CN112066553A - Solid electric heat accumulation boiler provided with heat exchange tubes - Google Patents
Solid electric heat accumulation boiler provided with heat exchange tubes Download PDFInfo
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- CN112066553A CN112066553A CN202010972729.0A CN202010972729A CN112066553A CN 112066553 A CN112066553 A CN 112066553A CN 202010972729 A CN202010972729 A CN 202010972729A CN 112066553 A CN112066553 A CN 112066553A
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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
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/0208—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply
- F24H7/0233—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply the transfer fluid being water
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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
- F24H9/0005—Details for water heaters
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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
- F24H9/1818—Arrangement or mounting of electric heating means
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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
- F24H2250/00—Electrical heat generating means
- F24H2250/02—Resistances
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a solid electric heat accumulation boiler provided with heat exchange tubes, which comprises a boiler body, wherein the boiler body comprises a shell; a heat-insulating layer is arranged in the furnace shell; an insulating base is arranged at the bottom of the boiler body; a heat accumulator is arranged above the insulating base; the heat accumulator is internally provided with an electric heating wire; the heat accumulator is formed by arranging a plurality of heat accumulation brick walls in parallel; a heat exchange system is arranged in the heat accumulator; the connection mode of the heat exchange system is a Z-shaped connection upper and lower axisymmetric structure; the heat exchange system structure comprises heat exchange branch pipes; the upper ends of the heat exchange branch pipes are communicated with the upper heat exchange main pipe, and the lower ends of the heat exchange branch pipes are communicated with the lower heat exchange main pipe. The solid electric heat storage boiler provided with the heat exchange tubes saves the occupied area and the occupied space; the heat storage boiler cancels heat exchange of circulating air, and reduces the occurrence of short circuit caused by contact of the circulating air and the electric heating wire; the step of intermediate heat exchange is saved, and the volume of the boiler is reduced; the later-stage operation cost is reduced, and the heat exchange efficiency is improved.
Description
Technical Field
The invention relates to the technical field of heating equipment, in particular to a solid electric heat storage boiler with heat exchange tubes.
Background
At present, the domestic solid electric heat storage boiler is structurally built by arranging and combining a plurality of heat storage bricks to form a cuboid for storing heat, wherein heating wires are inserted into the heat storage bricks, the heat storage bricks are heated by the purpose, a plurality of hole air channels are arranged in the heat storage bricks, and when heat is needed, air in the air channels and the heat storage bricks are subjected to heat exchange by mechanical circulation so as to heat the air. And a steam-water heat exchanger device is arranged outside the solid electric heat storage boiler, and heated air flows through the steam-water heat exchanger through mechanical circulation to transfer the part of heat to a heat supply system.
Although the existing solid electric heat accumulation boiler can fully utilize the advantage of peak-valley electricity price, the heat accumulator is heated by utilizing valley electricity, and when heat is needed, the air is used as a transmission medium to achieve heat transfer, so that the heat is supplied to a heat supply system. The existing device still has the defects that the specific heat capacity of air is generally smaller, more air flow is needed for heat exchange when the heat demand is met, and the flow and the power of a mechanical fan are in direct proportion. The power should also be adjusted to the corresponding power. The power is generally larger at this moment, and the operation cost is increased; because the specific heat capacity of air is small, the sectional area of an opening air channel in the heat accumulator is generally larger in design, and the whole volume of the solid electric heat accumulation boiler is also larger. Meanwhile, a steam-water heat exchanger device is also required to be arranged in the traditional solid electric heat storage boiler system. The solid heat storage boiler of traditional design is bulky and occupies the area of boiler room also more, does not accord with economic principle.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the solid electric heat storage boiler with the heat exchange tubes, which saves the floor area, reduces the later operation cost and improves the heat exchange efficiency.
The technical scheme adopted by the invention is as follows:
a solid electric heat accumulation boiler provided with a heat exchange pipe,
comprises a boiler body, wherein the boiler body comprises a shell; a heat-insulating layer is arranged in the furnace shell;
the heat insulation layer is internally provided with heat insulation cotton;
an insulating base is arranged at the bottom of the boiler body;
a heat accumulator is arranged above the insulating base;
the heat accumulator is internally provided with an electric heating wire;
the heat accumulator is formed by arranging a plurality of heat accumulation brick walls in parallel;
a heat exchange system is arranged in the heat accumulator;
the connection mode of the heat exchange system is a Z-shaped connection upper and lower axisymmetric structure;
the heat exchange system structure comprises heat exchange branch pipes;
the upper ends of the heat exchange branch pipes are communicated with the upper heat exchange main pipe;
the lower ends of the heat exchange branch pipes are communicated with the lower heat exchange main pipe;
the upper heat exchange main pipe is communicated with a main water supply pipe;
the lower heat exchange main pipe is communicated with the main water return pipe.
The structure of the wall body built by the heat storage bricks is a heat storage brick wall;
a plurality of circular pore channels are arranged between the adjacent heat storage brick walls in the vertical direction;
a heat exchange branch pipe is arranged in the circular pore passage;
the diameter of the circular pore passage is the diameter of the heat exchange branch pipe.
A plurality of equidistant semi-cylindrical grooves are formed in the two surfaces of each heat storage brick wall in the vertical direction;
the diameter of the semi-cylindrical groove is the diameter of the heat exchange branch pipe.
The semi-cylindrical grooves of the adjacent heat storage brick walls are tightly fit with the heat exchange branch pipes in the middle;
the adjacent heat storage brick walls are arranged in a parallel and compact mode.
The heat storage brick wall is provided with a plurality of circular cavities with the same size in the horizontal direction;
the round cavity is internally provided with an electric heating wire.
The heating wire is electrified to heat the heat accumulator;
the heat accumulator stores heat and transfers the heat to the heat exchange branch pipe in a heat conduction mode.
The distance between the heat exchange branch pipes is determined by design calculation, and the heat exchange pipe bank is formed by the heat exchange branch pipes in the middle of the two heat storage brick walls.
A plurality of heat exchange branch pipes are vertically and upwardly connected with an upper heat exchange main pipe;
the upper part of the heat exchange tube row is connected with the upper heat exchange main tubes, and each upper heat exchange main tube is arranged in parallel in the horizontal direction;
the lower part of the heat exchange branch pipe is connected with a lower heat exchange main pipe;
the heat exchange tube bank is connected with the lower heat exchange main tubes, each lower heat exchange main tube is arranged in parallel in the horizontal direction, and the upper heat exchange main tubes are vertically connected with the main water supply tube.
The lower heat exchange main pipe is vertically connected with the main water return pipe;
the main water supply pipe is arranged above the solid heat storage boiler, and the main water return pipe is arranged below the solid heat storage boiler.
A plurality of heat exchange branch pipes are arranged between the two heat storage brick walls in parallel at equal intervals.
Compared with the prior art, the invention has the beneficial effects that:
the solid electric heat accumulation boiler provided with the heat exchange tubes saves the occupied area and the occupied space. The traditional solid heat storage boiler adopts air as a medium to transfer heat in a heat storage material, and the air transfers the heat to a heat supply network pipeline through a heat exchanger.
The solid electric heat accumulation boiler provided with the heat exchange tubes reduces the later operation cost and improves the heat exchange efficiency.
The solid electric heat accumulation boiler provided with the heat exchange tubes replaces an air system of a traditional heat accumulation boiler system with the heat exchange tubes and cancels a steam-water heat exchanger. Under the condition that the heat demand of users is large, the mechanical circulation power needs to be increased compared with the traditional heat storage boiler. The specific heat capacity of air is known to be much smaller than that of water, so that the power of the traditional boiler fan is higher than that of a water pump of the novel solid heat storage boiler system designed at this time. Therefore, the invention saves a part of electricity cost.
The traditional heat storage boiler also has a steam-water heat exchange process, the heat exchange efficiency of the steam-water heat exchanger in the process cannot reach one hundred percent, and certain heat loss is caused. When the fan is designed, the flow of air is designed to be a little more, and the fan power is designed to be a little higher so as to meet the requirements of users. Therefore, the invention also improves the heat exchange efficiency.
A large amount of air circulates inside a traditional solid heat storage boiler, the circulating air can contact with an electric heating wire for a long time, the electric heating wire easily breaks down the air under the condition of high voltage, and positive and negative charges formed by air breakdown are migrated around the electric heating wire. Because air is circulated, the short circuit is very easy to occur.
The solid electric heat accumulation boiler provided with the heat exchange tubes cancels heat exchange of circulating air, and reduces the occurrence of short circuit caused by contact of the circulating air and the electric heating wires.
Drawings
FIG. 1 is a schematic sectional top view of a solid electric heat storage boiler of the present invention provided with heat exchange tubes;
FIG. 2 is a front cross-sectional structural view of the solid electric heat storage boiler of the present invention provided with heat exchange tubes;
FIG. 3 is a schematic diagram of the heat storage brick wall and heat exchange tube bank of the solid electric heat storage boiler provided with heat exchange tubes according to the present invention as viewed from the right;
fig. 4 is a schematic view of the construction of a heat accumulator of a solid electric heat storage boiler provided with heat exchange tubes according to the present invention.
In the drawings, the main parts are illustrated by symbols:
in the figure:
1. boiler shell 2 and heat accumulator
3. Insulating base 4, heating wire
5. Main water supply pipe 6 and main water return pipe
7. Heat storage brick wall 8 and upper heat exchange main pipe
9. Lower heat exchange main pipe 10 and heat exchange branch pipe
11. Reserved cavity 12 for placing electric heating wire and atmosphere communicating pipe
13. Drainage opening 14 and thermometer reserved opening
15. Pressure gauge reserved port 16 and heat exchange tube row
17. And (7) an insulating layer.
Detailed Description
The invention is described in detail below with reference to the figures and examples:
as can be seen from fig. 1-4, a solid electric heat storage boiler provided with heat exchange tubes,
comprises a boiler body, wherein the boiler body comprises a shell 1; a heat-insulating layer is arranged in the furnace shell 1;
the heat insulation layer is internally provided with heat insulation cotton 17;
an insulating base 3 is arranged at the bottom of the boiler body;
a heat accumulator 2 is arranged above the insulating base 3;
the heat accumulator 2 is internally provided with an electric heating wire 4;
the heat accumulator 2 is formed by arranging a plurality of heat accumulation brick walls in parallel; at least two groups of heat storage brick walls are arranged in parallel, and the heat storage material is magnesia brick.
A heat exchange system is arranged in the heat accumulator 2;
the connection mode of the heat exchange system is a Z-shaped connection upper and lower axisymmetric structure;
the heat exchange system structure comprises a heat exchange branch pipe 10;
the upper ends of the heat exchange branch pipes 10 are communicated with the upper heat exchange main pipe 8;
the lower ends of the heat exchange branch pipes 10 are communicated with the lower heat exchange main pipe 9;
the upper heat exchange main pipe 8 is communicated with a main water supply pipe 5;
the lower heat exchange main pipe 9 is communicated with the main water return pipe 6.
A plurality of heat exchange branch pipes 10 are arranged between the two heat storage brick walls 7 side by side at equal intervals.
The structure of the wall body built by the heat storage bricks is a heat storage brick wall 7;
a plurality of circular pore channels are arranged between the adjacent heat storage brick walls 7 in the vertical direction;
a heat exchange branch pipe 10 is arranged in the circular pore passage;
the diameter of the circular hole is the diameter of the heat exchange branch pipe 10.
A plurality of equidistant semi-cylindrical grooves are formed in the two surfaces of each heat storage brick wall 7 in the vertical direction;
the diameter of the semi-cylindrical groove is the diameter of the heat exchange branch pipe 10. Except the outermost heat storage brick wall, the outermost heat storage brick wall only needs to be provided with one inner side.
The semi-cylindrical grooves of the adjacent heat storage brick walls are tightly fit with the heat exchange branch pipes 10 in the middle;
the adjacent heat storage brick walls are arranged in a parallel and compact mode.
The number of the circular slots is equal to the number of the heat exchange branch pipes 10 arranged in each row.
The heat storage brick wall is provided with a plurality of circular cavities 11 with the same size in the horizontal direction;
the round cavity 11 is internally provided with a heating wire 4.
The heat accumulator 2 is heated after the electric heating wire is electrified;
the heat accumulator 2 stores heat and transfers the heat to the heat exchange branch pipe 10 in a heat conduction mode.
The holes of the heat storage brick wall 7 with special shapes are all walls built by heat storage bricks which are custom designed by manufacturers.
The distance between the heat exchange branch pipes 10 is determined by design calculation, and the heat exchange pipe bank 16 is formed by the two heat storage brick wall middle heat exchange branch pipes 10.
A plurality of heat exchange branch pipes 10 are vertically and upwardly connected with an upper heat exchange main pipe 8;
the upper part of the heat exchange tube row 16 is connected with the upper heat exchange main tubes 8, and each upper heat exchange main tube 8 is arranged in parallel in the horizontal direction;
the lower part of the heat exchange branch pipe 10 is connected with a lower heat exchange main pipe 9;
the heat exchange tube bank 16 is connected with the lower heat exchange main tubes 9, each lower heat exchange main tube 9 is arranged in parallel in the horizontal direction, and the upper heat exchange main tubes 8 are vertically connected with the main water supply tube 5.
The lower heat exchange main pipe 9 is vertically connected with the main water return pipe 6;
the main water supply pipe 5 is placed above the solid heat storage boiler, and the main water return pipe 6 is placed below the solid heat storage boiler.
The boiler water system of the invention follows an up-supply and down-return system. Every two heat storage brick walls 7 of the solid heat storage boiler are completely matched with the heat exchange branch pipes 10 in the middle in a direct contact mode, and heat is transferred to the heat exchange branch pipes in a heat conduction and heat transfer mode.
When the solid electric heat storage boiler provided with the heat exchange pipe is constructed, the heat accumulator 2 is firstly installed and constructed, and the heat insulation layer 17 is paved after the heat accumulator is integrally assembled. The insulating layer 17 is generally made of glass wool. Glass wool is laid on the outer periphery of the heat accumulator 2. For blocking heat loss of the heat storage body 2. And further welding the shell 1 of the solid heat storage boiler. The boiler shell 1 is made of a stainless steel plate, and the stainless steel plate is welded to be a cuboid after being surrounded outside the heat preservation box. When the stainless steel plate is cut and measured, a professional tool is used for cutting the water supply pipe, the water return pipe and the preformed hole of the water drain pipe at the corresponding assembly shell position. The size of the prepared hole is the cross-sectional area of the corresponding pipeline. The atmosphere communicating pipe, the thermometer and the pressure gauge are all connected on a main water supply pipe 5 outside the boiler shell.
The heat storage material is specially manufactured in shape, every two heat storage bricks are adhered together to form a cube, the circular hole channel formed in the vertical direction of the heat storage brick wall 7 is a circular hole channel formed in the center of the cube where the two heat storage bricks are adhered together, and the purpose is that each row of heat exchange branch pipes 10 can uniformly absorb heat from the heat storage brick walls 7 on the two sides.
The invention relates to a solid electric heat accumulation boiler provided with a heat exchange pipe, wherein a drain pipe is connected with a reserved drain opening on a main water return pipe, is positioned below the solid heat accumulation boiler and has the same direction as the water incoming direction in the main water return pipe 6. The installation of the drain pipe ensures that the circulating water in the boiler is discharged under the conditions of maintenance or boiler shutdown and the like.
The invention relates to a solid electric heat storage boiler provided with heat exchange tubes, wherein the highest part of a main water supply pipe 5 of the boiler is connected with an atmosphere communicating pipe 12, so that gas generated by vaporization of hot water in a heat exchange system is timely discharged, and the damage caused by overpressure of the boiler is prevented.
The solid electric heat storage boiler provided with the heat exchange tubes is characterized in that a thermometer reserved port 14 and a pressure reserved port 15 are formed in a main water supply pipe 5 of the boiler, so that data of hot water supplied to a user by the boiler can be checked in real time.
The invention is provided with the solid electric heat accumulation boiler of the heat exchange tube, the boiler water system follows the upper supply and lower return system, namely the low-temperature hot water flows into the heat exchange tube bank 16 from the total return pipe 6 below the boiler; and then the heat is obtained from the heat accumulator through the heat exchange branch pipe 10, and high-temperature hot water flows out from the main water supply pipe 5 to provide the requirement of a user.
The density of water can lead to the layering to appear in the vertical direction owing to the difference of temperature, forms upper portion hot water and concentrates lower part cold water and concentrate, so the design of the heat transfer pipeline of upper supply formula of returning down has guaranteed that hot water can in time follow the top and flow out. Meanwhile, in normal operation, bubbles and water vapor are inevitably generated in the heat exchange pipeline, and the gas is discharged out of the boiler through the atmosphere communicating pipe 12 by adopting a mode of supplying the gas from top to bottom and returning the gas to the straight flow. Ensures the safe operation of the equipment
The solid electric heat accumulation boiler provided with the heat exchange tubes saves the occupied area and the occupied space. The traditional solid heat storage boiler adopts air as a medium to transfer heat in a heat storage material, and the air transfers the heat to a heat supply network pipeline through a heat exchanger.
The solid electric heat accumulation boiler provided with the heat exchange tubes reduces the later operation cost and improves the heat exchange efficiency.
The solid electric heat accumulation boiler provided with the heat exchange tubes replaces an air system of a traditional heat accumulation boiler system with the heat exchange tubes and cancels a steam-water heat exchanger. Under the condition that the heat demand of users is large, the mechanical circulation power needs to be increased compared with the traditional heat storage boiler. The specific heat capacity of air is known to be much smaller than that of water, so that the power of the traditional boiler fan is higher than that of a water pump of the novel solid heat storage boiler system designed at this time, and therefore, part of electricity cost is saved.
The traditional heat storage boiler also has a steam-water heat exchange process, the heat exchange efficiency of the steam-water heat exchanger in the process cannot reach one hundred percent, and certain heat loss is caused. When the fan is designed, the flow of air is designed to be a little more, and the fan power is designed to be a little higher so as to meet the requirements of users. Therefore, the invention also improves the heat exchange efficiency.
A large amount of air circulates inside a traditional solid heat storage boiler, the circulating air can contact with an electric heating wire for a long time, the electric heating wire easily breaks down the air under the condition of high voltage, and positive and negative charges formed by air breakdown are migrated around the electric heating wire. Because air is circulated, the short circuit is very easy to occur.
The solid electric heat accumulation boiler provided with the heat exchange tubes cancels heat exchange of circulating air, and reduces the occurrence of short circuit caused by contact of the circulating air and the electric heating wires.
The solid electric heat storage boiler provided with the heat exchange tubes is used all day long in order to prevent a large amount of working media in the heat tubes from absorbing heat and vaporizing due to the fact that heat is stored and heat is not supplied during off-peak electricity. That is, during the off-peak electricity, the power is stored and supplied, and during the peak period and the peak period of the electricity, only the heat is supplied.
The invention relates to a solid electric heat accumulation boiler provided with heat exchange tubes, which controls the heat conduction quantity of a working medium transferred to a heat exchange branch tube from the surface of a heat accumulator to be equal to the heat quantity absorbed by the working medium in a high-temperature state (because of a normal-pressure boiler, the temperature is lower than the saturation temperature under the atmospheric pressure under the same working condition) when the working medium is in a low-temperature state at an inlet to a working medium outlet by designing and calculating the contact length, the number of the contact branch tubes and the row number of the heat accumulator.
The invention discloses a solid electric heat accumulation boiler with heat exchange tubes, which mainly comprises the following calculation steps:
the sizing dimension of the novel solid heat storage boiler is mainly based on the principle of heat conduction and heat transfer, and the heat quantity of hot water in the heat exchange heat pipe is transferred in a heat conduction mode on the assumption that the temperature of the heat accumulator is constant, namely the temperature of the surface of the heat accumulator contacting with the heat exchange branch pipe is constant, namely the heat quantity is equal to the heat quantity absorbed by the temperature of the hot water when the temperature of the hot water rises from the temperature of the total water return pipe to the total water supply pipe.
1. Calculating the contact length of the heat exchange branch pipe in the heat storage brick wall:
heat conduction of each row of heat exchange branch pipes:
heat demand:
wherein A is pi d L m
Let QNeed to＝n·Qd
The contact length of the arranged heat exchange branch pipes in the heat storage brick wall is (simultaneously considering the solid in actual operation)
The height of the heat storage boiler should not exceed two thirds of the height of the boiler room as a limiting value):
in the formula: a- - - -contact area of each row of heat exchange branch pipes and heat storage brick wall, m2；
Lambda- - - -thermal conductivity of the heat exchange branch, W/(m)2·℃)；
-the wall thickness of the heat exchange branch, m;
tw-heat exchange brick wall interface temperature, deg.c;
tpi-average temperature of hot water in the heat exchange branch, c;
c- -specific heat capacity of water, about 4.2X 103J/(kg·℃)；
G- -flow of water in mains water supply pipe, m3/h；
tout-temperature of water leaving the mains supply at, DEG C;
tin-total return pipe inlet water temperature, deg.c;
n- - -the number of rows of heat exchange tube rows;
m < - > -the number of heat exchange branch pipes in the heat exchange pipe row;
d- -pipe diameter of the heat exchange branch pipe, m.
2. Determining the pipe diameter of the heat exchange branch pipe:
and selecting a reasonable number m of the heat exchange branch pipes and a row number n of the heat exchange pipe rows according to the formula to determine the number of the heat exchange branch pipes required in total, and considering that each heat exchange branch pipe should equally divide flow, and each heat exchange branch pipe should be a pipe diameter with the same specification. The proper pipe diameter of the heat exchange branch pipe is further determined according to the total hot water flow.
3. How to determine the pipe diameters of a main water supply pipe and a main water return pipe:
considering that the pipe diameter of the main water supply pipe is selected to be within the corresponding pipe diameter range according to the flow rate limit of the main pipe in the heating design in order to avoid water flow blockage. And the pipe diameter of the main water supply pipe is larger than that of the heat exchange branch pipe, and the pipe diameter of the main water supply pipeline is the same as that of the main water return pipe.
4. Calculating the center distance l between the heat exchange branch pipes in the heat exchange pipe row (the distance between the heat exchange branch pipes is the length of a square formed by two heat storage bricks clamped together in the horizontal plane):
total heat storage QStorage tank·τ＝C·m·Δt
Wherein the mass of the heat accumulator is as follows: where m is ρ V
Deducing the volume of the heat accumulator
Wherein the volume can also be expressed as
The area of the heat storage body in the horizontal direction can be expressed as
l2·m·n＝b·c
Deducing the center distance of the heat exchange branch pipes as follows:
the width of the horizontal plane of the heat accumulator is as follows:
b＝n·l
the length of the horizontal plane of the heat accumulator is as follows:
c＝m·l
in the formula, tau is the continuous heat release time h of the novel solid heat storage boiler;
c- - -specific heat capacity of the heat storage material, J/(kg. DEG C);
rho- -density of the Heat accumulating Material, kg/m3；
Δ t- -the difference between the design temperature of the regenerator and the temperature at which thermal storage begins, in degrees Celsius;
n- - -the number of rows of heat exchange tube rows;
m < - > -the number of heat exchange branch pipes in the heat exchange pipe row;
lambda- - - -thermal conductivity of the heat exchange branch, W/(m)2·℃)；
-the wall thickness of the heat exchange branch, m;
tw-heat exchange brick wall interface temperature, deg.c;
tpi-average temperature of hot water in the heat exchange branch, c;
d- -pipe diameter of the heat exchange branch pipe, m.
5. Hydraulic calculation of the heat exchange system:
the mechanical flow boiler hydrodynamic calculation task is to calculate hydrodynamic characteristics and flow resistance in a boiler heating pipe and determine the pump lift by calculating the flow resistance.
When a single-phase fluid flows in the tube, the total pressure drop can be calculated by:
ΔP＝ΔPmc+ΔPjb±ΔPzw+ΔPjs
wherein, the value is Delta P- - -total pressure drop, Pa;
ΔPmc-the frictional resistance of the single-phase fluid, Pa;
ΔPjb-local resistance of the single-phase fluid, Pa;
ΔPzw-the gravitational pressure drop of the single-phase fluid, Pa; (Positive when the fluid rises and negative when the fluid falls)
ΔPjs-the acceleration resistance, Pa, of the single-phase fluid.
Wherein:
wherein λ — coefficient of frictional resistance;
d- -pipe diameter;
rho W-calculating the mass flow rate of the working medium in the pipe, kg/(m)2·s)；
Zeta in the formulajb-local drag coefficient;
rho W-calculating the mass flow rate of the working medium in the pipe, kg/(m)2·s)；
Wherein Δ h ═ hg-hh
In the formula
Inlet and outlet arithmetic mean density of working medium in tube, kg/m3；
Delta h-the height difference m of the inlet and the outlet of the heat exchange branch pipe;
hg-height of the water supply pipe, m;
hg-height of the return pipe, m.
Accelerated pressure drop Δ P for boiler hydraulic calculation at Low pressurejsThe loss of the boiler is relatively small, so that the acceleration pressure drop is generally ignored in the calculation process, and a certain margin is added to the calculated total pressure drop when the water pump lift is selected, so that the circulating water power of the boiler can be ensured to be normally carried out.
6. Calculating the thickness of the heat-insulating layer:
the heat storage temperature of the heat accumulator is higher and can reach about 800 ℃, so that the heat efficiency is low due to excessive heat loss of the heat accumulator to the outside. So that the whole outer enclosure of the heat accumulator is protected. Therefore, a proper heat accumulator heat insulation material needs to be selected, the heat loss of the heat accumulator is reduced, the service efficiency of the boiler is improved to the maximum extent, meanwhile, the rationality of the external temperature of the boiler is also ensured, and the safety is improved.
Under the condition of allowing heat dissipation loss, the thickness of the heat preservation layer is as follows:
in the formula twTemperature of the thermal mass, DEG C;
tsn-temperature in the boiler room, c;
q- -heat dissipation, W/m2；
h- - -heat insulating layer surface and ambient air convection heat transfer coefficient, W/(m)2·℃)；
Lambda- - -thermal conductivity of the insulation material, W/(m)2·℃)；
When designing boilers with different thermal powers, designing and calculating according to new boiler parameters, and repeating the steps to obtain new design sizes of the boilers.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. A solid electric heat accumulation boiler provided with a heat exchange pipe,
comprises a boiler body, wherein the boiler body comprises a shell (1); a heat-insulating layer is arranged in the furnace shell (1);
the heat insulation layer is internally provided with heat insulation cotton (17);
an insulating base (3) is arranged at the bottom of the boiler body;
a heat accumulator (2) is arranged above the insulating base (3);
the heat accumulator (2) is internally provided with an electric heating wire (4);
the heat accumulator (2) is formed by arranging a plurality of heat accumulation brick walls in parallel;
a heat exchange system is arranged in the heat accumulator (2);
the method is characterized in that:
the connection mode of the heat exchange system is a Z-shaped connection upper and lower axisymmetric structure;
the heat exchange system structure comprises heat exchange branch pipes (10);
the upper ends of the heat exchange branch pipes (10) are communicated with the upper heat exchange main pipe (8);
the lower ends of the heat exchange branch pipes (10) are communicated with the lower heat exchange main pipe (9);
the upper heat exchange main pipe (8) is communicated with a main water supply pipe (5);
the lower heat exchange main pipe (9) is communicated with the main water return pipe (6).
2. A solid electric heat storage boiler provided with heat exchange tubes according to claim 1, wherein: the structure of the wall body built by the heat storage bricks is a heat storage brick wall (7);
a plurality of circular pore channels are arranged between the adjacent heat storage brick walls (7) in the vertical direction;
a heat exchange branch pipe (10) is arranged in the circular pore passage;
the diameter of the circular pore canal is the diameter of the heat exchange branch pipe (10).
3. A solid electric heat storage boiler provided with heat exchange tubes according to claim 1, wherein: a plurality of equidistant semi-cylindrical grooves are formed in the vertical direction on the two surfaces of each heat storage brick wall (7);
the diameter of the semi-cylindrical groove is the diameter of the heat exchange branch pipe (10).
4. A solid electric heat storage boiler provided with heat exchange tubes according to claim 1, wherein: the semi-cylindrical grooves of the adjacent heat storage brick walls are tightly fit with the heat exchange branch pipes (10) in the middle;
the adjacent heat storage brick walls are arranged in a parallel and compact mode.
5. A solid electric heat storage boiler provided with heat exchange tubes according to claim 1, wherein: the heat storage brick wall is provided with a plurality of circular cavities (11) with the same size in the horizontal direction;
the round cavity (11) is internally provided with an electric heating wire (4).
The heat accumulator (2) is heated after the electric heating wire is electrified;
the heat accumulator (2) stores heat and transfers the heat to the heat exchange branch pipe (10) in a heat conduction mode.
6. A solid electric heat storage boiler provided with heat exchange tubes according to claim 1, wherein: the distance between the heat exchange branch pipes (10) is determined by design calculation, and the heat exchange pipe bank (16) is formed by the two heat storage brick wall middle heat exchange branch pipes (10).
7. The solid electric heat storage boiler provided with heat exchange tubes according to claim 6, wherein: a plurality of heat exchange branch pipes (10) are vertically connected with the upper heat exchange main pipe (8);
the upper part of the heat exchange tube row (16) is connected with the upper heat exchange main tube (8), and each upper heat exchange main tube (8) is arranged in parallel in the horizontal direction;
the lower part of the heat exchange branch pipe (10) is connected with a lower heat exchange main pipe (9);
the heat exchange tube bank (16) is connected with the lower heat exchange main tubes (9), each lower heat exchange main tube (9) is arranged in parallel in the horizontal direction, and the upper heat exchange main tubes (8) are vertically connected with the main water supply tube (5).
The lower heat exchange main pipe (9) is vertically connected with the main water return pipe (6);
the main water supply pipe (5) is arranged above the solid heat storage boiler, and the main water return pipe (6) is arranged below the solid heat storage boiler.
The tubes (10) form a heat exchange tube bank (16).
8. A solid electric heat storage boiler provided with heat exchange tubes according to claim 7, wherein: a plurality of heat exchange branch pipes (10) are arranged between the two heat storage brick walls (7) side by side at equal intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010972729.0A CN112066553A (en) | 2020-09-16 | 2020-09-16 | Solid electric heat accumulation boiler provided with heat exchange tubes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010972729.0A CN112066553A (en) | 2020-09-16 | 2020-09-16 | Solid electric heat accumulation boiler provided with heat exchange tubes |
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| CN112066553A true CN112066553A (en) | 2020-12-11 |
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| CN202010972729.0A Pending CN112066553A (en) | 2020-09-16 | 2020-09-16 | Solid electric heat accumulation boiler provided with heat exchange tubes |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205619554U (en) * | 2015-12-22 | 2016-10-05 | 姚长利 | Heat transfer tubular normal pressure hot water boiler and heating system who constitutes thereof |
| CN207716686U (en) * | 2017-12-31 | 2018-08-10 | 青岛科创蓝新能源股份有限公司 | A kind of cold water phase-change energy takes thermal and its system |
| CN110608625A (en) * | 2019-04-30 | 2019-12-24 | 郑家远 | High-temperature solid electric heat accumulator with depth-adjustable heat pipe inserted into heat accumulator |
| CN111207511A (en) * | 2020-01-19 | 2020-05-29 | 河北建筑工程学院 | Efficient heat exchange method for fan-free solid heat storage electric boiler |
| CN111207510A (en) * | 2020-01-19 | 2020-05-29 | 河北建筑工程学院 | No fan formula solid heat accumulation electric boiler |
-
2020
- 2020-09-16 CN CN202010972729.0A patent/CN112066553A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205619554U (en) * | 2015-12-22 | 2016-10-05 | 姚长利 | Heat transfer tubular normal pressure hot water boiler and heating system who constitutes thereof |
| CN207716686U (en) * | 2017-12-31 | 2018-08-10 | 青岛科创蓝新能源股份有限公司 | A kind of cold water phase-change energy takes thermal and its system |
| CN110608625A (en) * | 2019-04-30 | 2019-12-24 | 郑家远 | High-temperature solid electric heat accumulator with depth-adjustable heat pipe inserted into heat accumulator |
| CN111207511A (en) * | 2020-01-19 | 2020-05-29 | 河北建筑工程学院 | Efficient heat exchange method for fan-free solid heat storage electric boiler |
| CN111207510A (en) * | 2020-01-19 | 2020-05-29 | 河北建筑工程学院 | No fan formula solid heat accumulation electric boiler |
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Application publication date: 20201211 |
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