CN205351773U - Phase transition heat transfer hot water unit - Google Patents

Abstract

A phase-change hot water unit, which includes a boiler body with a furnace inside. The furnace door of the boiler body is equipped with a burner that can inject combustion flames into the furnace. The boiler body is also equipped with a heat medium A vacuum chamber for water, in which a plurality of flue gas heat exchange pipes with one end connected to the furnace and the other end connected to the discharge chimney are connected in series; Finally, a built-in heat exchanger with saturated steam for heat exchange is formed. In the cold water heat exchange channel of the built-in heat exchanger, the hot water outlet at one end is connected to the hot water outlet pipe, and the cold water inlet at the other end is connected to the cold water inlet pipe; An external flue gas heat exchanger is also arranged between the cold water inlet of the built-in heat exchanger and the cold water inlet pipe, and the flue gas heat exchange pipe connected from the built-in heat exchanger is connected to the external flue gas heat exchanger. Heater, and connect the flue gas pipe from the flue gas ventilator to the peripheral exhaust chimney; it has the characteristics of reasonable structure, corrosion resistance, greatly improved heat transfer coefficient, lower exhaust gas temperature, and high thermal efficiency.

Description

Phase change hot water unit

technical field

The utility model relates to a phase-change heating water heating unit for providing hot water for daily life, which belongs to the technical field of boiler hot water.

Background technique

In the traditional drum-type hot water boiler, the water in the boiler is connected to the external connection through the forced circulation of the water pump. When starting up, the heat inside the boiler will always be taken away by the outside, and the temperature of the boiler water in the boiler will be lower than that of the smoke for a long time. The dew point temperature of water vapor in the gas, the flue gas will condense in the furnace body (including the furnace and smoke pipe) for a long time, making the boiler prone to corrosion;

Traditional drum-type hot water boilers circulate water through water pumps, which is prone to hydraulic imbalance; since traditional drum-type boilers basically adopt a three-pass structure, the temperature and pressure of the flue gas and boiler water in the third pass are relatively small , The heat transfer coefficient is relatively small, which is a waste of steel.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a phase-change hot water heating unit with reasonable structure, corrosion resistance, greatly improved heat transfer coefficient, lower exhaust gas temperature, and high thermal efficiency.

The purpose of this utility model is achieved through the following technical proposal, a phase-change hot water unit, which includes a boiler body with a furnace inside, and the furnace door of the boiler body is equipped with a device that can spray and burn into the furnace. Flame burner, the boiler body is also provided with a vacuum chamber filled with heat medium water, and a plurality of flue gas heat exchange pipes with one end connected to the furnace and the other end connected to the discharge chimney are connected in series in the vacuum chamber; The upper part of the boiler body is provided with a built-in heat exchanger for heat exchange with the heat medium water in the vacuum chamber to form saturated steam for heat exchange. Out of the pipe, the cold water inlet at the other end is connected to the cold water inlet pipe.

As a preference: an external flue gas heat exchanger is also arranged between the cold water inlet of the built-in heat exchanger and the cold water inlet pipe, and the flue gas heat exchange exhaust pipe connected from the built-in heat exchanger is connected to the externally connected A flue gas heat exchanger, and connect the flue gas pipe from the flue gas exchanger to the exhaust chimney of the peripheral equipment; the external flue gas heat exchanger is provided with a water flow heat exchange coil, and the water flow heat exchange The outlet pipe of the coil is connected to the cold water inlet of the built-in heat exchanger through the cold water inlet pipe, and the water inlet of the water flow heat exchange coil is connected to the water supply source.

As a preference: the lower part of the vacuum chamber in the boiler body is horizontally connected with a plurality of flue gas heat exchange exhaust pipes, and the flue gas inlet port of the flue gas heat exchange exhaust pipes is located at the bottom of the furnace; the built-in heat exchanger It is horizontally arranged in the upper part of the vacuum chamber on the upper part of the boiler body, and a vacuum pump, a vacuum gauge and a safety valve communicating with the vacuum chamber are arranged on the upper part of the built-in heat exchanger.

Compared with the prior art, the utility model has the following characteristics:

One is that it uses the saturated steam formed by the vaporization of the heat medium to exchange heat with the external system, which has a high heat transfer coefficient, no oxygen corrosion, flue gas condensation corrosion, and hydraulic balance imbalance;

The second is to replace the third return flue pipe with a tube heat exchanger, which has a large heat transfer coefficient;

The third is that the return water temperature is below the condensation temperature, which can realize true condensation;

Fourth, the third return flue pipe is discarded, the overall size of the furnace body is reduced, and the requirements for transportation are lowered.

The utility model has the characteristics of reasonable structure, corrosion resistance, greatly improved heat transfer coefficient, lower exhaust gas temperature, high thermal efficiency and the like.

Description of drawings

Fig. 1 is a structural representation of the utility model.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings: As shown in Figure 1, a phase-change hot water unit described in the utility model includes a boiler body 2 with a furnace 1 inside, and the boiler body The furnace door of 2 is equipped with a burner 3 that can inject combustion flames into the furnace 1. The burner 3 includes an existing fuel oil or gas engine, and a vacuum chamber 5 filled with heat medium water 4 is also arranged inside the boiler body 2. , in the vacuum cavity 5, a plurality of flue gas heat exchange pipes 7 with one end connected to the furnace 1 and the other end connected to the discharge chimney 6 are connected in series; After heating, a built-in heat exchanger 8 that forms saturated steam for heat exchange, the cold water heat exchange channel 9 of the built-in heat exchanger 8, the hot water outlet at one end is connected to the hot water outlet pipe 10, and the cold water inlet at the other end is connected to the Cold water access pipe 11.

As shown in the figure, an external flue gas heat exchanger 12 is also arranged between the cold water inlet of the built-in heat exchanger 8 and the cold water inlet pipe 11, and the flue gas heat exchange exhaust pipe connected from the built-in heat exchanger 8 7 is connected to the external flue gas heat exchanger 12, and the flue gas pipe is connected to the external exhaust chimney 6 after connecting the flue gas exchanger 12; the external flue gas heat exchanger 12 is set There is a water flow heat exchange coil 13, and the outlet pipe of the water flow heat exchange coil 13 is connected to the cold water inlet of the built-in heat exchanger 8 through the cold water inlet pipe 11, and the water inlet pipe of the water flow heat exchange coil 13 is connected to the water supply source.

The lower part of the vacuum chamber 5 in the boiler body 2 described in the utility model is horizontally connected with a plurality of flue gas heat exchange pipes 7 in series, and the flue gas inlet ports of the flue gas heat exchange pipes 7 are located at the inner bottom of the furnace 1; The built-in heat exchanger 8 is horizontally arranged in the upper part of the vacuum chamber 5 on the upper part of the boiler body 2, and a vacuum pump 14, a vacuum gauge 15 and a safety valve connected to the vacuum chamber 5 are arranged on the upper part of the built-in heat exchanger 8 16.

The phase-change hot water boiler described in the utility model is processed by vacuumizing the boiler. When the flame burns in the furnace, the heat medium water inside the boiler absorbs the heat released by the flame combustion, and the temperature of the heat medium water will be shorter. Within a certain period of time, it rises and forms saturated steam with a certain pressure. The external heat exchanges heat with the saturated steam formed by the evaporation of heat medium water through the built-in heat exchanger, and takes away the heat in the boiler for external use. This heat exchange method can make The temperature of the heat medium water in the furnace rises to above 60°C in a short period of time, which can avoid condensation inside the furnace and effectively solve the problem of boiler condensation corrosion.

The phase-change hot water boiler adopts the structure of two returns + waste heat heater. The third return smoke pipe of the traditional chamber-fired boiler is discarded and replaced by waste heat, which simplifies the processing technology. The heat exchange tube improves energy efficiency and saves steel consumption, and can realize true condensation when the return water temperature is lower than a certain temperature; the heat medium water of the phase-change hot water boiler always exists inside the boiler and does not participate in external connection The cycle solves the oxygen corrosion problem of the boiler; the phase change hot water boiler uses the phase change of saturated steam to exchange heat with the external water, which greatly improves the heat transfer coefficient.

Claims (3)

1. A phase-change hot water unit, which includes a boiler body with a furnace inside, a burner that can spray combustion flames into the furnace is arranged outside the furnace door of the boiler body, and a filling device is also arranged inside the boiler body. The vacuum chamber of the heat medium water is connected in series with a plurality of flue gas heat exchange pipes with one end connected to the furnace and the other end connected to the chimney; the upper part of the boiler body is provided with a A built-in heat exchanger that forms saturated steam for heat exchange after the water is heated. The cold water heat exchange channel of the built-in heat exchanger has a hot water outlet at one end connected to the hot water outlet pipe, and a cold water inlet at the other end connected to the cold water inlet. Tube. 2. The phase-change heating and hot water unit according to claim 1, characterized in that an external flue gas heat exchanger is arranged between the cold water inlet of the built-in heat exchanger and the cold water inlet pipe to replace it from the inside. The flue gas heat exchange exhaust pipe connected to the heater is connected to the external flue gas heat exchanger, and the flue gas pipe is connected to the external exhaust chimney after the flue gas exchanger is connected to the external flue gas heat exchanger; The air heat exchanger is provided with a water flow heat exchange coil, and the outlet pipe of the water flow heat exchange coil is connected to the cold water inlet of the built-in heat exchanger through the cold water inlet pipe, and the water inlet pipe of the water flow heat exchange coil is connected to water supply source. 3. The phase-change heating and water heating unit according to claim 1 or 2, characterized in that a plurality of flue gas heat exchange pipes are connected in series in the lower part of the vacuum chamber in the boiler body, and the flue gas heat exchange The flue gas inlet port of the row pipe is located at the inner bottom of the furnace; the built-in heat exchanger is arranged horizontally on the upper part of the vacuum chamber on the upper part of the boiler body, and a vacuum pump and a vacuum pump connected to the vacuum chamber are arranged on the upper part of the built-in heat exchanger. meter and safety valve.