STEAM GENERATOR BOILER
Compact Steam Boilers with Rapid Start-Up

QUICK ENTRANCE

Type DT & DTM

Steam Capacities 70 - 2,000 kg/hour

Working Pressures 3 - 190 bar gauge

Energy Source
(Fuel) Natural gas, LPG, bio-gas,
light and heavy fuel oil,
- and combinations hereof.

Efficiencies 90% - 92% *
95% - 97% **

The Product General Description

Design Sketch Horizontal / Vertical

Data & Dimensions Tables

Steam System Diagram

Chimney Design / Lay-out

Flue Gas Data Data & Calculations

Heat Recovery 'Economisers' (flue gas)

Alternative Type 1 Classic Fire-Tube Boilers

Alternative Type 2 Electric Steam Boilers

Steam table

*    Without Economiser
      (basic efficiency of the boiler design - can be adjusted)
**  Including Economiser
      (extra flue gas cooling - for instance water heating)

The efficiencies generally depend on the actual working loads and steam pressures. Special designs with extreme high efficiencies can be provided on demand - including special economizer solutions.

Steam Generator Boilers in Strong & Reliable Design

AB&CO · TT BOILERS are a well-known Danish steam boiler manufacturer, who have specialised in customised small and medium size industrial boilers.

The quality is supreme and the price is somewhat higher than the cheapest alternatives on the market. But the important technical features means that the long term costs are still much lower.

TT BOILERS Steam Generator Boilers types DT & DTM are compact industrial steam boilers for small steam capacities. The special water-tube design means that the steam/water volume is also very small. Consequently these steam boilers are starting up very fast, and at the same time 100% safe to operate (no risk of steam explosions).

          inquiry data sheet
          company introduction

     tools for thermal engineers

DETAILED DESCRIPTION & SPECIFICATIONS

	Easy & Safe to Operate - normally very few or no requirement on installation, start-up an operation from national authorities (depending on actual state law and regulation).
	Rapid Start-Up - from cold condition, which also means no energy consumption when no steam output.
	Compact - no large water volume thus small outer dimension. Easy to fit in almost everywhere
	Horizontal or Vertical Design ? - even more flexible to fit into an existing arrangement. Choose between the horizontal /vertical design.
	Environmental & Customised Design - Efficiency means low fuel consumption, low CO2 emission and low NOx emission. Thus this gives low operational cost and an environmental (green) profile. A customized design gives different options in this aspect - depending on the investment.
	Heavy Duty Design - Rigid design and constructed to withstand extreme pressure and temperatures - up to 350°C and 190 barg on request (as delivered for a test bench for safety valves for nuclear submarine)
	Price Attractive - both in purchase, but especially in operation. Particular supreme economy at small operation times with periods with no or low steam rates.
	Approved & Proven - by the most demanding customers and authorities worldwide. The basic design is 'battle proved' - the first units was put into service by TT BOILERS in the 70ties.
	Special Optional Features - also suitable for clean steam and pure steam

INTRODUCTION

TT BOILERS steam generator boilers type DT are industrial steam boilers with small and medium sized steam outputs.

They are developed and designed especially for reliability even during "heavy duty" operations - with no compromise on quality even though it mean higher purchase price. The focus is dedicated to ensure the best long term investment with lowest operational costs during the longest lifetime.

The pressure parts are designed as standard up to 40 bar pressure although operation pressure might between 3 - 10 bar (gauge). Pressure of 190°C and design temperature of 350°C on request.

The industrial type steam generator is also known as the steam generator boiler. It operates as a forced circulation water tube boiler. Unlike the conventional fire-tube steam boiler (fire/smoke tube boiler), the water in the steam generator boiler contains a very small amount of water and steam (equal the volume inside the pressure vessel i.e. inside the tube).

As listed up in the left column, this gives quite a few advantages.

The TT BOILERS steam generators are delivered in the range from 100 to 2,000 kg/h steam at design pressure going from 3 barg and all the way up to 190 barg (for special applications). These complete units are easy to install and does not require any special foundation; they can be place directly on a concrete floor.

The advantages are numerous - just image what you gain with a start-up time down to few minutes on the smaller sizes !

Steam Troll.JPG (23704 bytes)

Steam Generator - Vertical type

HIGH EFFICIENCY - LOW CO2 EMISSION

Type DT generally offers very high efficiencies equal low fuel consumption and low CO2 emission.

But special request on extra high efficiencies and extra low CO2 emission can be offered as a part of our general customized solution features. It costs a little more, but the overall cost are normally lower - and the environmental issue should also been taken into account.

Additional efficiency can be obtained by using an economizer (optional extra).

LOW NOx

The steam generators are prepared with combustion chambers for ensuring Low NOx when choosing an appropriate Low NOx burner. This design also offer high efficiencies. More green solution, often a request. The long term extra costs are very often modest due to the higher efficiency.

NOTE! Without a suitable combustion chamber design, no Low NOx burner can ensure environmental values with regard to NOx emissions - the boiler design is essential to ensure Low NOx.

EXTENT OF DELIVERY

DT steam generators can be delivered in horizontal execution (with low height), or in vertical execution (occupying limited floor space). They are delivered insulated with stainless steel cover sheets and complete with burner, armatures, instrumentation, safeties and a control panel - and with full documentation including necessary certificates.

All DT steam generators are carefully checked, controlled and function tested prior to dispatch from the workshop.

CONSTRUCTION

The steam generators heaters are made with coils made of seamless tubes, where the feed water is preheated and evaporated during the flow through these. The heat is transferred to the water/steam mixture as radiant heat in the combustion chamber, where the inner cylindrical tube coil and a flat tube coil forms the chamber wall and the bottom respectively. Consequently refractory concrete is avoided. The combustion gasses are hereafter cooled in the outer convection part, as the gasses pass the space between the two tube coils. The thermal design ensures a modest volume of steam relative to the size of the heater, and allows unlimited thermal expansion due to the high temperatures. All TT BOILERS steam generators and steam boilers are designed and equipped according to German TRD boiler regulations and Danish boiler regulations and corresponding EN-norms.

DT steam generators are made in carbon steel, but also different grades of stainless steel.

Stor_Coil_2_Cut.jpg (23562 bytes)

Making the Steam Generators

SPECIAL DESIGNS

Beside the standard execution the DT steam generators can be delivered in e.g. following variations:

Economizer increasing efficiency by extra utilization of waste heat in flue gas.
Steam buffer^TM
Complete skid-mounted with tanks and pre-treatment equipment.
Build in a container.
Material in stainless steel for clean steam applications.
Electrical heated, including EX-design (ATEX) when required.

DELUXE DESIGN

The best of the best is obtained by choosing from the special DANA Line alternative.

This is made by TT BOILERS and is the world's most exclusive boiler program.

BURNERS

As standard the heaters are provided by international recognized and only high quality burner brands - for natural gas, light fuel oil, heavy fuel oil and combinations (dual fuel). This include Low NOx burner designs. Demands for special burner designs can be fulfilled and adapted in the heater design.

STEAM GENERATORS
OR STEAM BOILERS ?

There are indeed some major differences between a steam generator and a classic 3-pass fire-tube steam boiler.

Advantages and disadvantages are present depending on the actual circumstances.

Read more about different type of steam boilers and about making the right choice on selecting the correct type of steam boiler. TT BOILERS manufacture both types and have no preferences in advising in favour of either type.

PRODUCTION OF CLEAN STEAM

TT BOILERS steam generators are also delivered for production of clean steam for food industry, pharmaceutical industry, electronically industry etc.

oil/gas-fired clean steam generator Tube coil of a clean steam generator steam generator with reboilers for pure steam

Sanitary steam (clean steam) for food applications are provided by a steam generator made in high grade stainless steel. The photo above shows a unit for Rolls Royce in UK which should also have other special features such as steam of 190 barg / 350°C. See more details here about clean steam.

For pharmaceutical industry a special grade of high quality sterile steam is used - so-called pure steam. The photo above shows steam generators with capacity of 300 kg/h and 600 kg/h - with reboiler, grinded and polished internally. See more details here about clean steam..

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Steam Generator - Low NOx

Type Horizontal type only	Steam Production [kg/h]	Heat Capacity [kW]	Oil · Gas Consumption [kg/h · Nm³/h]	A ** [mm]	B [mm]	C * [mm]	D [mm]	E ** [mm]	F [mm]	Weight Empty [kg]	Weight Full[kg]
DTM 125	125	87	8,5 · 9	1700	1300	800	550	550	Ø150	150	175

* Measurement including control panel , which can be placed anywhere or delivered separately.
** Measurement adjusted with respect to nozzles (inlet feed water, outlet steam) which are located at the front.

Type	Steam Production [kg/h]	Heat Capacity [kW]	Oil · Gas Consumption [kg/h · Nm³/h]	A [mm]	B [mm]	C [mm]	D [mm]	E [mm]	F [mm]	Weight Empty[kg]	Weight Full[kg]
DT 300/100	100	67	7 · 7	1,800	1,400	1,400	1,000	1,500	ø210	440	460
DT 300/150	150	100	10 · 10	1,900	1,400	1,400	1,000	1,500	ø210	445	465
DT 300/300	300	200	20 · 21	2,000	1,400	1,400	1,000	1,500	ø210	450	470
DT 300/400	400	266	26 · 28	2,100	1,400	1,400	1,000	1,500	ø210	455	475
DT 600/700	700	466	46 · 49	2,550	1,850	1,500	1,100	1,500	ø250	600	650
DT 1000/800	800	533	52 · 56	2,900	2,400	1,600	1,200	1,800	ø350	1,285	1,385
DT 1000/1000	1,000	666	65 · 70	3,100	2,400	1,600	1,200	1,800	ø350	1,300	1,400
DT 1000/1200	1,200	800	78 · 84	3,300	2,400	1,600	1,200	1,800	ø350	1,325	1,425
DT 1500	1,500	1,000	98 · 105	On request
DT 2000	2,000	1,333	130 · 139	On request

TABLE VALUES · Presumptions:
The below stated values for heat capacity and fuel consumptions are based on 80°C feed water temperature, 7 bar steam pressure, 90% efficiency and normal European quality light fuel oil (LCV=42 MJ/kg) and natural gas (LCV=40 MJ/Nm³)

CUSTOMIZED DESIGN
Note that special designs can be offered - adapted to the actual circumstances. Capacities, sizes, efficiencies, burner types, scope of supply and much more are provided at only very reasonable extra costs. The above table values only indicated the standard models.

STEAM GENERATOR BOILER Compact Steam Boilers with Rapid Start-Up

STEAM GENERATOR BOILER
Compact Steam Boilers with Rapid Start-Up