SU1291785A2 - Boiler unit - Google Patents

Abstract

The invention relates to a power system, m. B, used to recover heat from the exhaust gases of metallurgical furnaces and is an improvement of the invention according to the authors. St. No. 1222978. The invention allows to increase the economy by reducing the time of conversion from water-J 1222978, cl. F 22 V 35/02, (L go) eo 1H J7 V

Description

one

Greyne on steam mode (P). When the unit (U) transitions into the water-heating system P, the steam exhaust pipe 7 is locked from below by the steam consumption controller 8 and from the top by the check valve 27 The medium movement in the bypass 28 is stopped, which serves as a signal from the sensor 29, the command to the valve actuator 26, which opens. At the same time, a part of the steam from the common highway and the steam tract constantly goes through the drainage line

291785

(DL) 25, maintaining the t-ru path within the specified limits. The heat released in the DL 25 steam is transferred to the heat exchangers 30 and 31 heated in the U and feed water. With the transition Y to the paragenerating or combined P through the bypass 28, the medium flows directly, which will be detected by the sensor 29. The latter will give a command to the actuator of the organ 26, and the DL will overlap. 1 hp f-l, I il.

The invention relates to a power system, can be used to recover heat from the exhaust gases of metallurgical and other furnaces, and is an improvement of the installation according to the basic model. St. No. 1222978.

The aim of the invention is to improve the economy by reducing the time of conversion from water-heating to steam operation.

The drawing shows a schematic diagram of the installation.

The boiler plant contains a cyclone separator 1 with water and steam volumes 2 and 3 connected

respectively through the standpipe and riser pipes 4 and 5 to the heating surface 6 heated by exhaust gases, a steam discharge pipe 7 with a steam flow regulator B connected to the water level sensor 9 in the separator 1, the standpipe 4 provided with an ejector 10 and a nozzle 11 connected to a feed pipe 12 provided with a feed regulator 13 connected to a steam pressure sensor 14 in separator 1. The upper part of the steam volume 3 of the separator 1 is connected to its vapor exhaust pipe 7 by a bypass line 15 equipped with a float regulator 16, troystvom 17 reverse current preventing vapor flow regulator 18. The cyclone separator 1 is equipped with a drain pipe 19, a purge line 20, a level control line 21

, water and safety valve

0

five

0

five

22, the standpipe pipe 4 is provided with a check valve 23, and the vapor pipe 7 is provided with a pressure regulator 24. The boiler plant also contains a drain line 25 with a shut-off element 26 connected to the lower part of the steam discharge pipe 7, and installed in the upper part of the latter a check valve 27 with a bypass 28 equipped with a medium flow sensor 29 connected to the shut-off member 26, and a drainage system The pipe 19 and the feed pipe 12 are equipped with heat exchangers 30 and 31, respectively, and the heating paths 32 and 33 are connected in series to the drainage line 25.

The installation works as follows.

Feed water through conduit 12 is supplied to standpipe pipe 4 through ejector to, thereby lowering the water temperature at the inlet to heating surface 6, and increasing the temperature difference between gases and water.

When the plant is operating in the steam-generating mode, the drainage pipe 19 of the separator 1 is closed. If the feed water flow rate exceeds the steam flow rate, the water level in the separator 1 rises, and the steam flow controller 8 connected to the water level sensor 9 decreases the steam flow, which leads to an increase in pressure in the separator 1. By a signal from the pressure sensor 14 steam in separator 1

31

feed controller 13 reduces feed water consumption.

With a sharp increase in the heat gap in the heating surface 6, the pressure in the separator 1 increases until the safety valve 22 triggers, resulting in the release of part of the water from the separator 1, a decrease in the water level in it and an increase in the steam flow regulator 8 through the steam exhaust pipe 7. Thereby, the pressure in the separator 1 is reduced, and the normal operation of the installation is restored.

When opening the drainage pipe 19 of the separator 1, the water level and pressure in the latter fall, which leads to an increase in the feedwater supply and the installation switches to a combined or hot-water operation mode,

If sufficient heat is supplied through the heating surface 6 to evaporate part of the water, the installation operates in a combined mode of generating steam and hot water.

If the amount of heat is not enough to form steam, then the separator 1 is filled with water all over, and the installation goes into a hot-water mode of operation, which makes it possible to more fully use the heat of gases,

With the transition to the hot-water mode of the plant, the water in the separator 1 fills its steam volume 3, the steam is steadily displaced into the steam discharge pipe 7 through the overflow line 15. The steam displacement continues until the float regulator 16 pops up and closes the access of water to the steam discharge pipe 7. When the installation is switched to steam or combined operation mode, the regulator 16 also provides with the help of the device 17 to prevent reverse flow, the steam from the steam discharge pipe 7 to the steam volume 3 of the separator 1 through the restart hydrochloric line 15. The flow regulator 18 on the line 15 creates an optimum mode selection .A displacement volume of steam from the steam 3 in the steam discharge pipe separator 1 - conductive tube 7 while translating installed on the hot water mode. This operation is performed during commissioning tests of the installation after installation.

Boiler installation due to the connection of the steam volume 3 of the separator 1 with the steam discharge pipe 7 to 854

The means of the bypass line 15, equipped with a float regulator 16, a device to prevent reverse steam flow and a regulator 18, allow switching from steam to combined and water-heating modes and back without a hydraulic shock in the separator, which increases the reliability of the installation as a whole.

When the boiler installation switches to the hot-water mode, the steam exhaust pipe 7 is locked from below by the steam flow controller 8 and from above by the check valve 27. Movement in the bypass 28 is stopped, which serves as a signal for the sensor 29 for the flow of the valve 26 installed on the drainage line 25, which opens at the same time, and a part of the steam from the common highway and the steam-removal duct continuously goes out through the drainage line 25, maintaining the temperature of the duct within the specified limits.

The heat entering the steam drain line 25 is transferred to heat exchangers 30 and 31 installed on the drainage pipe 19 and feed line 12, water heated in the installation and feed water,

With the transition of the boiler plant to the steam generating or combined mode through bypass 28, a direct flow of the medium occurs, which is detected by the sensor 29 of the flow path of the medium. The latter transmits the command to the actuator of the locking member 26, and the drainage line 25 automatically overlaps. Because . temperature is maintained in the vapor path; no delays in putting the plant into a steam generating mode occur. This increases the utilization rate of the plant and increases the heat utilization of the waste gases. metallurgical and other furnaces, and also reduces the cost of servicing heat recovery equipment.

Claims (1)

1. Boiler installation on the bus. EV, 1222978, characterized in that, in order to increase efficiency by reducing the time of 12917856 The transfer from water heater to pa-check valve is installed in the upper smooth operation, it is the extra-part last. but it contains a drainage line with constipation-2, Installation according to claim 1, a distinct body and a check valve with a booster so that water supply equipped with a flow sensor 5 water pipe and a feeding pipe of the medium connected with the locking member are supplied with heat exchangers, Moreover, the drainage line is connected to the heating paths of which, following the lower part of the steam discharge pipe, are connected to the drainage line.