Industrial boilers
阅读：653发布：2021-07-19
专利汇可以提供Industrial boilers专利检索，专利查询，专利分析的服务。并且An industrial boiler including a fluid-fired burner and having means for feeding solid fuel to the combustion chamber, and there being a control means which is operable to control the burner and the feed means so that the burner can operate whilst the feed means is inoperative, and the feed means can operate whilst the burner is inoperative, and the burner can operate whilst the feed means is operative.，下面是Industrial boilers专利的具体信息内容。
1. An industrial boiler including a combustion chamber, a fluid fuel fired burner to cause combustion of said fluid fuel in said combustion chamber, a grate contained in said combustion chamber, air supply means for delivering air to said combustion chamber, feed means for feeding solid fuel to said combustion chamber so as to fall towards said grate and control means operable to control supply of fluid fuel to said burner and solid fuel by said feed means, said control means including a first sensing means to detect the presence of combustion of both fluid fuel and solid fuel, said first sensing means being effective to control operation of said feed means to control feed of solid fuel to said combustion chamber and to control supply of fluid fuel to said burner, and a second sensing means to detect the presence of combustion of the fluid fuel alone, said second sensing means being effective to control supply of fluid fuel to said burner, whereby said burner can operate whilst the feed means is inoperative, said feed means can operate whilst the burner is inoperative and said burner can operate whilst said feed means is operative.
2. A boiler according to claim 1, including an envelope, a steam/water space of the boiler contained within said envelope, said envelope comprising a shell through which extends at least one set of fire tubes for passage of products of combustion from said combustion chamber, said grate being totally enclosed within the overall dimensions of said shell, and means for continuously supplying solid fuel passing down through the steam/water space of the boiler to said grate.
3. A boiler according to claim 2, wherein the combustion gases flow from the combustion chamber in a first direction and the boiler includes a grit arrester, located close to the gas outlet from the boiler, arranged to extract grit entrained in the combustion gases, and a means for supplying air to said combustion chamber, to withdraw grit from the grit arrester and to return the grit to the combustion chamber.
4. A boiler according to claim 1, wherein the boiler includes a conduit extending upwardly from said combustion chamber through the shell of the boiler, means for feeding fuel to said conduit above the lower end thereof and distributing means for imparting an outwards throwing action to fuel leaving an outlet of said conduit, whereby there is obtained a substantial even distribution of fuel over said grate.
5. A boiler according to claim 4, wherein said outlet of said conduit is spaced above the grate of the boiler and a single tube is provided to transport and supply both solid fuel and compressed air into said conduit, and wherein said distributing means comprises a plurality of tangential air nozzles associated with said conduit.
6. A boiler according to claim 1, wherein the control means is operative so that, on starting up of the boiler and actuation of the air supply means, the burner is operated after a predetermined time interval, the feed means is rendered operative after a further predetermined time interval and the burner is rendered inoperative after another predetermined time interval.
7. A boiler according to claim 6, wherein the control means causes the burner to operate initially with a first, lower, output and then with a second, higher, output.
8. A boiler according to claim 7, wherein in use prior to the feed means being rendered operative, said burner is operating at said second output and such that, on said feed means being rendered operative, the burner then operates at said first output and subsequently ceases to operate.
9. A boiler according to claim 1, wherein the solid fuel is wood waste and the grate supports a refractory material so that in use, the grate and refractory material are heated by the combustion product from said burner.
10. A boiler according to claim 1, wherein the solid fuel feed means includes a storage hopper for containing the solid fuel, said storage hopper including a primary conveyor for feeding solid fuel to an output pipe along which the fuel is fed pneumatically to a conduit which depends downwardly from the top of the shell of the boiler and a secondary conveyor for feeding the solid fuel from the interior of the hopper to the primary conveyor.
11. A boiler according to claim 10, wherein the primary conveyor is a screw-conveyor and the secondary conveyor is an endless belt conveyor which extends over the full width of the hopper.
12. A boiler according to claim 11, wherein the primary conveyor is a screw-conveyor and the secondary conveyor comprises a series of parallel screw-conveyors extending from end to end of the hopper transverse to the axis of the screw of the primary conveyor.
13. A boiler according to claim 1, wherein means are provided for feeding air into the combustion chamber so as to pass up through the grate, the flow of air through the grate being such as to maintain particles of solid fuel which drop onto the grate in a fluidised state.
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