A forced circulation once-through calandria electrically heated high temperature hot water modular boiler

Abstract

The application discloses a forced circulation once-through calandria type electric heating high-temperature hot water module boiler, which comprises a once-through calandria type body assembly, a frequency conversion electric control cabinet assembly, a boiler supporting leg and a connecting positioning pin. The upper header, the lower header and the three-return calandria are connected and communicated by welding to form a series-parallel calandria type heat exchange cavity. The upper end of the calandria is inserted into an electric heating pipe, the right port of the lower header is communicated with a cold water inlet, a filter, a water inlet temperature sensor and a water pump, and a blowdown valve is arranged on the left port of the lower header. A safety valve is arranged on the right port of the upper header, a hot water outlet is welded on the left port of the upper header, a water flow switch and a water outlet temperature sensor are arranged on the hot water outlet, and the once-through calandria type body assembly is formed. The frequency conversion electric control cabinet assembly is arranged on the upper part and positioned by the connecting positioning pin. The boiler supporting leg is arranged on the bottom. The boiler formed by the structure solves the technical defects of a traditional cavity type hot water electric boiler. After the quantitative water pump and the drain trap are replaced and the steam-water separator is added, saturated steam can be output.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating boilers, and in particular to a forced circulation direct current tube-type electric heating high-temperature hot water module boiler. Background Art

[0002] (See Figure 1 Currently, conventional container-type hot water electric boilers have multiple resistance wire heating tubes 02 installed in parallel at both ends of the drum 03. The electric control cabinet 05 and the boiler body 09 are connected by external wires 04 to achieve self-control. This has the following existing technical problems:

[0003] (1) Due to the large water capacity in the drum cavity, the heating speed is slow, which is not suitable for users who need hot water frequently and intermittently. It has high heat loss and high power consumption.

[0004] (2) Users who need high-pressure and high-temperature hot water may face certain safety risks;

[0005] (3) The natural circulation of water in the container-type boiler drum is slow in heat transfer, and scaling of the heating tubes is a common problem of this type of boiler. Therefore, high water quality requirements are required, and periodic cleaning or replacement of the heating tubes is required, which increases the cost of use;

[0006] (4) Boiler steel consumption is about 70% higher, causing steel mills to emit excessive amounts of nitrogen oxides and carbon dioxide;

[0007] (5) Traditional container-type hot water electric boilers do not have the many advantages of DC pipe-type modular boilers. Summary of the Invention

[0008] The present invention aims to utilize a natural physical phenomenon outside the field: the mass-to-weight ratio of calcium carbonate molecules 100 g / mol to magnesium hydroxide molecules 58 g / mol / gravitational separation speed, a flow rate per second ≥ N meters, and the physical phenomenon that molecules are difficult to bind and adhere to. A technical solution formulated based on this physical phenomenon is an electrically heated high-temperature hot water module boiler with a forced circulation direct current pipe arrangement and the ability to remove the container drum, thereby solving the technical problems of the above-mentioned traditional container-type hot water electric boilers.

[0009] The specific technical solution of the present invention is:

[0010] The following technical solution, developed using the physical phenomena outside the field described in the invention content, is a forced circulation DC bar-tube type electric heating high-temperature hot water module boiler, which consists of a DC bar-tube type boiler body assembly, an electric control cabinet assembly, a boiler support leg assembly, and connecting locating pins: the DC bar-tube type boiler body assembly is located on the boiler support leg assembly and fixed with bolts; the variable frequency electric control cabinet assembly is located on the upper part of the DC bar-tube type boiler body assembly, and is connected and locked in various required positions using connecting rod locating pins. This stacking combination method constitutes this boiler.

[0011] The technical features of the straight-flow pipe boiler body assembly are that the thick horizontal water pipes are divided into two parts by a partition plate in the middle two-thirds, forming a lower header cold water inlet chamber and a lower header return water chamber; the upper header is also divided into two parts by a partition plate in the middle two-thirds, forming an upper header return water chamber and an upper header hot water outlet chamber; a plurality of one-return heat exchange pipes, a plurality of two-return heat exchange pipes and a plurality of three-return heat exchange pipes are welded and connected to the lower header cold water inlet chamber, the lower header return water chamber, the upper header return water chamber and the upper header hot water outlet chamber, forming a thin sheet-shaped three-return pipe heat exchange chamber; a plurality of electric resistance wire heating pipes are inserted and installed at the uppermost end of the three-return heat exchange pipes; the one-return heat exchange pipes, the two-return heat exchange pipes and the three-return heat exchange pipes are connected in parallel and then connected in series, forming a straight-flow compound medium water heat exchange path, and a water pump is used for forced circulation heating; and the above structure forms the core structure of the straight-flow pipe boiler body assembly.

[0012] Further, a vertical centrifugal water pump, a filter and an inlet water temperature sensor are connected in series at the right end of the lower header cold water inlet chamber; a blowdown valve is installed at the left end of the lower header return water chamber, facilitating maintenance and blowdown;

[0013] Further, a safety valve is installed at the right end of the upper header return water chamber to ensure safe operation of the system; a water flow detection sensor is installed at the left end of the upper header hot water chamber, and the electric heating pipe is allowed to perform heat exchange work only when the water pump is detected to work and the water flow is detected to be normal; and a water outlet temperature sensor is installed to control the heating water temperature, monitor the safe operation of the system and prevent the electric heating pipe from overheating and burning out;

[0014] Further, the boiler body assembly is connected and positioned with the variable frequency electric control cabinet two assembly through a connecting rod positioning pin, so that the variable frequency electric control cabinet can be locked at different working positions;

[0015] Further, the boiler body assembly is installed in a cabinet type outer packaging shell and filled with multiple layers of asbestos insulation, and the cabinet door is openable for future maintenance;

[0016] The medium water heat exchange path of the forced circulation straight-flow pipe electric heating boiler is: cold water inlet → inlet water temperature sensor → filter → vertical water pump forced circulation pressurization → lower header cold water inlet chamber → one-return heat exchange pipe (electric heating pipe parallel heat exchange) → upper header return water chamber → two-return heat exchange pipe (electric heating pipe parallel heat exchange) → lower header return water chamber → three-return heat exchange pipe (electric heating pipe parallel heat exchange) → upper header hot water outlet chamber → water flow detection sensor → outlet water temperature sensor → hot water outlet, which is a forced circulation straight-flow pipe three-return compound heat exchange path.

[0017] The technical problems and beneficial effects solved by the present application are:

[0018] According to the invention summary, the above technical solution developed using physical phenomena outside the field solves the technical problems of traditional container-type hot water electric boilers and has the following beneficial effects:

[0019] 1. The water heating speed is ≥10 times faster than that of container-type electric boilers. Hot water can be supplied 2 minutes after startup, which is more suitable for users who frequently use hot water. The heat loss is low and the energy saving effect is better.

[0020] 2. The water volume is less than 30 liters and there is no safety hazard.

[0021] 3. The floor space is about 20% of the traditional container-type electric hot water boiler, which can save about 70% of steel and reduce the steel consumption of steel mills by 70%.

[0022] 4. High flow rate flushing heat exchange basically blocks the scaling of the electric heating tube; at the same time, the heating surface of the electric heating tube is 15% of the original heat load, which extends the life of the electric heating tube and reduces the user's cost.

[0023] 5. The unit module combination is produced and assembled separately, with fewer production specifications and reduced manufacturing costs.

[0024] 6. The DC pipe-type modular structure design has a product thickness of ≤170 mm, which occupies a small area and reduces the boiler room construction cost. It is suitable for stacking and transportation, with small volume and light weight, and can reduce freight by about 70%;

[0025] 7. Advantages of unit module combination assembly: three combination modes can be realized, suitable for different users:

[0026] Series connection can provide high-pressure, high-temperature, low-flow hot water: pressure ≤ 4.5MPa, temperature ≤ 120℃, hourly hot water supply ≤ 15 tons;

[0027] Parallel or single use can provide medium pressure, large flow and medium temperature hot water: pressure ≤ 1.5MPa, temperature ≤ 100℃, hourly hot water supply of 15 to 180 tons;

[0028] Parallel and series combined use can provide high-pressure, large-flow, high-temperature hot water; (pressure ≤ 4.5MPa, temperature ≤ 110℃, flow rate ≤ 180 tons per hour.

[0029] 8. The advantage of the variable frequency electric control cabinet with connecting rod positioning is that it can be adjusted and locked in the A / B / C / D positions: locked in the A position is suitable for multi-layer stacking and transportation; the B position can adjust the touch screen angle to adapt to the viewing angle of operators of different heights; locked in the C position is convenient for maintenance and inspection of electrical components; locked in the D position is convenient for maintenance and replacement of electric heating tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Historical Background Schematic diagram of the structure of Example 1 of the product;

[0031] Figure 2 Schematic diagram of the structure of embodiment 1 of the product of the present invention;

[0032] Figure 3 Example 1 of the product of the present invention is a schematic structural diagram of the boiler body assembly;

[0033] Figure 4 Example 1 of the invented product: frequency conversion control cabinet position adjustment diagram;

[0034] Figure 5 Schematic diagram of transport and stacking of Example 1 of the invention application product;

[0035] Figure 6 Schematic diagram of the combined use process of Example 1 of the product of the present invention;

[0036] Figure 7 A schematic structural diagram of Example 2 of the product of the present invention.

[0037] Description of Reference Numerals

[0038] 1-cold water inlet, 2.-water inlet temperature sensor, 3-filter, 4-vertical centrifugal water pump, 5-DC tube boiler body assembly, 6-outer packaging insulation cotton shell, 7-one return heat exchange tube, 8-two return heat exchange tube, 9-safety valve, 10-separator, 11-connecting rod positioning pin, 12-frequency control cabinet assembly, 13-outlet water temperature sensor, 14-water flow detection sensor, 15-hot water outlet, 16-upper header hot water outlet chamber, 17-three return heat exchange tube, 18-resistance wire electric heating Heat pipe, 19-row tube heat exchange cavity, 20-lower header return chamber, 21-drain valve, 22-boiler leg assembly, 23-vertical centrifugal water pump, 24-drain trap, 25-steam-water separator, 26-saturated steam outlet, 28-lower header cold water inlet chamber, 27-upper header return chamber, 01-hot water outlet, 02-heating pipe, 03-container type drum chamber, 04-connecting line, 05-control cabinet, 06-cold water inlet, 07-quantitative water pump, 08-temperature sensor, 09-boiler body. DETAILED DESCRIPTION

[0039] To make the objectives, advantages, and technical features of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The technical features and advantages of the present invention will become more apparent according to the description and claims. It should be noted that the accompanying drawings are in a very simplified form and are only used to conveniently and clearly illustrate the objectives of the embodiments of the present invention.

[0040] Example 1

[0041] (See Figure 2 、 Figure 3(As shown) This embodiment provides a forced circulation DC bar-tube type electric heating high-temperature hot water module boiler, which consists of a DC bar-tube type boiler body component 5, a frequency conversion electric control cabinet component 12, a boiler leg component 22, and a connecting rod positioning pin 11; the DC bar-tube type boiler body component 5 is located on the boiler leg 22 and fixed with a bolt, and the frequency conversion electric control cabinet component 12 is located at the uppermost part of the DC bar-tube type boiler body component 5 and can be positioned and locked in different working positions using the connecting rod positioning pin 11. In this stacking combination, a DC bar-tube type electric heating high-temperature hot water module boiler is formed.

[0042] The direct current tube boiler body assembly 5 includes an upper header hot water outlet chamber 16, an upper header return water chamber 27, a return heat exchange tube 7, a second return heat exchange tube 8, and a third return heat exchange tube 17; a lower header cold water inlet chamber 28, a lower header return water chamber 20, and the lower header cold water inlet chamber 28 and the lower header return water chamber 20 are composed of relatively thick horizontal water pipes, which are separated by a partition 10 in the middle two-thirds; the upper header hot water outlet chamber 16 and the upper header return water chamber 27 are also composed of relatively thick horizontal water pipes, which are separated by a partition 10 in the middle two-thirds; the first return heat exchange tube 7, the second return heat exchange tube 8, and the third return heat exchange tube 17 are respectively provided with a plurality of heat exchange tubes, a plurality of heat exchange tubes, and a plurality of heat exchange tubes. The three-pass heat exchange calandria 17 is welded together with the upper header hot water outlet chamber 16, the upper header return chamber 27, the lower header cold water inlet chamber 28, and the lower header return chamber 20 to form a three-pass calandria heat exchange chamber 19. Resistor heating tubes 18 are inserted into the uppermost ports of the three return heat exchange calandrias. The first-pass heat exchange calandria 7, the second-pass heat exchange calandria 8, and the third-pass heat exchange calandria 17 are connected in parallel, and the three return calandrias are connected in an N-shaped series configuration, forming a composite water direct current heat exchange path. A vertical centrifugal water pump 4 is used for direct current forced circulation heating. This structure forms the core structure of the direct current calandria boiler body assembly 5.

[0043] Specifically, the right port of the cold water inlet chamber 28 of the lower header is equipped with a water inlet 1, a water inlet temperature sensor 2, a filter 3, and a vertical centrifugal water pump 4; the left port of the return water chamber 20 of the lower header is equipped with a drain valve 21 to facilitate draining and cleaning.

[0044] Specifically, a safety valve 9 is installed at the right port of the upper header tank return water chamber to ensure safe operation of the system; a water flow detection sensor 14, an outlet water temperature sensor 13, and a hot water outlet 15 are installed at the left port of the upper header tank hot water outlet chamber. Only when the water pump working water flow is detected at startup can the electric heating pipe 18 be powered on for heating and heat exchange, preventing the electric heating pipe from overheating and damage, thereby ensuring safe operation of the system;

[0045] Specifically, the DC tube boiler body assembly 5 is installed in a cabinet-type outer packaging insulation cotton shell 6, and the cabinet door can be opened for easy maintenance and inspection;

[0046] The medium water path of the above technical features is forced to circulate by a vertical centrifugal water pump 4, and a three-return composite path in which multiple rows of hot water exchange pipes are first connected in parallel and then in series: cold water inlet 1 → water inlet temperature sensor 2 → filter filtration 3 → vertical water pump 4 forced circulation → lower header cold water inlet chamber 28 → first return heat exchange exhaust pipe 7 (electric heating pipe parallel heat exchange) → upper header return water chamber 27 → second return heat exchange exhaust pipe 8 (electric heating pipe parallel heat exchange) → lower header return water chamber 20 → third return heat exchange exhaust pipe 17 (electric heating pipe parallel heat exchange) → upper header hot water outlet chamber 16 → water flow detection sensor 14 → outlet water temperature sensor 13 → hot water outlet 15.

[0047] As described in the content of the invention: the technical solution formulated using natural physical phenomena outside the field solves the technical problems of traditional container-type hot water electric boilers described in the background technology.

[0048] Technical problems solved by the present invention and beneficial effects

[0049] 1. The beneficial effects brought about by the technical features of the above-mentioned direct current tube-type boiler body assembly 5 are:

[0050] 1.1. The water heating speed is ≥10 times faster than that of container-type electric boilers. Hot water can be provided within 2 minutes of startup, making it more suitable for users who frequently use hot water. It also has low heat loss and good energy-saving effect.

[0051] 1.2. The water volume is less than 30 liters;

[0052] 1.3. Save about 70% of steel.

[0053] 1.4. Solve the scaling problem of electric heating tubes; at the same time, the heating surface of the electric heating tubes is 15% of the original heat load, which extends the life of the electric heating tubes and reduces user costs.

[0054] 1.5. (See Figure 5 ) Product thickness ≤ 170 mm, the boiler room occupies less space and the construction cost is low; it is suitable for stacking and transportation, with small volume and light weight, and the freight can be reduced by about 70%.

[0055] 2. (See Figure 6 ) Beneficial effects brought about by the technical features of the unit module assembly combination:

[0056] 2.1. Series connection can provide high-pressure, high-temperature, low-flow hot water: pressure ≤ 4.5MPa, temperature ≤ 120℃, hourly hot water supply ≤ 15 tons;

[0057] 2.2. Parallel or single use can provide medium-pressure, large-flow medium-temperature hot water: pressure ≤ 1.5MPa, temperature ≤ 100℃, hourly hot water supply of 15 to 180 tons;

[0058] 2.3. Parallel and series combined use can provide high-pressure, large-flow, high-temperature hot water; (pressure ≤ 4.5MPa, temperature ≤ 110℃, flow rate ≤ 180 tons per hour.

[0059] 2.4. (See Figure 4 ) The advantage of the variable frequency electric control cabinet 12 combined with the connecting rod positioning pin 11 is that it can be adjusted and locked in the A / B / C / D positions: locked in the A position is suitable for multi-layer stacking and transportation; the B position can adjust the touch screen viewing angle to adapt to people of different heights; locked in the C position is convenient for maintenance and inspection of electrical components; locked in the D position is convenient for maintenance and replacement of electric heating tubes.

[0060] Example 2

[0061] (See Figure 7 ) In the embodiment 1 of the present invention, the vertical centrifugal water pump 4 is replaced with a metering pump 23, and the hot water outlet 15 is connected with a steam-water separator 25 in series. After the steam trap 24 is installed at the bottom, the original inverter closed-loop automatic control in the control cabinet is used to adjust the water intake of the hot water metering pump 23. The hot water outlet 10 can output a steam-water mixture, which is then separated by the steam-water separator 25 to supply saturated steam to the user. The hot water discharged from the steam trap 24 enters the softening water tank for reuse.

[0062] The above description is only a preferred embodiment and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the scope of the boiler technology of the present invention are included in the scope of protection of the present invention.

Claims

1. A forced circulation direct current tube-type electric heating high-temperature hot water module boiler, characterized by: It comprises a DC tube-type boiler body assembly (5), a frequency conversion electric control cabinet assembly (12), a boiler leg assembly (22), and a connecting rod positioning pin (11); The upper header return water chamber (27) and the upper header hot water outlet chamber (16) of the direct current tube-type boiler body assembly (5) are separated and formed by a partition plate (10); the lower header cold water inlet chamber (28) and the lower header return water chamber (20) are also separated and formed by a partition plate (10); the upper header return water chamber (27), the upper header hot water outlet chamber (16), the lower header cold water inlet chamber (28), and the lower header return water chamber (20) are welded and connected with a plurality of heat exchange tubes (7) of the first return, a plurality of heat exchange tubes (8) of the second return, and a plurality of heat exchange tubes (17) of the third return, to form a tube-type heat exchange cavity (19); the tube-type heat exchange cavity A resistance wire electric heating pipe (18) is vertically inserted into the upper port of the body (19); the right port of the cold water inlet chamber (28) of the lower header is connected to the cold water inlet (1), the filter (2), the water inlet temperature sensor (3), and the vertical centrifugal water pump (4); the left port of the return water chamber (20) of the lower header is installed with a drain valve (21); the right port of the return water chamber (27) of the upper header is installed with a safety valve (9); the left port of the hot water outlet chamber (16) of the upper header is welded to the hot water outlet (15), and is equipped with a water flow switch (13) and an outlet water temperature sensor (14), thereby forming a three-pass direct current tube-type boiler body assembly (5); The DC tube-type boiler body assembly (5) is located on the boiler leg assembly (22) and fixed with bolts; the variable frequency electric control cabinet assembly (12) is located on the upper part of the DC tube-type boiler body assembly (5) and is positioned and locked in different required positions A / B / C / D by a connecting rod positioning pin (11); A is the transportation position, B is the working position, C is the maintenance position of the variable frequency electric control cabinet assembly (12), and D is the position for replacing the resistance wire electric heating tube (18); The DC tube-type boiler body assembly (5) is installed in a cabinet-type outer packaging insulation shell (6) with a movable cabinet door.

2. The forced circulation direct current tube-type electric heating high-temperature hot water module boiler according to claim 1 is characterized in that: There are three module combination modes: multiple units in series, multiple units in parallel, and multiple units in series and parallel.

3. The forced circulation direct current tube-type electric heating high-temperature hot water module boiler according to claim 1 is characterized in that: The vertical centrifugal water pump (4) is replaced with a hot water metering pump (23), the steam-water separator (25) is connected to the hot water outlet (15), the lower part is connected to the steam trap (24), and the top is welded to the steam outlet (26).

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