JPH1137408A - Vacuum steam boiler that promotes the generation of vacuum steam by performing decompression operation even when there is no load - Google Patents

Abstract

(57) [Summary] [Purpose] An operation amount transfer vacuum composed of an ejector and a high-pressure pump by condensing steam from the can body steam chamber at the start of operation and wet gas in the can body steam chamber with a condenser. The purpose of the present invention is to suction by a pump or a water ring type vacuum pump, to quickly reduce the pressure in the steam chamber of the can body, and to condense water to generate vacuum steam while improving the boiler efficiency. [Structure] Can steam chamber (19), solenoid valve (34), condenser (27), vacuum steam circuit (3
5) Ejector (25), high-pressure pump (26), drain tank (23), boiler makeup water pipe (22), vacuum boiler can body water chamber (15).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to all industrial fields using steam.

[0002]

2. Description of the Related Art A vacuum boiler conventionally used is provided with a bleed solenoid valve, a three-way solenoid valve, and a bleed pump in an exhaust pipe of a boiler can body as shown in the reference diagram on the next page, and automatically bleeds to reduce the pressure. When steam was generated and the pressure increased, one of the three-way solenoid valves was opened and the method of discharging was used, which had a problem. The reference diagram on the next page shows the operation principle diagram shown in the catalog of the company S which is commercially available and the connection diagram of this boiler. According to this boiler connection diagram, the gas and water vapor discharged by the extraction pump are released into the atmosphere, and it is not possible to reduce the pressure to a high vacuum. Also, since the degree of pressure reduction often fluctuates, stable vacuum vapor is not generated. The prior art was like this.

[0003]

The wet gas and water vapor sucked from the steam chamber of the can by the bleeding pump are exhausted to the outside of the can, but a large amount of the reduced pressure steam generated at the same time is discarded, and the boiler efficiency is lowered. In addition, since the pressure of the bleeding pump is reduced while being automatically controlled, the degree of reduced pressure varies. The problem to be solved by the invention lies here.

[0004]

According to the present invention, a solenoid valve of (34) and a condenser of (27) are provided after the steam discharge pipe (6) in the gas vapor chamber of (19), and the cooling water (28) is provided. The vacuum vapor which has been cooled and condensed and drained after passing through the vacuum vapor circuit at the time of no-load operation of (35) is evacuated by a momentum transfer type vacuum pump composed of an ejector and a high pressure pump. The drain passes through the drain tank of (23) (1
5) Condensate water is maintained in the vacuum boiler can body water chamber while maintaining the residual heat. Also, the gas vapor chamber can be kept depressurized.

[0005]

[Operation and Effect] By draining the wet gas and water vapor in the can body steam chamber with a condenser and suctioning it with a momentum transfer type vacuum pump, the can steam chamber itself of the vacuum boiler is also depressurized, and the generated steam is decompressed. Easy to do 99-10
It becomes vacuum steam of ° C. 80-30 ℃ steam is used for food machinery
Widely used for air conditioners, chemical machines, brewing machines, etc. also,
The operating temperature range of this vacuum boiler is usually in the range of 99 to 10 ° C., but the normal temperature operation can also be performed, so that the operating temperature range of the normal pressure boiler which is generally used can be cleared. It is believed that the present invention has a great effect and effect on the industry.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a vacuum boiler for condensing steam generated at the time of pressure reduction by a condenser and condensing water.

[Invention of sign]

 DESCRIPTION OF SYMBOLS 1 Solid fuel 2 Bunker 3 Shooter 4 Fine solid fuel 5 Blower 6 Steam discharge pipe 7 Primary steam and fine solid fuel mixture 8 Secondary air inlet 9 Oil supply pipe 10 Oil injection pipe 11 Oil pump 12 Stop valve 13 Strainer 14 Oil tank 15 Vacuum boiler can body water chamber 16 Vacuum boiler can body 17 Swirler 18 Boiler water level 19 Can body steam chamber 20 Chimney 21 Flue 22 Boiler makeup water pipe 23 Drain tank 24 Overflow pipe 25 Ejector 26 High pressure pump 27 Condenser 28 Cooling water pipe 29 Check valve 30 Compressor 31 Air valve 32 Low temperature steam regulating valve 33 Electric valve 34 Solenoid valve 35 Vacuum steam circuit at no load operation 36 Vacuum steam feed tube at load operation 37 Vacuum steam feed tube combined with low temperature decompression steam valve 38 Radiator 39At the factory operation vacuum vapor return line 40 an ejector suction pipe 41 ejector discharge pipe 42 expansion tank 43 trap valve 44 makeup water 45 ejector suction port

Claims (3)

[Claims] 1. A steam discharge pipe (6) of a vacuum boiler can (16), a condenser (27) of a vacuum steam circuit (35) during no-load operation, an ejector (25), a high-pressure pump (2).
The drain condensed by the condenser (27) is transferred to the drain tank (23) through the momentum transfer type vacuum pump constituted in 6), and the pressure in the can vapor chamber (19) is reduced to start up the vacuum vapor. Inspiring vacuum boiler. 2. When the vacuum steam is generated, immediately (34)
Close the solenoid valve of (33), open the motorized valve of (33), and (36)
At the time of load operation, vacuum steam is sent to the radiator of (38) by the vacuum steam feed pipe, and the stop valve of (12) and the stop valve of (39)
The vacuum steam drain is collected in the drain tank of (23) using a momentum transfer type vacuum pump composed of the ejector of (25) and the high pressure pump of (26) through the vacuum steam return pipe during the load operation of A vacuum boiler that generates vacuum steam while sending pressure to the vacuum boiler can body water chamber of (15) through the boiler makeup water pipe of (22). 3. A vacuum boiler which can further reduce the vacuum steam discharged from the canister steam chamber of (19) to a higher vacuum by using the low-temperature pressure reducing valve of (32).