Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
  • C10J3/02—Fixed-bed gasification of lump fuel
  • C10J3/20—Apparatus; Plants
  • C10J3/30—Fuel charging devices
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2200/00—Details of gasification apparatus
  • C10J2200/09—Mechanical details of gasifiers not otherwise provided for, e.g. sealing means

Definitions

• This invention relates to a sealing system for a container closure, comprising a first and a second sealing surface and at least two concentric seals connected with one sealing surface each or formed by the design of one of the sealing surfaces.
• the sealing system according to the invention is suitable In particular for use in a coa! lock and/or ash lock of a fixed-bed pressure gasification reactor for producing synthesis gas by converting carbonaceous fuels, for example coal, coke or lumpy biomass, with gasification media.
• the invention furthermore relates to a method for leak testing of a lock closure equipped with the sealing system according to the invention.
• the document DE 4041445 A1 shows the basic construction of a closure frequently used for fixed-bed pressure gasification reactors.
• This type of closures consists of a seat with a circular opening and a conical or frustoconical closing body.
• the circumference of the opening of the seat comprises a circumferential edge which forms the sealing surface against which the closing body is pressed for closing the closure.
• lumpy material such as e.g. coal or coke
• the patent specification DE 32 39 841 C2 describes a conical closure which is equipped with a nozzle by means of which deposits are to be blown off from the sealing surface on closing of the closure.
• the actual seal is made of metal, and for additionally sealing the closure this invention provides a lip seal of flexible material which is installed on the pressure side, concentric to the metallic main seal.
• the lip seal is formed such that it is not pressed between metal surfaces, but by the gas pressure merely is pressed against the conical surface of the sealing body.
• the object is solved with the invention according to claim 1 for a sealing system according to the invention, according to claim 8 for a use of the sealing system, and according to claim 9 for a method for leak testing by using the sealing system according to the invention.
• the sealing system according to the invention for a container closure comprises a first and a second sealing surface and at least two concentric seals connected with one sealing surface each or formed by the design of one of the sealing surfaces, wherein the sealing surfaces and the seals are designed and arranged relative to each other such that in the closed condition of the sealing system a gas-tight space is formed by the sealing surfaces and the seals, which also remains gas-tight when the gas pressure existing In the same is greater than the ambient pressure.
• the sealing system is designed such that both seals are exposed to the closing pressure with which the sealing surfaces are pressed against each other and in the closed condition a gas-tight space is formed by the sealing surfaces and the seals.
• a preferred aspect of the invention is characterized in that the seals have a circular, oval, semicircular or approximately triangular cross-section tapered on the opposite side of the mounting surface. Due to this design, the contact surface of the seal with the opposite sealing surface is kept small, whereby deposits present on the sealing surface can impair the tightness less strongly. The same pressing force also results in a higher pressure against the opposite sealing surface as compared to seals with larger contact surface. It may be advantageous to provide further seals in addition to the at least two seals, which likewise are arranged concentrically, but further inside and further outside in radial direction with respect to the first seals. As seals of the described type are subject to wear, spare seals thus are provided, in order to ensure the safe closing of the container.
• a further preferred aspect of the Invention is characterized in that the seals are dimensionally stable, but elastically deformable. In this way, it is avoided that the seal is squeezed between sealing surface and closing body, wherein it is still possible, however, to compensate slight structural inaccuracies of the closure and slight deposits on the sealing surface by a deformation of the seal.
• Another preferred aspect of the invention is characterized in that the seals can be moved into the interior of the component carrying the sealing surface and the seal, in order to protect it against heat and abrasive media. In this way, the useful life of the seals is extended.
• a further preferred aspect of the invention is characterized in that the sealing surfaces can be cooled by means of a cooling medium.
• Another preferred aspect of the invention is characterized in that at least one of the sealing surfaces between the seals is provided with a first opening which is designed such that a fluid can be delivered through the first opening or a device for measuring the pressure or the temperature can be introduced into the gas-tight space formed by the sealing surfaces and the seals.
• Another preferred aspect of the invention is characterized in that at least one of the sealing surfaces between the seals is provided with a first and with a second opening, wherein the device for measuring the pressure or the temperature has been introduced through the first opening and the second opening is connected with a feeding device for a fluid, such as a purge gas, or a liquid, such as water, and wherein the first and the second opening are in fluid connection with the same gas-tight space.
• a fluid such as a purge gas, or a liquid, such as water
• the first and the second openings advantageously also can be used to introduce and discharge a gas or a liquid as flushing medium, in order to clean the seals and/or the spaced formed by the sealing surfaces and the seals.
• the use of liquids for example water, is recommendable here. It is also possible to introduce a fluid as blocking medium into the space formed by the sealing surfaces and the seals.
• the blocking medium which has a pressure that lies above the process pressure of the container or reactor, then prevents that process gas gets into the atmosphere in the case of a leakage of the seals. As a certain amount of blocking medium gets into the container or reactor, the blocking medium must be selected such that it does not disturb the process.
• the sealing system according to the invention is suitable in particular for use in a coai lock and/or ash lock of a fixed-bed pressure gasification reactor for producing synthesis gas by converting carbonaceous fuels, for example coal, coke or lumpy biomass, with a gasification medium, comprising oxygen and steam.
• a gasification medium comprising oxygen and steam.
• the method according to the invention for leak testing of the lock closure of the fuel lock or ash lock in a fixed-bed pressure gasification reactor comprises the following steps:
• the pressure of the lock space has been monitored so far for checking the tightness. Because of the size of this space, the pressure fluctuations are small in the case of smaller leakages and only are detectable after an extended measuring time.
• the spaced formed by the sealing surfaces and the seals, which is monitored during the leakage test according to the invention, is small, so that small leakages already lead to distinctly recognizable fluctuations of the pressure. Since the testing time for the leakage test thus has been shortened, production time hence is gained.
• a particular aspect of the method for leak testing is characterized in that after closing of the lock a purge gas is introduced into the same gas-tight space via a second opening, until the target pressure p is reached and the measurement of the pressure drop is made proceeding from the target pressure p.
• a harmless purge gas can be used, which in the case of a leakage of the sealing system can escape into the environment without danger.
• the gas-tight space also can be evacuated via the second opening by means of a vacuum pump, wherein subsequently the pressure increase is tracked in terms of time with the pressure measuring device, in order to infer the tightness in this way.
• the method according to the invention for leak testing of the lock closure of the fuel lock or ash lock in a fixed-bed pressure gasification reactor comprises the following steps:
• a feeding device which is connected with a first opening, wherein the feeding device comprises a conduit and a flow measuring device, e) measuring the flow rate when supplying the purge gas by using the flow measuring device, wherein a tightness of the lock is assumed, when the measured flow rate falls to zero when the purge gas is supplied. Due to this design of the method according to the invention the measurement of the pressure in the space formed by the sealing surfaces and the seals and the access to this space necessary for the pressure measurement can be omitted.
• test gas such as helium
• detectors for the test gas behind the sealing system in particular in direction of the atmosphere.
• helium the measurement by means of mass spectrometry for example can be used advantageously. In this way, a leakage would be detected.
• a flow measurement of the purge gas can be omitted in this aspect of the invention.
• FIG. 1 shows a schematic representation of a preferred configuration of the sealing system according to the invention.
• the closure 1 serves for sealing the container space 2 against the filling space 3, from which the non-illustrated bulk material slips into the container space 2, when the closure 1 is open.
• the closure 1 comprises the closure seat 4 and the closing body 5.
• the closing body 5 has the shape of a cone or truncated cone with circular base.
• the closure seat 4 fittingly has an opening circular in the top view.
• the closing body 5 is attached to a rod 6 and is moved up and down by a non-illustrated mechanism for opening and closing the closure 1.
• the first sealing surface 7 of the sealing system is provided by the closure seat 4, and the second sealing surface 8 is provided by the closing body 5.
• seals 9a and 9b are mounted concentrically to each other, which each have a triangular cross-section. They extend around the circumference of the closure seat 4 and thus in a top view have the shape of two concentrically arranged rings.
• a fluid e.g. an inert gas can be delivered into the space formed by the sealing surfaces 7, 8 and the seals 9a and 9b, which has the shape of an inclined circular ring with trapezoidal cross-section.
• Via line 11 the pressure in this space can be measured.
• the invention provides a sealing system for containers and reactors, whose tightness can be checked in a simple and effective way. Since the unwanted outflow of process gas generally must be avoided for economic and safety reasons, this invention is commercially appticable. Due to the methods for leak testing improved over those known from the prior art, the time period required for leak testing is shortened, whereby the availability of the plant, for example of the fixed-bed pressure gasification reactor, for the production is increased.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Examining Or Testing Airtightness (AREA)
• Gasket Seals (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54557368

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Citations (6)

Family Cites Families (4)

• 2014
  • 2014-10-31 DE DE102014115915.2A patent/DE102014115915A1/de not_active Withdrawn
• 2015
  • 2015-09-30 CN CN201520784362.4U patent/CN205295243U/zh active Active
  • 2015-09-30 CN CN201510654044.0A patent/CN105567334B/zh active Active
  • 2015-10-08 AU AU2015341098A patent/AU2015341098B2/en active Active
  • 2015-10-08 WO PCT/EP2015/025070 patent/WO2016066277A1/en active Application Filing

Patent Citations (6)

Also Published As

Similar Documents

Legal Events