Additions and Betterments
Enhance the performance of new and existing power systems
Detroit offers a complete line of field-proven equipment to enhance the performance of new and existing power systems. All are the result of a century of experience in combustion technology and are supported by our worldwide service team. The following are a few examples of the many additions and betterments Detroit Stoker provides.
Ultrafeed Coal Distributor:
A high-volume, chain conveyor distributor that handles a broad range of coals. The Detroit® Ultrafeed is a chain conveyor distributor that provides even distribution of coal over the entire stoker grate surface. It is designed to efficiently handle a wide range of lignite and bituminous fuels including low grade coals which contain a higher percentage of moisture and fines. Each Ultrafeed unit is independently powered and has separatedrives for the fuel metering conveyor and the overthrow distributing rotor.
Variable speed control allows close monitoring of signals from modern combustion control systems.
Consider the Ultrafeed for:
- High volume coal distributing to meet greater demands
- Distribution of wet coal or fines
- Variations in coal quality when changing sources of supply
- A wider range and lower grades of coals, lignites to bituminous, with varying heating values
- Even distribution over your entire stoker grate surface
- Close following of a control signal from today's sophisticated combustion control systems
- Upgrading old equipment
- Ease of installation and maintenance
Airswept Fuel Distributor:
Ensures even distribution of fuel to the grate surface. The Detroit® Air Swept Distributor uses high pressure air to distribute fuel evenly across the grate surface both side to side and front to rear. By adjusting air dampers, the trajectory of fuel injection can be controlled. This allows modulation of the fuel flow from front to back of the grate. Distribution of fuel across the furnace is governed by the number and width of distributors used.
The Air Swept Distributor is shipped pre-assembled ready for quick installation.
Recycling and reduction of our world’s waste stream is not only environmentally necessary, it also makes good business sense. Many industrial processes produce solid wastes of high calorific value, ideally suited for energy recovery. Energy produced by burning waste products is recycling in its finest degree. Waste products such as bark, wood waste, shavings and sawdust, bagasse, grain hulls, coffee refuse, RDF, tire chips and others are excellent fuel choices. Such fuels are burned independently or in conjunction with other fuels, thereby offering cost effective options for meeting energy requirements and eliminating costly refuse disposal.
How the Distributors Work: Detroit Airswept Distributors are used to distribute refuse onto the grate surface. The fuel distribution system introduces the fuel to the furnace by a blanket of high pressure air sweeping the floor of the spout and spreading the fuel evenly on the grates, both side to side and front to rear. The number and size of distributors required to assure uniform fuel distribution is based on total grate width, length and fuel capacity.
When the refuse fuel is properly metered and continuously and automatically fed to the stoker distributing spouts, it is uniformly distributed into the combustion chamber by a source of varying air flow through the spouts.
The air supply has a rotating damper which cycles the air pressure and volume of air feeding the fuel to the furnace so that longitudinal distribution is achieved.
Fine particles of fuel entering the furnace are burned rapidly in suspension. Coarser, heavier particles of fuel are spread evenly on the grates forming a thin, fast burning fuel bed. The combination of suspension and thin fuel bed burning makes the stoker and boiler highly responsive to load variations.
Features and Benefits:
Erosion / Temperature / Impact Resistant
The distributors are fabricated with a variety of materials that provide the best heat, erosion and impact resistance. Stainless steel side plates, cast iron upper center plates, hard alloy bottom plates and removable chromium carbide distribution plates retard erosion caused by inconsistent fuel quality and a certain amount of abrasive material entrained in the fuel. Total stainless steel construction is available for extremely high temperature applications.
Simplicity of Design
One very distinct advantage of the air swept spout over a mechanical feeder is its simplicity. There are no moving parts in contact with the fuel. Tramp materials have the potential to damage a mechanical feeder, whereas, in the distributor spout materials are propelled into the furnace.
Factory Assembled
The air swept distributors are shipped completely assembled and are available in nominal widths of 12, 18, 24, 30, and 36 inches.
VacPak Ash Receiving Equipment:
99.9% separation efficiency meets the toughest emission requirements. The Detroit® VacPak combines separation and filtration in a single unit that occupies less space than conventional systems. Its ash receiver and separator remove heavy particles. Fine, suspended particles are trapped by a filter. This results in 99.9% separation efficiency. The VacPak combines integrated design and abrasion-resistant materials to minimize maintenance.
Supplied as a complete system, it is delivered with dust collector and blower units pre-assembled for quick installation.
Features and Benefits:
- Combines separation and filtration in a simple unit that occupies less space than typical systems
- The integrated design requires less maintenance and eliminates redundant ash discharge valves
- Operating efficiency of the mechanical blower is significantly greater than that of a steam exhauster
- Moisture condensing maintenance problems are virtually eliminated
- Dust collector and blower units are shipped assembled for easy installation
- Pulse jet type bags are easily replaced with side access doors or walk-in plenum
- System is rated to 20" Hg. Vacuum
- Air locks are available on higher capacity units for continuous discharge of material
- Alternative filter media are available to meet a variety of operating conditions and temperatures
- Utilizes solid state control system logic
Ultraflo Mixer:
Complete mixing with controlled material flow and uniform wetting. The Detroit® Ultraflo mixer blends dry materials including ash and sludge as well as abrasive or granular materials with a kneading action that uniformly mixes them with water. The totally enclosed design makes the Ultraflo mixer a perfect choice for conditioning dirty or dusty materials. It features a dual-shaft paddle system that eliminates the noise, leaking and wear experienced with drum-type mixers.
It features a dual-shaft paddle system that eliminates the noise, leaking and wear experienced with drum-type mixers. The paddles and mixing trough can be made from various alloys or supplied with special coatings for specific applications. The Ultraflo mixer is available in a range of standard sizes and can be customized to suit special requirements.
The Ultraflo is ideal for mixing and conditioning:
- Ash
- Sludge
- Other dusty and abrasive or granular materials
- Utility companies
- Industrial users of solid fuels
- Government and institutional installations
Features and Benefits:
- Complete mixing with controlled material flow and uniform wetting
- Totally-enclosed design for cleaner operation
- Rugged construction with heavy-duty drive for reliable operations and low maintenance
- Stationary mixing trough - no noisy, rotating drum to leak and wear
- Positive conveyance and blending with minimal material buildup on paddles
- Low-speed operation for minimal wear, low horsepower consumption
- Easy access for maintenance or removal of parts
- Paddles and/or mixing trough available with coatings or various materials of construction
- Available in a range of sizes and models - plus, can be customer-designed to suit your specific requirements
- Consistent discharge of manageable material for process or disposal
- An easy retrofit for replacement of your old drum-type conditioner/unloader or an existing mixer or pug mill
- Completely shop-assembled for simplified installation
- Additional optional accessory equipment, variations and specially-engineered adaptations also available
Underthrow Fuel Distributor:
As the power producing environment becomes more deregulated, companies are trying even harder to make greater use of less expensive fuels. Consequently, stoker operators are taking advantage of cost effective fuels such as coals of varying size, moisture and Btu content. These fuels, however, are often difficult to consistently and evenly distribute over the stoker bed. The Detroit® Underthrow Fuel Distributor is the ideal choice for spreader stokers burning coal containing a high quantity of fines and moisture.
The underthrow design of the rotor coupled with pneumatic assistance is a revolutionary change to fuel distributor products. The Underthrow distributor discharges the fuel on the underside of the rotor, enabling the blades to contact the coal for a longer period of time than other distributors. This design feature in conjunction with the pneumatic distributor plate, facilitates a more horizontal trajectory of fuel, therefore distributing the fine particles more consistently onto the bed area.
The Underthrow is primarily used for coal distribution for spreader stokers, and can be retrofitted to virtually any spreader stoker application. It can also be used with fluid bed boilers and to distribute other solid materials of similar size.
Features and Benefits:
Promotes Combustion Efficiency
- Ideal for distributing fuels inconsistent in size and moisture content
- Distributes fuels more consistently and evenly than other feeders
- Ideal for distributing fines and other inconsistent material at longer distances
- Improved distribution of fuel promotes less suspension firing resulting in lower loss of ignition
Cost Effective
- Our innovative design makes the Underthrow ideal for lower quality, less expensive fuel
Reduced Maintenance Time and Fewer Replacement Parts
- Fewer moving parts to maintain than other feeders
- The chain conveying carriage is protected from direct radiant heat exposure Reduces deterioration of parts from heat
- Reduces the need for replacement parts Internal parts removable in two main assemblies
- Carriage is readily removable as a single subassembly from the front of the distributor in a pullout module
- The rotor drum assembly is easily removed in a single assembly
- Internals can be replaced without removing feeder from the stoker front plate
Detroit Grate Drive:
With the Detroit® Direct Connected Mechanical Grate Drive, Detroit Stoker Company draws on more than a century of experience serving the industrial power and steam generating industry. This drive has been designed to reduce, and in some cases, eliminate many of the traditional problems associated with stoker grate drive operation and maintenance.
The grate drive can be readily installed as a replacement for existing installations and can be retrofitted to virtually any traveling grate system. The simplicity of design and ease of installation make it a definite winner for your stoker enhancement program. This mechanical grate drive provides the high quality and reliability you have come to expect from Detroit Stoker Company at an affordable price.
Features and Benefits:
- Simplicity of design - Easy conversion and fewer parts to maintain and stock therefore controlling maintenance labor and reducing inventory cost-the bottom line.
- Planetary gear box is directly coupled to drive shaft - Readily adapts to most existing arrangements and easy to install does not require significant modification to existing arrangement.
- Drive shaft is protected by shear pin coupling - Avoids costly repairs due to grate jams resulting in component failures and downtime.
- Continuous output torque - Eliminates ratcheting effect on grates equipped with hydraulic grate drives therefore reducing wear and tear on grates, chain, and other critical components.
- Mechanical design - Eliminates external hydraulic pump sets and leaking hydraulic cylinders resulting in fewer parts to maintain, a more open accessible arrangement, and a much cleaner operation. Planetary gear design operates at a much higher efficiency over standard worm gear or hydraulic grate drive designs.
- Variable Speed - Accepts 4-20 ma signal from boiler master enabling speed to be varied according to load demand.
- Reversible Action - Grate drive is capable of jogging forward and reverse to relieve jams caused by tramp material.
Overfire Air Control Systems:
Turbulence mixes secondary air for complete combustion. Strategically located, high pressure, air jets above the fuel bed create turbulence which interrupts the stratification of combustible gases and air above the fire. This forces mixing which leads to more complete combustion of gases. The system also increases the time for combustion and mixes fine fuel particulates with air to ensure complete combustion. The result of these actions is substantially improved efficiency, reduction of undesirable emissions and improved use of the combustion area.
Combination Fuel Feeder:
The Detroit Combination Fuel Feeder provides today's boiler operator with increased fuel flexibility by providing the option of burning coal and biomass/refuse fuels-individually or in combination. As a result, operators are able to take advantage of cost effective fuel options for meeting their energy requirements and substantially lowering their operating cost.
The Detroit Air Swept Distributor Spout was designed specifically for Biomass and Refuse fuels. Many industrial processes result in solid waste streams of high calorific value, which is ideally suited for energy recovery. Waste products such as bark, wood waste, sawdust, bagasse, grain hulls, coffee refuse, RDF, and tire chips, have all been burned successfully utilizing Detroit's Air Swept Distributor Spout technology.
Detroit® Clinker Grinder:
The Detroit Clinker Grinder is built for hostile operating environments. The rugged construction consists of rigidly stiffened rolled steel housing. The grinder enclosure is lined with cast Ni-Hard wear plates and grinder plates. The grinder teeth are all ni-hard cast and bolted for easy maintenance. The crusher roll is supported by external flanged roller bearings. Grinder seals are designed to withstand high temperature continuous operation. While the grinder has been most often used in power plants to handle ash clinkers, it can also be used for a wide variety of other friable materials.
