JPS61231391A - High-pressure steam condenser - Google Patents

Abstract

PURPOSE:To fix the temperature of condensate and enable safe operation of a boiler, by a construction wherein condensate is branched to a high-temperature side and a low-temperature side, and an automatic controlling valve is provided for controlling the mixing ratio of high-temperature condensate on the upstream side of a condensate zone and low-temperature condensate on the downstream side of the zone. CONSTITUTION:A steam A in a high-pressure steam condenser is fed into a steam header 1, from which it is led to an assembly header 3 while being condensed into condensate in a condensing (condensate part) zone 2. The condensate is branched into two directions, one portion is led to a sub-cooling zone 4, where it is further cooled to be a cold condensate C, which is led to a condensate header 5, and flows into a mixer 8. The other portion is led into the mixer 8 as a hot condensate B, and is mixed with the cold condensate C to be condensate D of an appropriate temperature. The temperature of the condensate is controlled to be a fixed value by providing a temperature control valve 7 on the hot condensate side and controlling the mixing ratio of the hot condensate.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a high-pressure steam condenser in which steam does not return to condensation and flows as it is, or condensate becomes supercooled and becomes too low temperature. It is used in the technical field to eliminate conditions that cause the pressure inside the vessel to fluctuate and enable stable boiler operation.

Conventional technology.

An overview of a conventional high pressure steam condenser will be described with reference to FIG.

Since the waste heat boiler of a waste incinerator uses waste as fuel, its calorific value is not constant, and the amount of steam generated also fluctuates greatly. An air-cooled high-pressure steam condenser is usually used to return the fluctuating steam A to condensation.

The steam first reaches a steam header 1 and is led to a condensation zone 2 where it is sequentially returned to condensate and reaches a collection header 3.

The condensate is then further cooled to a lower temperature (so that it is not flushed when discharged from the pressure regulating valve 12) through a subcooling zone 4 to the condensate header 5, where it reaches the pressure regulating valve 12. It is passed through and exited.

Air for returning to the condensate and cooling it is blown by a fan 1°. In order to keep the condensate temperature constant at this time, conventionally a method has been taken in which the blade angle of the fan 1o is changed to change the volume of cooling air to adjust the cooling capacity.

However, with this method, the air volume is changed only to keep the condensate temperature constant, so the ability to return steam to condensate, which is the original purpose of the condenser, is not adjusted to correspond to changes in the steam volume. The steam does not return to condensate and flows as it is, or the condensate becomes supercooled and becomes too low.

Furthermore, the pressure inside the vessel could not be handled by the pressure regulating valve alone and would fluctuate, resulting in unstable operation of the boiler and the like. This tendency becomes particularly noticeable when the condensate temperature is in a relatively high range (50° C. or higher).

As mentioned above, in the past, there were various problems because the condensate temperature was often not constant. (5
If it can be kept constant within the range of 0℃ to boiler saturated steam temperature,
Advantageous in terms of heat recovery, c).

It is necessary to keep the condensate temperature constant because the capacity of the high-pressure steam condenser can be reduced and the heat transfer area of the subcool zone can be reduced by increasing the condensate temperature.

Problems to be Solved by the Invention In order to maintain stable operation of the boiler, the present invention eliminates the fluctuations in the amount of steam that occur in the conventional example as described above, and maintains stable operation of the boiler by keeping the condensate temperature constant. The purpose is to carry out the following.

Means for Solving the Problems The present invention takes the following measures in order to solve the above-mentioned problems. In other words, the condensate is divided into a high-temperature side and a low-temperature side, and automatic adjustment controls the mixing ratio of high-temperature condensate before the condensate zone and low-temperature condensate after the condensate zone in order to keep the condensate temperature constant. Provide a valve.

Action.

According to the above-mentioned method (:), therefore, in response to fluctuations in steam volume, either the cooling air volume with the maximum amount of condensation capacity is kept constant, or the cooling air volume is adjusted to the condensation capacity according to the steam volume. The condensate temperature can be kept constant by mixing high-temperature and low-temperature condensate, making it possible to control the operation of equipment after the high-pressure steam condenser. It becomes possible to stabilize the temperature.

Embodiment Next, an embodiment of the present invention will be described in detail with reference to FIG. In the figure, the same reference numerals as in the conventional example described above indicate the same parts.

Steam A enters the steam header 1 and is returned to condensate in the condensation zone 2 until it reaches the collecting header 3°, where the condensate is split into two directions.

One of them reaches the subcool zone 4, where it is further cooled and becomes cold condensate C with a low temperature, and the condensate reaches the rudder 5.
Flows to mixer 8.

The other condensate is directly led to the mixer 8 as high-temperature thermal condensate B, where it is mixed with the cold condensate C to form condensate at an appropriate temperature. Constant control of the condensate temperature is achieved by installing a temperature control valve 7 on the heat condensate side and adjusting the amount of heat condensate. It also prevents steam from flowing to the heat condensate side. A drain trap 6 is installed for this purpose. Note that an orifice 9 is installed on the cold condensate side in case there is insufficient pressure loss.

The fan 10 that sends cooling air has a predetermined condensing capacity and has no air volume adjustment, or has a variable blade angle and can adjust the air volume.
Better control can be obtained by installing a steam flow meter 11 and changing the blade angle (air volume) so as to have a condensing capacity according to the amount of steam.

As described above, in order to keep the condensate temperature constant, the present invention does not adjust the cooling air volume, but divides the condensate into two, cold and hot, and adjusts the mixing ratio of each. It is something to do.

Effects of the Invention As described above, the present invention is capable of controlling the fluctuation of the amount of steam (in contrast, the amount of cooling air that has the maximum amount of condensation capacity is kept constant, or
Alternatively, the condensate capacity can be obtained according to the amount of steam by adjusting the cooling air volume (adjusting the fan blade angle), and the condensate temperature can be kept constant by mixing high and low temperature condensate. This enables stable operation of the turbine.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of the high pressure steam condenser of the present invention;
FIG. 2 is a system diagram of a conventional example. 1. Steam to ladder, 2. Condensation zone, 3. Collection header, 4. Subcool (condensate cooling section)
Zone, 5...Condensate header, 6...Drain trap, 7
・・Temperature control valve, 8・・Mixer, 9・・Orifice, 1
0...Fan, 11...Steam flow meter, 12...Pressure control valve, A...Steam, B...Heat condensate, C...Cold condensate, D...
Condensing. First diagram 1. pressure cell

Claims (1)

[Claims] A high-pressure steam condenser that returns steam generated from the waste heat boiler of a waste incinerator to condensate.The condensate is divided into a high-temperature side and a low-temperature side, and a condensate zone is used to keep the condensate temperature constant. A high-pressure steam condenser equipped with an automatic control valve that controls the mixing ratio of high-temperature condensate in the front and low-temperature condensate after the condensation zone.