JPS5852903A - Method and device for recovering drain in boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for recovering drain from a steam boiler.

The steam sent from the boiler radiates heat in a heat exchanger and condenses water, that is, the drain, which has a considerable amount of heat, and devices that recover this water and return it to the boiler have become particularly important in recent years from the perspective of energy conservation. has been done.

However, this conventional ridge device has a complicated structure, requires another power source to operate the entire device, and conventional devices that operate using their own steam energy are inefficient, and There is a problem in that when steam or air enters the drain pipe or pump, the inflow of drain is obstructed, making it impossible to recover drain.

The present invention has been made in view of the above points,
The pressure of the condensate itself is used as the energy used when condensate flows into the drain chamber of the pump, and before the condensate flows into the drain chamber, the condensate and gas are separated in a condensate reservoir, and the condensate is purified by clean gas. The gas in the drain pipe is discharged by a gas discharge operation valve operated by the clean water level of the drain, and the descent of the piston is stopped during this gas discharge operation, so that there is no risk of being affected by the gas in the drain. , yet very efficient drain recovery method with extremely low energy loss and its zP
+ The entire purpose is to provide equipment.

Next, one embodiment of the present invention will be described with reference to the drawings. 1st
The figure is a system diagram of the drain recovery device according to the present invention. In the figure, l is a boiler installed in the boiler room B, and the steam discharge pipe 2 of the boiler 1 is connected to a header 3. The steam distributed by the above is transferred to the heat exchanger 5a, which is a drain generation equipment, through each conduit 4 extending from the inside of the factory.
, 5b... has been added. The heat exchanger 5a, 5
The drain condensed in b is connected to the drain pipe 9 through drain pipes 6a and 6b, and a drain generating equipment switching operation is installed in the middle of the drain pipe 6a of the heat exchanger 5a which generates surface pressure drain. A valve Sv4 is provided, and a check valve 31 is provided in the middle of the drain pipe 6b of the heat exchanger 5b that generates low-pressure drain.

Furthermore, the drain pipes 6a and 6b become one drain pipe 6 and are connected to a drain reservoir 26. Above drain reservoir 2
6, a closed tank is used as shown in FIG. A gas discharge pipe 7 having an operation valve SV is connected to the drain feed pipe 6c having a check valve 8 at the bottom thereof.The other end of the drain feed pipe 6c is connected to the drain inflow hole lO of the pump 9. A drain discharge pipe 12 is connected to the drain discharge hole 11 of the pump 9 and is connected to the boiler l.
are connected via a check valve 13'z. The above Bonn f9
As shown in FIG. 2, a large-diameter 711 cylinder 15 and a small-diameter cylinder 16 are overlapped and communicated with each other internally, and a steam-side pressure receiving plate 17 is inserted into the large-diameter cylinder 15, A drain side pressure receiving plate 18 is inserted into the cylinder 16, and the steam side pressure receiving plate 17 and the drain side pressure receiving plate 18 are connected by a connecting rod 19. A piston 14 is formed by the drain side pressure receiving plate 18, the steam side pressure receiving plate 17, and the connecting rod 19, and the inside of the small diameter cylinder 16 and the drain side pressure receiving plate 1 are
The space created by the upper surface X of 8 is the drain chamber 20,
A space created by the inside of the large diameter cylinder 15 and the lower surface of the steam side pressure receiving plate 17 is a steam chamber 21 .

An upper limit switch Lu is located above the large diameter cylinder 15 to detect the upper and lower limits of the piston 14.
A lower limit switch LD is attached, and an air hole 23 is formed.

On the other hand, the conduit 4 that leads the steam to the heat exchanger 5a is branched to form a steam pipe 22, and the steam pipe 22 is connected to a steam inflow hole 24 communicating with the steam chamber 21 via a steam inflow operation valve SV+. ing. An orifice 25a is formed in a part of the steam discharge hole 25 communicating with the steam chamber 21, and the steam discharge hole 25 is connected to a discharge pipe 27 via a steam discharge operation valve 5Vze.

In addition, 28 in the figure is a water softener that softens the make-up water of the boiler L, and the water softener 28 is connected to the boiler L via a water softening tank 29 and a pump 30, and is present at various locations in the figure. 1. V is a manual control. 1. To explain the operation of the device with the above configuration, steam generated from the sweet potato boiler 1 passes through the steam discharge pipe 2 and enters the header 3, where it is brought to a predetermined steam pressure. regulated and connected by conduit 4 to each heat exchanger 5a, 5b
...is supplied to... The steam-mixed drain condensed in the heat exchangers 5a and 5b flows into the drain chamber 20 of the pump 9 from the drain hole IO through the drain reservoir 26 and the check valve 8 under its own pressure. There is, but here,
Each operation valve 5VI-8V2.Sv is operated as follows. First, the steam-mixed drain from the heat exchangers 5a and 5b flows into the drain reservoir 26, and the drain detector El+ in the drain reservoir 26 is operated. If the drain sensor E consisting of EB*E3 detects the presence of drain and this state of drain continues,
The discharge operation valve SV2 is opened, and the steam in the steam chamber 21 is gradually discharged through the orifice 25a. In this way, the drain gradually flows into the drain chamber 20 due to the pressure of the drain itself, and the piston 14° descends, and when the drain chamber 20 is filled with drain, the lower limit switch Ln detects this and the inflow operation valve SV+e Open and discharge operation valve Sv2 close. With this operation, the steam chamber 21
When steam flows into the drain chamber 20, the pressure receiving area of the steam side pressure receiving plate 17 is smaller than that of the drain side pressure receiving plate 18, so the piston 14 rises and the drain inside the drain chamber 20 is drained. , is sent to the boiler l via the check valve 13 and the drain discharge pipe 12.

Further, when air or steam enters the drain reservoir 26 during the descent of the piston 14 and the drain sensor E in the drain reservoir 26 detects that there is no drain, the discharge operation valve SV2 is closed and the piston 14 is lowered. At the same time, the gas discharge operation valve SV is opened, and the air or steam in the drain reservoir 26 and the drain pipe 6 is discharged into the atmosphere through the gas discharge pipe 7. Once the air or steam has been removed, the condensate flows back into the drain reservoir 26 and the above-described operation is repeated.

In this way, the steam energy used to recover the drain, that is, the steam energy flowing into the steam chamber 21, can be used very efficiently.

On the other hand, when the operating valve S4 is opened, the heat exchanger 5a
High-pressure drain flows into the drain reservoir 26, and
When the operating valve Sv4 is closed, the low-pressure drain from the heat exchanger 55b flows into the drain reservoir 26 without being affected by the high-pressure drain. This operation valve SV4 is
It is opened and closed at predetermined intervals using a timer, etc., and both the high-pressure side drain and low-pressure side drain can be recovered without reducing the pressure or adversely affecting the respective drain generation equipment. be able to.

In the embodiment described above, the check valve 31 is provided in the middle of the drain pipe 6b on the low pressure side, but the check valve 31 is not limited to this, and for example, an operating valve that is operated alternately with the operating valve SV may be used. It may also be used as a configuration.

As explained above, according to the present invention, the pressure of the drain itself is used as the energy used when drain flows into the drain chamber in the pump, and the drain reservoir is used to drain the drain before flowing the drain into the drain chamber. The drain clean gas and the gas in the drain pipe are discharged by a gas discharge operation valve operated by the drain clean water level, and the descent of the piston is stopped during this gas discharge operation. , Even if the condensate is mixed with gas, the condensate will surely flow into the drain chamber without applying special energy from the outside to make the condensate flow into the entire drain chamber, and this will allow the condensate to be collected. The energy needed to do this is just enough to push the drain into the Deira. Therefore, according to the present invention, the efficiency is greatly improved and the loss of energy 4゛i is extremely reduced. In addition, even condensate mixed with gas can be collected reliably, so there is no problem even if the pump is installed near the condensate generation equipment, and condensate from multiple condensate generation facilities can be collected together with one pump. This has the effect of reducing the cost of piping work, etc.

[Brief explanation of drawings]

The figures show one embodiment of the apparatus according to the present invention, and FIG. 1 is a system diagram thereof, and FIG. 2 is a diagram showing the configuration of the main parts. - 1... is empty, 6... drain pipe, 8, 13... check valve, 9... pump, 12... drain discharge pipe, 14
...Piston, 15...Large diameter cylinder, 16...
Small diameter cylinder, 17... Steam side pressure receiving plate, 18...
- Drain side pressure receiving plate, 7... Gas discharge pipe, 20... Drain chamber, 26-1 - Drain reservoir, SV,... Gas discharge operation valve, E... Drain sensor. Patent applicant Hoei Kogyo Co., Ltd.

Claims (2)

[Claims] (1) In a condensate collection method in which condensate is sent to all boilers by a piston that moves up and down inside the pump, the condensate
f: The pressure of the drain itself is used as the energy used to flow the drain into the drain chamber in the pump, and before the drain flows into the drain chamber, the drain and gas are separated in a drain reservoir, and the gas in the drain section is and a drain recovery method for a boiler, characterized in that the gas in the drain pipe is discharged by a gas discharge operation valve operated by the water level in the drain section, and the descent of the piston is stopped during the gas discharge operation. (2) In a drain recovery device that sends drain to a boiler by a piston that moves up and down inside the pump, the pump has a large diameter cylinder and a small diameter cylinder, and the large diameter cylinder and the small diameter cylinder are overlapped and communicated internally. Ori,
A steam side pressure receiving plate that constitutes a part of the piston is inserted into the large diameter cylinder, and a drain side pressure receiving plate that is connected to the steam side pressure receiving plate via a connecting rod is inserted into the small diameter cylinder. The drain chamber formed by the inside of the small diameter cylinder and the pressure receiving plate on the drain side is connected to a drain pipe that guides drain into the drain chamber and a drain discharge pipe that guides drain from the drain chamber to the boiler. The steam chamber formed by the inner and steam side pressure receiving plates is connected to a steam pipe having a steam inflow operation valve and a discharge pipe having a steam discharge operation valve, and is connected to the drain pipe and the drain chamber and the drain discharge pipe. A check valve is provided between the drain chamber and the drain pipe, and a drain reservoir and a gas discharge operation valve for exhausting the gas in the drain section and the gas in the drain pipe are provided on the upstream side of the check valve in the drain pipe. A drain sensor is provided in the drain section to fully open the gas discharge operation valve and close the steam discharge operation valve when the water level in the drain section falls below a predetermined value. A boiler drain recovery device.