Improvements in Steam Generators.
Year: 1894

page_text: Date of Application, 2nd Apr., 1894
Complete Specification Left, 31st Dec., 1894-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Steam Generators.
GEORGE VICTOR PRIESTLEY Basinghall Street Chambers, Boar Lane Leels,
Engineer do hereby declare the nature of this invention to be as follows:-
A vertical exterior double "shoot" fixed to a steam boiler for destroying refuse,
the front compartiment of which contains dust fuel thrown on to a furnace by a
tappit stoker; and the outside compartment containing coarser refuse, falling thro'
a front opening on to the grate. The fire doors for opening on to the furnace may
be set at an horizontal angle to the boiler front.
A spiral conveyor pushes on the clinkers to the end of the furnace tube, which
are made to fall into a clinker pit, whence they are carried away by a swing
waggon. Small tubes are fastened to the sides of the bottom shells, projecting into
the flues, thro' which the hot gases circulate before reaching the chimney. The
raising of the refuse waggons to a greater height to feed the hoppers, is done
by hydraulic lifts.
This invention relates to furnaces for burning refuse and dust fuel and more
particularly to Livets Steam Generator No. 11,47200 when used for consuming
rubbish.
Above the lower boilers or generators and fixed to or upon the brickwork is
placed a vertical shoot preferably of a rectangular shape, and down which the
rubbish is fed to the grates below.
It is applicable whether one or two series of grate bars are used in the furnaces.
This shoot is divided into two compartments, the front one nearest the brickwork
for fine sifted dust, and the outer compartment for looser and coarser refuse only.
If there be two series of grate bars, the same vertical shoot is continued to
the lower, where it stops.
This shoot is placed midway between the furnace front, and on each side are placed
the doors, at an horizontal angle to the boiler front, and not parallel with it.
This however may be varied to suit requirements.
These doors may be either balanced or swung on hinges.
crown " of
Where the front compartment enters the furnace, and close to the "
the furnace, is placed a small mechanical stoker, which throws a quantity of fine
dust on the grates at any desired speed, and by using this appliance, the fine dust,
so difficult to burn in bulk, is got rid of, and the clogging of the grate bars,
avoided. Underneath this stoker is the opening for the coarser refuse to enter
upon the dead plate of the furnace. The two deliveries being kept distinct.
To convey away the clinker which falls off the end of the grate bars, I employ a
spiral conveyor or large worm, which is supported at both ends by suitable brackets,
and made preferably of chilled cast iron to withstand the heat, such conveyor being
slowly revolved at its furthest end by suitable mechanism.
At the extreme end of the furnace flue or tube, is the expansion chamber for the
retardation of the gases, which chamber I make into a clinker pit, having sloping
sides, and a lower shoot which leads down to a pair of doors, which open into an
arched chamber or passage, running at right angles to the boilers, and extending
across their whole width.
Into this passage, I place a swing truck which is made to lie close at the bottom
of the shoot, and into which truck, the clinker falls, and then led away to the

page_text: extreme end of the passage, and hoisted up to the working level or floor, and the
clinkers poured into a cart for removal. To increase the heating surface of
the whole installation, I place a number of small, vertical inclined tubes in the
flues, surrounding the lower steam boilers, both ends of which afford a good
heating and circulating medium.
At certain intervals, where the shells are rivetted together, I omit these tubes,
and such spaces afford an easy means of inspecting and repairing such tubes
without disturbing many.
In order to fill the refuse hoppers with material, I place a light iron tower
or structure in front of, and midway between the 2 bottom boilers, such tower
contains an hydraulic lift working rapidly, such waggons, are quickly raised to
the higher level and run across a light iron bridge or span, one end of which
rests upon supports fastened to the front boiler brickwork.
The waggons are wheeled on, and their contents upset into either of the
refuse hoppers.
Dated this 31st day of March 1894.
Improvements in Steam Generators.
GEORGE VICTOR PRIESTLEY, Basinghall Street Chambers Boar Lane Leeds
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to furnaces and generators for burning refuse and dust
fuel, and more particularly to Livets Steam Generator No. 11,472 when used for
consuming refuse.
According to my present invention, I employ a vertical exterior double shoot, to
the front of a furnace or furnaces of a steam boiler, the front compartment of
which contains the sorted or riddled dust fuel which is thrown onto the fire by a
tappit or shovel stoker, the other compartment of the shoot containing the coarser
fuel or refuse which falls by gravitation on to the front of the fire bars or dead-
plate.
The fire doors are set at a suitable angle to allow easy manipulation of the fuel
in the furnaces.
The employment of a spiral conveyor for travelling the clinker,-pushed off
the end of fire-bars-along the furnace tube utilizes the heat of the clinker to
the utmost, such clinker then falling into the clinker pit at end of boiler
as shewn in drawings. Such clinker pit is provided with suitable doors
opening in to a passage from which the clinker is removed by small waggons
& tramway.
"
I also employ steel tubes fastened into the shell of the boiler and projecting into
the flues, against which the hot gases impinge on their way to the chimney.
The refuse waggons for feeding the hoppers in front of boiler are raised to a
suitable height by hydraulic lifts and then carried forward by means of a light
front bridge leading to the hopper mouths, wherein their contents are emptied.
In order that my present improvements may be clearly understood, reference is
had to the accompanying illustrative drawings in which-
Fig. 1 shows a transverse section, and partly in front elevation; and
Fig. 2 a sectional plan of the shoot, fire doors, and furnace front.
Fig. 3 is a longitudinal vertical section through line A B. in Fig. 1.
1. is a vertical shoot, divided into compartiments 2 and 3, compartment 2 being
for the conveyance of dust-fuel and 3 for lump or coarse fuel. Hopper 4 at top end

page_text: of shoot is for the reception of both classes of fuel, and is divided by a partition to
keep the fuel separate and distinct.
The lower ends of shoot 2 are fitted with mechanical stokers or radial shovels for
projecting the dust in small and frequent quantities on to the fires. These stokers
may be actuated by any suitable mechanism fixed in front of boilers.
Compartment 3 is provided with apertures 5, the upper one opening on to dead-
plate 6, and the lower one on to deadplate 7, the boiler shewn being provided with
two sets of fire grates, superposed one above the other.
For this purpose,
I construct the furnace tube forming the fire boxes at front end, of a larger diameter
to allow for the fire grates being placed one above the other. The bottom of the
flue tube is at or near the level of the lower fire grates for the removal of the
clinker as described further on. The fire doors 8, opening on to the deadplate 6
and 7 are placed diagonally to front of boiler; by this means, the stoker has bet er
access to the fires, and can rake and spread the refuse from the deadplates on to the
fires with greater facility.
The fire bridges 9 and 10 are built flush with the top of grate bars, to allow the
stoker to project the clinker off the upper and lower grates on to the receiving
platform 11, from which it is conveyed slowly along the furnace tube 12, by means
of a spiral conveyor 13, shaft 14, and gearing 15, placed outside the downtake flue
wall 16.
The lower end of this downtake is formed into a pit 17, into which the clinker
falls from the end of the furuace tube 12, the clinker is allowed to remain in the
pit 17, till it has parted with all its available heat, and is then removed through
door 18, subterranean passage 19, and then into suitable hopper waggons or trucks.
I preferably construct the bottom of the clinker pit 17, at an acute angle to
facilitate the removal of the clinker through door 18.
To increase the heating surface of the boiler, I employ small steel tubes 20, the
ends of which are expanded into the lowest part of the boiler shell as at 21, and
the upper ends again inserted into the shell as at 22, and at a considerably higher
level.
The contour of the tubes 20, closely follows the cross section of the flues,
and are so disposed as to come into the direct path of the current of gases along
the flues.
To raise the refuse or fuel to a suitable height for the hoppers 4, I employ a
hydraulic or other suitable lift to raise side tipping waggons from the floor line 23,
to a light overhead tramway 24, running to the front of the boilers, and placed
equi-distant between the hoppers 4.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare what I
claim is-
1. In a steam generator of the kind herein referred to the employment of a
vertical exterior double shoot, serving either a single or double series of fire grates,
also the separate handling of the fine dust and method of utilizing same in small
and frequent quantities.
2. In a steam generator of the kind herein referred to-the employment of fire
doors set at a suitable angle to the face of the boiler, to allow more convenient
access for the raking and stoking of the fires.
3. In a steam generator of the kind herein referred to-the employment of a
suitable spiral conveyor for the slow removal of the clinker along the flue tubes,
with the suitable apparatus for actuating same.
4. In a steam generator of the kind herein referred to-the employment of fire
bridges, built flush with the top of grate bars to allow the clinker to be thrown off
the end and over the fire bridges.
5. In a steam generator of the kind herein referred to-the employment of a
clinker pit at extreme end of boiler, having an inclined base and doors for removal
of clinker thro' subterranean passage.

page_text: 6. In a steam generator of the kind herein referred to-the employment of steel
tubes bent to suitable shape and expanded in boiler shells, such tubes being placed
in the side flues substantially as shewn and described.
7. In a steam generator of the kind herein referred to, the method of handling
the fuel by means of suitable lifts and light tramway placed midway between the
hoppers.
8. My improved steam generator constructed and arranged as described and
shewn.
Dated this 27th day of December 1894.
GEORGE VICTOR PRIESTLEY.