JPS6333413B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plurality of autoclaves, particularly for curing foam concrete, in which waste steam from a cooled autoclave is transferred to a heated autoclave, and then live steam is fed under high pressure to the heated autoclave. Regarding how to drive.

When producing foam concrete, curing takes place in several autoclaves arranged in parallel. However, heating and cooling are not carried out simultaneously in all autoclaves, but are staggered so that the same amount of steam can be withdrawn uniformly from the boiler unit over a long period of time. In this case, the waste steam from one autoclave is usually used to exhaust heat the other autoclave at the same time as it cools down (Reinsdorf, Light Concrete, Vol. 2, Porous Concrete, pp. 141, 142, Fau. A.B. Verlag Fuur Bauwesen, Berlin;
(see 1963 publication). However, the waste steam from the cooled autoclave can only be transferred to the heated autoclave until the same pressure prevails in both autoclaves. In the known method, live steam is then supplied to the heated autoclave, and the residual waste steam of the cooled autoclave is partly discharged into the boiler room for heating the feed water and partly discharged into the atmosphere. Therefore, only a small amount of waste steam energy is utilized.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for operating a plurality of autoclaves for curing foam concrete, in particular of the type mentioned at the outset, which makes good use of the waste steam of the cooled autoclaves in a simple manner.

This object is achieved according to the invention by passing the live steam as injection steam through a steam ejector, the suction side of which is connected to the cooled autoclave for at least part of the heating cycle.

In the process of the invention, live steam is utilized to draw in additional waste steam from the cooled autoclave and pass it into the heated autoclave. Since the live steam must in any case be introduced into the heated autoclave and the steam ejector is a relatively simple device to manufacture, most of the waste steam still remaining in the cooled autoclave after pressure equalization in both autoclaves. can be used continuously in a heated autoclave. This improves energy utilization.

The method is preferably carried out as follows. This means that the steam is transferred directly from the cooled autoclave to the heated autoclave via a pipe until the pressures are balanced in both autoclaves, and only then is the cooled autoclave connected to the suction side of the steam ejector. This method has the advantage that in several autoclaves steam ejectors can be used which supply the waste steam of other autoclaves, and the waste steam from the other autoclaves also flows directly into the autoclave to be heated.

The method of the present invention will be explained in detail below based on the illustrated flow sheet.

For the sake of simplicity, only two of the autoclaves are shown in this drawing. The following description regarding these two autoclaves also applies exactly to the other autoclaves connected to the same line system. The autoclave 1 is connected to an autoclave 2 via an overflow pipe 3. Valve 4 in the overflow pipe for each autoclave 1, 2,
5 is provided. Furthermore, each autoclave 1, 2
A feed line 6 leads to each autoclave 1, 2, which can be shut off by a valve 7, 8 located therein. A live steam pipe 9 leading from a steam boiler (not shown) is connected to a steam ejector 11 through a valve 10, and the outlet of the ejector is connected to the feed pipe 6. Furthermore,
The overflow pipe 3 is connected to the suction side of the steam ejector 11 via a connecting pipe 12 with a further valve 13 interposed therebetween.
Furthermore, a residual steam line 15 which can be shut off by means of a valve 14
is provided in the coupling tube 12.

It is assumed that the pressurized left autoclave 1 is to be cooled, and the right autoclave 2, which is unpressurized, is to be heated. First, all valves are closed,
Valve 4 is then opened and valve 5 is slowly opened. Over a long period of time, the waste steam from the autoclave 1 now flows directly into the autoclave 2 via the connecting pipe 3 until an approximately equal pressure is established. Once the pressure is equalized, valve 5 is closed and valve 8 is opened. When the valve 10 is slowly opened, the live steam can flow into the steam ejector 11 as jet steam. Once the valve 13 is opened, the live steam sucks in other waste steam from the autoclave by the steam ejector 11, which reaches the autoclave 2 together with the live steam. Approximately 20% of the waste steam remaining in the autoclave 1 can thus be pumped into the heated autoclave 2.

As the back pressure inside the autoclave 2 increases, the steam ejector 11 gradually weakens.
The waste steam from the cooled autoclave 1 can no longer be pumped. Valve 13 is now closed,
Valve 14 is opened. The residual steam remaining in the autoclave 1 can be fed in a known manner to a heat exchanger through a residual steam line 15 for warming the feed water in the boiler room, or can be discharged into the atmosphere via an exhaust box. The autoclave 2 is now heated only by live steam.

Cool autoclave 2, then autoclave 1.
FIG. 2 shows that the device can also be operated in the reverse series using the same conduit for heating. This is indicated by an arrow pointing in the opposite direction. The various valves are opened according to the above-mentioned order,
This sequence is equally applicable to the reverse operation shown in FIG.

The method of the invention can of course be applied not only to the operation of autoclaves for the production of foam concrete, but also wherever products are treated with steam, for example to the operation of autoclaves for silica bricks.

[Brief explanation of the drawing]

Figure 1 shows the heating of the right autoclave 2,
FIG. 2 is a flow sheet showing the heating of the left autoclave 1. 1, 2...autoclave, 11...steam ejector.

Claims (1)

[Claims] 1. In a method for operating a plurality of autoclaves, especially for curing foam concrete, in which waste steam from a cooled autoclave is transferred to a heated autoclave, and then live steam is supplied to the heated autoclave under high pressure. , passing the live steam as injection steam through a steam ejector, the suction side of which is coupled to the cooled autoclave for at least part of the heating cycle. 2. A patent claim characterized in that the steam is transferred directly from the cooled autoclave to the heated autoclave via a pipe until the pressures are balanced in both autoclaves, and only then the cooled autoclave is connected to the suction side of the steam ejector. The method described in Scope 1.