DE8306847U1 - DEVICE FOR RECOVERY OF HEAT FROM A MIXTURE OF STEAMS LOADED WITH SOLID PARTICLES AND NON-CONDENSIBLE GASES - Google Patents

Description

Device for recovering heat from
a mixture of loaded with solid particles
Vapors and non-condensable gases

The innovation relates to a device for recovery

of heat from a mixture of solid particles ξ

vapors and non-condensable gases, especially f

from a mixture of this kind, which is produced by a plant for | production of paper stock using thermomechanical processes

is delivered. ;

A mixture of this kind is to be found in numerous industries

meet, especially in the industry of by thermo- |

paper pulp produced by mechanical processes. f

While performing these procedures, wood chips J

grated and shredded in a steam atmosphere. Well f

but mechanical defibration consumes a large amount \

of mechanical energy that is converted into heat. This 1

Heat is used to heat the fibers and the ·.

thinning water to compensate for the heat losses and to |

to generate part of the water vapor that is needed to maintain \

maintenance of the treatment atmosphere is required. *

That formed by this treatment atmosphere and under
The mixture withdrawn at elevated pressure forms a large heat source, the recovery of which is of economic interest

is. However, this mixture contains decomposition products of the ι

Wood in the form of various däcrofen and non-condensing I

i sierbaren gases, all more or less corrosive

and also contains resins, fibers and wood particles.
Conventional recovery devices can therefore not

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be applied.

If you want to recover the heat contained in this mixture, you have to use special recovery equipment that can withstand the polluted and corrosive nature of the mixture or before heat recovery carry out a pre-cleaning of the mixture.

The first solution is expensive to implement and requires extensive maintenance.

For the second solution, mechanical cleaning devices , for example filters or cyclones, have hitherto been proposed, which have proven to be complicated and expensive and always cause a pressure drop in the recovered steam, and consequently a loss of energy.

The object of the innovation is to create a device that avoids the disadvantages of the previous solutions.

The solution to this problem is carried out according to the innovation Subjects of the claims.

Advantageous further developments of the innovation are the subjects of the subclaims.

In addition to the dispositions in question, the innovation consists of certain other dispositions, which are preferred apply at the same time and are dealt with in detail below.

In the following a preferred embodiment of the The innovation is described using the drawing. Show it:

Fig. 1 is a schematic representation of the device

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after the innovation;

Fig. 2 is a more detailed schematic representation

development of an advantageous embodiment of the device according to the innovation.

1 and 2 show a system from which a mixture of vapors laden with solid particles and non-condensable vapors Gases is withdrawn. Such a plant can, for example, be a plant for the production of paper stock by thermo-mechanical Procedure.

According to the innovation, at least one of those contained in the mixture is Vapors, in this case water vapor, condensed. Before this vapor condenses, the mixture becomes cleaned, which comes from a plant for the production of paper stock. This is done by washing the mixture due to the condensate resulting from the condensation of the water vapor. The condensate is then together with the from dieeer Solid particles (especially waste and wood fibers) originating from cleaning are removed.

The condensate laden with waste and wood fibers becomes beneficial recirculated into the plant for the production of the paper stock.

According to FIGS. 1 and 2, the device for carrying out this method contains a washing chamber traversed by the mixture

2, a downstream of the washing chamber 2 arranged condenser

3, a device located in the washing chamber 2 and fed by at least a part of the liquid condensate originating from the condenser 3 for atomizing a liquid 4 and a device for removing the liquid condensate, the solid trapped in the washing chamber 2

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Particle is loaded.

The condenser 3 is of the free condensation type by sprinkling from top to bottom, with the steam arriving at the upper part and the condensate at the lower part is collected. This lower part is designed so that it can pass the non-condensable gases through a pipe 17 constantly withdraws that opens to the atmosphere and a flow control valve 18 has. This arrangement favors the removal of non-condensable substances with a Minimum loss of steam.

This removal device preferably ends in the plant 1 for producing the paper stock, which is a recirculation of the condensate laden with waste and wood fibers.

The extraction device according to Fig. 2 contains:

on the one hand a separating device for separating the solid particles from the washing condensate and

on the other hand, a removal device for removing the solid particles and part of the liquid condensate.

The separating device can work with flotation and have a flotation chamber 5 .

The extraction device can be formed by a drilling line 6 which opens below the free level 7 in the flotation space 5 and is provided with a valve S which is controlled by a device 9 for controlling the height of the free level 7 in the flotation space 5 in such a way that the Level 7 is maintained at a given height H ₁ below the mouth 6a of the pipeline 6.

The pipeline 6 opens into the plant 1 for 'production
of the paper stock.

The flotation chamber 5 is advantageous through the lower
Part of the washing chamber 2 is formed.

The capacitor 3 is preferably immediate and permanent
via a line 10 to the lower part of the washing chamber 2
tied together.

The atomizing device 4 is through a line 11 j

and a pump 12 fed from the flotation space 5. I.

To regulate the throughput rate to the atomizing device f

device 4 supplied liquid condensate is in line 11 \

a throughput control device 13 and a valve 14 are provided

see. . |

At the beginning of the line 11 in the flotation space 5 there is a pump f

basket 15 provided. f

The beginning 11a of the line 11, which is in the flotation space 5 j

located atomizing device 4 feeds., is located!

at a height H ₂ below the free level 7 in the flotation '<

room 5. This height is greater than the height H ₁ , which is the input! ·

immersion of the opening 6a of the *

Identifies pipeline 6. i

In this way you improve the separation between the for

the washing intended liquid condensate and the _{

Recirculation certain residual liquid condensate. '

With regard to washing, it should be noted that those with liquid |

Condensate-fed atomizing device 4 of this condenser |;

sat directly on the side walls 2a of the washing chamber 2 I

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splashes. The atomizing device 4 is located above the inlet 4 of the mixture in the washing chamber 2. The inlet 16 is preferably arranged tangentially. Due to this arrangement, the irrigation of the liquid washing condensate continues clean it on the side walls 2a and collect the particles centrifuged on the side walls 2a below.

The atomization device 4 is located in the upper part of the washing chamber 2 and is designed so that the water as uniform layer is atomized through which the vapor mixture introduced through inlet 16 must pass in order to to the outlet 19 on the upper part of the washing chamber 2 above the To reach atomization device 4.

This advantageous arrangement permits secondary washing of the vapor mixture to remove the fine particles therefrom to eliminate that were not deposited on the irrigated side walls 2a of the laundry room 2.

Finally, regardless of the embodiment used, the innovation has a certain number of advantages, of which the main ones listed below are:

- Almost all of the heat of the mixture of solid particulate vapors and non-condensable gases will be recovered. Finally, it prevents the use of part of the liquid condensate as washing liquid the entalpy loss that would result from the use of a scrubbing liquid, such as outside water, to cause a deconcentration phenomenon. The deconcentration takes place in the device according to the invention by emptying the condensate laden with solid particles into the system, from which the mixture from the Vapors and non-condensable gases are taken.

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- The pressure drop of the recovered steam is negligible in the washing device.

- The condenser is kept in a good clean condition, which eliminates any maintenance and corrosion problems.

- The removal of the solid particles from the mixture throws no environmental pollution problems, as this Particles are recirculated.

Finally, it should be noted that the capacitor 3 is advantageous can be used to form the evaporator of a heat pump, whose thermodynamic fluid e.g. through the water vapor is formed. Those in the condensation of water vapor of the mixture of vapors and non-condensable Heat recovered from gases is then used to evaporate the water, which is then used in a compressor (more conventional Compressor or compressor with water ring) is compressed. The heat pump formed in this way can with open or closed circuit work.

Claims (5)

··· ■ era f a r * - r 9 ^ _y G 83 06 0847.3 Air Industrie October 20, 1983 4, Q / my ANSPRÜCHE 1. Device for the recovery of heat from a mixture of vapors laden with solid particles and non-condensable gases, with a washing chamber and a condenser arranged downstream of the washing chamber and with an atomizer for a liquid arranged in the washing chamber,
characterized, that the atomizer (4) in the washing chamber (2) is in communication with the condenser (3). 2. Device according to claim 1,
characterized, that in the lower part of the washing chamber (2) a flotation space (5) is formed into which a suction pipe (6) opens, in which a valve (8) is arranged, which is connected to a control device (9) at a level (H.) above the mouth (6a) of the pipeline (6) is arranged to control the free level (7) in the flotation space (5). 3. Device according to claim 2,
j characterized by ί that the condenser (3) is connected to the flotation space (5) and the atomizer (4) is arranged above the flotation space (5). 4. Apparatus according to claim 2 or 3,
characterized, that the atomizer (4) is connected to the flotation chamber (5) via a line (11), the mouth (11a) of which is arranged in the flotation chamber (5) at a height (H ₂ ) - (7) which is below the mouth (6a) of the suction pipe (6) is located. 5. Device according to one of claims 2 to 4, characterized in that that the atomizer (4) is arranged so that he the liquid Directs condensate directly onto the side walls (2a) of the washing chamber (2), with the atomizer (4) above the inlet opening (16) of the mixture is arranged in the washing chamber (2), and the inlet opening (16) opens tangentially, and that a discharge opening. (19) is arranged in the upper part of the washing chamber (2) above the atomizer (4).