WO2011085711A1

WO2011085711A1 - Device and method for furnace pressure stabilization with changing volumetric amounts of flue gas when changing firing during glass melting and refining processes in transverse-fired furnaces with regenerative heating units

Info

Publication number: WO2011085711A1
Application number: PCT/DE2010/075008
Authority: WO
Inventors: Rolf Wenning
Original assignee: Rolf Wenning
Priority date: 2010-01-18
Filing date: 2010-01-18
Publication date: 2011-07-21
Also published as: EP2526068A1; DE112010005144A5

Abstract

The object of the invention is to provide a device and a method for furnace pressure stabilization with changing volumetric amounts of flue gas when changing firing during glass melting and refining processes in transverse-fired furnaces with regenerative heating, in particular for flat glass production. According to the invention, a bypass (5) is used, arranged around the exhauster (3) and having a control valve (6) with a controller (8). The method for furnace pressure stabilization with changing volumetric amounts of exhaust gas when changing firing during glass melting and refining processes in transverse-fired furnaces (7) with regenerative heating units (1), a hearth control valve (2) and an exhauster (3) ahead of a flue (4) uses a control valve (6) of a bypass (5) when firing is about to change between two regenerative heating units (1). The control valve (6) is opened and, after the firing has been changed, the control valve (6) of the bypass (5) is closed again. The application area for the invention is that of glass production.

Description

Device and method for furnace pressure stabilization with changing volumes of exhaust gas during the change of firing in Glasschmelz- and Leuterpr ozessen in transverse flame pans with regenerative heaters

Device and method for furnace pressure stabilization with changing exhaust gas volumes during firing changes in Glasschmelz- and Leuterprozessen in cross flammenwannen with regenerative heating, a hearth control damper and a suction in front of a fireplace, especially for the

Flat glass position.

Various methods and devices for furnace pressure stabilization are already known. Thus, in DE 103 04 973 a control device for a system for melting and / or refining glass with control devices

described, which form at least two control circuit levels, wherein the control device has a linking device which a plurality of setpoints and / or

Actual values can link over more control loop levels and the control loop levels are hierarchically ordered and the at least one control device of the parent

Control circuit level comprises a first default means, with which of the at least one control device of

Subordinate control circuit level setpoints can be specified, the control device a first

Detection device for detecting at least one

superordinate controlled variable of the controlled variables volumetric number of bubbles, bubble size adjustment and content of dissolved gases in the glass melt for controlling the

Glass quality and the control device has a second detection means for detecting at least one

subordinate controlled variable of the process variables among other things the temperature, the atmospheric residual pressure in the

Läuterkammer, the Sauer stoffpar tialdruck the exhaust gas, the Furnace pressure in the melting tank and the pressure and / or

Volume flow of the protective gas. Furthermore, DE 1109326 describes a device for regulating the room pressure and exhaust gas outlet of fuel-fired industrial furnaces, in particular glass melting furnaces, in which an air flow directed against an opening of the furnace

Application takes place, being in the opening of the oven

Thermocouple is arranged, which via a known temperature controller, the servo motor arranged in the Blasluftleitung the air flow throttle body control t.

In conventional transverse flammenwannen for

Flachglasher position regenerators are used, which significantly improve the efficiency of the melting process. This is the usual tub sizes (600 - 800

Daily tonnes) with a reduction in natural gas consumption of 1000 Nm / h. To enable such an energy reduction is at discrete intervals the

Lighting side changed. This page change currently takes place every 20 minutes.

The melting and liquoring process in crossflame pans

is very sensitive to changes. A more frequent change of the firing side is not accepted, although the heat absorption capacity of the regenerators decreases rapidly and thus a reduction of the change time from energetic view would be desirable. Reasoning is adhered to the 20 minute cycle with that one

Fire change massive furnace pressure fluctuations result. Such furnace pressure fluctuations disturb the melting and Leuterprozess very. Moreover, it is understandable that constant pressure fluctuations load the side and end walls as well as the vault and lead to signs of fatigue, so that flaking occurs in the glass

find again and worsen the yield. A complicating factor is that flat glass manufacturers, due to the required pollutant limit values, exhaust gas cleaning need to use, consisting of a reactor (desulfurization) an e-filter (dedusting) and a denox (denitrification). In addition, modern systems additionally integrate boiler systems into the exhaust gas flow in order to utilize the waste heat for additional steam generation. Such complex systems, located in the exhaust gas flow between the

Melting furnace and the chimney, in turn cause additional, permanent and / or accidental

Pressure surges caused by switching on and off. The effects on the melting tank are in part quite comparable with the pressure fluctuations that occur when changing the lighting side.

The object of the invention is to provide a method and a

Furnace for stabilizing the furnace pressure with changing volumes of exhaust gas during the change of firing in glass melting and liquefaction processes in crossfire tanks

Regenerative heating as well as occurring pressure fluctuations by cleaning systems contained in the exhaust stream,

Detoxification systems and heat exchanger systems, especially for the flat glass to create position.

With the invention is achieved in the specified application, that a method and an apparatus for

Furnace pressure stabilization with changing

Exhaust gas volumes during the change of lights in glass melting and Leuterprozessen in cross flame pans with

Regenerative heating and pressure fluctuations caused by the contained in the exhaust stream cleaning systems, detoxification systems and heat exchanger systems is created, with the furnace pressure stabilization with changing exhaust gas volumes during firing changes in glass melting - and Leuterprozessen in cross flammenwannen with

Regenerative heating, a stove room damper and a suction cable in front of a chimney, with an incipient

Change of lights open the damper of the bypass and after the change of firing, the control valve of the bypass closed again and the negative pressure behind the oven space control flap thus strong, sudden

Reduction of the volume of exhaust gas to be sucked off is kept almost constant. It offers the possibility of one of the most negative process influences, the fluctuating

Furnace pressure at a fire change, significantly reduced by the negative pressure behind the furnace pressure control flap is kept virtually constant even with strong, sudden reduction of the exhaust gas volume to be sucked off. The bypass prevents the increase in vacuum. With this method opens up the possibility of the number of

Increase fire change. This increases the efficiency of the regenerators. Neither the massive

Furnace pressure control flap is still the sluggish, frequency-controlled

Induced draft can perform this rule work. Furthermore, with the inventive method heating cost savings he aims. Advantageous embodiments of the method are in the

Claims 2 to 5 and the device in claims 6 and 10 shown.

According to claim 2 as a secondary claim to stabilize the furnace pressure, the position of the control valve of a bypass can be changed and in addition the speed of a induced draft is set. In addition to the influences on the furnace pressure during firing changes, influences on the furnace pressure due to components and systems present in the exhaust gas stream can be compensated thereby, which increases the quality of the furnace

Glass production improved and significantly energy can be saved and thus costs are reduced.

In the development according to claim 3, the opening of the control flap according to the measurements of the open-air pressure sensor is adjustable, whereby the bypass to different sizes

Deviations from the setpoint can be readjusted individually.

According to claim 4, the opening control valve according to Measurements of the Abgasvolumenmengensensor s set, whereby the bypass can adjust to different sized deviations from the setpoint individually.

Due to the specific setting of the speed of the

Induced draft according to claim 5, the method is finer adjustable to the requirements. As a result, an increase in the quality of glass production is achieved and thus increases the yield. The energy requirement is lowered. In the device according to independent claim 6 is a bypass to the induced draft of a glass melting furnace for flat glass

arranged, which is controlled opened and closed at a change of fire. This makes it possible to significantly reduce the fluctuating furnace pressure during a fire change. The negative pressure behind the

This means that the furnace pressure control flap can be kept virtually constant, which improves the quality of the glass production process and reduces the energy requirement.

In the device according to additional claim 7 is for

Regulation of the furnace pressure a bypass around in the

Variable speed intake of a glass melting furnace for flat glass arranged, the

Speed control device is connected to the control of the bypass. This makes it possible to

differently caused furnace pressure fluctuations

to enter, whereby the fluctuations of the furnace pressure

are clearly reducible and thus the quality of

Glassmaking process is improved.

With the development according to claim 8, the control of the bypass is connected to a firing control, whereby the firing cycles are passed directly to the control of the bypass and trigger a control. The development according to claim 9 is the control of the bypass, which is connected to an open-air pressure sensor, which are routed to a direct way Abweidungen a setpoint of the furnace pressure sensor to the control of the bypass and trigger a readjustment. According to claim 10, the control of the bypass is connected to a Abgasvolumenmengensensor, which deviates directly from a desired value of the

Exhaust volume sensor s are passed to the control of the bypass and can trigger a readjustment.

Several embodiments of the invention are illustrated in the drawings and will become more apparent in the following

described. The drawing shows the process flow diagram of the solution according to the invention.

The inventive method, referred to as EQM (Equal Pressure Method), offers the possibility of one of

to significantly reduce the most negative process influences (fluctuating furnace pressure) during a change of fire by the

Negative pressure behind the oven air damper 2 even with strong, sudden reduction of the suctioned

Exhaust gas volume is kept quasi-constant. The process for furnace pressure stabilization in itself

Changing exhaust gas volumes during firing changes in glass melting and Leuterprozessen in cross flame pans 7 with regenerative heaters 1, a hearth control damper 2 and a suction 3 in front of a chimney 4, uses at a

incipient lighting change between two

Regenerativheizungen 1 a control valve 6 of a bypass 5. The control valve 6 is opened and after the

Change of lights, the control valve 6 of the bypass 5 is closed again. For this purpose, the control flap 6 has a controller. 8

The opening of the control flap 6 may additionally be adjustable according to the measurements of a furnace pressure sensor 10 and / or 10 'via the control or the opening of the control flap 6 may be adjustable according to the measurements of the exhaust gas volume sensor s 11. The fluctuations in the furnace pressure are also due to the connection or disconnection of existing in the exhaust stream cleaning systems 14, detoxification systems 14 and

Heat exchanger systems 14 caused. To minimize these influences, in addition to regulating the opening of the

Regulating flap 6 of the bypass 5, the speed of the induced draft 3 changes. The change in the speed of the induced draft 3 takes place here depending on the degree of opening

Control flap 6.

At constant speed of the induced draft 3 is a

Stabilization of the furnace pressure by changing the

Opening degree of the control valve 6 possible. As the melting and liquoring process in crossflame pans 7 is very sensitive to changes, it becomes one

frequent change of the firing side not accepted, although the heat capacity of the regenerative heaters 1 decreases rapidly and thus a reduction of

Switching time from an energetic point of view would be desirable. With the method according to the invention opens the

Possibility of changing fires from currently usual

To reduce change times every 20 minutes, d. H. the number of fire changes can be increased. The lower pressure fluctuations in the melting tank make shorter

Changing times possible, which increases the efficiency of the regenerators. The result is a projected natural gas consumption reduction of 100 to 200 Nm / h for conventional tank sizes (600 - 800 tons per day). In addition, the required negative pressure by the regulation of the induced draft 3 can be reduced to a minimum, which in addition to a saving of up to 50 kWh / h for the operation of the induced draft 3 entails. The significant reduction in pressure fluctuations reduces the risk of spalling. This will be the Number of foreign particles (pebbles) in the finished glass less.

The inventive device is used for

Furnace pressure stabilization with changing

Exhaust gas volumes during the change of firing in glass melting and Leuterprozessen in cross flame pans 7 with

Regenerativheizungen 1, which receive their combustion air 13 via conventional facilities. These systems conventionally have a hearth space control flap 2 and a suction draft 3 in front of a chimney 4. According to the invention, a bypass 5, which is arranged around the induced draft 3 and has a control flap 6 with a control 8, is used. This bypass 5 is opened regulated at a change of fire, Thus, the

Vacuum increase in the system prevented. Neither the massive oven air damper 2, nor the sluggish,

Frequency-controlled induced draft 3 can do this job. The controller 8 of the bypass 5 is advantageous with a lighting control 9, with at least one

Furnace pressure sensor 10 in front of the oven space control flap 2, a furnace pressure sensor 10 'after the hearth space control flap 2, a furnace pressure sensor 10' 'in the tub and / or with a

Exhaust gas volume sensor 11 is connected. In addition, to avoid by arranged in the exhaust stream

Cleaning systems 14, detoxification systems 14 and

Heat exchanger systems 14 caused

Oven pressure fluctuations the speed of the induced draft 3

changeable. For this purpose, the induced draft 3 to a

Speed control device connected. Compilation of the reference numerals

I - regenerative heaters

2 - Oven control damper, oven pressure control damper

3 - induced draft

4 - fireplace

5 - Bypass

6 - control flap

7 - Transverse flamescreen

8 - Control of the butterfly valve

9 - lighting control

10 - Furnace pressure sensor in front of the oven space control flap 10 '- Furnace pressure sensor after the oven space control flap 10' '- Furnace pressure sensor in the tub

II - exhaust volume sensor

12 - Speed control device

13 - combustion air

14 - Cleaning systems, detoxification systems,

Heat exchanger systems

Claims

claims

1. A method for furnace pressure stabilization with changing volumes of exhaust gas during the change of firing in glass melting and Leuterprozessen in transverse flammenwannen (7) with

Regenerative heaters (1), a hearth space control flap (2) and an induced draft (3) in front of a chimney (4),

characterized ,

- That at an incipient change of firing between two regenerative heaters (1) a control valve (6) of a

Bypasses (5) is opened and that after the

Change the control flap (6) of the bypass (5) is closed.

2. Method for stabilizing the furnace pressure with changing volumes of exhaust gas during the change of firing in glass melting and liquor processes in transverse flame pans (7)

Regenerative heating (1), a hearth space control flap (2) and an induced draft (3) in front of a chimney (4), as well as

Furnace pressure stabilization in the event of pressure fluctuations due to cleaning systems (14), detoxification systems (14) and heat exchanger systems (14), contained in the exhaust gas flow, (14), d a d e r c h e c e s e c e n e,

Bypasses (5) is opened and that after the

Change the control flap (6) of the bypass (5) is closed and

- That the speed of the induced draft (3) is adjustable.

3. Method according to one of the preceding claims, characterized in that

that the opening of the control flap (6) is adjustable according to the measurements of a furnace pressure sensor (10, 10 ', 10' ').

4. The method according to any one of the preceding claims, characterized in that the opening control flap (6) according to the measurements of

Exhaust gas volume sensor s (11) is adjustable.

5. Method according to one of the preceding claims, characterized in that

the speed of the induced draft (3) is constant and / or adjustable according to the degree of opening of the control flap (6).

6. Device for oven pressure stabilization in itself

Changing exhaust gas volumes during the change of firing in Glasschmelz- and Leuterprozessen in transverse flame pans (7) with regenerative heaters (1), a hearth space control flap (2) and a suction (3) in front of a chimney (4),

characterized ,

a bypass (5) is arranged around the induced draft (3), wherein the bypass (5) has a control flap (6) with a

Control (8) has.

7. Furnace for furnace pressure stabilization in itself

Changing flue gas volumes during firing change in glass melting and Leuterprozessen in transverse flame pans (7) with regenerative heating (1), a hearth space control flap (2) and a suction (3) in front of a chimney (4), and

- That a bypass (5) to the induced draft (3) is arranged, wherein the bypass (5) has a control flap (6) with a

Has control (8) and

- That the induced draft (3) with a

Speed control device (12) is connected, wherein the speed control device (12) with the controller (8) of the bypass (5) is connected.

8. Device according to claims 6 and 7,

characterized

that the controller (8) of the bypass (5) with a

Lighting control (9) is connected.

9. Device according to claims 6 to 8,

characterized ,

in that the controller (8) of the bypass (1) is equipped with at least one furnace pressure sensor (10, 10 ', 10' '), a

Furnace pressure sensor in the tub (10 ''), a furnace pressure sensor in front of the oven space control flap (10) and / or a

Furnace pressure sensor according to the oven space control flap (10 '), is connected.

10. Device according to claims 6 to 9,

characterized ,

that the control (8) of the bypass (5) with a

Exhaust gas volume sensor (11) is connected.