WO2011072222A2 - Système et procédé d'injection d'un composé dans un four à usage général - Google Patents

Système et procédé d'injection d'un composé dans un four à usage général Download PDF

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Publication number
WO2011072222A2
WO2011072222A2 PCT/US2010/059886 US2010059886W WO2011072222A2 WO 2011072222 A2 WO2011072222 A2 WO 2011072222A2 US 2010059886 W US2010059886 W US 2010059886W WO 2011072222 A2 WO2011072222 A2 WO 2011072222A2
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WO
WIPO (PCT)
Prior art keywords
nozzle
compound
fluid
valve
sootblower
Prior art date
Application number
PCT/US2010/059886
Other languages
English (en)
Other versions
WO2011072222A3 (fr
Inventor
Christopher L. Abeyta
Original Assignee
Power & Control Solutions, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Power & Control Solutions, Inc. filed Critical Power & Control Solutions, Inc.
Publication of WO2011072222A2 publication Critical patent/WO2011072222A2/fr
Publication of WO2011072222A3 publication Critical patent/WO2011072222A3/fr
Priority to US13/492,479 priority Critical patent/US9303870B2/en
Priority to US14/562,276 priority patent/US20150086930A1/en
Priority to US14/563,648 priority patent/US20150090165A1/en
Priority to US15/089,204 priority patent/US20160290638A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F22B37/545—Valves specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/16—Rotary appliances using jets of fluid for removing debris
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the subject of this disclosure may relate generally to systems, devices, and methods for facilitating the injection of various compounds into a utility furnace.
  • Utility furnaces are used in various industries for a variety of different purposes. Common issues associated between these various industries include the handling of the by products created by the combusted fuel. These byproducts can decrease the utility furnace efficiency and pose other pollution problems.
  • the pulverized coal used in various types of boilers, burns in a combustion chamber.
  • the hot gaseous combustion products then follow various paths, giving up their heat to steam, water and combustion air before exhausting through a stack.
  • the boiler is constructed mainly of interconnected elements such as cylinders such as the super heater tubes, water walls, various larger diameter headers, and large drums. Water and steam circulate in these elements, often by natural convection, the steam finally collecting in the upper drum, where it is drawn off for use. Water/steam tubes typically almost completely cover the walls of the passage so that they efficiently transfer heat to the water/steam. As the coal is burned, ash and/or other products of combustion build-up on the tubes.
  • Soot- blowers are mechanical devices used for on-line cleaning of ash and slag deposits on a periodic basis. They direct a pressurized fluid through nozzles into the soot or ash accumulated on the heat transfer surface of boilers to remove the deposits and maintain the heat transfer efficiency.
  • the soot and dust generated in combustion get deposited on outer tube surfaces. This adds to the fuel requirements to maintain utility furnace temperatures. Running with added fuel in turn increases deposition of byproducts of fuel burning and also increases the chances of the tubes failure by overheating. This eventually results in shutting down of the furnace for repairs. All this can be avoided by soot blowing. Regular soot blowing saves fuel and boiler downtime.
  • sootblowers include but not limited to wall sootblower, long retractable sootblower, rotating element sootblower, helical sootblower, and Rake-type blower.
  • pressured fluid typically air, saturated steam or super heated steam
  • Sootblowers are less effective at removing the slag.
  • an apparatus comprises a nozzle configured to receive a compound, wherein the nozzle is further configured to mix the compound with a fluid.
  • a system comprises a fluid supply configured to deliver a fluid; a valve connected to the fluid supply wherein the valve is operable to control the fluid from the fluid supply; a feed tube configured to connect to the valve and transport the fluid; a delivery device configured to connect to the feed tube and configured to eject the fluid into a utility furnace; a solid agent capable of improving the efficiency of the utility furnace; a hopper configured to hold a quantity of the solid agent; an auger connected to the hopper and operable to transfer solid agent from the hopper; and a nozzle operable to receive the solid agent from the auger and combine the solid agent with the fluid supply wherein, the nozzle is configured to be removably connected to the valve.
  • a method comprises attaching a nozzle inline with a fluid supply; delivering a solid agent to the nozzle mixing the solid agent with the fluid supply forming a mixture; delivering the mixture to a utility furnace through a manufactured sootblower; covering areas of the furnace accessible by sootblowers; and impregnating the compound to affected slagging areas regardless of changing flue gas flow dynamics.
  • Figure 1 is an exemplary utility furnace depicting sootblower locations
  • Figure 2 is a cross section of an exemplary embodiment of a nozzle used to mix various compounds and pressurized fluid
  • Figure 3 is cross section of an exemplary embodiment of an apparatus for mixing a compound with a pressurized fluid
  • Figure 4 is an exemplary embodiment of a flow process of the system
  • Figure 5 is an exemplary embodiment of a system as part of a wall mounted sootblower
  • Figure 6 is an exemplary embodiment of a system as part of a retractable sootblower
  • Figure 7 is an exemplary embodiment of distribution of a compound from a retractable sootblower
  • Figure 8 is an exemplary embodiment of a compound from a wall mounted sootblower.
  • Figure 9 is an exemplary embodiment of a method of the present invention. Detailed Description
  • systems, devices, and methods are provided, for among other things, facilitating the injection of various compounds into a utility furnace.
  • the following descriptions are not intended as a limitation on the use or applicability of the invention, but instead, are provided merely to enable a full and complete description of exemplary embodiments.
  • nozzle 200 may have a first side 204, an inlet side to the fluid, and a second side 202, an exit side to the fluid. 200 may be variously sized to accommodate the equipment that it mates to. In one exemplary embodiment nozzle 200 may be approximately 1-3 inches in diameter at the outlet to accommodate common feed tube sizes used with utility furnaces. However, nozzle 200 can be sized to fit various components. In accordance with one embodiment, nozzle 200 may have a varying cross-section between the first side and the second side. In various embodiments, the varying cross-section of the nozzle may comprise a long radius 212.
  • the long radius may have its largest opening in the nozzle on first side 204 and the smallest diameter cross-section on second side 202.
  • nozzle 200 comprises a varying the cross section that causes a high pressure on first side 204 relative to a low pressure on the second side 202.
  • the nozzle may also have a compound entrance 208.
  • the compound may be brought into nozzle 200 via compound entrance 208.
  • Nozzle 200 may also have a compound exit 206 (also referred to herein as chemical injection port).
  • the compound exits nozzle 200 via compound exit 206.
  • nozzle 200 may be configured for the mixing a compound with a pressurized fluid stream.
  • the nozzle may further comprise a valve 210.
  • valve 210 may be a ball valve.
  • valve 210 may be a gate valve.
  • Valve 210 may control the flow of the compound.
  • the flow of the incoming compound may be stopped and started by opening and closing valve 210.
  • the valve may prevent the compound from flowing away from nozzle 200 and only allow the compound to flow into nozzle 200.
  • an apparatus for mixing a compound with a pressurized fluid stream comprises a nozzle, a valve, and a feed tube.
  • nozzle 300 may be positioned between valve 306 and feed tube 304.
  • the pressurized fluid can pass through nozzle 300 coming from valve 306 and flowing into feed tube 304.
  • nozzle 300 may be configured to receive the compound at entrance 308 and mix the compound with the pressurized fluid stream.
  • nozzle 300 may include features which allow for the connection of nozzle 300 to valve 306 or to feed tube 304. Such features might include any of a variety of fasteners known in the industry e.g. bolts, weld, pressure fittings, bracketed flanges, etc.
  • nozzle 300 may be an integral or integrated part of valve 306 or feed tube 304.
  • nozzle 300 and feed tube 304 may be manufactured as one piece.
  • valve 306 and nozzle 300 maybe manufactured as one piece.
  • all three elements may be manufactured as one piece.
  • valve 306 is a poppet valve.
  • valve 306 is any of a variety of valves include but not limited too diaphragm valves, pressure regulator valves, check valves, etc.
  • valve 306 can be any of a variety of valves used in the art whereby the valve controls the flow of fluid.
  • valve 306 may be configured to adjust the pressure of the fluid passing through.
  • the apparatus may further comprise feed tube 304.
  • feed tube 304 may be configured to attach directly to either valve 306 or nozzle 300.
  • feed tube 304 may be configured to be detached from valve 306 and attached to nozzle 300 inserted between feed tube 304 and valve 306. In this manner, an existing device may be retrofitted to include the nozzle 300.
  • the feed tube may also be integrated with nozzle 300 and/or valve 306.
  • feed tube 304 maybe configured to withstand the pressure and corrosion caused by any material flowing through it.
  • fluid may flow through the feed tube at 300 SCFM to 1000 SCFM. However, depending on the application smaller or larger rates may be used.
  • the feed tube may be comprised of hardened steel that is capable of withstanding the mixture of the high pressure fluid and also the compound introduced at nozzle 300. Further, other various materials may be used depending on the intended use of the system. In some instances the feed tube may be a component already installed in a facility incorporating the apparatus.
  • the compound introduced at nozzle 300 may be any of a variety of solids, liquids, or gases that may beneficially be injected into a utility furnace.
  • the compounds should be configured such that they are capable of being transported in line through a pressure system. In various examples the compound may be caused to move through the system via a positive pressure or a negative pressure.
  • a compound in solid form may be sufficiently granular that it can pass through various types of tubing.
  • the compound may be a solid agent or a dry compound, being a substantially dry, granular solid having insignificant levels of humidity or liquid.
  • the compound is delivered as a slurry, liquid, or gas.
  • delivering the compound as a slurry, liquid, or gas may be beneficial where pumping is incorporated. This may be especially true where there are high pressures to overcome at the nozzle.
  • delivering the compound as a solid may be beneficial when the compound is delivered by transport air created by a vacuum.
  • compounds used in the system may include, but are not limited to, magnesium hydroxide, potassium hydroxide, sodium hydroxide, aluminum hydroxide, magnesium, kaolin, mullite, trona, and/or dry urea- based solids. Any such compound that may be desirable for a variety of chemically reactive, cleaning, processing or other beneficial purposes inside of a utility furnace may also be incorporated.
  • the fluid comprises pressurized air.
  • the fluid might comprise steam.
  • the fluid may comprise any compressed or pressurized fluid capable of being projected through the system.
  • the apparatus for mixing a compound with a pressurized fluid stream may be used or adapted to a utility furnace.
  • the apparatus may also be incorporated into a larger system wherein the system comprises compound feed mechanism 400 which comprises solid agent 402, compound storage 404, and nozzle 406, coupled inline with fluid delivery system 420 which comprises fluid supply 422, valve 424, feed tube 426 and delivery mechanism 428 either removable or permanently coupled to utility furnace 430.
  • the fluid may comprise any of a steam, air or other compressed gasses or fluids typically released in a utility furnace.
  • the fluid supply may be an air compressor, steam recirculation system, pump, pressure vessel etc.
  • the fluid supply may be any commercially available mechanism capable of creating, maintaining, or adjusting these pressures as contemplated herein.
  • the fluid supply may be positioned and/or coupled to valve 424 directly or by means of other connections and/or devices.
  • the delivery mechanism may be lance 618 and/or injection nozzle 620.
  • the delivery mechanism comprises the injection nozzle associated with a wall blower.
  • the delivery mechanism may be any permanent or temporary fixture on the utility furnace.
  • a delivery mechanism is any component capable of delivering the pressurized fluid and/or mixture compound into a utility furnace.
  • lance 618 may be capable of being inserted partially or fully into a utility furnace.
  • the lance tube is what is carried and rotated into the furnace by a gearbox/motor attached to the sootblower.
  • the lance tube may surround the stationary feed tube and is sealed by a gland.
  • injection nozzle 620 is configured to deliver the fluid supply and/or the fluid supply compound mixture to specific locations inside the utility furnace, such as to a wall as depicted in Fig. 8 or out into an open chamber as depicted in Fig. 7.
  • the compound can be delivered to the exhaust gas, exhaust chamber, combustion chamber, water walls, pipes, superheat tubes, the back pass, or any other element in a utility furnace or its exhaust gas stream.
  • a compound storage 514 may comprise a hopper with an auger feeder connected either directly or indirectly to nozzle 502.
  • the compound is stored in a nonpressurized hopper.
  • the compound storage 514 may comprise a storage container and pressure mechanism.
  • the compound may be stored and delivered by the pressure mechanism which may include pressurized vessels, gravity feed, pumps (including any of a variety of direct lift, displacement, velocity, buoyancy, and/or gravity pumps), conveyors or any commonly known apparatus capable of delivering the compound to the inlet of the nozzle.
  • the pressure mechanism may include pressurized vessels, gravity feed, pumps (including any of a variety of direct lift, displacement, velocity, buoyancy, and/or gravity pumps), conveyors or any commonly known apparatus capable of delivering the compound to the inlet of the nozzle.
  • a vacuum may be present on the second side of nozzle 200 which may create a force which may draw sufficient amounts of compound into the fluid stream to be delivered with the system.
  • nozzle 200 may cause 60 inches of vacuum (i.e. a drop in pressure expressed in inches of water).
  • the vacuum can be greater or less than 60 inches of water depending on the application. For example, there can be no vacuum at nozzle 200 but instead nozzle 200 may create a zone of static or low pressure compared to the fluids in the sootblower.
  • Variations on the profile of the nozzle can be optimized to produce a sufficient vacuum and/or a maximum pressure drop.
  • the compound may be pressurized by a pump or the like and introduced into the fluid stream under pressure. Such pressurization can occur in any way typical of the art including, but not limited to the forces created by the devices discussed above.
  • fluid delivery mechanism 420 as discussed above can be incorporated to deliver at least a pressurized fluid flow into utility furnace 430.
  • the utility furnace is a coal fired induction draft power plant furnace.
  • a utility furnace may be any of a commercially available or custom furnaces including but not limited to boilers, HVAC, cokers, pulp and paper furnaces, etc.
  • the furnace may be any of a variety of boilers fired by a variety of fossil fuels including, but not limited to, coal, petroleum, natural gas, etc.
  • a utility furnace might include any of a variety of boilers fired by alternative fuels, such as, for example, bio fuels or a combination of bio fuels and fossil fuels.
  • utility furnaces might incorporate or include furnaces used in a variety of industries including metal refineries, (e.g. cokers), pulp and paper, energy production, waste disposal, heating, etc.
  • soot blowers can be located in numerous locations around a furnace. Variations in numbers and locations depend on the size and type of furnaces. Each location may be specifically targeted to allow access to particular elements or locations inside of the furnace. In an exemplary embodiment, these strategically located sootblowers can be used to deliver compound into the furnace. For example, wall mounted soot blowers may be located in the primary combustion area of the furnace. Also, retractable long lance type sootblowers may be located in the superheater or back pass portions of the furnace. In accordance with various other exemplary embodiments, a utility furnace may have various types of sootblowers located near superheaters, reheaters, convection section of horizontal tubes, the economizer and/or air preheaters.
  • a coal fired furnace system may comprise wall mounted soot blowers 516.
  • Wall mounted soot blower 516 may, for example be a Diamond Power Model IR-3Z sootblower or a Clyde Bergemann Model RW5E.
  • wall mounted soot blower 516 may comprise any device configured to deliver fluid to the interior walls of a utility furnace.
  • wall mounted soot blower 516 may comprise feed tube 504 and valve 506.
  • nozzle 502 is inserted between feed tube 504 and valve 506.
  • nozzle 502 may be retrofitted into wall mounted soot blower 516.
  • wall mounted soot blower 516 may be originally constructed with nozzle 502 between feed tube 504 and valve 506.
  • nozzle 502 may be a component of a compound feed mechanism 400 which comprises valve 508, feed line 510, transport air valve 512 and compound storage 514.
  • Valve 508 may be coupled to feed line 510.
  • Feed line 510 may be coupled to transport air valve 512.
  • Transport air valve 512 may be coupled to compound storage 514.
  • nozzle 502 may receive the compound from compound storage 514 and mix the compound with fluid flowing through wall mounted sootblower 516.
  • Wall mounted sootblower 516 may carry the compound to any of a variety of utility furnaces.
  • Wall mounted sootblower 516 may also deliver the compound to wall 530 or any targeted area of the furnace reachable by wall mounted sootblower 516.
  • transport air valve 512 may also include components capable of attaching pressurized air to feed line 510.
  • transport air valve 512 may also include a flow regulator, an air pressure regulator, and/or a filter. These components may enable transport air valve 512 to function as an air pressure source so that it is possible to add additional transport air to move larger heavier quantities of the compound.
  • retractable sootblower 616 may comprise feed tube 604 and valve 606.
  • nozzle 602 is inserted between feed tube 604 and valve 606.
  • nozzle 602 may be retrofitted into retractable sootblower 616.
  • retractable sootblower 616 may be originally constructed with nozzle 602 between feed tube 604 and valve 606.
  • nozzle 602 may be a component of a compound feed mechanism 400 which comprises valve 608, feed line 610, transport air valve 612 and compound storage 614.
  • Valve 608 may be coupled to feed line 610.
  • Feed line 610 may be coupled to transport air valve 612.
  • Transport air valve 612 may be coupled to compound storage 614.
  • nozzle 602 may receive the compound from compound storage 614 and mix the compound with fluid flowing through retractable sootblower 616.
  • the sootblower may be a Long Retract Diamond Power Model ⁇ -525 or a Long Retract Clyde Bergemann Model US.
  • Sootblower 616 may comprise any device configured to deliver fluid into the interior of any of a variety of utility furnaces. Specifically, lance 618 and injection nozzle 620 may extend into the interior of a utility furnace. Retractable sootblower 616 may then deliver the compound to, for example, the wall, superheat pipes, or any targeted area of the furnace reachable by retractable sootblower 616.
  • the nozzle can be placed in line with any commercially available or custom built soot blower including but not limited to a wall sootblower, long retractable sootblower, rotating element sootblower, helical sootblower, and rake-type blower.
  • the nozzle may be included as a constituent piece of the valve, the feed tube, or a combination of either.
  • the sootblowers may be installed on a furnace before adding the nozzle and compound feed. Alternatively a sootblower can be installed on a furnace after it has been retrofitted with a nozzle.
  • an apparatus mixes a compound with a pressurized fluid to be delivered into a utility furnace.
  • the mixture of the compound and the pressurized fluid may occur inside the body of the nozzle or may occur as the nozzle delivers the compound and pressurized fluid to the feed tube.
  • the nozzle functions to mix the compound with the pressurized fluid stream.
  • This mixture of pressurized fluid and compound is then delivered into a furnace, either by means of a custom apparatus or commercial apparatus. Any apparatus that functionally delivers the fluid compound mixture to the furnace is contemplated herein.
  • a first pressure may be the pressure at the poppet valve. This pressure is what is being put through the sootblower in the absence of the present invention. This pressure may also vary greatly due to a number of factors such as plant system pressure, poppet valve setting, and/or sootblower type.
  • a second pressure may be the pressure at the chemical injection port. The second pressure is a function of the pressure drop across the nozzle.
  • a third pressure discussed may be the pressure required to push the compound into the fluid stream running through the sootblower. The third pressure may be formed on or behind the compound in order to deliver it to the sootblower. The third pressure may be created by a pump.
  • the pressure of the fluid at the poppet valve in a utility furnace may be maximized in an attempt to deal with extreme slagging.
  • the fluid pressures at the poppet valves may be operated at higher pressures than the utility furnace manufacture recommended pressure settings.
  • High poppet valve pressures may translate into high chemical injection port pressures.
  • a pump may be used to increase the compound pressure in order to overcome the pressure at the chemical injection port.
  • the compound may be introduced as a wet slurry in order to ease introduction into the pressurized stream.
  • lower fluid pressures at the poppet valve correspond to lower fluid pressures at the chemical injection port.
  • lower pressures from the pump may be used in order to overcome the pressure at the chemical injection port.
  • the compound may be introduced as a wet slurry in order to ease introduction into the pressurized stream.
  • the still lower pressures at the poppet valve illustrate the vacuum that may be created at the nozzle allowing substantially easier introduction of the compound into the furnace regardless whether it is slurried or in dry form.
  • MgH0 2 is the compound.
  • MgH0 2 may be delivered by sootblowers to slag coated steam/water pipes to aid in the removal of slag.
  • the MgH0 2 is suited specifically to breaking up a variety of slag accumulations caused by coal based fuels burned inside of the utility furnace.
  • magnesium is added into a utility furnace to aid in the encapsulation of harmful by products.
  • magnesium, kaolin, mullite, and/or other beneficial agents or combinations of these agents can be introduced into the utility furnace. These agents can be introduced into the utility furnace, superheats, back pass, preheats, exhaust stream, or other location to aid in the encapsulation of S0 2 .
  • multiple compounds can be injected into the sootblowers to deal with inclement conditions such as low temperature. Dry has it's advantages in extreme cold temperatures in the sootblower in the furnace, dry injection is a good option for injecting in the ducts and the discharge of the air-preheaters.
  • poly-ethylene glycol (PEG) mixed with other chemicals discussed above, for example, MgH0 2 may be a good combination as a alternative to dry injection in extreme low temperature conditions.
  • the PEG can be effectively mixed with the compound at 55-60% solids by weight.
  • the PEG is EPA compliant to inject in the furnace.
  • the mixture of PEG and compound can be effective for dusting when transporting coal. Thus this combination functions as a dust inhibitor and slag suppressor.
  • a method for introducing a solid compound into a furnace.
  • the method comprises retrofitting a sootblower with a nozzle, such as nozzle 200 in Fig. 2 (step 910). Attaching the nozzle to a compound feed and receiving a compound into the nozzle (step 920). Supplying a fluid through a sootblower (step 930). Mixing the compound with the fluid (step 940). Transporting the compound and fluid through a feed tube into a utility furnace (step 950).
  • Various exemplary embodiments may further comprise, reacting the compound in the utility furnace (step 960).
  • the method includes removing the nozzle (which was installed in step 910) from the system (step 970).
  • a user may retrofit the nozzle by installing it on an operational sootblower in use on any utility furnace (step 910).
  • the user may separate the poppet valve and feed tube in a sootblower (step 12) and insert a nozzle by removably connecting the nozzle between the valve and the feed tube (step 914).
  • the fastening mechanism is removed.
  • this mechanism is a 600 pound flange with four 1 ⁇ 2 in NPT studs.
  • the user may need to replace the studs that originally held the feed tube and the poppet valve together.
  • the new studs may need to be longer in order to make up the new distance added by the nozzle. For example when placing a nozzle inline with some commercial feed tubes and valves, 2 inch longer studs may be used.
  • the user may reconnect the valve and the feed tube with the nozzle in between (step 916).
  • the user may attach the nozzle to a compound feed mechanism (step 920).
  • the compound feed mechanism may deliver compound to the nozzle in a number of ways.
  • the compound is drawn into the nozzle by a vacuum created at the nozzle. This vacuum may create a transport air stream.
  • the compound may be inserted into the transport air stream in a variety of ways including but not limited to physical force (e.g. an auger), pressure, gravity, or vacuum.
  • physical force e.g. an auger
  • pressure e.g. an auger
  • gravity e.g.
  • the transport air may be pressurized coming from the compound feed.
  • the pressurized feed can come from plant instrument air and connect at the transport air valve (512 of Fig 5 or 612 of Fig 6) of the compound feed mechanism.
  • the nozzle may only create a static or lower pressure condition. In which case the compound may be pumped to the nozzle in order to provide sufficient pressure to overcome the pressure at the nozzle.
  • fluid may be supplied through a sootblower (step 930).
  • the fluid supply may be initiated by opening the poppet valve.
  • the fluid supply may be initiated according to the individual operation of the sootblower or other fluid supply and delivery device.
  • the compound may be mixed with the pressurized fluid (step 940).
  • the compound may be combined with fluid supply into a laminar flow.
  • the compound may be control fed into the transport flow stream.
  • valve 608 may be opened after the sootblower is started.
  • transport air is pulled by a vacuum through the compound feed mechanism into the sootblower fluid stream.
  • the compound is forced through the nozzle by a pump.
  • the pump may be a part of the compound feed mechanism.
  • the compound may be delivered to nozzle 602 in response to the injection nozzle 620 being in the correct location in the interior of the utility furnace.
  • the delivery of the compound may be triggered by activating the transportation device which may be, for example, an auger feeder, transport air, or a pump.
  • the fluid stream pressures at the poppet valve can vary greatly.
  • the chemical injection port pressure i.e. the fluid pressure after the nozzle
  • the variations may be adapted to by adjusting the pressure created by the pressure device in compound feed mechanism and compound storage mechanism (for example, the pump, auger, and/or transport air).
  • the mixing or infusion may occur after fluid has been running through the sootblower. Due to the nozzle creating a vacuum, the peak impact pressure (i.e.
  • the pressure designed into the sootblower system as measured at the injection nozzle 620 to allow it to effectively move ash in a furnace may drop.
  • this pressure drop is compensated for by readjustment of the poppet valve. This compensation may thus prevent negative effects on the cooling flow of the lance tube and/or the peak impact pressure.
  • the mixture of pressurized fluid and compound may then be advantageously supplied to targeted portions of a utility furnace (step 950).
  • Such locations may normally be accessible only by means of the sootblower.
  • various elements away from the wall may be the target.
  • the wall may be the target.
  • sootblowers are located throughout substantially all of the utility furnace.
  • a user is able to deliver the mixture to a utility furnace through all types of manufactured sootblowers.
  • the use of any sootblower in the utility furnace allows for covering areas accessible by the sootblowers.
  • the delivery of the compound by the sootblowers installed on the utility furnace is possible without relying on flue gas. As such reliance on the changing flue gas flow dynamics is avoided.
  • the quantity of chemical delivered can also be minimized through the targeted effort.
  • the mixture may react with the targeted elements on the interior of the furnace (step 960).
  • Introducing the compound into a utility furnace may improve the efficiency of the furnace. This is done by impregnating the compound to affected slagging areas and chemically altering the buildup of pollution, slag, or other deleterious elements in furnace.
  • the device is configured to more easily remove the slag after first chemically reacting with the slag. In one example, this may allow the furnace to function on less fuel while maintaining substantially similar operating parameters.
  • the nozzles may be removed from the sootblower when finished distributing the compound into the furnace (step 970). This will restore the sootblower to its original condition.
  • the nozzle and compound feed mechanism may be stored for use on the same sootblower or they may be moved to another sootblower.
  • the nozzle and/or compound feed mechanism may be left in place for future use.
  • Coupled may mean that two or more elements are in direct physical contact.
  • coupled may also mean that two or more elements may not be in direct contact with each other, but yet may still cooperate and/or interact with each other.
  • couple may mean that two objects are in communication with each other, and/or communicate with each other, such as two pieces of hardware.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Incineration Of Waste (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Silicon Compounds (AREA)

Abstract

De manière générale, la présente invention peut porter sur des systèmes, sur des dispositifs, et sur des procédés d'injection d'un composé solide, en association avec un fluide sous pression, typiquement au moyen d'un dispositif de soufflage de suie, le composé solide étant destiné à être délivré à des zones cibles à l'intérieur d'un four à usage général.
PCT/US2010/059886 2009-12-11 2010-12-10 Système et procédé d'injection d'un composé dans un four à usage général WO2011072222A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/492,479 US9303870B2 (en) 2009-12-11 2012-06-08 System and method for injecting compound into utility furnace
US14/562,276 US20150086930A1 (en) 2009-12-11 2014-12-05 System and method for retrofitting a burner front and injecting a second fuel into a utility furnace
US14/563,648 US20150090165A1 (en) 2009-12-11 2014-12-08 System and method for retrofitting a burner front and injecting a second fuel into a utility furnace
US15/089,204 US20160290638A1 (en) 2009-12-11 2016-04-01 System and method for injecting compound into utility furnace

Applications Claiming Priority (2)

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US12/636,446 2009-12-11
US12/636,446 US20110132282A1 (en) 2009-12-11 2009-12-11 System and method for injecting compound into utility furnace

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US12/636,466 Continuation-In-Part US8817202B2 (en) 2008-12-12 2009-12-11 Lens sheet and display panel
US12/636,446 Continuation-In-Part US20110132282A1 (en) 2009-12-11 2009-12-11 System and method for injecting compound into utility furnace

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US9476582B2 (en) 2009-12-11 2016-10-25 Power & Control Solutions, Inc. System and method for removing slag inside a utility furnace

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CN109458625B (zh) * 2018-10-29 2023-11-07 华电电力科学研究院有限公司 一种用于大型电站锅炉水平烟道的智能声波吹灰装置及其工作方法

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WO2011072222A3 (fr) 2011-10-20
US20140026827A1 (en) 2014-01-30
US20110132282A1 (en) 2011-06-09
US9476582B2 (en) 2016-10-25

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