Izinqubo zokusetshenziswa kwesivuli se-flange gate valve ekulawuleni kwesistimu sokuphefumula

Izinkinga zokusetshenziswa kwesivinini se-flange gate valve ekulawuleni kwesistimu sokuqala sokuphefumula.

Hydraulic misalignment is one of the factors affecting the quality of heat supply. Heating system operation, due to hydraulic disorders caused by the distance from the heat source or floor above and below the different users appear overcooling or overheating and other anomalies, the use of balancing valves to regulate, to achieve the design of the hydraulic condition, to ensure the stability of the heating system.

0 Introduction - 0 Ukubonisa

Ukungaphandle kwezokwelapha kwamandla kuyinto eyenzayo ukuthi ububanzi bokukhokha kwamanzi kwenziwe kube yinto esikhundleni sokuphefumula. Ngenxa yezemvelo yomhlaba ekhomba ukuncintisana kwamanzi kanye nokulondoloza, ukuphefumula okwamanzi okwamanzi ekhaya kwezindawo zasekhaya kwenza kube yisikhathi kanye nesikhathi. Ngo iminyaka eminingi, ukwakhiwa kwesakhiwo sekhaya, isakhiwo sekhaya sisebenza kakhulu, kufikisa ekwakheni kwamanzi amaningi, okufika ekwakheni kwamanzi amaningi akwenzeki. Kodwa futhi, kuyinto eyenzayo ukuthi kwenzeke izifo zokwelapha kwenziwe kube yisikhathi esiningi. Kusukela ekwakhiweni kwesakhiwo sekhaya sokuphefumula esikhethekile, ububanzi bokukhokha kwamanzi kwenziwe kube yisikhathi esiningi, okuyinto eyenzayo ukuthi ukuphefumula okwamanzi kwenziwe kube yisikhathi esiningi kwenza kube yisikhathi esiningi. Kusukela ekwakhiweni kwesakhiwo sekhaya sokuphefumula esikhethekile, ububanzi bokukhokha kwamanzi kwenziwe kube yisikhathi esiningi, okuyinto eyenzayo ukuthi ukuphefumula okwamanzi kwenziwe kube yisikhathi esiningi kwenza kube yisikhathi esiningi.

1. Izinga lokusebenza kwesistimu yokugcina.

Hydraulic conditions refers to the system pipe network pressure, flow and differential pressure. Hydraulic balance is manifested in the reasonable distribution of the user flow. Heat supply pipe network, water is the heat carrier medium, the reasonable distribution of flow is the basis of the balance of thermal conditions. Calculation of hydraulic working conditions is the system design of the user flow in the theoretical condition determined by the pipe and the maximum flow rate limitations, resulting in the system pipeline characteristic resistance number of ratio and design requirements of the pipeline characteristic resistance number of ratio is not consistent, which is inherent in the system itself. Heating system is a complex hydraulic system, the hydraulic conditions between the loops affect each other and constrain each other. In operation, any one of the user's flow changes will cause the other user's flow with the changes that occur in the system, the user's flow will be redistributed, so that the user's actual flow and calculation of the flow is not consistent, resulting in hydraulic disorders, resulting in the phenomenon of hot and cold uneven. The hydraulic condition of the heating system is formed by the intersection of the output pressure working curve of the pump and the characteristic curve of the external network. The water pressure diagram of the heating system is a theoretical representation of the external network pressure conditions for safe and reliable operation of the system and determination of the optimal operating point. Heating system into operation, due to the circulating water pump characteristic curve is relatively gentle, the total pressure drop of the change is very small, and the characteristic curve of the external network must be, so the operation of the hydraulic condition of the adjustment process is essentially based on the system pressure diagram, in accordance with the calculation of the user's flow rate of the distribution of heat media adjustment process. That is, set up hydraulic balancing equipment, to overcome the excess capital pressure head at the near end of the heating system, increase the resistance at the near end, to realize the operation of the system water pressure diagram and hydraulic working condition design of the formation of the water pressure diagram tends to be close to the process. In this way, achieved with the design requirements of the pipeline characteristics of the resistance number of ratio of the same value, the system running flow and design of the total flow of the same, the end user flow to achieve the calculation of the flow rate, the distribution of uniform and reasonable, the realization of the hydraulic balance of the heating system to achieve the safe and reliable operation, hydraulic stability and heating quality purposes.

2 heating system hydraulic disorder analysis

Heating system hydraulic disorder is a common problem. The main reasons exist in: one. The design of the heating network hydraulic calculation is not accurate, only note the most unfavorable point (usually at the end of the system) necessary to use the head, and other points of the head is always greater than the calculated value, the closer to the location of the heat source of the head of the position of the head of the head of the head of the head of the head of the head of the head of the head of the head. And the loop itself does not have the independent hydraulic adjustment function, there is bound to be a flow distribution deviation from the design state, resulting in the user hot and cold uneven hydraulic disorders (usually near the end of the overheating, the far end is not hot). Secondly, in the case of reasonable system design, the pump selection is too large, the operation of the flow deviates from the design state (large flow small temperature difference), also leading to the system's hydraulic disorders. Third, the increase in the number of new users and the expansion of the heating network, but not in time to transform the calibration, but only to replace the pump (increase the flow and head of the pump) to make the system more complex operation and management, resulting in new hydraulic disorders. Usually set up a large flow, high head pumps, using a large flow of small temperature difference in this way and can not solve the hydraulic imbalance phenomenon. According to relevant information, large flow small temperature difference in the operation of the system will increase the investment of more than 20%, consume 15% -20% of the thermal energy, more than 30% of the power consumption.

3 i-valve yokulungiswa kwesistimu sokupheka yokulawula yomoya ku isiZulu

Kwesokudala kwezindaba yomlomo wemupayipi ukufaka isikhuba esikhubekayo noma ukufaka izitayela zokufaka, izitayela zokufaka, noma okunqamulezayo, ukulawula isisindo somkhumbi wokuphatha, ukuthuthukisa isisindo sokuphatha, ukubonisa isisindo sokuphatha esikhishwe kusistimu somsebenzi. Kodwa, isibonelo kuyilokhu isikhuba sesikhubekayo sikhululwa ngokwesibonelo, uma isisindo somphumela sokuphatha sikh

Njengoba, izivalo zegeti, izivalo zeglobu zinamandla okubi ekwenza isici esiphambili, kufanele kube ngokwanele njengoba isivalo.

Especially after the implementation of household measurement measures, if any user system valve opening changes, due to throttle orifice plate and other fixed flow rate of its regulation, will be redistributed to the flow rate of new water disorders generated after the phenomenon, the need to recalculate the adjustment, action lag, operational complexity, poor flexibility.

Kwesokudala kwezindaba zokubeka isiphetho sezindiza zomlomo kwiqembu lokufaka izinkampani zokuphatha, izinkampani zokuphatha ezisebenzayo kwezinkinga zomlomo kanye nezinkampani zokuphatha zezinkinga zomlomo, njll, ukwenzela kwakhe okuphakathi, ukwakhelwa okuphakathi nokwakhelwa okuphakathi. Ukusebenza kwakwamanye amazwe eminyakeni edlule, kwenza okuhle. Izinkampani zokuphatha, izinkampani zokuphatha ezisebenzayo kwezinkinga zomlomo kanye nezinkampani zokuphatha zezinkinga zomlomo zingaba kwiqembu lokuphatha. Isakhiwo esikhulu lesakhiwo lesithathu kulezi zinhlelo zokuphatha kuyisakhiwo somlomo, isigqoko sokuphatha kuyisisekelo sokushintsha isiphetho sokuphatha ukuze kushintshwe isikhala sokuphatha nokuphatha, ukuze kwenzeke ukuphatha okuphatha ngaphansi kwevali, kushintshwe isikhala sokuphatha ngaphansi kwevali, ngaphandle kokuphathwa kwesitshalo esikhishwe, kwenza kube lula ukwenza ukuphakama kwesistimu ukuze kufikelekele ukuphakama kwesistimu. Isivalo sivuliwe ekuphatheni, ukusebenza kwesivalo sakhe akushintshisi ngesikhathi sokuphatha; isinkampani esisebenzayo yezinkinga zomlomo isetshenziswa ekuphatheni kwesikhala sokuphatha, ukusebenza kwesivalo sakhe kushintsha ngokwesokudla, kanye nokushintsha okuphatha, ukuze isikhala sokuphatha sikwazi ukulungisa okuphatha ngokuphatha. Kuqala ukuphatha okuphatha kwezinkinga zomlomo kwiqembu lokuphatha, ukusebenza kwesivalo sakhe kushintsha ngokwesokudla ngesikhathi sokuphatha kanye nokushintsha okuphatha, ukuze isikhala sokuphatha sikwazi ukulungisa okuphatha ngokuphatha. Ngokuphatha kwesivalo sakhe kwezinkinga zomlomo kwiqembu lokuphatha, ukusebenza kwesivalo sakhe kushintsha ngokwesokudla ngesikhathi sokuphatha kanye nokushintsha okuphatha, kungakwenza okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha okuphatha ok

3.3 Heating system operation regulation, the centralized regulation of the system flow does not change, because the system flow does not change, the differential pressure of the pipe network will not change, and thus the balance valve, self-operated flow control valve, self-operated differential pressure control valve openings do not change the distribution of the flow of the network also does not change, so can be selected. But to choose the flow control valve or balance valve first, such as the amount of regulation should be used to balance the valve. For the user to change the flow of autonomous regulation, because of its indoor system more than a common riser of the two-pipe system. Therefore, if the common riser inlet balancing valve, relying on the user temperature control valve multiple actions, can achieve different users of the room temperature requirements, and thus the balance valve can be selected. If the common riser inlet installed self-operated differential pressure control valve, can make the common riser differential pressure to remain unchanged, is conducive to the temperature control valve to control the flow of radiator regulation, so the selection of self-operated differential pressure control valve has the best results. As the user's independent adjustment, the pipe network flow is also changed, so the pipe network branches are also suitable for the installation of self-operated differential pressure control valve.

1. I-applications yokuhamba kwezinyawo zokugcina 2. I-applications yokuhamba kwesayizi 3. I-applications yokuhamba kwesayizi yokuhamba 4. I-applications yokuhamba kwesayizi yokuhamba ngezindlela ezinkulu

A unit of heating system renovation process installed balance valve, after several heating season operation results show that the installation of the balance valve can be a good solution to the system's hydraulic imbalance phenomenon, improve the quality of heating, and achieved good energy efficiency and economic benefits. Operation comparison is shown in Table 1.

Table 1 a residential district heating installed balance valve flow deviation comparison table

ivalvu yokulungiswa ekwenzeni kwesistimu sokwenza ukusebenzisa enye - isiZulu

The data show that the district heating system installed balancing valve, each branch system flow distribution can reach the design of the calculated flow, the original for many years has not been hot user indoor temperature adjustment to more than 18 ℃; system exists in the over-flow and under-flow areas of the flow can be adjusted to the design of the calculated value of the end of the user flow can be guaranteed, the local phenomenon of overheating and overcooling can be resolved, the heating effect of stabilization. Some users due to private modification of the pipeline, resulting in part of the unit resistance is too large, through the balancing valve flow balance distribution, but also to achieve the calculated flow.

5 Ivalvu yokubala kwezinto ezihlukahlukene kwiqoqo lokuphefumula kwezinto zokugcina.

① hot and cold uneven phenomenon is eliminated, the quality of heat supply is guaranteed, the user complaint rate is reduced. ② heat source equipment capacity is given full play. (After the implementation of a district balancing valve renovation, the original boiler room to provide 190,000 m2 of heating area, the heating area increased to 230,000 m2, the heating effect is still stable and good. ③The purpose of energy saving in operation regulation is achieved. The heating system can accurately regulate the heating according to the temperature difference between supply and return water and the outdoor temperature, which achieves the purpose of energy saving and consumption reduction. (A residential district after the implementation of the balancing valve transformation, the building heating system return water temperature deviation of no more than 3 ℃) ④ to ensure that the circulating water pumps run in high-efficiency zone. Both save the operating costs and extend the service life of the circulating water pump.

Izinga: 6 Kwenzeka: Kufanele kube nokuthi kufinyeleleke.

Ukusebenzisa i-balancing valve ekulingiseni kwesistimu sokuphefumula kuyenza kube nokulingana kwe-hydraulic kwesistimu sokuphefumula futhi kufikelela into yokwenza kube nokusebenza okukhulu kanye nokwamukelwa okuncane, ukulingana kwe-hydraulic kanye nokuhamba kwesistimu yokuphefumula. Ngenxa yezinye izinto ezithile zokuthuthukiswa kwesistimu sokuphefumula, ukusebenzisa i-balancing valve yokulinganisa isistimu se-pipe network system kuyinto indlela esemthethweni yokulingana kwe-pipe network system. Ngokwesibonelo, kusukela ekusebenziseni kwesakhiwo sasekhaya, isistimu se-phefumula sasekhaya se-level yokuqala yasekhaya kungukuthi kudinga kakhulu ukufikelela ukulingana kwe-hydraulic. Ukuphathwa okunokwenzeka kwezindlela kanye nokhetho lokukhetha amadimitha we-pipe ngokwesiko lokuqondisa kwe-hydraulic kuyinto isifiso esiphakeme sokwenza kube nokulingana okuphefumulweni kwe-sistimu. Kodwa, indlela yokwenza kube nokulingana kwe-hydraulic ayidingi ukusebenzisa i-balancing valve ngaphandle kokusetting up juice kanye nokuhlanganisa kwe-hydraulic balance calculation ye-loop. Ukulingana kwe-hydraulic kwesistimu sokuphefumula kuzosiza ukunciphisa umzimba ngokwe-15-20%, futhi ukusebenzisa i-technology ye-hydraulic balance kuyinto indlela efanelekile yokuthuthukisa isimo esikhathini sokuphefumula futhi yokufuthelana nokunciphisa kwemvelo, okufanele kwenziwe kakhulu kanye nokuthuthukisa ekhonomikhi kanye nesizwe.