valve aperture has been left to blowing down capping Z3, after maintaining certain time interval T 3, reduce aperture with certain speed V2, steam decrement supplies, and opens to blowing down preset lower limit Z4 to automatic regulating valve aperture, locking exports, and realizes later stage steam and supplies on a small quantity;
(4) the secondary blowing up stage: again pass into the blowing up flow process that steam blowing carries out the short period of time, with steam by clean for the displacement of furnace bottom pipeline;
(5) stage is blown off: air enters body of heater through blowing valve having, the residual gas in recovery channel.
2. according to claim 1 enter the stove vapor volume semi-water gas production technique of successively decreasing, it is characterized in that, described automatic regulating valve is pneumatic or electronic.
3. according to claim 1 and 2 enter the stove vapor volume semi-water gas production technique of successively decreasing, it is characterized in that, described steam regulating loop also comprises the manual modulation valve in parallel with described automatic regulating valve.
4. according to claim 3 enter the stove vapor volume semi-water gas production technique of successively decreasing, it is characterized in that, described automatic regulating valve is positive interaction valve.
5. according to claim 1 enter the stove vapor volume semi-water gas production technique of successively decreasing, it is characterized in that, the one-way trip time of described automatic regulating valve is less than 12s.
6. according to claim 1 enter the stove vapor volume semi-water gas production technique of successively decreasing, it is characterized in that, the sharpness of regulation of described automatic regulating valve is 1%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106190316A (en) * | 2016-08-25 | 2016-12-07 | 湖北三宁化工股份有限公司 | A kind of reduction fixed-bed intermittent formula gasification furnace blowing-out gas effective ingredient (CO+H2) method and apparatus of content |
| CN114106888A (en) * | 2021-11-22 | 2022-03-01 | 安徽晋煤中能化工股份有限公司 | Automatic optimization device for steam entering gas furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106190316A (en) * | 2016-08-25 | 2016-12-07 | 湖北三宁化工股份有限公司 | A kind of reduction fixed-bed intermittent formula gasification furnace blowing-out gas effective ingredient (CO+H2) method and apparatus of content |
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Application publication date: 20150819 |