CN1064148A

CN1064148A - Semi-opened steam condensed water recovering system

Info

Publication number: CN1064148A
Application number: CN 91108719
Authority: CN
Inventors: 栾东华
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-10
Filing date: 1991-09-10
Publication date: 1992-09-02
Anticipated expiration: 2006-09-10
Also published as: CN1024372C

Abstract

The present invention is new departure of condensed water recovering system in a kind of steam heating engineering, and by residual-heat exchanger, surplus vapour condenser, check exhaust, condensation tank, water tank overflow valve, valve member and connecting pipe connect and compose.Residual-heat exchanger is arranged on the front portion of condensation tank, and to surplus vapour and coagulate water and once cool off, surplus vapour condenser is arranged on the top of water tank, and the Shen surplus vapour that escapes is carried out the secondary cooling.Condensation tank communicates with atmosphere through surplus vapour condenser, and non-return structure is adopted in outlet.Native system is than the recyclable surplus vapour waste heat of open system, and the corrosion of minimizing system can be discharged on-condensible gas than closed system, reduces system's pressure of return water, improves operational reliability.

Description

Semi-opened steam condensed water recovering system

The present invention relates to a kind of Heat Supply Engineering, condensed water recovering system in specifically a kind of steam heating engineering.

In the actual steam heating system, when using steam, hot user to produce steam condensation water and indirect steam, string ease steam etc., and these are called for short backwater.Usually carrying a large amount of heat energy in the backwater, how with these heat energy with coagulate water and recycle better, is the problem that people are studying for a long time always.Existing steam condensed water recovering system has two big classes, and whether be criteria classification, be divided into open system and closed system if directly communicating with atmosphere with it.In " Heat Supply Engineering " (second edition), these two kinds of recovery systems have been done detailed argumentation by Harbin Archetectural Engineering College and the chief editor of University Of Tianjin.Open system is that the surplus vapour in the backwater is directly discharged, and only reclaims the saturated water that coagulates in the backwater.It has simple in structure, equipment is few, cost is low and use advantages such as easy to operate.But its heat energy and to coagulate the loss of water big, and the water that coagulates in the condensation tank directly communicates with atmosphere by the air hose on the condensation tank, absorbs airborne oxygen, equipment in the etching system and pipeline, and influence environment.Closed system be with coagulate water and indirect steam through some concentrate, operations such as voltage stabilizing, heat exchange, control, make the certain pressure of maintenance in the system, thereby indirect steam etc. recycled.Closed system has not lose coagulates water and heat energy, coagulate water and atmospheric isolation, and system's facility corrodes characteristics such as light.Owing to need to have the recycling that very high pressure (more than the 5000Pa) could be realized indirect steam in the system, therefore to have the device and components and parts of use many for closed system, the equipment complexity, control criterion requires high, the operational administrative difficulty is big, system reliability is relatively poor, and a series of unfavorable factors such as construction costs height bring very big inconvenience for the use of actual engineering.

In the manufacturing enterprise of reality, because of being limited to the requirement of production technology aspect, ubiquity the high and low pressure coexistence in its steam heating system, return pipe net unreasonable phenomenon such as connect together.When adopting the enclosed condensed water recovering system, the high pressure backwater raises water return pipeline pressure, and is bigger to the interference of low pressure backwater, very easily causes low pressure to coagulate the water backflow obstruction, makes low pressure not normal with hot equipment work.Also in the loopback way, want continuous secondary vaporizing on the other hand, thereby cause the carbonated drink two-phase movement, water attack very easily takes place, damage pipe fitting and equipment because of high pressure coagulates water.Above-mentioned unfavorable factor brings great obstacle for the enforcement of closed system, and people have to adopt open system under most occasion, and the surplus vapour emptying with in the backwater causes a large amount of wastes of the energy, and environment is also had a negative impact.

Purpose of the present invention just provides a kind of steam condensed water recovering system between open type and closed system, make its both had closed system coagulate water rate of recovery height, UTILIZATION OF VESIDUAL HEAT IN fully, advantage such as secluding air, also have the stable and reliable operation of open system, characteristic such as easy to operation.

Technical assignment of the present invention is achieved in that with residual-heat exchanger, surplus vapour condenser, check exhaust, condensation tank, water tank overflow valve and valve member and connecting pipe and connects and composes this steam condensed water recovering system.Concrete constituted mode is, coagulates water and enters between the water inlet that pipe is connected residual-heat exchanger and condensation tank, is connected the opening at condensation tank top communicating pipe and between the surplus vapour condenser on condensation tank top; The spout hole of water tank overflow valve and overflow pipe and condensation tank joins, and coagulates water discharge pipe and condensate pump and is serially connected on the delivery port of condensation tank; Check exhaust communicates with surplus vapour condenser by air hose.

The present invention also can connect a Safety water seal by shunt valve on the communicating pipe between condensation tank and the surplus vapour condenser.

Key problem in technology of the present invention is to adopt equipment such as residual-heat exchanger, surplus vapour condenser, check exhaust and condensation tank together to constitute a steam condensed water recovering system.Residual-heat exchanger is arranged on the front portion of condensation tank, and to surplus vapour and coagulate water and once cool off, surplus vapour condenser is arranged on the top of condensation tank, and the surplus vapour of string ease is carried out the secondary cooling.Condensation tank communicates with atmosphere through surplus vapour condenser, and non-return structure is adopted in outlet.This system has the systems stabilisation operating pressure, discharges on-condensible gas, stops air to invade, discharge multiple functions such as the interior excessive water with fixed attention of condensation tank.Residual-heat exchanger once cools off concentrating from the various pressure return waters (high and low pressure backwater) of return pipe net earlier, condensation, reduces pressure of return water, reclaims heat energy, condensed water etc.After backwater enters condensation tank, to the surplus vapour that is not condensed and on-condensible gas again through arriving surplus vapour condenser communicating pipe, carry out the secondary cooling condensation by surplus vapour condenser, but one side systems stabilisation pressure, pressure in the condensation tank is raise, on the other hand surplus vapour waste heat is carried out once " obstruction " again, reduce the ease vector.Check exhaust is discharged cooled on-condensible gas, and stops intrusion such as air.Reduce to below the saturation temperature through the coolant-temperature gage that coagulates behind the residual-heat exchanger, deposit condensation tank in.The synergy of residual-heat exchanger and surplus vapour condenser has guaranteed the steady of the interior vapour pressure of condensation tank.In view of operating mode complexity in the Heat Supply Engineering of reality, factor such as the fluctuation of surplus vapour amount is big utilizes Safety water seal can stabilize peak pressure, and excess steam is emitted.Safety water seal can guarantee that also condensation tank does not enter air in certain vacuum ranges.The excessive water inlet of condensation tank can be discharged by overflow valve.Water with fixed attention in the condensation tank can be delivered to thermal source by condensate pump.Recovery system of the present invention is compared with open system, can reclaim surplus vapour waste heat, the corrosion of minimizing system; Compare with closed system, can discharge on-condensible gas, minimizing equipment and control element quantity reduce system's pressure of return water, improve the security reliability of operation.Therefore directly communicate with atmosphere, but also be different from a kind of condensed water recovering system of closed system and atmospheric isolation between the condensation tank that between the two, not only is different from open system.

Below in conjunction with description of drawings embodiment.

Fig. 1 is a systematic schematic diagram of the present invention.

Fig. 2 is the section structure schematic diagram of residual-heat exchanger.

Fig. 3 is the structural representation of check exhaust.

As shown in Figure 1, coagulating water enters pipe 10 and is connected between the water inlet of residual-heat exchanger 1 and condensation tank 6.Promptly the high-low pressure backwater that comes out from hot user passes through residual-heat exchanger earlier, in interchanger, utilize normal temperature industrial water and steam backwater to carry out exchange heat, make with fixed attention that coolant-temperature gage drops to below the saturation temperature, and make the surplus vapour condensation of part, the backwater volume reduces, and the interior pressure of water return pipeline decreases.Backwater enters pipe 10 injection condensation tanks 6 by coagulating water after a heat exchange.For having prevented that a large amount of backwater from pouring in recovery system suddenly, at the residual-heat exchanger two ends and connect a shunt valve,, make excessive backwater in time inject condensation tank by valve control.Because surplus steam pressure in the return pipe net and vapour amount are extremely unstable, for guaranteeing that system works is normal, the vapour condenser 2 of having a surplus is set at the condensation tank top, be connected communicating pipe 8 between the opening and surplus vapour condenser 2 at condensation tank 6 tops, thereby the surplus vapour of string ease is carried out cooling condensation once more, make the condensation tank pressure stability.Water tank overflow valve 5 and overflow pipe 11 join with the spout hole of condensation tank 6, to discharge the excessive water that coagulates.Coagulate water discharge pipe 13 and condensate pump 14 and be serially connected on the delivery port of condensation tank 6, condensate pump is delivered to thermal source.For the hot user of co-generation unit, can be sent to steam power plant with coagulating water; For the hot user of boiler heat supplying, can deliver to the boiler room with coagulating water.Check exhaust 3 communicates with surplus vapour condenser 2 by air hose 7, thereby will discharge through twice cooled on-condensible gas and excessive surplus vapour, prevents that again air from entering simultaneously, realizes unidirectional conducting.Surplus vapour condenser 2 is connected by communicating pipe 9 with residual-heat exchanger 1, makes the normal temperature water that enters from surplus vapour condenser overhead inlet carry out the secondary heat exchange in the residual-heat exchanger through flowing into after the heat exchange surplus vapour condensation again.This connection is to be the conserve water resource, and the temperature of the heat exchange water that flows out from residual-heat exchanger is further improved, to improve its use value.After the cold water that is used for heat exchange is heated, can be directly used in and produces or life.Bottom at condensation tank 6 also is connected to water pipe 12, and with when keeping in repair condensation tank, water is coagulated in emptying.For preventing that excess steam from pouring in condensation tank and making its increased pressure, on communicating pipe 8, also be connected to Safety water seal 4 by shunt valve, with timely discharge excess steam or other gas, the pressure stability in the safeguards system and working properly.

The structure of residual-heat exchanger 1 (as shown in Figure 1 and Figure 2) is the tubulation arrangement form in housing 15.Walk backwater between pipe, walk cooling water in the tubulation 16, the tubulation in the interchanger is concentric-ring pattern to be arranged, and can reduce the vapour phase short circuit like this, reduces the vapour phase circulating resistance.Interchanger also can adopt other more existing versions.Reaching with fixed attention for the surplus vapour in the terminal pipe of return water system, water is vapour, liquid two-phase is moving.Residual-heat exchanger thermic load (being heat exchange amount) should be coagulated the contained total amount of heat of water by whole surplus vapour in the return pipe and part and be calculated.Average design pressure is 15KPa, and return water temperature is chosen by 100-105 ℃, and the average design flow velocity of vapour-liquid two-phase is about the 2-3 meter per second, and the interchanger internal diameter is determined according to this speed.Vapour and the ratio of the sectional area of liquid phase generally can be grasped at 3-4 than 1, increase the vapour phase circulation area as far as possible.Be to reduce resistance, make with fixed attention that coolant-temperature gage drops to below the saturation temperature, do not establish deflection plate between exchanger tube.

Surplus vapour condenser can adopt the version identical with residual-heat exchanger, is vertical structure when just installing, and surplus vapour is introduced from the bottom, and top run in feed channel and valve member etc. for improving heat transfer coefficient, can be provided with 1 to 2 layer of deflection plate between pipe.The cooling capacity of condenser should be determined total heat duties by the surplus steam flow amount that surpasses under the nominal situation state that may occur in the return pipe net system.The housing internal diameter is to design about 2 meter per seconds by surplus steam flow speed, and discharge the self cooling condenser of surplus vapour condensate liquid bottom, through the pipeline reflow tank.Cooling water temperature rise is got △ t=3-6 ℃.

The check exhaust opening pressure can be designed to 5KPa, and has non-return function, and primary structure is made up of valve block 19, valve body 17, valve port 18 and protective cover 20 as shown in Figure 3.Valve port 18 is fixed in the suitable for reading of valve body 17, and valve block 19 covers on valve port, and is fixed together by rotating shaft 21 and valve body.When internal gas pressure during greater than opening pressure, gas is valve block jack-up, and overflows, and when treating that internal pressure drops to less than opening pressure, valve block automatically resets, and seals valve port.For valve block can be resetted rapidly freely, with the inclination form of making suitable for reading of valve body 17, rotating shaft 21 is located on the peak.Valve block adopts stainless sheet steel, and valve port can be with materials such as heat resistant rubber or polytetrafluoroethylene (PTFE), nylon.For preventing the motion of extraneous factor interference valve block, on valve body, fix a cartridge type protective cover 20.Protective cover is positioned on the valve body by screw.

Condensation tank, Safety water seal, overflow valve, condensate pump and other assemblies all adopt known prior art version to get final product.

The form that condensed water recovering system of the present invention adopts two-stage heat exchanger to cooperate with condensation tank consists of, and system pressure is lower, and the high-low pressure backwater in the pipe network is had compatibility, and is simple in structure, the reliability height. The characteristics that have are: 1, native system can assurance system's end be in minute-pressure (state of p≤5KPa), thus make whole return pipe net system pressure lower. This water return system using steam In-particular for high and low backwater coexistence is necessary. It can reduce or eliminate the high pressure backwater to the interference of low pressure backwater, makes the low-voltage equipment backwater unobstructed, and the thermal efficiency improves. Simultaneously native system also has the function of the solidifying or pernicious gas of discharging, and easy for operation, management work Few, construction costs is low, so have the advantage of open system. 2, native system can reclaim a large amount of surplus vapour in the return pipe net effectively, and steam leakage is few, has increased solidifying water yield, take full advantage of the waste heat of backwater, reduce the production of steam cost, can also stop the air invasive system simultaneously, improve solidifying water quality, the corrosion of minimizing system. So also have the advantage of closed system. But 3, the residual heat and steam of the multiple grade of native system centralized recovery steam heating return water system (high-low pressure backwater) and flow, and can reclaim selectively part sensible heat in the saturated solidifying water (such as temperature at the solidifying contained sensible heat of water of 80-100 ℃ of scope), be convenient to control and regulation, need not increase personnel and surcharge. 4, because of pressure of return water and temperature reduction, a large amount of heat energy are taken out of condensation tank, thereby the duty condition of condensation tank and condensate pump is improved, and pump efficiency improves, and operation and maintenance cost reduce. 5, native system can be eliminated in atmosphere and discharge the used heat phenomenon, has reduced the pollution to environment.

Claims

1, a kind of semi-opened steam condensed water recovering system, it is characterized in that this system is by residual-heat exchanger 1, surplus vapour condenser 2, check exhaust 3, condensation tank 6, water tank overflow valve 5 and valve member and connecting pipe connect and compose, coagulating water enters pipe 10 and is connected between the water inlet of residual-heat exchanger 1 and condensation tank 6, be connected the opening at condensation tank 6 tops communicating pipe 8 and between the surplus vapour condenser 2 on condensation tank top, water tank overflow valve 5 and overflow pipe 11 join with the spout hole of condensation tank 6, coagulate water discharge pipe 13 and condensate pump 14 and be serially connected on the delivery port of condensation tank 6, check exhaust 3 communicates with surplus vapour condenser 2 by air hose 7.

2, condensed water recovering system according to claim 1 is characterized in that being connected with Safety water seal 4 by shunt valve on communicating pipe 8.

3, condensed water recovering system according to claim 1 and 2 is characterized in that residual-heat exchanger 1 is formed by the tubulation 16 that the concentric-ring pattern arrangement is set in cylindrical shell 15.

4, condensed water recovering system according to claim 1 and 2, it is characterized in that check exhaust 3 is made of valve body 17, valve port 18, valve block 19 and protective cover 20, valve port 18 is fixed in the suitable for reading of valve body 17, and valve block 19 covers on valve port, and is fixed together by rotating shaft 21 and valve body.