CN107843004B - Constant-temperature operation method of gas boiler - Google Patents
Constant-temperature operation method of gas boiler Download PDFInfo
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- CN107843004B CN107843004B CN201710942994.2A CN201710942994A CN107843004B CN 107843004 B CN107843004 B CN 107843004B CN 201710942994 A CN201710942994 A CN 201710942994A CN 107843004 B CN107843004 B CN 107843004B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/50—Water heaters for central heating incorporating heaters for domestic water incorporating domestic water tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention discloses a constant-temperature operation method of a gas boiler, which comprises the following steps: firstly, in the normal operation process, opening each shunt valve, each return valve and each first gas valve, closing each second gas valve and each regulating valve, and supplying gas to a gas boiler after passing through the first gas valves, the first gas branch pipes and the gas inlet pipes; starting the gas boiler and the circulating pump, and feeding hot water formed after heating into a water supply main pipe to supply to each heat consumption unit; returning water enters the gas-fired boiler through the circulating pump and the water returning main pipe to form a complete water path circulation; when the temperature monitoring control mechanism of the gas-fired boiler breaks down, the second gas valve is immediately opened, the first gas valve is closed, and gas is supplied to the gas-fired boiler through the hot water thermostatic valve of the gas-fired boiler; the opening degree of the regulating valve is controlled so as to control the outlet water temperature of the gas boiler. The constant temperature control can be realized by the operation of opening and closing the valve without special training of operators. The outlet water temperature set by the gas boiler can be controlled by controlling the opening degree of the regulating valve.
Description
Technical Field
The invention relates to the technical field of heat supply of gas boilers, in particular to a constant-temperature operation method of a gas boiler.
Background
With the development of economic society, the living standard of people is increasingly improved, and the northeast area basically realizes the total coverage of central heating, but in the middle area of China, the temperature is lower in winter, the coverage of the central heating is smaller, and a plurality of cells are not accessed to a heating company. Therefore, in the middle area of China, many communities are provided with heating systems. Coal-fired boilers have large pollution and are gradually eliminated; the gas boiler uses gas (such as natural gas, liquefied petroleum gas, etc.) as fuel, and heats water by a burner, so as to realize heating and provide hot water for life and bath, and the gas boiler is fast in heating, low in noise and free of dust, is an economical boiler variety which is very suitable for China conditions, and is increasingly widely applied to provide hot water for heating for more and more heat utilization units.
The intelligent gas boiler has high automation degree, and the outlet water temperature is monitored and controlled by a temperature sensor, an electric control device (a microcomputer controller) and a burner. The intelligent gas-fired boiler is high in cost and complex in mechanism, and in the later use process, once any link in the complex temperature monitoring and controlling mechanism has a problem, the outlet water temperature cannot be well controlled, particularly, the maintenance process needs long time, and the maintenance process has great influence on normal heat and common heat of a heat consumption unit. Of course, the maintenance cost of the intelligent gas boiler is also high. At present, a method for rapidly restoring constant temperature operation when a temperature monitoring control mechanism of a gas boiler fails is lacked.
Disclosure of Invention
The invention aims to provide a constant-temperature operation method for a gas boiler, which can quickly recover constant-temperature operation when a temperature monitoring and controlling mechanism of the gas boiler breaks down.
In order to achieve the purpose, the constant-temperature operation method of the gas boiler is carried out by using an expansion type constant-temperature hot water system, wherein the expansion type constant-temperature hot water system comprises the gas boiler, a water supply main pipe and a water return main pipe, a water inlet of the gas boiler is connected with the water return main pipe, and a water outlet of the gas boiler is connected with the water supply main pipe; the water return main pipe is connected with an expansion water tank, the expansion water tank is connected with a water supplementing pipe, the water supplementing pipe is connected with a water supplementing pump, the water supplementing pump is connected with a water supplementing tank, the water supplementing tank is connected with a water softener, and the water softener is connected with a municipal tap water pipe network; a circulating pump is arranged on a water return main pipe at the inlet of the gas boiler;
the end of the water supply main pipe, which is connected with the gas-fired boiler, is the starting end of the water supply main pipe, the tail end of the water supply main pipe is connected with a water distribution box, the water distribution box is connected with a plurality of water supply branch pipes, each water supply branch pipe is respectively provided with a water distribution valve, each water supply branch pipe is connected with a hot water inlet pipe of a heat consumption unit, and the expansion water tank is positioned at the topmost layer of the highest heat consumption unit;
one end of the return main pipe, which is connected with the gas boiler, is the starting end of the return main pipe, and the tail end of the return main pipe is connected with a water collecting tank; the water collecting tank is connected with a plurality of return water branch pipes, each return water branch pipe is provided with a return water valve, and each return water branch pipe is connected with a hot water outlet pipe of a heat utilization unit;
the gas boiler is connected with a gas inlet pipe, a first gas branch pipe and a second gas branch pipe are connected to the gas inlet pipe in parallel, a first gas valve is arranged on the first gas branch pipe, and a second gas valve and a gas boiler hot water thermostatic valve are arranged on the second gas branch pipe in series; a hot water cylinder is connected in series with a water supply main pipe at the outlet of the gas boiler, and the inner diameter of the hot water cylinder is larger than that of the water supply main pipe;
the gas boiler hot water thermostatic valve comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is connected with a valve core in a sliding manner, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively matched with the side wall of the inner cavity in a sliding and sealing manner; an annular cavity is defined by the top block, the bottom block, the connecting column and the side wall of the inner cavity; an air outlet hole is arranged in the valve body at one side, the inner end of the air outlet hole is communicated with the inner cavity of the valve body, the outer end of the air outlet hole is connected with an air outlet pipe, an air inlet hole is arranged in the valve body at the opposite side of the air outlet hole, the inner end of the air inlet hole is communicated with the inner cavity of the valve body, and the outer end of the;
a pressure spring is connected between the top end of the top block and the top wall of the inner cavity of the valve body; a push rod is pressed downwards on the bottom block, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and extends into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is formed in the fixed seat, and the lower part of the push rod extends downwards into the vertical through hole and is in sliding sealing fit with the wall of the vertical through hole; an opening at the lower end of the vertical through hole is connected with an expansion pipe, the expansion pipe is connected with a temperature sensing box, and expansion liquid is contained in the temperature sensing box; the temperature sensing box is arranged in the hot water cylinder;
the valve core is provided with an upper limit position and a lower limit position, and the air outlet hole is always communicated with the annular cavity when the valve core is positioned between the upper limit position and the lower limit position; when the valve core is positioned at the upper limit position, the air inlet hole is isolated from the annular cavity, when the valve core is positioned at the lower limit position, the valve core is at the initial position, and when the valve core is positioned at the initial position, the air inlet hole is completely communicated with the annular cavity; the valve core is provided with a balance position, the balance position of the valve core is positioned between the upper limit position and the lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity is higher than the top end of the air inlet hole, the bottom end of the annular cavity is lower than the top end of the air inlet hole, and the annular cavity and the air inlet hole are in a partially communicated state; the height of the annular cavity is equal to that of the air inlet hole; the hot water thermostatic valve of the gas boiler is connected in series with the second gas branch pipe through the gas outlet pipe and the gas inlet pipe;
the constant-temperature operation method of the gas boiler is sequentially carried out according to the following steps:
firstly, in the normal operation process, opening each shunt valve, each return valve and each first gas valve, closing each second gas valve and each regulating valve, and supplying gas to a gas boiler after passing through the first gas valves, the first gas branch pipes and the gas inlet pipes; starting the gas boiler and the circulating pump, heating circulating water in the gas boiler, and feeding hot water formed after heating into a water supply main pipe; meanwhile, the backwater enters a backwater main pipe after passing through a hot water outlet pipe, each backwater branch pipe and a water collecting tank of each heat consumption unit; the hot water exchanges heat with the return water when passing through the plate heat exchanger, and the temperature difference of the supply water and the return water is controlled within a preset range while the return water is preheated; hot water enters the water distribution box through the water supply main pipe after passing through the plate heat exchanger, and is supplied to each heat consumption unit through each water supply branch pipe and each hot water inlet pipe of each heat consumption unit; the return water enters the gas boiler through the circulating pump and the return water main pipe after passing through the plate heat exchanger, and a complete waterway circulation is formed; the expansion water tank ensures that the system has stable pressure, and when the water level in the expansion water tank is reduced, the water softener and the water replenishing pump are started to replenish water into the expansion water tank until the expansion water tank is filled with water;
when the temperature monitoring control mechanism of the gas-fired boiler breaks down, immediately opening the second gas valve, closing the first gas valve, supplying gas to the gas-fired boiler through the hot water thermostatic valve of the gas-fired boiler, and keeping the system to continue to operate;
the downward top pressure of the spring and the self weight of the valve core form a lower pressure to the valve core, the upward top pressure of the expansion liquid forms an upper pressure, and when the valve core works normally, the valve core is positioned at the balance position, and the upper pressure and the lower pressure reach a balance state;
when the outlet water temperature of the gas boiler exceeds a normal range, the volume of expansion liquid in the temperature sensing box is increased, then the upper pressure is increased, and the push rod and the valve core are pushed upwards to leave a balance position, so that the communication area between the annular cavity and the air inlet is reduced, and the air inflow of the gas boiler is reduced; when the water outlet temperature of the gas boiler is higher, the volume increment of the expansion liquid is larger, and the water outlet temperature of the gas boiler exceeds the set upper limit temperature, the valve core reaches the upper limit position of the valve core, and the air inlet is isolated from the annular cavity, so that the gas supply to the gas boiler is stopped; after the air inflow of the gas-fired boiler is reduced or interrupted, the temperature of the outlet water of the gas-fired boiler is gradually reduced, and after the volume of expansion liquid in the temperature sensing box is reduced, the valve core moves downwards under the action of the elastic force of the pressure spring until the valve core reaches the balance position of the valve core;
when the water outlet temperature of the gas boiler is lower than a normal range, the volume of expansion liquid in the temperature sensing box is reduced, then the upper pressure is reduced, and under the action of the elastic force of the pressure spring, the valve core is downwards away from a balance position, so that the communication area between the annular cavity and the air inlet hole is enlarged, the air inflow of the gas boiler is increased, when the water outlet temperature of the gas boiler is lower than a set lower limit temperature, the valve core reaches the lower limit position of the annular cavity, and the communication area between the air inlet hole and the annular cavity is maximized; after the air inflow of the gas-fired boiler is increased, the temperature of the outlet water of the gas-fired boiler is gradually increased, and after the volume of expansion liquid in the temperature sensing box is increased, the valve core moves upwards under the action of the elastic force of the pressure spring until the valve core reaches the balance position; when the valve core is stabilized at the balance position, the water outlet temperature of the gas boiler is kept at the preset water outlet temperature.
The temperature sensing box is connected with an adjusting pipe, the adjusting pipe is connected with an adjusting box, and an adjusting valve is arranged on the adjusting pipe; when the preset water outlet temperature of the gas-fired boiler needs to be increased, the regulating valve is opened;
the larger the opening degree of the regulating valve is, the more expansion liquid enters the regulating box, the less expansion liquid enters the vertical through hole in the fixed seat at the same water outlet temperature of the gas boiler, the smaller the upper pressure generated by the expansion liquid on the push rod is, and the lower the balance position of the corresponding valve core is; therefore, the larger the opening degree of the regulating valve is, the larger the communication area between the annular cavity and the air inlet hole is when the valve core is positioned at the balance position is, and the higher the heat production quantity of the corresponding gas-fired boiler and the water outlet temperature of the gas-fired boiler are;
controlling the opening degree of the regulating valve so as to control the outlet water temperature of the gas-fired boiler, and increasing the opening degree of the regulating valve when the outlet water temperature of the gas-fired boiler needs to be increased; and when the outlet water temperature of the gas boiler needs to be reduced, the opening degree of the regulating valve is reduced.
An upper positioning ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower positioning ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core.
The expansion liquid is mercury or ethanol.
The upper surface of the fixing seat surrounds the push rod and is provided with an upper sealing ring, and the lower surface of the fixing seat surrounds the expansion pipe and is provided with a lower sealing ring.
The control process of the invention is simple and convenient, and the constant temperature control of the temperature of the water outlet of the gas boiler can be realized by the simple operation of the switch valve without special training of operators.
The height position of the valve core balance position can be conveniently controlled by controlling the opening degree of the regulating valve, and further the outlet water temperature (namely the set outlet water temperature) of the gas boiler in a stable state is controlled.
When the temperature monitoring control mechanism of the gas boiler breaks down, the hot water thermostatic valve of the gas boiler can play a role only by closing the first gas valve and opening the second gas valve, the heat production quantity of the boiler is adjusted by adjusting the air input of the gas boiler, so that the thermostatic adjustment is realized, and the outlet water temperature of the gas boiler is controlled within a preset range. Compared with the prior shutdown maintenance mode (which needs 1-3 days), the method has the advantage that the influence on users is minimized.
In the heating season, the workload of manufacturer maintenance personnel is large, and the cost of accessories and labor cost are higher than those in the non-heating season. By using the structure of the invention, the shutdown time can be shortened, and the maintenance time of the gas boiler can be adjusted to the non-heating season, thereby saving the maintenance cost.
The gas boiler hot water thermostatic valve can utilize the characteristic that the volume of expansion liquid changes along with the temperature change, and the valve core moves downwards when the outlet water temperature of the gas boiler is higher by combining the elasticity of the spring, so that the air inflow is increased, the heat production capacity of the gas boiler is improved, and the outlet water temperature is increased; when the water outlet temperature of the gas boiler is lower, the valve core moves upwards, and the air inflow is reduced, so that the heat production quantity of the gas boiler is reduced, and the water outlet temperature is reduced.
The gas boiler hot water thermostatic valve does not need to be realized by an electric control system, a temperature sensor does not need to be arranged, and the electric control device compares and judges the water temperature and a set value, so that a pure mechanical structure is simpler than an electric control structure, and is not easy to break down, the equipment maintenance cost is greatly reduced, and the gas boiler hot water thermostatic valve can play a role rapidly when a temperature monitoring control mechanism of the gas boiler breaks down.
The expansion tank is positioned at the topmost layer of the heat utilization unit, so that stable and sufficient water pressure is ensured in the system, and a large amount of air is prevented from entering the circulating water system.
The differential pressure bypass valve can balance the differential pressure between the water supply and the water return, can improve the utilization rate of the system, keep the accurate mutual fixed value of the differential pressure, reduce the noise of the system and avoid the damage to equipment caused by the overlarge differential pressure between the water supply and the water return. The staff can adjust the opening degree according to the heat load condition of the heat consumption unit, and can ensure that a certain amount of water passes through the gas boiler when the heat consumption unit load is very small or zero, thereby protecting the gas boiler and playing the roles of saving energy and reducing consumption.
The plate heat exchanger can control the temperature difference of the supplied water and the returned water within a preset range, and the purpose of energy conservation is achieved. The flow balance valve can directly set the flow according to the design, the valve can automatically eliminate the residual pressure head of the pipeline and the flow deviation caused by pressure fluctuation under the action of water, and the set flow can be kept unchanged no matter how the system pressure changes. This makes pipe network flow control once accomplish, changes the work of transferring the net into simple flow distribution, solves the hydraulic balance imbalance problem of pipe network effectively.
Drawings
Fig. 1 is a schematic view of the construction of an expansion type constant temperature hot water system of the present invention;
FIG. 2 is a schematic structural diagram of a hot water thermostatic valve of a gas boiler with a valve core in a balanced position;
FIG. 3 is a schematic structural view of a hot water thermostatic valve of a gas boiler with a valve core located at a lower limit position;
fig. 4 is a schematic structural view of the gas boiler hot water thermostat valve with the valve core in the upper limit position.
Detailed Description
The invention discloses a constant-temperature operation method of a gas boiler, which is carried out by using an expansion type constant-temperature hot water system. As shown in fig. 1 to 4, the expansion type constant temperature hot water system includes a gas boiler 1, a water supply main pipe 2 and a water return main pipe 3, a water inlet of the gas boiler 1 is connected with the water return main pipe 3, and a water outlet of the gas boiler 1 is connected with the water supply main pipe 2; the water return main pipe 3 is connected with an expansion water tank 4, the expansion water tank 4 is connected with a water supplementing pipe 5, the water supplementing pipe 5 is connected with a water supplementing pump 6, the water supplementing pump 6 is connected with a water supplementing tank 7, the water supplementing tank 7 is connected with a water softener 8, and the water softener 8 is connected with a municipal tap water pipe network; a circulating pump 9 is arranged on the return water main pipe 3 at the inlet of the gas boiler 1;
the end of the water supply main pipe 2 connected with the gas boiler 1 is the starting end, the tail end of the water supply main pipe 2 is connected with a water distribution box 10, the water distribution box 10 is connected with a plurality of water supply branch pipes 11, each water supply branch pipe 11 is respectively provided with a water distribution valve 12, each water supply branch pipe 11 is connected with a hot water inlet pipe of a heat consumption unit, and the expansion water tank 4 is positioned at the topmost layer of the highest heat consumption unit;
one end of the return main pipe 3 connected with the gas boiler 1 is the starting end of the return main pipe, and the tail end of the return main pipe 3 is connected with a water collecting tank 13; the water collecting tank 13 is connected with a plurality of return branch pipes 14, each return branch pipe 14 is provided with a return valve 15, and each return branch pipe 14 is connected with a hot water outlet pipe of a heat utilization unit; the heat utilization unit and the hot water inlet pipe and the hot water outlet pipe thereof are conventional technologies and are not shown in the figure.
The gas boiler 1 is connected with a gas inlet pipe 16, the gas inlet pipe 16 is connected with a first gas branch pipe 17 and a second gas branch pipe 18 in parallel, the first gas branch pipe 17 is provided with a first gas valve 19, and the second gas branch pipe 18 is connected with a second gas valve 20 and a gas boiler hot water thermostatic valve 21 in series; a hot water cylinder 22 is connected in series with the water supply main pipe 2 at the outlet of the gas boiler 1, and the inner diameter of the hot water cylinder 22 is larger than that of the water supply main pipe 2;
the gas boiler hot water thermostatic valve 21 comprises a valve body 23, wherein a vertically arranged inner cavity 24 is arranged in the valve body 23, the horizontal section of the inner cavity 24 is circular, the side wall of the inner cavity 24 is connected with a valve core in a sliding manner, the valve core comprises a top block 25, a bottom block 26 and a connecting column 27 connected between the top block 25 and the bottom block 26, and the top block 25 and the bottom block 26 are respectively matched with the side wall of the inner cavity 24 in a sliding and sealing manner; the top block 25, the bottom block 26, the connecting column 27 and the side wall of the inner cavity 24 enclose an annular cavity 28; an air outlet hole 29 is formed in the valve body 23 on one side, the inner end of the air outlet hole 29 is communicated with the inner cavity 24 of the valve body 23, the outer end of the air outlet hole 29 is connected with an air outlet pipe 30, an air inlet hole 31 is formed in the valve body 23 on the opposite side of the air outlet hole 29, the inner end of the air inlet hole 31 is communicated with the inner cavity 24 of the valve body 23, and the outer end of the air;
a pressure spring 33 is connected between the top end of the top block 25 and the top wall of the inner cavity 24 of the valve body 23; a push rod 34 is pressed downwards on the bottom block 26, the diameter of the upper part of the push rod 34 is larger than that of the lower part, the upper part of the push rod 34 penetrates through the valve body 23 and extends into the inner cavity 24 of the valve body 23, the upper part of the push rod 34 is in sliding sealing fit with the valve body 23, and the top end of the push rod 34 is in pressing fit with the bottom block 26; a fixed seat 35 is arranged below the valve body 23, a vertical through hole is formed in the fixed seat 35, and the lower part of the push rod 34 extends downwards into the vertical through hole and is in sliding sealing fit with the hole wall of the vertical through hole; an expansion pipe 36 is connected to an opening at the lower end of the vertical through hole, the expansion pipe 36 is connected with a temperature sensing box 37, and expansion liquid 38 is contained in the temperature sensing box 37; the temperature sensing box 37 is arranged in the hot water cylinder 22; during operation, the expansion pipe 36 and the vertical through hole are filled with expansion liquid 38.
The valve core has an upper limit position and a lower limit position, and the air outlet 29 is always communicated with the annular cavity 28 when the valve core is positioned between the upper limit position and the lower limit position; when the valve core is positioned at the upper limit position, the air inlet hole 31 is isolated from the annular cavity 28, when the valve core is positioned at the lower limit position, the valve core is at the initial position, and when the valve core is positioned at the initial position, the air inlet hole 31 is completely communicated with the annular cavity 28; the valve core is provided with a balance position, the balance position of the valve core is positioned between the upper limit position and the lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity 28 is higher than the top end of the air inlet hole 31, the bottom end of the annular cavity 28 is lower than the top end of the air inlet hole 31, and the annular cavity 28 and the air inlet hole 31 are in a partially communicated state; the height of the annular cavity 28 is equal to the height of the intake holes 31; the gas boiler hot water thermostatic valve 21 is connected in series to the second gas branch pipe 18 through its gas outlet pipe 30 and gas inlet pipe 32.
More than two sets of the gas-fired boiler 1 are arranged between the water supply main pipe 2 and the water return main pipe 3 in parallel; thereby increasing the heating capacity of the system and increasing the heating service area.
More than two sets of circulating pumps 9 are arranged in parallel; thereby increasing the flow rate of the supplied water and improving the ability to stably supply water to higher floors.
The expansion type constant-temperature hot water system further comprises a plate type heat exchanger 42, wherein the plate type heat exchanger 42 comprises a first inlet 43, a second inlet 44, a first outlet 45 and a second outlet 46, the first inlet 43 and the first outlet 45 are connected to the water supply main pipe 2 in series, and the second inlet 44 and the second outlet 46 are connected to the water return main pipe 3 in series; a flow balance valve 47 is arranged on the pipeline at the first outlet 45.
The plate heat exchanger 42 can control the temperature difference of the supplied water and the returned water within a preset range, and the purpose of energy conservation is achieved. The flow balance valve 47 can directly set the flow according to the design, the valve can automatically eliminate the residual pressure head of the pipeline and the flow deviation caused by pressure fluctuation under the action of water, and the set flow can be kept unchanged no matter how the system pressure changes. This makes pipe network flow control once accomplish, changes the work of transferring the net into simple flow distribution, solves the hydraulic balance imbalance problem of pipe network effectively.
The plate heat exchanger 42 is provided with more than two sets in parallel, thereby increasing the heat exchange capacity and reducing the temperature difference of the supplied water and the returned water.
The bottom ends of the water distribution box 10 and the water collection box 13 are respectively connected with a water drain valve 48.
A bypass pipe 49 is connected between the water diversion box 10 and the water collection box 13, and a differential pressure bypass valve 50 is arranged on the bypass pipe 49. The differential pressure bypass valve 50 can balance the differential pressure between the supply water and the return water, improve the utilization rate of the system, keep the accurate mutual fixed value of the differential pressure, reduce the noise of the system and avoid the damage to the equipment caused by the overlarge differential pressure between the supply water and the return water. The staff can be according to with the thermal load condition adjustment opening degree of heat unit, also can guarantee that a certain amount of water passes through in the gas boiler 1 when with the heat unit load very little or zero, has protected gas boiler 1 to also play energy saving and consumption reduction's effect.
The side wall of the inner cavity 24 at the upper limit position of the valve core is provided with an upper positioning ring 51, and the side wall of the inner cavity 24 at the lower limit position of the valve core is provided with a lower positioning ring 52. The upper positioning ring 51 and the lower positioning ring 52 can define the upper limit position and the lower limit position of the spool.
The temperature sensing box 37 is connected with an adjusting pipe 39, the adjusting pipe 39 is connected with an adjusting box 40, and the adjusting pipe 39 is provided with an adjusting valve 41.
The expansion liquid 38 is mercury or ethanol. The mercury and the ethanol have larger expansion coefficients, and the volume of the mercury and the ethanol is changed greatly along with the change of temperature, so that the change of the production pressure enables the valve core to have relatively larger stroke.
The upper surface of the fixed seat 35 is provided with an upper sealing ring 53 surrounding the push rod 34, and the lower surface of the fixed seat 35 is provided with a lower sealing ring 54 surrounding the expansion pipe 36. Thereby enhancing the sealing performance at the two locations.
The constant-temperature operation method of the gas boiler is sequentially carried out according to the following steps:
firstly, in the normal operation process, opening each shunt valve 12, the return valve 15 and the first gas valve 19, closing the second gas valve 20 and the regulating valve 41, and supplying gas to the gas boiler 1 after passing through the first gas valve 19, the first gas branch pipe 17 and the gas inlet pipe 16; starting the gas boiler 1 and the circulating pump 9, heating circulating water in the gas boiler 1, and feeding hot water formed after heating into the water supply main pipe 2; meanwhile, the backwater enters the backwater main pipe 3 after passing through the hot water outlet pipes of all heat utilization units, the backwater branch pipes 14 and the water collecting tank 13; the hot water exchanges heat with the return water when passing through the plate heat exchanger 42, and the temperature difference of the supply water and the return water is controlled within a preset range while the return water is preheated; hot water enters the water distribution box 10 through the water supply main pipe 2 after passing through the plate heat exchanger 42, and is supplied to each heat consumption unit through each water supply branch pipe 11 and the hot water inlet pipe of each heat consumption unit; the return water enters the gas boiler 1 through the circulating pump 9 and the return water main pipe 3 after passing through the plate heat exchanger 42, and a complete waterway circulation is formed; the expansion water tank 4 ensures that the system has stable pressure, and when the water level in the expansion water tank 4 is reduced, the water softener 8 and the water replenishing pump 6 are started to replenish water into the expansion water tank 4 until the expansion water tank 4 is filled with water;
when the temperature monitoring control mechanism of the gas boiler 1 breaks down, immediately opening the second gas valve 20, closing the first gas valve 19, supplying gas to the gas boiler 1 through the gas boiler hot water thermostatic valve 21, and keeping the system to continue to operate;
the downward top pressure of the spring and the self weight of the valve core form a lower pressure to the valve core, the upward top pressure of the expansion liquid 38 forms an upper pressure, and when the valve core works normally, the valve core is positioned at the balance position, and the upper pressure and the lower pressure reach a balance state;
when the temperature of the outlet water of the gas boiler 1 exceeds a normal range, the volume of the expansion liquid 38 in the temperature sensing box 37 is increased, then the upper pressure is increased, the push rod 34 and the valve core are pushed to move upwards to leave a balance position, so that the communication area of the annular cavity 28 and the air inlet hole 31 is reduced, and the air inlet amount of the gas boiler 1 is reduced; the higher the outlet water temperature of the gas boiler 1 is, the larger the volume increment of the expansion liquid 38 is, when the outlet water temperature of the gas boiler 1 exceeds the set upper limit temperature, the valve core reaches the upper limit position thereof, and the air inlet hole 31 is isolated from the annular cavity 28, so that the supply of gas to the gas boiler 1 is stopped; after the air inflow of the gas-fired boiler 1 is reduced or interrupted, the temperature of the outlet water of the gas-fired boiler 1 is gradually reduced, and after the volume of the expansion liquid 38 in the temperature sensing box 37 is reduced, the valve core moves downwards under the action of the elastic force of the pressure spring 33 until the valve core reaches the balance position;
when the temperature of the outlet water of the gas boiler 1 is lower than a normal range, the volume of the expansion liquid 38 in the temperature sensing box 37 is reduced, then the upper pressure is reduced, and under the action of the elastic force of the pressure spring 33, the valve core is downwards away from a balance position, so that the communication area of the annular cavity 28 and the air inlet hole 31 is enlarged, the air inlet amount of the gas boiler 1 is increased, when the temperature of the outlet water of the gas boiler 1 is lower than a set lower limit temperature, the valve core reaches the lower limit position, and the communication area of the air inlet hole 31 and the annular cavity 28 is; after the air inflow of the gas-fired boiler 1 is increased, the water outlet temperature of the gas-fired boiler 1 is gradually increased, and after the volume of the expansion liquid 38 in the temperature sensing box 37 is increased, the valve core moves upwards under the action of the elastic force of the pressure spring 33 until the valve core reaches the balance position; when the valve core is stabilized at the equilibrium position, the water outlet temperature of the gas boiler 1 is kept at the preset water outlet temperature.
When the preset outlet water temperature of the gas boiler 1 needs to be increased, the regulating valve 41 is opened;
the larger the opening degree of the regulating valve 41 is, the more the expansion liquid 38 enters the regulating box 40, the less the expansion liquid 38 enters the vertical through hole in the fixed seat 35 at the same outlet water temperature of the gas boiler 1, the smaller the upper pressure generated by the expansion liquid 38 on the push rod 34 is, and the lower the equilibrium position of the corresponding valve core is; therefore, the larger the opening degree of the regulating valve 41 is, the larger the communication area between the annular cavity 28 and the air inlet 31 when the valve core is located at the equilibrium position is, and the higher the heat generation amount of the corresponding gas boiler 1 and the outlet water temperature of the gas boiler 1 are;
controlling the opening degree of the regulating valve 41 so as to control the outlet water temperature of the gas boiler 1, and increasing the opening degree of the regulating valve 41 when the outlet water temperature of the gas boiler 1 needs to be increased; when the outlet water temperature of the gas boiler 1 needs to be lowered, the opening degree of the regulating valve 41 is adjusted to be small.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The constant-temperature operation method of the gas boiler is characterized by comprising the following steps: the method is carried out by using an expansion type constant-temperature hot water system, wherein the expansion type constant-temperature hot water system comprises a gas-fired boiler, a water supply main pipe and a water return main pipe, a water inlet of the gas-fired boiler is connected with the water return main pipe, and a water outlet of the gas-fired boiler is connected with the water supply main pipe; the water return main pipe is connected with an expansion water tank, the expansion water tank is connected with a water supplementing pipe, the water supplementing pipe is connected with a water supplementing pump, the water supplementing pump is connected with a water supplementing tank, the water supplementing tank is connected with a water softener, and the water softener is connected with a municipal tap water pipe network; a circulating pump is arranged on a water return main pipe at the inlet of the gas boiler;
the end of the water supply main pipe, which is connected with the gas-fired boiler, is the starting end of the water supply main pipe, the tail end of the water supply main pipe is connected with a water distribution box, the water distribution box is connected with a plurality of water supply branch pipes, each water supply branch pipe is respectively provided with a water distribution valve, each water supply branch pipe is connected with a hot water inlet pipe of a heat consumption unit, and the expansion water tank is positioned at the topmost layer of the highest heat consumption unit;
one end of the return main pipe, which is connected with the gas boiler, is the starting end of the return main pipe, and the tail end of the return main pipe is connected with a water collecting tank; the water collecting tank is connected with a plurality of return water branch pipes, each return water branch pipe is provided with a return water valve, and each return water branch pipe is connected with a hot water outlet pipe of a heat utilization unit;
the gas boiler is connected with a gas inlet pipe, a first gas branch pipe and a second gas branch pipe are connected to the gas inlet pipe in parallel, a first gas valve is arranged on the first gas branch pipe, and a second gas valve and a gas boiler hot water thermostatic valve are arranged on the second gas branch pipe in series; a hot water cylinder is connected in series with a water supply main pipe at the outlet of the gas boiler, and the inner diameter of the hot water cylinder is larger than that of the water supply main pipe;
the gas boiler hot water thermostatic valve comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is connected with a valve core in a sliding manner, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively matched with the side wall of the inner cavity in a sliding and sealing manner; an annular cavity is defined by the top block, the bottom block, the connecting column and the side wall of the inner cavity; an air outlet hole is arranged in the valve body at one side, the inner end of the air outlet hole is communicated with the inner cavity of the valve body, the outer end of the air outlet hole is connected with an air outlet pipe, an air inlet hole is arranged in the valve body at the opposite side of the air outlet hole, the inner end of the air inlet hole is communicated with the inner cavity of the valve body, and the outer end of the;
a pressure spring is connected between the top end of the top block and the top wall of the inner cavity of the valve body; a push rod is pressed downwards on the bottom block, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and extends into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is formed in the fixed seat, and the lower part of the push rod extends downwards into the vertical through hole and is in sliding sealing fit with the wall of the vertical through hole; an opening at the lower end of the vertical through hole is connected with an expansion pipe, the expansion pipe is connected with a temperature sensing box, and expansion liquid is contained in the temperature sensing box; the temperature sensing box is arranged in the hot water cylinder;
the valve core is provided with an upper limit position and a lower limit position, and the air outlet hole is always communicated with the annular cavity when the valve core is positioned between the upper limit position and the lower limit position; when the valve core is positioned at the upper limit position, the air inlet hole is isolated from the annular cavity, when the valve core is positioned at the lower limit position, the valve core is at the initial position, and when the valve core is positioned at the initial position, the air inlet hole is completely communicated with the annular cavity; the valve core is provided with a balance position, the balance position of the valve core is positioned between the upper limit position and the lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity is higher than the top end of the air inlet hole, the bottom end of the annular cavity is lower than the top end of the air inlet hole, and the annular cavity and the air inlet hole are in a partially communicated state; the height of the annular cavity is equal to that of the air inlet hole; the hot water thermostatic valve of the gas boiler is connected in series with the second gas branch pipe through the gas outlet pipe and the gas inlet pipe; the water supply system also comprises a plate heat exchanger, wherein the plate heat exchanger comprises a first inlet, a second inlet, a first outlet and a second outlet, the first inlet and the first outlet are connected in series to the water supply main pipe, and the second inlet and the second outlet are connected in series to the water return main pipe;
the constant-temperature operation method of the gas boiler is sequentially carried out according to the following steps:
firstly, in the normal operation process, opening each shunt valve, each return valve and each first gas valve, closing each second gas valve and each regulating valve, and supplying gas to a gas boiler after passing through the first gas valves, the first gas branch pipes and the gas inlet pipes; starting the gas boiler and the circulating pump, heating circulating water in the gas boiler, and feeding hot water formed after heating into a water supply main pipe; meanwhile, the backwater enters a backwater main pipe after passing through a hot water outlet pipe, each backwater branch pipe and a water collecting tank of each heat consumption unit; the hot water exchanges heat with the return water when passing through the plate heat exchanger, and the temperature difference of the supply water and the return water is controlled within a preset range while the return water is preheated; hot water enters the water distribution box through the water supply main pipe after passing through the plate heat exchanger, and is supplied to each heat consumption unit through each water supply branch pipe and each hot water inlet pipe of each heat consumption unit; the return water enters the gas boiler through the circulating pump and the return water main pipe after passing through the plate heat exchanger, and a complete waterway circulation is formed; the expansion water tank ensures that the system has stable pressure, and when the water level in the expansion water tank is reduced, the water softener and the water replenishing pump are started to replenish water into the expansion water tank until the expansion water tank is filled with water;
when the temperature monitoring control mechanism of the gas-fired boiler breaks down, immediately opening the second gas valve, closing the first gas valve, supplying gas to the gas-fired boiler through the hot water thermostatic valve of the gas-fired boiler, and keeping the system to continue to operate;
the downward top pressure of the spring and the self weight of the valve core form a lower pressure to the valve core, the upward top pressure of the expansion liquid forms an upper pressure, and when the valve core works normally, the valve core is positioned at the balance position, and the upper pressure and the lower pressure reach a balance state;
when the outlet water temperature of the gas boiler exceeds a normal range, the volume of expansion liquid in the temperature sensing box is increased, then the upper pressure is increased, and the push rod and the valve core are pushed upwards to leave a balance position, so that the communication area between the annular cavity and the air inlet is reduced, and the air inflow of the gas boiler is reduced; when the water outlet temperature of the gas boiler is higher, the volume increment of the expansion liquid is larger, and the water outlet temperature of the gas boiler exceeds the set upper limit temperature, the valve core reaches the upper limit position of the valve core, and the air inlet is isolated from the annular cavity, so that the gas supply to the gas boiler is stopped; after the air inflow of the gas-fired boiler is reduced or interrupted, the temperature of the outlet water of the gas-fired boiler is gradually reduced, and after the volume of expansion liquid in the temperature sensing box is reduced, the valve core moves downwards under the action of the elastic force of the pressure spring until the valve core reaches the balance position of the valve core;
when the water outlet temperature of the gas boiler is lower than a normal range, the volume of expansion liquid in the temperature sensing box is reduced, then the upper pressure is reduced, and under the action of the elastic force of the pressure spring, the valve core is downwards away from a balance position, so that the communication area between the annular cavity and the air inlet hole is enlarged, the air inflow of the gas boiler is increased, when the water outlet temperature of the gas boiler is lower than a set lower limit temperature, the valve core reaches the lower limit position of the annular cavity, and the communication area between the air inlet hole and the annular cavity is maximized; after the air inflow of the gas-fired boiler is increased, the temperature of the outlet water of the gas-fired boiler is gradually increased, and after the volume of expansion liquid in the temperature sensing box is increased, the valve core moves upwards under the action of the elastic force of the pressure spring until the valve core reaches the balance position;
when the valve core is stabilized at the balance position, the water outlet temperature of the gas boiler is kept at the preset water outlet temperature.
2. The gas boiler constant temperature operation method according to claim 1, characterized in that: the temperature sensing box is connected with an adjusting pipe, the adjusting pipe is connected with an adjusting box, and an adjusting valve is arranged on the adjusting pipe; when the preset water outlet temperature of the gas-fired boiler needs to be increased, the regulating valve is opened;
the larger the opening degree of the regulating valve is, the more expansion liquid enters the regulating box, the less expansion liquid enters the vertical through hole in the fixed seat at the same water outlet temperature of the gas boiler, the smaller the upper pressure generated by the expansion liquid on the push rod is, and the lower the balance position of the corresponding valve core is; therefore, the larger the opening degree of the regulating valve is, the larger the communication area between the annular cavity and the air inlet hole is when the valve core is positioned at the balance position is, and the higher the heat production quantity of the corresponding gas-fired boiler and the water outlet temperature of the gas-fired boiler are;
controlling the opening degree of the regulating valve so as to control the outlet water temperature of the gas-fired boiler, and increasing the opening degree of the regulating valve when the outlet water temperature of the gas-fired boiler needs to be increased; and when the outlet water temperature of the gas boiler needs to be reduced, the opening degree of the regulating valve is reduced.
3. The gas boiler constant temperature operation method according to claim 1, characterized in that: an upper positioning ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower positioning ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core.
4. The gas boiler constant temperature operation method according to claim 1, characterized in that: the expansion liquid is mercury or ethanol.
5. The gas boiler constant temperature operation method according to claim 1, characterized in that: the upper surface of the fixing seat surrounds the push rod and is provided with an upper sealing ring, and the lower surface of the fixing seat surrounds the expansion pipe and is provided with a lower sealing ring.
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| CN107860065B (en) * | 2017-11-10 | 2023-10-24 | 西藏世峰高科能源技术有限公司 | Charging pile monitoring room air conditioning system |
| CN110966772B (en) * | 2019-11-30 | 2021-12-17 | 陕西强德泰亿诺节能环保设备有限公司 | Multi-medium multi-temperature intelligent heating system and method |
| CN112984603A (en) * | 2021-03-03 | 2021-06-18 | 济宁华源热电有限公司 | Heat supply and matched implementation device |
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| CN201047660Y (en) * | 2007-06-01 | 2008-04-16 | 青岛青义锅炉有限公司 | Gas-combustion boiler and thermal cycle device |
| CN101655166A (en) * | 2008-08-20 | 2010-02-24 | 全龙浩 | Mixed water valve for automatically limiting flow |
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