WO2010056000A2

WO2010056000A2 - Apparatus for recovering re-evaporated steam and condensate

Info

Publication number: WO2010056000A2
Application number: PCT/KR2009/006259
Authority: WO
Inventors: 최영한; 최병국
Original assignee: (주)영일펌프테크
Priority date: 2008-11-13
Filing date: 2009-10-28
Publication date: 2010-05-20
Also published as: JP2012508862A; CN102149985B; US20110214623A1; KR100898380B1; CN102149985A; JP5672615B2; WO2010056000A3

Abstract

The present invention relates to an apparatus for recovering re-evaporated steam and condensate, and in particular, to an apparatus for mixing the steam re-evaporated from condensate that is discharged from a heating unit for heating an object to be treated, with high-temperature steam supplied from a boiler, and for resupplying the mixed steam to the heating unit. To this end, the apparatus comprises: a steam recovery unit for recovering the condensate discharged from a heating unit for heating an object to be treated, and the steam re-evaporated from the condensate, and then supplying the recovered re-evaporated steam to a steam pressurizing unit and the recovered condensate to a boiler; and the steam pressurizing for mixing the re-evaporated steam supplied from the steam recovery unit, with high-temperature steam supplied from the boiler and then supplying the mixed steam to the heating unit. Therefore, with a closed circuit, the apparatus can recover the whole quantity of the re-evaporated steam and condensate for use, prevent the release of steam into the air and utilize a latent heat contained in the condensate, thereby improving the efficiency of energy consumption.

Description

Flash Steam and Condensate Recovery Units

The present invention relates to a re-evaporation steam and condensate recovery device, and more particularly, to the evaporation steam and the high-temperature steam supplied from the boiler by mixing the evaporated steam from the condensate discharged from the heating unit for heating the object to be heated to the heating unit A flash steam supply and a condensate recovery apparatus for supplying.

In general, a steam heating device is configured by connecting a condensate recovery device for supplying heating steam to a heating unit formed in a heat exchanger and discharging condensate generated by heating.

1 is a block diagram showing the configuration of a steam heating apparatus in the prior art. As shown in FIG. 1, a boiler 10 for forming a high temperature steam, a

heating unit

30 and 30 ′ supplied with the high temperature steam generated by the boiler 10 to heat the object to be treated, and heating Steam traps 40 and 40 'for discharging only condensate from the parts 30 and 30' and condensate discharged from the steam traps 40 and 40 'are collected, and a condensate tank 50 for supplying supplemental water from the outside. And a feed pump 51 for supplying the condensate collected in the condensate tank 50 to the boiler 10.

The condensed water fed to the boiler 10 by the feed water pump 51 is heated by a burner to be heated first through the header 20 and the

check valves

31 and 31 ′ in a high pressure super heated vapor state. It is supplied to the part 30 and the 2nd heating part 30 '.

The steam supplied to the first and second heating units 30 and 30 'is condensed while the temperature is lowered through heat exchange in the first and second heating units 30 and 30', so that a wetsaturated vapor state is obtained. do.

At this time, the condensed water generated by condensation of steam is collected in steam traps 40 and 40 'installed at the lower portions of the first and second heating units 30 and 30', respectively.

The steam traps 40 and 40 'are generally of a bucket or float type, and when a certain amount or more of condensate enters the steam traps 40 and 40', the bucket or float rises due to the buoyancy of the condensate. As a result, the valves 41 and 41 'of the steam trap are opened, so that only the condensate is discharged into the condensate tank 50.

Condensate discharged from the steam traps 40 and 40 'to the condensate tank 50 is partially evaporated to the atmosphere as the pressure decreases, and the remaining condensate remaining in the condensate tank 50 is mixed with supplemental water supplied from the outside to supply water. It is supplied to the boiler via the pump 51.

The replenishment water is generally provided by separately supplying the replenishment water tank 60 and the replenishment water supply pump 61, and of course, it is also possible to provide an on-off valve 62 in the line.

However, this conventional steam heating apparatus has the following problems.

Steam traps 40 and 40 'are preferably installed so that steam inside the heating units 30 and 30' is not discharged, so that latent heat contained in the steam does not escape to the outside of the heating units 30 and 30 '. Although a large amount of condensate discharged from the steam traps 40 and 40 'to the condensate tank 50 is evaporated and consumed into the atmosphere, energy efficiency is extremely low.

In addition, since the replenishment water must be continuously supplied as much as the amount of steam lost to the atmosphere, a large amount of water is required, and since the replenishment water at room temperature is mixed with a large amount of water, the water is supplied to the boiler 10 in a state where the temperature is lowered. There is a problem that a large amount of fuel is consumed.

Meanwhile, in order to improve the problems caused by the use of the steam trap, the steam trap is removed from the lower portions of the first and second heating units 30 and 30 ', and the first and second condensate can be collected by gravity. A technology for installing a closed water supply tank below the heating parts 30 and 30 'and forcibly supplying water from the closed water supply tank to the boiler through a water supply pump has been proposed.

However, the steam heating apparatus without the steam trap is capable of moving the condensed water by gravity, but there is a problem in that the thermal circulation is slowed because a differential pressure is not formed unless the discharge of steam (some air discharge) is performed.

In addition, cavitation occurs during operation of the feed pump for feeding the condensed water collected in the feed tank has a problem that the feed pump is broken.

In order to solve the above problems, the present invention mixes the evaporated steam re-evaporated from the condensate discharged from the heating unit for heating the object to be heated and the hot steam supplied from the boiler to re-evaporate steam and condensate of the boiler It is an object to provide a recovery device.

In order to achieve the above object, the present invention is a re-evaporation steam and condensate recovery apparatus of the boiler, recovering the condensed water discharged from the heating unit for heating the object and the steam re-evaporated in the condensed water, the recovered re-evaporated steam Is supplied to the steam pressurizing unit, The condensate is steam recovery unit for supplying to the boiler; And a steam pressurizing unit for mixing the re-evaporation steam supplied from the steam recovery unit and the high temperature steam supplied from the boiler to supply the heating unit.

The vapor recovery unit may include: an evaporation vessel connected to the heating unit to collect condensed water generated through heat exchange in the heating unit, and to recover evaporated vapor re-evaporated from the introduced condensate; And a feed pump for forcibly feeding the condensed water introduced into the evaporation vessel to the boiler.

In addition, the water level sensor is installed on one side of the evaporation vessel for detecting the level of condensate flowing into the evaporation vessel; And a water level control unit for outputting an operation control signal to the water supply pump according to the water level detected by the water level sensor to control the operation of the water supply pump.

The apparatus may further include an overflow valve installed at one side of the evaporation vessel to prevent an overflow due to condensate flowing into the evaporation vessel.

The steam pressurizing unit may further include: a steam recompression control valve configured to mix the high temperature steam supplied from the boiler and the flash steam supplied from the steam recovery unit to the heating unit; A pressure sensor installed between the steam recompression control valve and the heating unit to detect a pressure of steam supplied to the heating unit; And a pressure controller configured to control the operation of the steam recompression control valve by outputting an operation control signal to the steam recompression control valve according to the pressure detected by the pressure sensor.

As described above, the re-evaporation steam and condensate recovery apparatus according to the present invention has an advantage of recovering the entire amount of the re-evaporation steam and condensate in a closed circuit.

In addition, the re-evaporation steam and condensate recovery apparatus according to the present invention has the advantage that can improve the energy use efficiency by blocking the atmospheric release of steam, utilizing the latent heat contained in the condensate.

In addition, the re-evaporation steam and condensate recovery apparatus according to the present invention has the advantage that by reducing the use of steam and significantly reduce the consumption of fuel for steam generation by improving the energy use efficiency.

In addition, the re-evaporation steam and condensate recovery apparatus according to the present invention by removing the steam trap that causes a disturbance in the energy flow to continuously increase the flow rate of steam, thereby increasing the heat permeability and thereby maximizing the heat exchange efficiency to improve the heat transfer effect There is an advantage to this.

1 is a block diagram showing the configuration of a steam heating apparatus according to the prior art.

Figure 2 is a block diagram showing the configuration of a boiler system using a flash steam and condensate recovery apparatus according to the present invention.

Figure 3 is a block diagram showing the configuration of the flash steam and condensate recovery apparatus according to the present invention.

Figure 4 is a cross-sectional view showing the configuration of the steam recompression control valve of the flash steam and condensate recovery apparatus according to the present invention.

5 and 6 are waveform diagrams showing the amount of steam used per hour before and after the installation of the flash steam and condensate recovery apparatus according to the present invention.

7 and 8 are waveform diagrams showing the hourly fuel consumption before and after the installation of the flash steam and condensate recovery apparatus according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a block diagram showing the configuration of a boiler system using a flash steam and condensate recovery apparatus according to the invention, Figure 3 is a block diagram showing the configuration of a flash steam and condensate recovery apparatus according to the present invention, Figure 4 Is a cross-sectional view showing the configuration of the steam recompression control valve of the re-evaporation steam and condensate recovery apparatus according to the present invention.

First, repeated description of the same components as in the prior art will be omitted, and the same reference numerals are used for the same components as the prior art.

As shown in Figures 2 to 4, the re-evaporation steam and condensate recovery apparatus according to the present invention, the boiler 10 for forming a high temperature steam, and the high temperature steam generated in the boiler 10 is the header 20 Steam to supply the first heating unit 30 and the second heating unit 30 'and the steam for heating the first and second heating units 30 and 30' to be supplied through the heating unit to be heated. A steam recovery water 200 for collecting the condensed water discharged from the pressurizing part 100, the first and

second heating parts

30 and 30 ′, and recovering the flash steam generated in the condensed water; The evaporated steam connection pipe 300 for supplying the re-evaporated steam recovered from the 200 to the steam pressurizing unit 100, preferably made of a closed circuit.

The steam pressurization unit 100 is configured to mix the high temperature steam supplied from the boiler 10 and the flash steam supplied from the steam recovery unit 200 to supply the first and second heating units 30 and 30 '. The steam recompression control valve 110, the pressure sensor 130, and the pressure controller 140 are included.

The steam recompression control valve 110 mixes the high-temperature steam supplied from the boiler 10 and the re-evaporated steam supplied from the steam recovery unit 200 through the evaporation steam connecting pipe 300 to form the first and second steams. It is supplied to the heating part 30. 30 '.

Referring to the steam recompression control valve 110 in more detail, the hot steam inlet 111 through which the high temperature steam supplied from the boiler 10 flows in, and the flash steam from the steam recovery unit 200 flows in. The re-evaporation steam inlet 112, the steam discharge port 113 is discharged by mixing the hot steam and the re-evaporation steam, and the actuator 120 for controlling the on / off operation of the steam recompression control valve 110 And the opening / closing rod 121 which moves according to the operation of the actuator 120 and the opening / closing rod 121 of the actuator 120, the high temperature steam inlet 111 and the steam outlet according to the operation of the actuator 120. Opening and closing the first opening and closing portion 122 for opening and closing the first through hole 114 connecting the 113, and the second through hole 115 connecting the flash steam inlet 112 and the steam discharge port 113. It includes a second opening and closing portion 123.

Therefore, the steam recompression control valve 110 when the high temperature steam (solid arrow) flows into the high temperature steam inlet 111 and is ejected through the first through hole 114 to the steam outlet 113, the vaporization steam inlet ( The pressure drop phenomenon occurs in the second through-hole 115 of 112, and thus, the surrounding air is sucked and a vacuum pressure (negative pressure) is generated so that the flash steam (dotted arrow) is hot steam (solid arrow). It is mixed with and ejected.

The pressure sensor 130 is installed between the steam recompression control valve 110 and the first and second heating units 30 and 30 'and supplies the steam to the first and second heating units 30 and 30'. As the configuration for detecting the pressure, preferably the pressure of the steam discharged to the steam discharge port 113 of the steam recompression control valve 110 and supplied to the first and second heating units 30 and 30 ', The pressure value of the detected steam is provided to the pressure controller 140.

The pressure controller 140 outputs an operation control signal to the steam recompression control valve 110 according to the pressure detected from the pressure sensor 130, and controls the operation of the steam recompression control valve. By analyzing the pressure value of the steam detected from the 130, and outputting the operation control signal of the actuator 120 installed in the steam recompression control valve 110 in accordance with the analysis result, the first and second heating unit ( 30, 30 ') to adjust the pressure of the steam to be supplied.

Meanwhile, in the present embodiment, the pressure sensor 130 and the pressure controller 140 have been described as examples, but the design of the pressure sensor 130 is changed to a temperature sensor for detecting the temperature of steam, and the pressure controller 140 is described above. It will be apparent to those skilled in the art that the design may be changed to a temperature control means for outputting an operation control signal of the actuator 120 according to the temperature detected from the temperature sensor.

The steam recovery unit 200 recovers the condensed water discharged from the first and second heating units 30 and 30 'and the steam re-evaporated from the condensed water so that the condensed water is the boiler 10 and the re-evaporated steam is the steam pressurizing unit. As a configuration to be supplied to the 100, respectively, the evaporation vessel 210, the water supply pump 220, the water level sensor 230, the water level control unit 240 and the overflow valve 250 is formed.

The flash vessel 210 is connected to the first and second heating units 30 and 30 ', and the condensed water generated through heat exchange in the first and second heating units 30 and 30' is checked. 41, 41 ') is discharged to be introduced, and the evaporated steam separated by re-evaporation from the condensed water recovered by the evaporation vessel 210 is recovered and supplied to the steam recompression control valve 110.

That is, the evaporation vessel 210 is accommodated together in a state in which the condensed water and the flash steam are separated to selectively discharge the condensed water and the flash steam.

In addition, the evaporation vessel 210 may be installed at the same height as the height at which the first and second heating parts 30 and 30 'are installed, and is higher than the height at which the first and second heating parts 30 and 30' are installed. It may be installed at a lower place, and may be installed at a height higher than the height at which the first and second heating units 30 and 30 'are installed, but preferably, the height at which the first and second heating units 30 and 30' are installed. It is installed at a lower location so that condensate can be moved more easily through the natural fall due to gravity.

The feed pump 220 allows the condensed water introduced into the evaporation vessel 210 to be forcedly supplied to the boiler 10.

The water level sensor 230 is installed at one side of the evaporation vessel 210 to detect the level of condensed water flowing into the evaporation vessel 210.

The water level controller 240 analyzes the water level detected by the water level sensor 230, and outputs an operation control signal for controlling the operation of the water feed pump 220 according to the analyzed result to the water feed pump 220.

The overflow valve 250 is installed on one side of the evaporation vessel 210 to prevent overflow of the condensate when an excessive amount of condensate is introduced into the evaporation vessel 210, and one side of the overflow valve 250 is It is connected to the evaporation vessel 210 and the other side of the overflow valve 250 is connected to the replenishment water tank 60 so that the condensed water due to the overflow is discharged to the replenishment water tank 60.

Reference numerals

31 and 31 ′ are check valves, and perform opening / closing operations so that steam supplied from the steam pressurizing unit 100 selectively flows into the first heating unit 30 and the second heating unit 30 ′.

In addition, reference numeral 61 is a supply pump for supplying water from the supplemental water tank 60 to the boiler 10, and reference numeral 62 is a valve.

The following describes the operation of the flash steam and condensate recovery apparatus according to the present invention.

In the initial operation, hot steam heated in the boiler 10 passes through the header 20 and pressurizes steam until the temperatures of the first and

second heating units

30 and 30 ′ reach a temperature preset by the user. Continuously supplied to the steam recompression control valve 110 of the part (100).

In the initial operation, since the temperature of the first and second heating units 30 and 30 'is low, a large amount of condensed water is generated in the first and second heating units 30 and 30' during heat exchange. Flows into the evaporation vessel 210 via check valves 41 and 41 '.

The water level control unit 240 detects the condensate level in the evaporation vessel 210 through the water level sensor 230, and operates the feed water pump 220 when the level of the detected condensate reaches a predetermined level. Condensate in 210 is fed to the boiler (10).

In addition, when an excessive amount of condensate flows into the evaporation vessel 210 and an overflow of the condensate occurs, the overflow valve 250 is operated so that the condensate generated due to the overflow is sent to the supplement water tank 60. do.

On the other hand, when a certain time elapses after the initial operation, re-evaporation occurs in a part of the condensate introduced into the evaporation vessel 210, wherein the re-evaporated steam is a steam recompression control valve through the evaporation steam connection pipe 300 ( Is supplied to the flash steam inlet 112 of 110.

The flash steam supplied to the flash steam inlet 112 is formed between the flash steam inlet and the steam outlet 113 while hot steam flowing through the hot steam inlet 111 is discharged to the steam outlet 113. A vacuum pressure (negative pressure) is generated around the second through hole 115, whereby the flash steam supplied to the flash steam inlet 112 is sucked, and the steam is discharged through the steam outlet 113 together with the hot steam. It is supplied to the 1st and 2nd heating part 30 and 30 '.

In other words, the efficiency of energy use can be improved by recovering and reusing steam that has been discarded, and the flow rate of steam can be continuously increased due to the differential pressure generated by vacuum pressure in a closed circuit, thereby increasing the heat permeability. The heat exchange efficiency can be improved.

When the first and

second heating units

30 and 30 ′ reach a predetermined temperature and the pressure of the steam detected from the pressure sensor 130 reaches a predetermined pressure, the pressure controller 140 controls the operation by the actuator 120. A signal (off signal) is output to end the operation of the steam recompression control valve 110.

Afterwards, when the temperature of the first and

second heating units

30 and 30 ′ is dropped and the pressure of the steam detected by the pressure sensor 130 is lowered, the pressure control unit 140 turns on the operation control signal (on) to the actuator 120. Signal) to control the steam recompression control valve 110 to operate.

Accordingly, while the hot steam is supplied to the first and

second heating units

30 and 30 ′ through the steam recompression control valve 110, the steam re-evaporated in the evaporation vessel 210 is converted into a steam recompression control valve ( Due to the vacuum pressure (negative pressure) generated in 110, it is sucked and supplied to the first and second heating units 30 and 30 'so that the flash steam can be used.

5 and 6, and 7 and 8 are waveform diagrams showing the amount of steam consumption and fuel consumption per hour before and after installing the flash steam and condensate recovery apparatus according to the present invention, respectively.

As shown in FIG. 5, the amount of steam used per hour before the installation of the re-evaporation steam and the condensate recovery device according to the present invention was about 6,000 Kg / hr, but the amount of steam used per hour after the installation was shown in FIG. 6. An average of about 4,000 Kg / hr was used, indicating that the use of flash steam reduced about 2,000 Kg / hr of steam usage.

In addition, as shown in FIG. 7, the amount of fuel consumed per hour before installing the flash steam and condensate recovery device according to the present invention was about 660 l / hr on average, but the amount of fuel consumed per hour after installation was shown in FIG. 8. On average, about 430 liters / hr was consumed, indicating that fuel consumption of about 230 liters / hr was reduced by the use of flash steam.

Therefore, the amount of steam supplied from the boiler 10 can be reduced by the amount of flash steam generated in the evaporation vessel 210, and the amount of steam supplied from the boiler 10 is consumed in the boiler 10 as the amount of steam is reduced. The fuel consumption can be reduced.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many as possible without departing from the spirit of the present invention as set forth in the claims below. Changes may be made.

Claims

A device for recovering steam and condensate from boilers,

A steam recovery unit for recovering the condensed water discharged from the heating unit heating the object to be treated and the steam re-evaporated in the condensed water, supplying the recovered re-evaporated steam to a steam pressurizing unit, and supplying the recovered condensed water to a boiler; And

And a steam pressurizing unit for mixing the flash steam supplied from the steam recovery unit with the high temperature steam supplied from the boiler and supplying the steam to the heating unit.

The steam pressurizing unit is a steam recompression control valve for mixing the hot steam supplied from the boiler and the flash steam supplied from the steam recovery unit to supply to the heating unit; A pressure sensor installed between the steam recompression control valve and the heating unit to detect a pressure of steam supplied to the heating unit; And a pressure controller configured to control the operation of the steam recompression control valve by outputting an operation control signal to the steam recompression control valve according to the pressure detected by the pressure sensor. .
The method of claim 1,

The vapor recovery unit is connected to the heating unit and the condensate generated through the heat exchange in the heating inlet, the evaporation vessel for recovering the evaporated vapor re-evaporated from the introduced condensate; And

Re-evaporation steam and condensate recovery apparatus comprising a water supply pump for forcibly feeding the condensed water introduced into the evaporation vessel to the boiler.
The method of claim 2,

A water level sensor installed at one side of the evaporation vessel and detecting a level of condensate flowing into the evaporation vessel; And

And a water level control unit for outputting an operation control signal to the water feed pump according to the water level detected by the water level sensor to control the operation of the water feed pump.
The method of claim 3, wherein

Flash steam and condensate recovery apparatus further comprises an overflow valve installed on one side of the evaporation vessel to prevent overflow due to condensate flowing into the evaporation vessel.