CN101487604B

CN101487604B - Closed circulating phase-change heat distribution system of industrial boiler

Info

Publication number: CN101487604B
Application number: CN200810169305XA
Authority: CN
Inventors: 刘绍允; 郝进录; 宋贵生
Original assignee: SHAANXI QIAOSHANGQIAO BOILER CONTAINER MANUFACTURE CO Ltd
Current assignee: Shaanxi Qiaoshangqiao Boiler Container Manufacturing Co ltd
Priority date: 2008-01-18
Filing date: 2008-10-08
Publication date: 2012-05-30
Anticipated expiration: 2028-10-08
Also published as: CN101487604A

Abstract

The invention relates to an industrial boiler closed cycle phase transition heating system. A steam transmission hole of a boiler is communicated with a steam inlet of a gas-distributing cylinder by a main steam pipe, a steam outlet of the gas-distributing cylinder is sequentially communicated with heating equipment and a steam inlet of a secondary steam boiler by a steam main and steam branch pipe, the downstream of the steam main is provided with a standby pipeline, the pipeline of the main steam pipe is provided with a branch communicated with a water storage tank, water charging tanks are connected with the heating equipment and the lower part of the secondary steam boiler, the water charging tanks are connected with a two-phase flow main pipe by an overflow pipe, a liquid outlet of the two-phase flow main pipe is communicated with a liquid inlet of a low-level liquid collecting tank, a liquid outlet of the low-level liquid collecting tank is communicated with the water storage tank by a high-temperature pump, and a water outlet of the water storage tank is communicated with a water inlet of the boiler by the high-temperature pump. When in running, the system can effectively preventing the outside air from permeating and the system equipment from being corroded by the gas. As phase transition heating circulation is carried out in the closed system by the steam generated by the boiler, the whole high temperature condensed water can be recovered, and the heat energy utilization rate of the system can be improved.

Description

Closed circulating phase-change heat distribution system of industrial boiler

Technical field

Content of the present invention belongs to the Heat Supply Engineering equipment technical field, relates to a kind of closed circulating phase-change heat distribution system of industrial boiler.

Background technology

Mostly present known Industrial Boiler phase-change heat distribution system is open system, and steam is accomplished to become after the heat exchange in system and is condensed water, and the indirect steam after most of condensed water and the step-down all can not be recycled by system effectively.Though this area is also developed the heating system that some are equipped with condensate water recovery device in succession in recent years; But because it can not be fully and isolated from atmosphere; Also have oxygen corrosion in the system, therefore condensed water can not be caused the waste of system's heat energy and being corroded of equipment by whole recovery.In addition, the hot equipment of usefulness in existing most of system also all must be adorned drain valve, because the drain valve failure phenomenon is commonplace in system's running; Normal operation-the system that has influenced equipment is in service, because the keying of equipment, temperature and pressure decline produces negative pressure when shutting down; Gap invasive system internal corrosion system and equipment that extraneous air is existed by pipeline, pump raft; Also influence is conducted heat, and therefore, prevailing system also must dispose water treatment facilities such as oxygen-eliminating device and Na-ion exchanger.

Summary of the invention

The objective of the invention is to the problem that prior art exists is solved, a kind of reasonable in design, dependable performance is provided, can the heat content of condensate in the heating system be all reclaimed and avoid in the outside air entering system causes system equipment by the closed circulating phase-change heat distribution system of industrial boiler of corrosion such as oxygen and carbon dioxide.

For realizing that the technical solution that the foregoing invention purpose adopts is: the closed circulating phase-change heat distribution system of industrial boiler that is provided contains that boiler, water tank, gas-distributing cylinder, high-temperature pump, the hot equipment of a plurality of usefulness, the low level liquid collecting jar that water level controller is housed, indirect steam boiler, main steam header, steam are done, many steam branch pipes and connecting line; In system's syndeton; The boiler gas transferring port is communicated with through main steam header and gas-distributing cylinder air intake; The gas-distributing cylinder venthole is communicated with the steam main air intake; Steam main is communicated with each steam branch pipe, and each steam branch pipe venthole is communicated with the air intake of hot equipment of corresponding usefulness and indirect steam boiler respectively; The top air intake of low level liquid collecting jar is communicated with through an arm low-voltage tube and steam main; In the downstream of steam main the standby pipeline is housed; On the pipeline of main steam header, be arranged with one and be connected to the visible cross over pipe of water tank vapour; All be connected with the water-filling jar with hot equipment and indirect steam boiler bottom; Each water-filling jar is connected with the two phase flow main by overflow pipe separately; The liquid outlet of two phase flow main passes to the inlet of low level liquid collecting jar; The liquid outlet of low level liquid collecting jar bottom is connected with the inlet of water tank through high-temperature pump, and the delivery port of water tank bottom passes to the water inlet of boiler through high-temperature pump.

In system according to the invention real work; The steam of being supplied with by boiler is after steam main is transported to hot equipment; Become high-temperature condensation water and flow automatically to low level liquid collecting jar through heat exchange, deliver to the water tank of boiler again by high-temperature pump, and then deliver to boiler through high-temperature pump again and repeat heating by difference in height; Working medium (water) is carried out the phase transformation circulation with the form of vapour-liquid-vapour in the system of sealing like this, for each heating equipment is supplied with heat.In the system architecture of the present invention; Provided upstream at steam main has the standby pipeline, closes when stopping heat supply when main, and the standby pipeline will charge into down-stream system through post-decompression low-pressure steam; Make system be kept above atmospheric barotropic state, stop in the outside air infiltration system; At the part that is communicated with main or separate unit during with hot equipment out of use; When descending the negative pressure that appears along with temperature and pressure with hot equipment; Back pressure in the low level liquid collecting jar will be gone into the effect of playing valve in the headroom with hot equipment with the hydraulic pressure in the water-filling jar that is connected with hot equipment, also stop in the outside air infiltration equipment, and the oxygen and carbon dioxide material that has effectively prevented various approach through above-mentioned measure is to corrosion on Equipment; Get rid of incondensable gas in the system, improved the heat exchange performance of steam.In addition, linked by cross over pipe between the Boiler Steam person in charge and the water tank, make boiler and water tank pressure keep balance, the water of water tank is transported to boiler by high-temperature pump, and the work of high-temperature pump is controlled by the water level controller on the boiler body.Outside the factor that parts such as valve, pump, pipeline run, emit, leak in removal system like this; System must moisturizing; Can practice thrift great lot of water resources; Again because do not mend unboiled water, system has also just stopped because of advancing in the air that unboiled water brings into oxygen and carbon dioxide to corrosion on Equipment, so can establish oxygen-eliminating device and sodium ion exchanged water treatment facility in the system again.

Compared with prior art; The beneficial effect that the present invention has is: working medium (water) circulates various in the system of complete closed with the phase deformation states of vapour-liquid-vapour; Avoided the loss of condensed water, condensed water can be recycled by whole recovery, has improved the thermal efficiency of heating system to greatest extent; During the system hot device shutdown of usefulness in main or arm in service; System remains barotropic state; Stoped effectively because of outside air and infiltrated the corrosion of oxygen and carbon dioxide that system causes system equipment; And avoided system to produce the problem that incondensable gas influences heat exchange, improved operating efficiency with hot equipment.Owing to the water-filling jar is housed, need not refill valve and drain valve in addition, simplify the structure, reduce cost with hot equipment with hot equipment; Except that above-mentioned advantage, the low level liquid collecting jar that in system, is provided with also has decontamination function, and water tank has scrubbing, the degassing purifies and the function of moisturizing.

Description of drawings

Fig. 1 is the basic principle schematic of an embodiment of heating system according to the invention.

Fig. 2 is the sketch map of standby pipeline portions among Fig. 1.

Fig. 3 is the structural representation with hot filling apparatus water pot.

Fig. 4 is the structural representation of the hot filling apparatus water pot of split type usefulness.

Each label title is respectively among the figure: 1-low level liquid collecting jar, 2-water level controller, 3-high-temperature pump, 4-two phase flow main, 5-water-filling jar, 6-overflow pipe; 7-uses hot equipment, 8-steam branch pipe, 9-low-voltage tube, 10-water tank, 11-high-temperature pump, 12-boiler; The 13-cross over pipe, 14 main steam header, 15-gas-distributing cylinder, 16-standby pipeline, 17-steam main, 18-indirect steam boiler; The 19-secondary steam pipe, 20-bypass pipe, 21-magnetic valve, 22-pressure-reducing valve, 23-magnetic valve; The 24-tedge, 25-steam inlet pipe, 26-air space, 27-valve, 28-exhaust steam valve.Heavy line is represented steam pipe in the accompanying drawing; Fine line is represented control circuit; The short line segment dotted line is represented the two phase flow pipe; Long line segment dotted line is represented condensate pipe.

The specific embodiment

Below will combine accompanying drawing that content of the present invention is further specified, but practical application form of the present invention is not limited in illustrated embodiment.

Referring to accompanying drawing, closed circulating phase-change heat distribution system of industrial boiler of the present invention is by boiler 12, water tank 10, gas-distributing cylinder 15, high-temperature pump 3,11, form with hot equipment 7, low level liquid collecting jar 1, indirect steam boiler 18, main steam header 14, steam main 17, steam branch pipe 8 and corresponding valve and connecting line etc.Boiler 12 passes to water tank 10 and gas-distributing cylinder 15 respectively through main steam header 14; The steam main 17 that is connected with the venthole of gas-distributing cylinder 15 is equipped with standby pipeline 16; The steam branch pipe 8 in standby pipeline 16 downstream is connected with each air intake with hot equipment 7 and indirect steam boiler 18, and wherein an arm low-voltage tube 9 is communicated with low level liquid collecting jar 1 top.Bottom with hot equipment 7 and indirect steam boiler 18 all is connected with water-filling jar 5, can adopt monolithic construction with hot equipment 7 with water-filling jar 5, also can adopt split-type structural as shown in Figure 4.Water-filling jar 5 is connected with two phase flow main 4 by overflow pipe 6 separately; Two phase flow main 4 is connected the top of low level liquid collecting jar 1, and low level liquid collecting jar 1 is equipped with water level controller 2, is connected with high-temperature pump by control circuit; The water inlet pipe of high-temperature pump 3 is contained in the bottom of low level liquid collecting jar 1; The top of outlet pipe and water tank 10 is communicated with, and the water inlet pipe of high-temperature pump 11 and water tank 10 bottoms are communicated with, and the inlet of outlet pipe and boiler 12 is communicated with.Be connected with control circuit between the steam chest of boiler 12 upper drums.Main steam header 14 is connected through cross over pipe 13 and water tank 10 air spaces, makes the pressure balance of boiler 12 and water tank 10.The indirect steam boiler 18 that is provided with in the system can provide steam to the hot equipment of the usefulness of steam direct heat transfer.The system architecture of this set embodiment is relatively simple.

Standby pipeline 16 among the present invention is contained in the downstream of steam main 17; Its structure is as shown in Figure 2; Steam main section and the bypass pipe 20 parallelly connected with the steam main section by being series on the steam main 17 are formed; Steam main section at standby pipeline 16 is equipped with magnetic valve 21, and pressure-reducing valve 22 and magnetic valve are housed on bypass pipe 20.System is in service, when closing magnetic valve 21, opens magnetic valve 23 post-decompression low-pressure steams and charges into all devices and pipeline on the steam main 17, in the blocking-up outside air infiltration system, makes equipment of this part and pipeline be in holding state.

In Fig. 1 and system architecture shown in Figure 3; Any inner air space 26 temperature and pressures when shutting down with hot equipment 7 descend; Receive the effect of low level liquid collecting jar 1 back pressure to be pressed into air space 26 to the water of water-filling jar 5 through 24 of tedges, reach the water seal effect with hot equipment 7.10 of water tanks are by cross over pipe 13 delivering vapors, prevent that high-temperature pump 11 from crossing the low cavitation that produces because of back pressure, safeguard high-temperature pump 11 operate as normal.On steam supply pipe, adorn valve with 7 of hot equipment, then needn't adorn valve on the water pipe with fixed attention.When closing, should open the valve 27 on the gland steam exhauster, make exhaust steam valve 28 in running order with the steam inlet pipe 25 of hot equipment 7.

In system, overflow pipe 6, two phase flow main 4 are the operation of two phase flow state, and the forward and backward pipeline that is connected with high-temperature pump 3,11 is liquid full packages operation.

The low level liquid collecting jar 1 that is provided with in the system also has decontamination function, and water tank 10 has scrubbing, the degassing purifies and the function of moisturizing.

Claims

1. closed circulating phase-change heat distribution system of industrial boiler; Contain boiler (12), water tank (10), gas-distributing cylinder (15), high-temperature pump (3,11), the hot equipment of a plurality of usefulness (7), the low level liquid collecting jar (1) that water level controller (2) is housed, indirect steam boiler (18), main steam header (14), steam main (17), many steam branch pipes (8) and connecting line; It is characterized in that: boiler (12) gas transferring port is communicated with through main steam header (14) and gas-distributing cylinder (15) air intake; Gas-distributing cylinder (15) venthole is communicated with steam main (17) air intake; Steam main (17) is communicated with each steam branch pipe (8), and each steam branch pipe (8) venthole is communicated with the air intake of hot equipment of corresponding usefulness (7) and indirect steam boiler (18) respectively; The top air intake of low level liquid collecting jar (1) is communicated with through an arm low-voltage tube (9) and steam main (17); In the downstream of steam main (17) standby pipeline (16) is housed; On the pipeline of main steam header (14), be arranged with a cross over pipe (13) that is connected to water tank (10) air space; All be connected with water-filling jar (5) with hot equipment (7) and indirect steam boiler (18) bottom; Each water-filling jar (5) is connected with two phase flow main (4) by overflow pipe (6) separately; The liquid outlet of two phase flow main (4) passes to the inlet of low level liquid collecting jar (1); The liquid outlet of low level liquid collecting jar (1) bottom is connected with the inlet of water tank (10) through high-temperature pump (3), and the delivery port of water tank (10) bottom passes to the water inlet of boiler (12) through high-temperature pump (11).

2. closed circulating phase-change heat distribution system of industrial boiler according to claim 1; It is characterized in that: standby pipeline (16) is made up of the steam main section and the bypass pipe (20) parallelly connected with the steam main section that are series on the steam main (17); Steam main section at standby pipeline (16) is equipped with magnetic valve (21), and pressure-reducing valve (22) and magnetic valve (23) are housed on bypass pipe (20).

3. closed circulating phase-change heat distribution system of industrial boiler according to claim 1; It is characterized in that: overflow pipe in the system (6), two phase flow main (4) are the operation of two phase flow state, and the forward and backward pipeline that is connected with high-temperature pump (3,11) is liquid full packages operation.

4. closed circulating phase-change heat distribution system of industrial boiler according to claim 1 is characterized in that: the indirect steam boiler (18) through being provided with in the system provides steam to the hot equipment of the usefulness of steam direct heat transfer.

5. closed circulating phase-change heat distribution system of industrial boiler according to claim 1 is characterized in that: hot equipment of the usefulness in the system (7) and water-filling jar (5) are monolithic construction or split-type structural.