CN201014751Y - Waste heat recovery gas water heater for waste water - Google Patents

Abstract

The utility model discloses a waste water waste heat recovery gas water heater, which comprises a water heater body composed of a burner, an ignition device, a control system, a main heat exchanger and an outer casing, a cold water inlet pipeline, and a hot water outlet pipeline, a combustion chamber, The main heat exchangers are all located in a closed room, and the closed room is connected with a flue gas passage and an outlet. It is characterized in that another exhaust gas waste heat recovery heat exchanger is arranged in the flue gas passage above the main heat exchanger. To form a condensing gas water heater, there is also a waste heat recovery heat exchanger in the cold water inlet pipeline. The waste heat recovery heat exchanger is arranged below the hot water outlet of the gas water heater. Connect the exhaust gas waste heat recovery heat exchanger, and then connect the gas main heat exchanger. The utility model has the advantages of simple and reasonable structure, high heat utilization efficiency and the like.

Description

Waste heat recovery gas water heater for waste water

technical field

The utility model relates to a water heater, in particular to a water heater which recovers waste heat from waste water and improves heat utilization efficiency.

Background technique

During the use of traditional water heaters, the temperature of the high-temperature flue gas generated by gas water heaters is still high after being exchanged by the heat exchanger, which can reach 150-200°C. It is calculated that more than 10% of the heat will be discharged with the flue gas. On the one hand, the heat of the used waste hot water is also wasted and not better utilized. In order to reduce the exhaust gas temperature and recover the heat in the flue gas, people have invented a condensing gas water heater, but how to recover and utilize the heat of the waste hot water has not yet been resolved.

Utility model content

The purpose of this utility model is to solve the above-mentioned deficiencies, and provide a waste water waste heat recovery gas water heater which can recycle waste water waste heat.

The technical solution that the utility model takes in order to achieve the above object is as follows:

A waste water waste heat recovery gas water heater, including a water heater body consisting of a burner, an ignition device, a control system, a main heat exchanger and an outer casing, a cold water inlet pipeline, and a hot water outlet pipeline, the combustion chamber and the main heat exchanger are both It is located in a closed room, and the closed room is connected with a flue gas passage and an outlet. It is characterized in that another exhaust gas waste heat recovery heat exchanger is arranged in the flue gas passage above the main heat exchanger to form a condensing gas water heater. , there is also a waste heat recovery heat exchanger in the cold water inlet pipeline, the waste heat recovery heat exchanger is set under the hot water outlet of the gas water heater, and the cold water inlet pipeline is connected to the waste gas waste heat recovery heat exchanger after passing through the waste water waste heat recovery heat exchanger exchanger, and then connected to the gas main heat exchanger.

The surface of the exhaust gas waste heat recovery heat exchanger is made of stainless steel or aluminum alloy, and the surface is provided with a protective layer to prevent acid corrosion.

A condensed water collection device is arranged below the exhaust gas waste heat recovery heat exchanger, and the condensed water collection device is connected with a condensed water drain pipe.

The heat exchanger for waste heat recovery from waste water is installed in a support frame, and a support plate with water leakage holes is arranged on the support frame, and a waste water outlet is provided at the lower part to form a waste heat recovery heat exchange device for waste water.

The beneficial effect that the utility model can reach by adopting above-mentioned technical solution is:

1. Adopt the conventional combustion form, and set the heat exchanger above the combustion chamber, so that the flame burns upwards, which is conducive to the stable control of the flame;

2. Install a condensed water collection device under the layered heat exchanger, which can effectively protect the heat exchanger from being corroded by acidic condensed water;

3. The cold water passes through the exhaust gas waste heat heat exchanger and the waste water waste heat recovery heat exchange device in turn, and exchanges heat with the hot flue gas and hot water countercurrently twice, fully absorbs the heat of the waste gas and the heat of the waste hot water generated by the combustion of gas, and enters after preheating Water heater, thus greatly improving the heat utilization efficiency;

4. The utility model adopts the method of forced supply and exhaust of smoke by fan, which is safe and reliable.

Description of drawings

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

Fig. 2 is the use connection schematic diagram of the utility model;

Fig. 3 is a schematic diagram of the appearance structure of the wastewater waste heat recovery device of the present invention;

Fig. 4 is a schematic diagram of the heat transfer principle of the wastewater waste heat recovery device of the present invention.

Explanation of reference numerals: shell 1, water valve 2, air valve 3, fan 4, control system 5, combustion chamber 6, ignition device 7, burner 8, heat exchanger 9, waste water waste heat recovery heat exchanger 10, water inlet pipe 11, drainage pipe 12, support plate 13.

Detailed ways

As shown in Figure 1, the waste water waste heat recovery gas water heater includes a casing 1 and a water valve 2 installed in the casing 1, a gas valve 3, a fan 4, a control system 5, a combustion chamber 6, an ignition device 7, a burner 8 and The heat exchanger 9, the ignition device 7 is an ignition electrode, the gas valve 3 is a proportional valve, the burner 8 is arranged on the inner bottom of the combustion chamber 6, the fan 4 communicates with the bottom opening of the combustion chamber 6, and the gas valve 3 The gas and air required for combustion are provided by the blower fan 4. The heat exchanger 9 is also arranged in the combustion chamber 6 and above the burner 8. The heat exchanger 9 is composed of two heat exchangers arranged in layers. The heat exchangers are connected through water pipes, and a condensed water collection device and a condensed water drainage pipe 14 are installed between the two heat exchangers. The gas valve 3 is connected with the burner 8 through the gas pipe, and the water valve 2 is connected with the heat exchanger 9 through the water inlet pipe 11. The water inlet of the upper heat exchanger is connected, the water outlet of the lower heat exchanger of the heat exchanger 9 is connected with the drain pipe 12, and the surface of the heat exchanger 9 is provided with a protective layer to prevent acidic corrosion of condensed water, and the water inlet pipe 11 is connected with a waste heat recovery heat exchanger 10. The hot water outlet of the drain pipe 12 is located above the waste heat recovery heat exchange device. The waste water waste heat recovery heat exchange device is mainly composed of a heat exchanger 10 and a support plate 13. Thermal principle, polyester plastic is used as the support frame around, the support plate 13 is set above the heat exchanger, and there is a water leakage hole on it, the waste water after use flows into the waste heat recovery heat exchanger 10 of waste water, and passes through the heat exchange device The clean cold water undergoes heat exchange, and the preheated cold water officially enters the water heater to be heated, which effectively utilizes the heat. The cold water inside and the waste water outside are separated separately, only heat convection occurs, and there is no mutual penetration, which has no effect on use; The surface of the waste heat recovery heat exchanger 10 is an anti-rust layer, and the lower part is provided with a waste water outlet, and the excess waste water can flow away after heat exchange; the waste gas waste heat recovery heat exchanger 10 is provided with a condensed water collection device. The ignition device 7 is arranged on the casing 1 next to the burner 8, and is used to provide a fire source to the burner 8. The water valve 2, the gas valve 3 and the fan 4 are electrically connected to the control system 5. When the ignition device 7 discharges and burns According to the set water temperature, the control system 5 adjusts the intake ratio of the gas volume and the air volume of the gas valve 3 to ensure that the combustion can be more complete. Condensate drain connected.

When in use, the clean cold water first enters the wastewater waste heat recovery device, exchanges heat with the used hot wastewater, enters the water heater after preheating, and enters the upper heat exchanger through the water valve 2 through the water inlet pipe 11, and the cold water is exchanged in the upper layer. After absorbing the remaining temperature of the flue gas in the heat exchanger 9, it enters the lower heat exchanger through the water pipe. The water is fully heated in the lower heat exchanger and then discharged from the drain pipe 12. The discharged waste hot water can also pass through the waste heat of waste water. The recovery device is reused to provide heat to the cold water in the water inlet pipe, and so on. When the heat exchanger on the upper layer is working, it will cause the condensation of water vapor and produce a certain amount of condensed water, and the condensed water flowing down will be collected and purified by the condensed water collecting device. After secondary heat reuse of waste gas and waste water, the thermal efficiency of the water heater can be much higher than 150%.

Claims (4)

1. A waste water waste heat recovery gas water heater, including a water heater main body composed of a burner, an ignition device, a control system, a main heat exchanger and an outer shell, a cold water inlet pipeline, and a hot water outlet pipeline, a combustion chamber, and a main heat exchanger The devices are all located in a closed room, and the closed room is connected with a flue gas passage and an outlet. It is characterized in that another exhaust gas waste heat recovery heat exchanger is arranged in the flue gas passage above the main heat exchanger to form a condensing type For gas water heaters, there is also a waste heat recovery heat exchanger in the cold water inlet pipeline. The waste heat recovery heat exchanger is arranged below the hot water outlet of the gas water heater. The heat exchanger connection, and then the gas main heat exchanger. 2. A waste water waste heat recovery gas water heater according to claim 1, characterized in that: the surface of the waste gas waste heat recovery heat exchanger is provided with an acid corrosion protection layer. 3. A waste water waste heat recovery gas water heater according to claim 1 or 2, characterized in that: a condensed water collection device is installed under the waste gas waste heat recovery heat exchanger, and the condensed water collection device is connected to a condensed water drain pipe . 4. A waste water waste heat recovery gas water heater according to claim 1 or 2, characterized in that: the surface of the waste water waste heat recovery heat exchanger is an anti-rust layer, and a support frame and belt are arranged outside the waste water waste heat recovery heat exchanger. The support plate with water leakage holes is provided with a waste water outlet at the lower part to form a waste heat recovery heat exchange device for waste water.

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