WO2015016327A1 - コークス乾式消火装置及びコークス乾式消火方法 - Google Patents
コークス乾式消火装置及びコークス乾式消火方法 Download PDFInfo
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- WO2015016327A1 WO2015016327A1 PCT/JP2014/070266 JP2014070266W WO2015016327A1 WO 2015016327 A1 WO2015016327 A1 WO 2015016327A1 JP 2014070266 W JP2014070266 W JP 2014070266W WO 2015016327 A1 WO2015016327 A1 WO 2015016327A1
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- WIPO (PCT)
- Prior art keywords
- gas
- flow rate
- line
- boiler
- bypass
- Prior art date
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- 239000000571 coke Substances 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims description 25
- 238000010791 quenching Methods 0.000 title abstract 3
- 239000007789 gas Substances 0.000 claims abstract description 417
- 238000009792 diffusion process Methods 0.000 claims abstract description 52
- 239000000112 cooling gas Substances 0.000 claims abstract description 44
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 21
- 238000013459 approach Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims description 56
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 abstract 4
- 238000007599 discharging Methods 0.000 description 14
- 230000006641 stabilisation Effects 0.000 description 11
- 238000011105 stabilization Methods 0.000 description 11
- 230000000087 stabilizing effect Effects 0.000 description 9
- 239000000428 dust Substances 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Definitions
- the present invention relates to a coke dry fire extinguishing apparatus and a coke dry fire extinguishing method.
- a coke dry fire extinguishing device is known as a device for cooling red hot coke discharged from a coke oven.
- the coke dry fire extinguishing device include a cooling chamber, a boiler, first and second gas lines, a bypass line, a diffusion line, and an auxiliary gas line.
- the cooling chamber receives red hot coke, cools it with a cooling gas, and discharges it.
- the boiler recovers energy from the heat generated by the red hot coke.
- the first gas line guides the cooling gas that has passed through the coke in the cooling chamber to the boiler.
- the second gas line guides the cooling gas that has passed through the boiler to the cooling chamber.
- the bypass line lowers the gas temperature of the first gas line by guiding a part of the cooling gas passing through the second gas line to the first gas line without passing through the cooling chamber.
- the diffusion line adjusts the pressure in the pre-chamber by introducing a part of the cooling gas passing through the second gas line to the outside.
- the auxiliary gas line raises the gas temperature of the first gas line by guiding the combustion auxiliary gas containing oxygen to the first gas line.
- ⁇ Coke dry fire extinguishing equipment is required to reliably cool red hot coke and generate an appropriate amount of steam from the boiler. Furthermore, it is also required to suppress an increase in the CO concentration in the cooling gas while keeping the gas temperature of the first gas line at a constant value.
- the operator can set the temperature of the coke discharged from the cooling chamber (hereinafter referred to as “discharge coke temperature”), the gas temperature of the first gas line (hereinafter referred to as “gas temperature before boiler”). It is necessary to monitor and adjust the CO concentration of the cooling gas (hereinafter referred to as “CO concentration”) and the amount of steam generated by the boiler (hereinafter referred to as “steam generation amount”). .
- these parameters include, for example, the gas flow rate upstream of the blower in the second gas line (hereinafter referred to as “circulation flow rate”), the gas flow rate in the bypass line (hereinafter referred to as “bypass flow rate”), and the auxiliary gas line.
- This is achieved by appropriately adjusting the gas flow rate (hereinafter referred to as “auxiliary gas flow rate”), the gas flow rate in the diffusion line (hereinafter referred to as “discharge flow rate”), and the like.
- auxiliary gas flow rate the gas flow rate in the diffusion line
- discharge flow rate the gas flow rate in the diffusion line
- Some of these flow rates affect more than one parameter.
- the circulation flow rate affects the discharged coke temperature and the amount of steam generated.
- the bypass flow rate affects the gas temperature before the boiler and the circulation flow rate, that is, the discharged coke temperature and the amount of steam generated.
- Patent Document 1 discloses a method for automatically controlling the dilution air amount (auxiliary gas flow rate) and the circulation gas flow rate (circulation flow rate).
- the auxiliary gas flow rate is determined based on the amount of coke discharged from the cooling chamber (hereinafter referred to as “coke discharge”), but the auxiliary gas is supplied for the purpose of adjusting the CO concentration.
- CO concentration fluctuates due to various factors other than the amount of coke discharged. For this reason, it is necessary to monitor the CO concentration and manually adjust the auxiliary gas flow rate according to the fluctuation. Adjustment of the auxiliary gas flow rate also affects the gas temperature before the boiler and the amount of steam generated.
- an object of the present invention is to provide a coke dry fire extinguishing apparatus and a coke dry fire extinguishing method that can reduce the burden on the operator.
- a coke dry fire extinguishing apparatus receives a red hot coke, cools it with a cooling gas and discharges it, a boiler for recovering energy from the heat generated by the red hot coke, and a cooling chamber
- a bypass line for guiding a part of the gas to the first gas line without passing through the cooling chamber, a diffusion line for guiding a part of the cooling gas passing through the second gas line to the outside, and the bypass line and the diffusion line.
- a circulation flow meter for detecting the gas flow rate of the second gas line on the upstream side, a circulation flow rate adjusting unit for adjusting the gas flow rate, and a bypass A bypass flow meter for detecting the gas flow rate of the in-flow, a bypass flow rate adjusting unit for adjusting the gas flow rate, a diffusion flow meter for detecting the gas flow rate of the diffusion line, a diffusion flow rate adjusting unit for adjusting the gas flow rate, and a circulation flow meter Calculate the chamber inlet flow rate by subtracting the flow rate detected by the bypass flow meter and the diffusion flow meter from the flow rate detected by the above, and the ratio of the coke discharge amount from the cooling chamber to the chamber inlet flow rate approaches the target ratio.
- the inlet flow rate control unit that controls the circulation flow rate adjustment unit or the diffused flow rate adjustment unit.
- the circulating flow rate adjusting unit or the diffused flow rate adjusting unit is controlled so that the ratio of the coke discharge amount and the chamber inlet flow rate approaches the target ratio.
- the amount of the cooling gas is automatically adjusted according to the increase or decrease of the coke to be cooled, so that the discharged coke temperature is automatically adjusted. That is, since at least one of the parameters is automatically adjusted, the burden on the operator can be reduced.
- stabilization of the discharged coke temperature is also expected. By stabilizing the discharged coke temperature, the life of the apparatus for discharging and transporting the cooled coke can be improved. For example, burnout or deterioration of the conveyor belt for discharging coke can be prevented.
- the inlet flow rate control unit calculates the chamber inlet flow rate by subtracting the bypass flow rate and the diffusion flow rate from the circulation flow rate. This also contributes to the realization of automatic adjustment of the discharged coke temperature.
- a pre-boiler gas thermometer to be detected and a gas temperature control unit that controls the bypass flow rate adjusting unit or the auxiliary gas flow rate adjusting unit so that the pre-boiler gas temperature approaches the target temperature may be further provided.
- the bypass flow rate adjusting unit or the auxiliary gas flow rate adjusting unit is controlled by the gas temperature control unit so that the pre-boiler gas temperature approaches the target temperature, the pre-boiler gas temperature is automatically adjusted.
- the chamber inlet flow rate is automatically adjusted by the inlet flow rate control unit, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed. That is, since the chamber inlet flow rate and the pre-boiler gas temperature, which are at least two of the above parameters, are automatically adjusted, the burden on the operator can be further reduced. Furthermore, compared with performing manual adjustment, stabilization of the gas temperature before the boiler is also expected. By stabilizing the gas temperature before the boiler, the life of the boiler can be improved. For example, breakage or deterioration of the boiler tube can be prevented.
- the gas temperature control unit increases the gas flow rate of the bypass line by controlling the bypass flow rate adjusting unit and decreases the gas flow rate of the auxiliary gas line by controlling the auxiliary gas flow rate adjusting unit. If the gas temperature before the boiler is lower than the target temperature, decrease the gas flow rate in the bypass line by controlling the bypass flow rate adjusting unit and increase the gas flow rate in the auxiliary gas line by controlling the auxiliary gas flow rate adjusting unit You may perform at least one of these.
- the bypass flow rate is increased, the gas temperature before the boiler is lowered.
- the auxiliary gas flow rate is increased, the gas temperature before the boiler rises.
- the gas temperature before the boiler when the gas temperature before the boiler is higher than the target temperature, the gas temperature before the boiler can be lowered by performing at least one of increasing the bypass flow rate and decreasing the auxiliary gas flow rate.
- the pre-boiler gas temperature when the pre-boiler gas temperature is lower than the target temperature, the pre-boiler gas temperature can be increased by performing at least one of a decrease in the bypass flow rate and an increase in the auxiliary gas flow rate. Therefore, the gas temperature before the boiler can be brought closer to the target temperature more reliably. Thereby, the further stabilization of the gas temperature before a boiler is anticipated.
- a CO concentration meter for detecting the CO concentration of the cooling gas is further provided, and the gas temperature control unit increases the gas flow rate of the auxiliary gas line and increases the gas flow rate of the bypass line as the CO concentration increases.
- the bypass flow rate adjustment unit and the auxiliary gas flow rate adjustment unit may be controlled. In this case, since the auxiliary gas flow rate is increased as the CO concentration increases, the CO concentration is reduced. Since the bypass flow rate is increased with the increase of the auxiliary gas flow rate, the influence of the increase of the auxiliary gas flow rate on the pre-boiler gas temperature is negated. Thereby, the adjustment of the gas temperature before the boiler is continued without being affected by the adjustment of the CO concentration.
- the chamber inlet flow rate is automatically adjusted by the inlet flow rate control unit, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed. That is, since the chamber inlet flow rate, the pre-boiler gas temperature, and the CO concentration which are at least three of the above parameters are automatically adjusted, the burden on the operator can be further reduced. Furthermore, stabilization of the CO concentration that is unburned is also expected. By stabilizing the CO concentration, it is possible to recover sensible heat more efficiently.
- a steam flow meter for detecting the amount of steam generated from the boiler is further provided, and the gas temperature control unit is configured to reduce the gas flow rate of the auxiliary gas line when the amount of steam generated is larger than the target amount. While controlling the above, it may wait until the steam generation amount becomes smaller than the target amount. In this case, in addition to the adjustment of the chamber inlet flow rate and the pre-boiler gas temperature, the steam generation amount is further adjusted. That is, since at least three of the above parameters are automatically adjusted, the burden on the operator can be further reduced.
- the gas temperature control unit waits for the steam generation amount to become smaller than the target amount, so the steam generation amount is adjusted in preference to the adjustment of the gas temperature before the boiler. The For this reason, damage to the turbine driven by steam can be prevented more reliably. Further, since the auxiliary gas flow rate is reduced, the generation of heat in the front stage of the boiler is reliably suppressed, and the amount of steam generated can be rapidly reduced.
- a coke dry fire extinguishing method includes a cooling chamber for receiving red hot coke, cooling it with a cooling gas and discharging it, a boiler for recovering energy from the heat generated by the red hot coke, and the cooling chamber.
- a control unit of an apparatus comprising: a bypass line that guides a part of the gas to the first gas line without passing through the cooling chamber; and a diffusion line that guides a part of the cooling gas that passes through the second gas line to the outside
- a coke dry fire extinguishing method implemented by circulates the gas flow rate of the second gas line upstream of the bypass line and the diffusion line Obtained as a quantity, the gas flow rate of the bypass line is obtained as a bypass flow rate, the gas flow rate of the diffusion line is obtained as a diffused flow rate, the bypass flow
- the circulation flow rate or the discharge flow rate is adjusted so that the ratio between the coke discharge amount and the chamber inlet flow rate approaches the target ratio.
- the amount of the cooling gas is automatically adjusted according to the increase or decrease of the coke to be cooled, so that the discharged coke temperature is automatically adjusted. That is, since at least one of the parameters is automatically adjusted, the burden on the operator can be reduced.
- stabilization of the discharged coke temperature is also expected. By stabilizing the discharged coke temperature, the life of the apparatus for discharging and transporting the cooled coke can be improved. For example, burnout or deterioration of the conveyor belt for discharging coke can be prevented.
- the chamber inlet flow rate is calculated by subtracting the bypass flow rate and the diffusion flow rate from the circulation flow rate. This also contributes to the realization of automatic adjustment of the discharged coke temperature.
- the gas flow rates of the bypass line and the auxiliary gas line may be further adjusted.
- the pre-boiler gas temperature is automatically adjusted.
- the chamber inlet flow rate is automatically adjusted, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed.
- the chamber inlet flow rate and the pre-boiler gas temperature which are at least two of the above parameters, are automatically adjusted, the burden on the operator can be further reduced. Furthermore, compared with performing manual adjustment, stabilization of the gas temperature before the boiler is also expected. By stabilizing the gas temperature before the boiler, the life of the boiler can be improved. For example, breakage or deterioration of the boiler tube can be prevented.
- the gas temperature before the boiler is higher than the target temperature
- at least one of increasing the gas flow rate of the bypass line and decreasing the gas flow rate of the auxiliary gas line is performed.
- the bypass line The reduction of the gas flow rate and the increase of the gas flow rate of the auxiliary gas line may be performed.
- the bypass flow rate is increased, the gas temperature before the boiler is lowered.
- the auxiliary gas flow rate is increased, the gas temperature before the boiler rises. For this reason, when the gas temperature before the boiler is higher than the target temperature, the gas temperature before the boiler can be lowered by performing at least one of increasing the bypass flow rate and decreasing the auxiliary gas flow rate.
- the pre-boiler gas temperature When the pre-boiler gas temperature is lower than the target temperature, the pre-boiler gas temperature can be increased by performing at least one of a decrease in the bypass flow rate and an increase in the auxiliary gas flow rate. Therefore, the gas temperature before the boiler can be brought closer to the target temperature more reliably. Thereby, the further stabilization of the gas temperature before a boiler is anticipated.
- the CO concentration of the cooling gas may be further acquired, and the gas flow rate of the auxiliary gas line may be increased and the gas flow rate of the bypass line may be increased as the CO concentration increases.
- the auxiliary gas flow rate is increased as the CO concentration increases, the CO concentration is reduced.
- the bypass flow rate is increased with the increase of the auxiliary gas flow rate, the influence of the increase of the auxiliary gas flow rate on the pre-boiler gas temperature is negated. Thereby, the adjustment of the gas temperature before the boiler is continued without being affected by the adjustment of the CO concentration.
- the chamber inlet flow rate is automatically adjusted, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed.
- the chamber inlet flow rate, the pre-boiler gas temperature, and the CO concentration which are at least three of the above parameters, are automatically adjusted, the burden on the operator can be further reduced. Furthermore, stabilization of the CO concentration that is unburned is also expected. By stabilizing the CO concentration, it is possible to recover sensible heat more efficiently.
- the gas flow in the auxiliary gas line is reduced to wait for the amount of steam generated to become smaller than the target amount, and steam generation
- the gas flow rate in the bypass line and the auxiliary gas line may be adjusted to bring the gas temperature before the boiler closer to the target temperature.
- the steam generation amount is further adjusted. That is, since at least three of the above parameters are automatically adjusted, the burden on the operator can be further reduced.
- the steam generation amount is adjusted in preference to the adjustment of the pre-boiler gas temperature. For this reason, damage to the turbine driven by steam can be prevented more reliably. Further, when the steam generation amount is larger than the target amount, the auxiliary gas flow rate is reduced, so that heat generation in the front stage of the boiler is reliably suppressed, and the steam generation amount can be quickly reduced.
- the burden on the operator can be reduced.
- the coke dry fire extinguishing apparatus 1 includes a cooling chamber 2, a boiler 3, pipes 4 and 5, a bypass pipe 6, a gas diffusion pipe 7, an auxiliary gas supply pipe 8, and a control unit 10. With.
- the coke dry fire extinguishing apparatus 1 is an apparatus that cools red hot coke discharged from a coke oven.
- the cooling chamber 2 has a coke receiving part 2a, a coke discharging part 2b, a slowing flue part 2c, and a gas blowing part 2d.
- the coke receiving part 2a is provided in the upper part of the cooling chamber 2, and receives red hot coke.
- the coke discharging unit 2 b is provided at the lower part of the cooling chamber 2 and sends out coke in the cooling chamber 2.
- a coke discharging mechanism 20 is provided in the coke discharging unit 2b.
- the coke discharging mechanism 20 includes, for example, a vibration feeder and a rotary seal valve, and discharges a desired amount of coke every unit time.
- the gas blowing part 2d is provided in the lower part in the cooling chamber 2, introduces a cooling gas into the cooling chamber 2, and blows it into the coke.
- the cooling gas is, for example, an inert gas mainly containing nitrogen gas.
- the sloping flue portion 2 c is provided on the outer periphery of the upper portion of the cooling chamber 2 and temporarily receives the cooling gas that has passed through the coke in the cooling chamber 2.
- the boiler 3 has a gas receiving part 3a, a gas delivery part 3b, and a vapor discharge part 3c.
- the boiler 3 receives gas from the gas receiving part 3a and sends it out from the gas sending part 3b, generates steam by sensible heat of the gas passing between the gas receiving part 3a and the gas sending part 3b, and the steam is It discharges from the discharge part 3c.
- a turbine generator 31 is connected to the steam discharge portion 3 c through a steam discharge pipe 30.
- the turbine generator 31 generates power using the steam discharged from the steam discharge unit 3c.
- the steam discharge pipe 30 is provided with a main steam flow meter 32.
- the main steam flow meter 32 detects the amount of steam passing through the steam discharge pipe 30 (steam generation amount).
- the pipe 4 connects the slowing flue part 2 c of the cooling chamber 2 and the gas receiving part 3 a of the boiler 3.
- the pipe 4 guides the gas in the sloping flue portion 2 c to the boiler 3. That is, the pipe 4 and the sloping flue part 2c cooperate with each other to constitute the first gas line L1.
- a primary dust catcher 40 and a pre-boiler gas thermometer 41 are provided in the vicinity of the gas receiving portion 3 a in order from the upstream.
- the primary dust catcher 40 is, for example, a cyclone and separates dust from gas passing through the pipe 4.
- the pre-boiler gas thermometer 41 detects the gas temperature in the pipe 4 as the pre-boiler gas temperature (the temperature of the gas immediately before flowing into the boiler 3).
- the pipe 5 connects the gas delivery part 3b of the boiler 3 and the gas blowing part 2d of the cooling chamber 2.
- the pipe 5 guides the gas that has passed through the boiler 3 to the cooling chamber 2 as a cooling gas. That is, the pipe 5 constitutes the second gas line L2.
- a blower 50 is provided in the middle of the pipe 5.
- the blower 50 pumps gas from the boiler 3 side to the cooling chamber 2 side.
- An economizer 51 is provided in the downstream portion 5 a located on the downstream side of the blower 50 in the pipe 5.
- the economizer 51 is a heat exchanger and preheats water by sensible heat of gas passing through the pipe 5.
- the water preheated by the economizer 51 is introduced into the boiler 3 as water for generating steam.
- a gas analyzer (CO concentration meter) 52 is connected to the downstream portion 5a.
- a connecting portion between the downstream portion 5 a and the gas analyzer 52 is located on the downstream side of the economizer 51.
- the gas analyzer 52 analyzes the component of the gas passing through the pipe 5.
- the part located in the upstream of the blower 50 among the piping 5 is comprised by the two upstream parts 5b and 5c mutually parallel.
- a secondary dust catcher 53, a circulation flow meter 54, and a circulation flow rate adjustment valve (circulation flow rate adjustment portion) 55 are provided in this order from the upstream side.
- the secondary dust catcher 53 is, for example, a cyclone, and separates dust from the gas passing through the upstream portions 5b and 5c.
- the circulation flow meter 54 detects the gas flow rate (circulation flow rate) in the upstream portions 5b and 5c.
- the circulation flow rate adjustment valve 55 adjusts the circulation flow rate.
- the upstream parts 5b and 5c are piped along the periphery of the secondary dust catcher 53, they are longer than the downstream part 5a. For this reason, it is easy to arrange the circulation flow meter 54 and the circulation flow rate adjustment valve 55 in the upstream portions 5b and 5c.
- the bypass pipe 6 connects the economizer 51 and the upstream portion of the pipe 4, and guides part of the gas from the blower 50 toward the cooling chamber 2 to the pipe 4 without passing through the cooling chamber 2. That is, the bypass pipe 6 constitutes a bypass line L3 that guides part of the gas passing through the second gas line L2 to the first gas line L1.
- the bypass pipe 6 is provided with a bypass flow rate adjustment valve 60 and a bypass flow meter 61 in order from the upstream side.
- the bypass flow rate adjustment valve (bypass flow rate adjustment unit) 60 adjusts the gas flow rate (bypass flow rate) in the bypass pipe 6.
- the bypass flow meter 61 detects a bypass flow rate.
- the gas diffusion pipe 7 is connected to the economizer 51 and guides a part of the gas from the blower 50 toward the cooling chamber 2 to the outside. That is, the gas diffusion pipe 7 constitutes a diffusion line L4 that guides a part of the gas passing through the second gas line L2 to the outside.
- the gas diffusion pipe 7 is provided with a diffusion flow rate control valve 70 and a diffusion flow meter 71 in order from the upstream side.
- a diffusion flow rate adjustment valve (a diffusion flow rate adjustment unit) 70 adjusts a gas flow rate (a diffusion flow rate) in the gas diffusion pipe 7.
- the diffusion flow meter 71 detects the diffusion flow rate.
- the auxiliary gas supply pipe 8 is connected to the slowing flue portion 2c, and introduces combustion auxiliary gas containing oxygen into the slowing flue portion 2c. That is, the auxiliary gas supply pipe 8 constitutes an auxiliary gas line L5 that guides the combustion auxiliary gas to the first gas line L1.
- the combustion auxiliary gas is, for example, air.
- the auxiliary gas supply pipe 8 is provided with a blower 80, an auxiliary gas flow meter 81, and an auxiliary gas flow rate adjustment valve 82 in order from the upstream side.
- the blower 80 pumps the combustion auxiliary gas to the slowing flue portion 2c side.
- the auxiliary gas flow meter 81 detects the gas flow rate (auxiliary gas flow rate) in the auxiliary gas supply pipe 8.
- the auxiliary gas flow rate adjustment valve 82 adjusts the auxiliary gas flow rate.
- the control unit 10 receives information from the coke discharge mechanism 20, the main steam flow meter 32, the pre-boiler gas thermometer 41, the gas analyzer 52, the circulation flow meter 54, the bypass flow meter 61, the diffusion flow meter 71, and the auxiliary gas flow meter 81. Is obtained, and the coke dry extinguishing method described later is executed by controlling the circulation flow rate control valve 55, the bypass flow rate control valve 60, the diffusion flow rate control valve 70, and the auxiliary gas flow rate control valve 82.
- a cooling gas passes through the pipes 4 and 5 and circulates between the cooling chamber 2 and the boiler 3.
- the red hot coke is cooled as the cooling gas passes.
- the coke after cooling is discharged from the coke discharging unit 2b by the coke discharging mechanism 20.
- steam is generated by the sensible heat of the gas that has passed through the red hot coke, and is discharged from the steam discharge section 3c.
- the turbine generator 31 is driven by the released steam to generate power. Thereby, the energy released from the red hot coke is recovered as electric power.
- the gas cooled with the generation of steam is blown again into the cooling chamber 2 as a cooling gas. In this way, the red hot coke is continuously cooled and the heat energy is recovered. The recovery of thermal energy contributes to CO2 reduction.
- the coke dry fire extinguishing method executed by the control unit 10 will be described in detail.
- the control unit 10 performs control for automatically adjusting these parameters.
- the control unit 10 acquires the circulation flow rate from the two circulation flow meters 54 provided in the upstream portions 5b and 5c, acquires the bypass flow rate from the bypass flow meter 61, and obtains the diffusion flow rate from the diffusion flow meter 71. Acquire the coke discharge amount from the coke discharge mechanism 20. Then, the bypass flow rate and the diffused flow rate are subtracted from the circulating flow rate to calculate the chamber inlet flow rate, and the circulating flow rate control valve 55 or the diffused flow rate control valve 70 is adjusted so that the ratio of the coke discharge amount and the chamber inlet flow rate approaches the target ratio. To control. That is, the control unit 10 constitutes an inlet flow rate control unit.
- the ratio of the chamber inlet flow rate to the coke discharge amount becomes lower than the target ratio, at least increasing the opening degree of the circulation flow rate adjusting valve 55 and reducing the opening degree of the diffusion flow rate adjusting valve 70. Do one. As the ratio of the chamber inlet flow rate to the coke discharge amount becomes higher than the target ratio, at least one of reducing the opening degree of the circulation flow rate adjusting valve 55 and increasing the opening degree of the diffusion flow rate adjusting valve 70 is performed. Do.
- the target ratio is appropriately set according to the temperature of the red hot coke, the target exhaust coke temperature, and the like.
- the amount of cooling gas is automatically adjusted according to the increase or decrease of the coke to be cooled, so the discharge coke temperature is automatically adjusted. That is, since at least one of the parameters is automatically adjusted, the burden on the operator can be reduced. Furthermore, compared with performing manual adjustment, stabilization of the discharged coke temperature is also expected. By stabilizing the discharged coke temperature, it is possible to improve the service life of a device that discharges and conveys coke after cooling, such as the coke discharging mechanism 20. For example, burnout or deterioration of the conveyor belt for discharging coke can be prevented.
- the chamber inlet flow rate In order to control the chamber inlet flow rate, it is necessary to detect the chamber inlet flow rate, but in the vicinity of the inlet of the cooling chamber 2, a branch portion of the pipe 5, the bypass pipe 6 and the gas diffusion pipe 7, a gas analyzer 52, the economizer 51 and the like are concentrated, so that the straight pipe length necessary for installing the flow meter cannot be secured, and the installation of the flow meter is difficult.
- the chamber inlet flow rate is calculated by subtracting the bypass flow rate and the diffusion flow rate from the circulation flow rate. This also contributes to the realization of automatic adjustment of the discharged coke temperature.
- control unit 10 controls the bypass flow rate control valve 60 or the auxiliary gas flow rate control valve 82 so that the pre-boiler gas temperature approaches the target temperature. That is, the control unit 10 also constitutes a gas temperature control unit. With reference to FIG. 2, the control procedure of the control part 10 as a gas temperature control part is demonstrated.
- A0 is an initial value of the auxiliary gas flow rate target value.
- B0 is an initial value of the bypass flow rate target value.
- Vg is a correction value of the auxiliary gas flow rate.
- Vb is a correction value of the bypass flow rate.
- the control unit 10 as a gas temperature control unit acquires the steam generation amount from the main steam flow meter 32, acquires the auxiliary gas flow rate from the auxiliary gas flow meter 81, and acquires the CO concentration from the gas analyzer 52. Based on the steam generation amount, the pre-boiler gas temperature, and the CO concentration, correction values Vg and Vb of the auxiliary gas flow rate and the bypass flow rate are calculated. Specifically, first, it is confirmed whether or not the steam generation amount is equal to or less than the target amount (S01). The target amount is appropriately set according to the specifications of the turbine generator 31 and the like. If the steam generation amount is equal to or less than the target amount, it is next checked whether the gas temperature before the boiler is lower than the target temperature (S02).
- the target temperature is appropriately set from the viewpoint of boiler equipment protection and the like. If the pre-boiler gas temperature is lower than the target temperature, it is next checked whether the CO concentration is lower than the target concentration (S03). The target concentration is appropriately set from the viewpoint of optimization of combustion assistance. If the CO concentration is less than the target concentration, the correction value Vg is set to 0, and the correction value Vb is set to -B4 (S04). B4 is, for example, 15 to 20% of the initial value B0.
- the correction value Vg is set to + A6 and the correction value Vb is set to -B2 (S07).
- A6 is 3 to 4% of the initial value A0, for example, and is larger than A7.
- B2 is 5 to 10% of the initial value B0, for example, and is smaller than B3.
- pre-boiler gas temperature is equal to or higher than the target temperature
- A5 is, for example, a value of 2 to 3% with respect to the initial value A0.
- the correction value Vg is set to + A4, and the correction value Vb is set to 0 (S13).
- A4 is, for example, a value of 2 to 3% with respect to the initial value A0.
- the correction value Vg is set to 0 and the correction value Vb is set to + B1 (S18).
- B1 is, for example, 15 to 20% of the initial value B0.
- the correction value Vg is set to -A1 (S19).
- A1 is, for example, 3 to 4% of the initial value A0.
- the control unit 10 adds the correction value Vg to the initial value A0 and calculates the target value of the auxiliary gas flow rate.
- the correction value Vb is added to the initial value B0 to calculate the target value of the bypass flow rate (S20).
- the auxiliary gas flow rate adjustment valve 82 and the bypass flow rate adjustment valve 60 are controlled so that the auxiliary gas flow rate and the bypass flow rate approach the target values (S21). That is, the opening degree of the auxiliary gas flow rate adjusting valve 82 is increased as the auxiliary gas flow rate becomes smaller than the target value, and the opening degree of the bypass flow rate adjusting valve 60 is changed as the bypass flow rate becomes smaller than the target value.
- the opening degree of the auxiliary gas flow rate adjustment valve 82 is reduced, and as the bypass flow rate becomes larger than the target value, the opening degree of the bypass flow rate adjustment valve 60 becomes smaller.
- the control unit 10 as the gas temperature control unit repeats the above procedure.
- the repetition cycle is, for example, 60 seconds.
- the gas temperature before the boiler is lowered.
- the gas temperature before the boiler rises. For this reason, when the gas temperature before the boiler is lower than the target temperature, the gas temperature before the boiler can be increased by performing at least one of the reduction of the bypass flow rate and the increase of the auxiliary gas flow rate.
- the pre-boiler gas temperature is higher than the target temperature, the pre-boiler gas temperature can be lowered by performing at least one of increasing the bypass flow rate and decreasing the auxiliary gas flow rate. Therefore, the gas temperature before the boiler is automatically adjusted so as to approach the target temperature.
- the chamber inlet flow rate is automatically adjusted by the control as the inlet flow rate control unit, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed. That is, since the chamber inlet flow rate and the pre-boiler gas temperature, which are at least two of the above parameters, are automatically adjusted, the burden on the operator can be further reduced. Furthermore, compared with performing manual adjustment, stabilization of the gas temperature before the boiler is also expected. By stabilizing the gas temperature before the boiler, the life of the boiler can be improved. For example, breakage or deterioration of the boiler tube can be prevented.
- the auxiliary gas flow rate is increased and the bypass flow rate is increased. Since the auxiliary gas flow rate is increased as the CO concentration increases, the CO concentration is reduced. Since the bypass flow rate is increased with the increase of the auxiliary gas flow rate, the influence of the increase of the auxiliary gas flow rate on the pre-boiler gas temperature is negated. Thereby, the adjustment of the gas temperature before the boiler is continued without being affected by the adjustment of the CO concentration. Further, since the chamber inlet flow rate is automatically adjusted by the control as the inlet flow rate control unit, fluctuations in the chamber inlet flow rate due to fluctuations in the bypass flow rate are suppressed.
- the chamber inlet flow rate, the pre-boiler gas temperature, and the CO concentration which are at least three of the above parameters, are automatically adjusted, the burden on the operator can be further reduced. Furthermore, stabilization of the CO concentration that is unburned is also expected. By stabilizing the CO concentration, it is possible to recover sensible heat more efficiently.
- the auxiliary gas flow rate control unit is controlled so as to reduce the gas flow rate of the auxiliary gas line, and the process waits for the steam generation amount to become smaller than the target amount. (S19).
- the steam generation amount is further adjusted. That is, since at least four of the above parameters are automatically adjusted, the burden on the operator can be further reduced.
- the process waits for the steam generation amount to become smaller than the target amount. Therefore, the steam generation amount is adjusted in preference to the adjustment of the pre-boiler gas temperature. For this reason, damage to turbine generator 31 etc. driven with steam can be prevented more reliably.
- the auxiliary gas flow rate is reduced, heat generation in the front stage of the boiler 3 is reliably suppressed, and the amount of steam generated can be quickly reduced.
- the burden on the operator can be reduced.
- the present inventors estimated the burden on the operator in the coke dry fire extinguishing apparatus 1 depending on whether or not the above-described control by the control unit 10 is performed.
- the coke discharge temperature is 180 ° C. or less
- the pre-boiler gas temperature is 850 to 970 ° C.
- the CO concentration is 1 to 3%, when the above control is not performed, It is expected to require monitoring and manual adjustment by two operators.
- first control only control for adjusting the circulation flow rate or the discharge flow rate so that the ratio between the coke discharge amount and the chamber inlet flow rate approaches the target ratio is executed.
- first control for adjusting the circulation flow rate or the discharge flow rate so that the ratio between the coke discharge amount and the chamber inlet flow rate approaches the target ratio.
- Monitoring and manual control are performed by increasing the gas flow rate of the auxiliary gas line and increasing the gas flow rate of the bypass line (hereinafter referred to as “third control”) together with the first control as the CO concentration increases. It is expected that the time required for adjustment can be further reduced by about 10%.
- the control hereinafter referred to as “fourth control”
- the first is referred to as the first. It is expected that the time required for monitoring and manual adjustment can be further reduced by about 10% when executed together with the control.
- control unit 10 does not necessarily need to automatically adjust all of the exhaust coke temperature, the pre-boiler gas temperature, the steam generation amount, and the CO concentration.
- the control unit 10 does not necessarily need to automatically adjust all of the exhaust coke temperature, the pre-boiler gas temperature, the steam generation amount, and the CO concentration.
- the exhaust coke temperature may be automatically adjusted, and adjustment of the pre-boiler gas temperature, steam generation amount, and CO concentration may be left to manual operation.
- the present invention can be used for a coke dry fire extinguishing apparatus.
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Abstract
Description
Claims (10)
- 赤熱コークスを受け入れ、冷却用のガスにより冷却して排出するためのクーリングチャンバと、
前記赤熱コークスが発生する熱からエネルギーを回収するためのボイラと、
前記クーリングチャンバ内のコークスを通過した前記冷却用のガスを前記ボイラに導く第1のガスラインと、
前記ボイラを通過した前記冷却用のガスを前記クーリングチャンバに導く第2のガスラインと、
前記第2のガスラインを通る前記冷却用のガスの一部を、前記クーリングチャンバに通さず前記第1のガスラインに導くバイパスラインと、
前記第2のガスラインを通る前記冷却用のガスの一部を外部に導く放散ラインと、
前記バイパスライン及び前記放散ラインの上流側における前記第2のガスラインのガス流量を検出する循環流量計及び当該ガス流量を調節する循環流量調節部と、
前記バイパスラインのガス流量を検出するバイパス流量計及び当該ガス流量を調節するバイパス流量調節部と、
前記放散ラインのガス流量を検出する放散流量計及び当該ガス流量を調節する放散流量調節部と、
前記循環流量計により検出された流量から、前記バイパス流量計及び前記放散流量計により検出された流量を減算してチャンバ入口流量を算出し、前記クーリングチャンバからの前記コークスの排出量と前記チャンバ入口流量との比率が目標比率に近付くように、前記循環流量調節部又は前記放散流量調節部を制御する入口流量制御部と、を備えるコークス乾式消火装置。 - 酸素を含有した燃焼補助ガスを前記第1のガスラインに導く補助ガスラインと、
前記補助ガスラインのガス流量を調節する補助ガス流量調節部と、
前記第1のガスラインのガス温度をボイラ前ガス温度として検出するボイラ前ガス温度計と、
前記ボイラ前ガス温度が目標温度に近付くように、前記バイパス流量調節部又は前記補助ガス流量調節部を制御するガス温度制御部と、を更に備える請求項1記載のコークス乾式消火装置。 - 前記ガス温度制御部は、
前記ボイラ前ガス温度が前記目標温度より高い場合には、前記バイパス流量調節部の制御による前記バイパスラインのガス流量の増量及び前記補助ガス流量調節部の制御による前記補助ガスラインのガス流量の減量の少なくとも一方を行い、
前記ボイラ前ガス温度が前記目標温度より低い場合には、前記バイパス流量調節部の制御による前記バイパスラインのガス流量の減量及び前記補助ガス流量調節部の制御による前記補助ガスラインのガス流量の増量の少なくとも一方を行う、請求項2記載のコークス乾式消火装置。 - 前記冷却用のガスのCO濃度を検出するCO濃度計を更に備え、
前記ガス温度制御部は、前記CO濃度が高くなるのに応じて前記補助ガスラインのガス流量を増やすと共に前記バイパスラインのガス流量を増やすように、前記バイパス流量調節部及び前記補助ガス流量調節部を制御する、請求項2又は3記載のコークス乾式消火装置。 - 前記ボイラからの蒸気発生量を検出する蒸気流量計を更に備え、
前記ガス温度制御部は、前記蒸気発生量が目標量よりも大きい場合には、前記補助ガスラインのガス流量を減らすように補助ガス流量調節部を制御しながら、前記蒸気発生量が前記目標量よりも小さくなるのを待機する、請求項2~4のいずれか一項記載のコークス乾式消火装置。 - 赤熱コークスを受け入れ、冷却用のガスにより冷却して排出するためのクーリングチャンバと、
前記赤熱コークスが発生する熱からエネルギーを回収するためのボイラと、
前記クーリングチャンバ内のコークスを通過した前記冷却用のガスを前記ボイラに導く第1のガスラインと、
前記ボイラを通過した前記冷却用のガスを前記クーリングチャンバに導く第2のガスラインと、
前記第2のガスラインを通る前記冷却用のガスの一部を、前記クーリングチャンバに通さず前記第1のガスラインに導くバイパスラインと、
前記第2のガスラインを通る前記冷却用のガスの一部を外部に導く放散ラインと、を備える装置の制御部により実行されるコークス乾式消火方法であって、
前記バイパスライン及び前記放散ラインの上流側における前記第2のガスラインのガス流量を循環流量として取得し、
前記バイパスラインのガス流量をバイパス流量として取得し、
前記放散ラインのガス流量を放散流量として取得し、
前記循環流量から前記バイパス流量及び前記放散流量を減算してチャンバ入口流量を算出し、前記クーリングチャンバからの前記コークスの排出量と前記チャンバ入口流量との比率が目標比率に近付くように、前記循環流量又は前記放散流量を調節する、コークス乾式消火方法。 - 前記第1のガスラインのガス温度をボイラ前ガス温度として更に取得し、
酸素を含有した燃焼補助ガスを前記第1のガスラインに導く補助ガスラインを更に用い、
前記ボイラ前ガス温度が目標温度に近付くように、前記バイパスライン及び前記補助ガスラインのガス流量を更に調節する、請求項6記載のコークス乾式消火方法。 - 前記ボイラ前ガス温度が前記目標温度より高い場合には、前記バイパスラインのガス流量の増量及び前記補助ガスラインのガス流量の減量の少なくとも一方を行い、
前記ボイラ前ガス温度が前記目標温度より低い場合には、前記バイパスラインのガス流量の減量及び前記補助ガスラインのガス流量の増量の少なくとも一方を行う、請求項7記載のコークス乾式消火方法。 - 前記冷却用のガスのCO濃度を更に取得し、
前記CO濃度が高くなるのに応じて前記補助ガスラインのガス流量を増やすと共に前記バイパスラインのガス流量を増やす、請求項7又は8記載のコークス乾式消火方法。 - 前記ボイラからの蒸気発生量を更に取得し、
前記蒸気発生量が目標量よりも大きい場合には、前記補助ガスラインのガス流量を減らして前記蒸気発生量が前記目標量よりも小さくなるのを待機し、
前記蒸気発生量が前記目標量よりも小さくなった後に、前記バイパスライン及び前記補助ガスラインのガス流量を調節して、前記ボイラ前ガス温度を前記目標温度に近付ける、請求項7~9のいずれか一項記載のコークス乾式消火方法。
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RU2016107218A RU2659974C2 (ru) | 2013-08-01 | 2014-07-31 | Установка для сухого тушения кокса и способ сухого тушения кокса |
CN201480043189.0A CN105452420B (zh) | 2013-08-01 | 2014-07-31 | 干熄焦装置和干熄焦方法 |
UAA201602014A UA118969C2 (uk) | 2013-08-01 | 2014-07-31 | Установка для сухого гасіння коксу та спосіб сухого гасіння коксу |
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