CN104728899B - Hot blast and electric additional hot mixing formula heat exchanger - Google Patents

Abstract

The invention belongs to the technical field of heating systems, and in particular relates to a hot air and electric auxiliary heating hybrid heat exchanger, specifically a fluid heat exchanger combined with hot air and electric auxiliary heating, which is welded and welded in a metal shell. Assemble a heat exchanger composed of components such as hot air ducts, water pipes, and electric heating pipes. Including high-temperature hot air duct, air duct bundle, water liner and electric auxiliary heating tube group. The present invention adopts a fluid heat exchanger combined with hot air and electric auxiliary heating, which can realize the direct heating method of assisting rapid heating with electric power when the waste heat of the regenerative boiler is insufficient. In an environment where the heat is stored in the regenerative furnace during the off-peak period, the auxiliary direct thermal electric heating is used for heating. This hybrid heating method effectively solves the defects of electric heat storage boilers. The supporting production of this kind of heat exchanger creates favorable conditions for the large-scale popularization and application of electric heat storage boilers. The market prospect is good and the economic benefits are considerable.

Description

Hot air and electric auxiliary heating hybrid heat exchanger

technical field

The invention belongs to the technical field of heating systems, and in particular relates to a hot air and electric auxiliary heating hybrid heat exchanger, specifically a fluid heat exchanger combined with hot air and electric auxiliary heating, which is welded and welded in a metal shell. Assemble a heat exchanger composed of components such as hot air ducts, water pipes, and electric heating pipes.

Background technique

At present, the boiler rooms or heat exchange stations used in urban and rural areas, factories, enterprises and institutions in China basically use coal-fired heating steam and water heating boilers, oil heating steam and water heating boilers, electric direct water heating boilers, electric heat storage Several ways such as steam and water heating boilers. Coal-burning and oil-fired heating pollute the environment and resources are increasingly exhausted, and small and medium-sized boilers are gradually banned. The direct heating electric boiler consumes a lot of electricity and has high heating costs, so it cannot be used by ordinary units.

Modern emerging electric heat storage boilers use low-priced electricity to store heat during valley hours, and release heat to produce hot water, hot air, hot oil or steam during peak or normal hours (high-priced or cheap electricity). However, the off-peak power time is limited, generally 7 hours, and the stored thermal energy gradually weakens with the extension of the heat release time (24 hours), which cannot meet the heating demand, and the temperature of the heating system is difficult to meet the standard, so the promotion is slow and the effect is not good.

Contents of the invention

In order to solve the above-mentioned technical problems in the prior art, the present invention provides a hybrid heat exchanger of hot air and electric auxiliary heating. The purpose of the invention is to provide a hybrid heating method, which can effectively solve the flaw problem that the electric heat storage boiler cannot guarantee continuous heating.

The present invention realizes the technical scheme of invention as follows:

Hot air and electric auxiliary heating hybrid heat exchanger, including high-temperature hot air passage, air pipe bundle group, water liner and electric auxiliary heating pipe group; the upper part of the heat exchange body is equipped with an air inlet box, and the lower part of the heat exchange body is equipped with The expansion joint connected to the air outlet box and the heat exchange body divides the heat exchange body into upper and lower parts; the air inlet box is connected with an air inlet port and an air inlet temperature sensor; the heat exchange body The interior includes: water liner, air duct bundle and auxiliary heating wire group; one side of the heat exchange body is connected to the auxiliary heating wire group, and the auxiliary heating wire group penetrates horizontally into the water liner of the heat exchange body; the heat exchange body is connected There is an air pipe bundle; the upper part of the heat exchange body is connected with a safety valve and an outlet pipe, and the outlet pipe is connected with a temperature sensor of the outlet pipe; the lower part of the heat exchange body is connected with a return pipe and a drain valve; the return pipe is connected with a return pipe temperature sensor. The sensor is connected to the return pipe flow meter between the return pipe and the return pipe temperature sensor.

The upper and lower ends of the inner side of the heat exchange body are respectively provided with tube welding plates, and the tube welding plates are provided with a plurality of holes, and the holes on the two tube welding plates are airtightly connected with the two ends of the metal tubes in the air duct bundle The outer side of the metal tube of the air duct bundle, the two tube welding plates and the inner wall of the heat exchange body shell form a sealed water liner.

The middle of the water liner penetrates the auxiliary heating wire group, and the terminal of the auxiliary heating wire group is airtightly connected with the heat exchange body.

The heat exchange body and the air outlet box are connected to the flange of the heat exchange body through the air outlet box; the bottom of the air outlet box is connected to an air outlet, and the air outlet is connected to the frequency conversion fan D; Connected to the air outlet temperature sensor.

There are 8 groups of auxiliary heating wire groups.

Advantageous effect of the present invention is:

Using a fluid heat exchanger combined with hot air and electric auxiliary heating can realize the direct heating method of using electric power to assist rapid heating when the waste heat of the regenerative boiler is insufficient, and it can be used in an environment that requires continuous heating. Next, while using the regenerative furnace to store heat during the valley period, the auxiliary direct heating electric heating is used for heating. This hybrid heating method effectively solves the defects of electric heat storage boilers. The supporting production of this kind of heat exchanger creates favorable conditions for the large-scale popularization and application of electric heat storage boilers. The market prospect is good and the economic benefits are considerable. It is one of the must-choice schemes for power heating projects in the future.

Description of drawings

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

Fig. 2 is a perspective view of the present invention;

Fig. 3 is a structural representation of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a schematic cross-sectional view of Fig. 4;

Fig. 6 is the sectional view of Fig. 3;

Fig. 7 is a schematic diagram of the structure of the auxiliary electric heating wire in the present invention;

Fig. 8 is the left view of Fig. 7;

Fig. 9 is a sectional view of Fig. 8;

Fig. 10 is the right view of Fig. 7;

FIG. 11 is a sectional view of FIG. 4 .

In the figure: air inlet box 1, air inlet port 2, air inlet temperature sensor 3, flange 4, heat exchange body 5, expansion joint 6, air outlet box 7, air outlet box and heat exchange body flange 8. Air outlet port 9, auxiliary heating wire group 10, outlet pipe 11, outlet pipe temperature sensor 12, return pipe flowmeter 13, return pipe temperature sensor 14, air outlet temperature sensor 15, return pipe 16, safety valve 17, Sewage valve 18, air pipe bundle 19, water liner 20, pipe welding plate 21; regenerative boiler regenerator A, heat exchanger B, frequency conversion fan D, upper air passage hot air F1, lower air passage hot air F2, upper heating heat Circulating water S1 of the water system, circulating water S2 of the heating and hot water system.

detailed description

The invention is a hot air and electric auxiliary heating hybrid heat exchanger. Specifically, the four components of the high-temperature hot air duct, the air tube bundle, the water liner and the electric auxiliary heating tube group are designed to be interactively connected in a metal heat exchanger shell, as shown in Figures 1-11.

The hot air enters the air inlet opening 2, and the air inlet opening 2 is connected to the air inlet box 1, and meanwhile, the air inlet opening 2 is also connected to the air inlet temperature sensor 3. The air inlet channel box 1 is connected to the upper part of the heat exchange body 5 through the flange 4; the middle part of the heat exchange body 5 is welded with an expansion joint 6 to adjust the thermal expansion of the heat exchange body. The upper part of the heat exchange body 5 is connected with a water outlet pipe 11 , and a water outlet pipe temperature sensor 12 is connected with the water outlet pipe 11 . A safety valve 17 is also connected to the upper part of the heat exchange body 5 . The lower part of the heat exchange body 5 is connected with a return pipe 16 , the return pipe 16 is connected with a return pipe temperature sensor 14 , and a return pipe flowmeter 13 is connected between the return pipe mouth and the return pipe temperature sensor 14 . The lower part of the heat exchange body 5 is also connected to a drain valve 18 . The heat exchange body 5 includes: a water liner, an air duct bundle and an auxiliary heating wire group.

The heat exchange body 5 and the air outlet box 7 are connected with the heat exchange body flange 8 through the air outlet box; An air outlet temperature sensor 15 is also connected to the air outlet opening 9 .

One side of the heat exchange body 5 is connected with an auxiliary heating wire group 10 , and the auxiliary heating wire group 10 penetrates laterally into the water liner 20 of the heat exchange body 5 .

The internal structure of the heat exchange body 5 is: the upper and lower ends of the inner side of the heat exchange body 5 are respectively welded with tube welding plates 21, and there are more than 300 holes on the surface of the tube welding plates 21, and the holes on the two tube welding plates 21 are connected with the air duct road. All about 300 metal tubes in beam 19 are welded on the outer edges of both ends, and need to be airtight, pressure-bearing, and water-tight. The inner wall of the metal tube of the air duct bundle 19 passes hot air; the outer side of the metal tube of the air duct bundle 19 forms an airtight water liner 20 with two tube welding plates 21 and the inner wall of the heat exchange body 5 shell.

In the middle of the heat exchange body 5 water liner 20, there is a space for installing the electric heating wire group, and 8 groups of auxiliary heating wire groups 10 can be penetrated. Hot air and auxiliary electric heating are enabled at the same time, and can also be used alternately.

The working principle of the present invention is as follows:

As shown in Figure 1, heat storage boiler heat storage body A, heat exchanger B, frequency conversion fan D, hot air in the upper air passage F1 and hot air in the lower air passage F2, circulating water S1 and S2 of the heating hot water system. Use the off-peak period to store heat in the heat storage body A of the heat storage boiler to above 500°C. At this time, when the heat storage body A of the heat storage boiler is storing heat, the heat exchanger B is heated with auxiliary electricity. When heating, start the frequency conversion fan D to blow air between the heat storage body A of the heat storage boiler and the heat exchanger B. The circulating water S1 of the water system and the circulating water S2 of the heating hot water system perform heat exchange to realize heating.

For the heat exchanger, it is: the water is heated by high-temperature hot air to generate hot water or steam, and the energy conversion is realized by the heat exchanger. Hundreds of stainless steel tubes or red copper tubes are arranged vertically in the inner tank of the heat exchanger as the air duct bundle 19, which are connected and fixed in the shell with tube welding plates, and the outside of the air duct bundle 19 is connected and sealed with the shell to form a water inner tank. Transversely insert 8 groups of electric heating tubes and auxiliary heating wire groups 10 from the middle of the heat exchanger again, and wear them in the water bladder as auxiliary heaters. First, low-temperature water flows in from the return pipe 16 to fill the water inner tank, and hot water flows out from the water outlet pipe 11 to enter the heating system pipe. The heat of the electric heat storage boiler is circulated in the closed air duct by the frequency conversion fan, and the high-temperature hot air is sent to the air intake duct on the top of the heat exchanger, and enters the hundreds of metal tubes in the air duct bundle 19, and is circulated by the water liner 20. After absorbing heat, it takes away the heat, and the cooled hot air returns to the electric heat storage boiler through the bottom return air duct. And through the frequency modulation to control the size of the hot air volume to adjust the outlet water temperature.

Claims (1)

1. Hot air and electric auxiliary heating hybrid heat exchanger, which is characterized by: including high temperature hot air duct, air pipe bundle group, water liner and electric auxiliary heating pipe group; The upper part of the heat exchange body (5) is provided with an air inlet channel box (1), the lower part of the heat exchange body (5) is provided with an air outlet channel box (7), and the expansion joint (6) connected to the middle part of the heat exchange body (5) ) dividing the heat exchange body (5) into upper and lower parts; the air inlet box (1) is connected with an air inlet port (2) and an air inlet temperature sensor (3); The interior of the heat exchange body (5) includes: a water liner (20), an air duct bundle (19) and an auxiliary heating wire group (10); one side of the heat exchange body (5) is connected to the auxiliary heating wire group (10), the auxiliary heating wire group (10) penetrates laterally into the water liner (20) of the heat exchange body (5); the heat exchange body (5) is connected with an air duct bundle (19); The upper part of the heat exchange body (5) is connected with a safety valve (17) and an outlet pipe (11), and the outlet pipe (11) is connected with an outlet pipe temperature sensor (12); the lower part of the heat exchange body (5) is connected with a return pipe ( 16) and drain valve (18); wherein the return pipe (16) is connected with a return pipe temperature sensor (14), and the return pipe flowmeter (13) is connected between the return pipe (16) and the return pipe temperature sensor (14); The upper and lower ends of the inner side of the heat exchange body (5) are respectively provided with tube welding plates (21), and a plurality of holes are arranged on the tube welding plates (21). The two ends of the metal tubes in the tube bundle (19) are airtightly connected; the outer side of the metal tube of the air tube bundle (19), two tube welding plates (21) and the inner wall of the heat exchange body (5) shell form an airtight water liner (20); The auxiliary heating wire group (10) penetrates through the middle of the water liner (20), and the terminal of the auxiliary heating wire group (10) is airtightly connected with the heat exchange body (5); The heat exchange body (5) and the air outlet box (7) are connected with the heat exchange body flange (8) through the air outlet box; the bottom of the air outlet box (7) is connected with an air outlet (9 ), the air outlet port (9) is connected to the frequency conversion fan D; the air outlet port (9) is also connected with an air outlet temperature sensor (15); There are 8 groups of auxiliary heating wire groups (10).