CN107676829A - A kind of Waste Heat Recovery integrates side fish stove - Google Patents

Abstract

The invention discloses a waste heat recovery integrated small frying stove, which comprises a stove body and a waste gas treatment device. There are exhaust gas control baffles in between. Exhaust gas treatment device includes exhaust gas exhaust pipeline and tap water heating pipeline, tap water heating pipeline includes tap water inlet pipe, low temperature heat exchanger, medium temperature heat exchanger, high temperature heat exchanger and hot water outlet pipe, exhaust gas exhaust pipeline Including high-temperature exhaust gas channel, intermediate connection box, medium-low temperature heat exchange box and forced exhaust fan. The high-temperature exhaust gas channel runs through the high-temperature heat exchanger. On the medium and low temperature heat exchange box. The invention ensures that the waste gas is discharged through the waste gas pipe through the setting of the waste gas control baffle; through the setting of the waste gas exhaust pipe and the tap water heating pipe, the utilization rate of waste heat is improved and thermal pollution is reduced.

Description

A waste heat recovery integrated small frying stove

technical field

The invention relates to the field of waste heat recovery, in particular to a waste heat recovery integrated small cooking stove.

Background technique

According to statistics, the existing gas stoves in the catering industry have serious heat loss and empty burning phenomenon is common. The average thermal efficiency is only 20%, and the heat loss is as high as 80%, resulting in great energy waste. The so-called thermal efficiency of the gas stove, in layman's terms, is the effective utilization rate of the gas heat energy during the use of the gas stove. As can be seen from the thermal efficiency of gas cookers, household gas cookers generally have a low utilization rate of gas heat energy, and about 40% to 50% of gas heat energy is wasted in use. The combustion method of the commercial gas stoves currently used in the market still adopts the traditional positive pressure open combustion method. During the gas combustion process, the combustion flame and high-temperature flue gas are directly leaked out, resulting in the formation of a large number of high-temperature incomplete combustion after the gas is burned. Carbon gas is directly discharged into the surrounding environment, so that only a small part of the heat generated by gas combustion is utilized by the pot, and the heat utilization efficiency is extremely low. Moreover, air pollution and noise pollution will be brought due to the release of incompletely burned gas and the surrounding environment. Therefore, no matter whether it is a domestic gas cooker or a commercial gas cooker, it is facing a serious problem of energy waste during use.

The following patent documents can be found after searching the prior art of gas stove heat recovery:

The applicant Hefei Shunchang Distributed Energy Comprehensive Application Technology Co., Ltd. discloses a series of commercial gas boiler flue gas waste heat recovery devices, including recovery devices, hot water supply systems, non-powered recovery systems, etc., including the shell, and the inside of the shell There are water inlet main pipe and water outlet main pipe installed vertically. The water inlet main pipe is installed at the right end of the shell, and the water outlet main pipe is installed at the left end of the shell. Manual valves are installed on the water pipe and the water outlet pipe, square finned tubes are installed between the water inlet main pipe and the water outlet main pipe, and fins are installed on the square finned pipes. However, its structural configuration is complicated, it is inconvenient to control during use, and its efficiency is not high, so it cannot maximize the effective use of waste heat energy.

Applicant Jin Yuange discloses a waste heat utilization device for commercial gas stoves, which is composed of a water-jacketed furnace, a water storage tank, a furnace water inlet pipe, a furnace outlet water pipe, a water outlet valve, a float valve, and a cold water inlet. It is characterized by a water-jacketed furnace. The furnace wall of the water-jacketed furnace is a hollow structure, and the internal water storage forms a water-jacketed structure, so as to realize the circulation heating of the water in the water tank and effectively collect the heat lost to the furnace by gas combustion. . However, it only brings heat from the periphery of the gas stove to the water tank through heat exchange. Once part of the heat is concentrated, the heat exchange efficiency will inevitably decrease, which is very inconvenient in actual use.

The applicant Nanjing Jingong Kitchenware Equipment Co., Ltd. discloses a commercial gas stove that realizes waste heat recovery of flue gas, including a stove, a waste heat recovery device for flue gas, a gas branch connected to the stove, and a waste heat recovery device for the flue gas The air branch circuit and flue gas branch circuit where the recovery device is connected with the stove. Among them, the flue gas branch and the air branch are cross-connected with each other through the flue gas waste heat recovery device, and the flue gas and the air exchange heat to reduce the heat loss of the exhaust gas while increasing the air temperature, so as to realize the preheating of the air entering the gas stove for combustion, thereby Improve the combustion efficiency of gas, and the energy saving effect is remarkable. The flue gas waste heat recovery device is a plate heat exchanger made of stainless steel, the pressure drop is less than 20Pa, the surface adopts bumps to increase the disturbance and heat exchange area, the structure is compact, and the modular design can be installed in the exhaust pipe of the gas stove. It utilizes the heat exchange between flue gas and air to utilize the heat into the intake air to heat the intake air and improve the thermal efficiency. However, this kind of gas heat exchange has high requirements on the heat exchanger, and the actual heat exchange effect is not that good. not ideal.

Therefore, in the face of these problems, it is necessary to improve the existing technology to realize a system that can maximize the recovery and reuse of waste heat from gas stoves. It can adjust heat recovery according to actual needs and improve the efficiency of gas stoves. Energy-saving performance not only enables people to directly benefit from saving gas, but also has important practical significance for the effective use of gas resources and the protection of environmental resources.

Contents of the invention

The invention specifically provides a waste heat recovery integrated small frying stove, which solves the problems in the prior art that the waste heat recovery efficiency of gas stove waste gas is not high, resulting in waste of resources and environmental pollution.

The technical scheme that the present invention adopts is as follows:

A waste heat recovery integrated small frying stove, including a stove body and a waste gas treatment device, characterized in that: the stove body includes a stove top and a stove top, the stove top is arranged above the stove head, and the stove top is connected to the waste gas treatment device, An exhaust gas control baffle is provided between the stove and the exhaust gas treatment device. The waste gas treatment device includes a waste gas exhaust pipeline and a tap water heating pipeline, and the tap water heating pipeline includes a tap water inlet pipe, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, and a hot water outlet in sequence. Water pipes, the exhaust gas exhaust pipeline includes a high-temperature exhaust gas channel, an intermediate connection box, a medium-low temperature heat exchange box, and a forced-exhaust suction fan connected in sequence, the high-temperature exhaust gas channel runs through a high-temperature heat exchanger, and the medium-temperature heat exchanger is set In the medium and low temperature heat exchange box, the low temperature heat exchanger is wound on the medium and low temperature heat exchange box.

In the above scheme, the high-temperature heat exchange box is a rectangular parallelepiped base, and the high-temperature exhaust gas channel is a plurality of sets of evenly arranged rectangular tubes, and the rectangular tubes run through the high-temperature heat exchange box to connect the furnace and the intermediate connection box.

In the above solution, the medium and low temperature heat exchange box is a hollow copper box, and the copper box is connected to the intermediate connection box and the forced exhaust suction fan.

In the above scheme, the medium-temperature heat exchanger is a copper tube with copper fins, and the copper tube is arranged in a trapezoidal shape in the medium-low temperature heat exchange box.

In the above solution, the low-temperature heat exchanger is a copper tube wound on the medium-low temperature heat exchange box from top to bottom.

In the above solution, a connecting pipe is provided between the medium-temperature heat exchanger and the high-temperature heat exchanger, and a medium-temperature water outlet is opened on the connecting pipe. . Both the hot water outlet pipe and the tap water inlet pipe are equipped with electromagnetic valves.

In the above solution, the hot water outlet pipe and the tap water inlet pipe are both provided with solenoid valves.

In the above solution, a temperature probe is provided at the connection between the hot water outlet pipe and the high-temperature heat exchanger.

In the above scheme, the exhaust gas cooling and purification chamber is arranged inside the forced exhaust suction fan.

In the above solution, a controller is also included, and the temperature probe, the forced-exhaust suction fan, and the solenoid valve are all electrically connected to the controller.

The using method of the present invention is:

1. Replace the diversion valve to block the natural exhaust channel, so that the exhaust gas can only be discharged through the exhaust gas exhaust pipe, and at the same time open the solenoid valve on the tap water inlet pipe, tap water begins to enter the whole device;

2. Turn on the forced exhaust fan, and the whole device starts to work;

3. The tap water passes through the low-temperature heat exchanger, the medium-temperature heat exchanger and the high-temperature heat exchanger in turn to exchange heat with the waste gas;

4. When the temperature probe detects that the water temperature reaches the set temperature, the solenoid valve of the hot water outlet pipe opens to take out the hot water.

5. When the water temperature is lower than the set temperature, the solenoid valve of the hot water outlet pipe is closed, and the solenoid valve of the tap water inlet pipe is opened to continue heat exchange.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

1. The present invention ensures that the waste gas must be discharged through the waste gas pipe through the setting of the waste gas control baffle, and at the same time, it can block the waste gas from being discharged when it is not needed, and makes good use of the waste heat in the waste gas; through the waste gas exhaust pipe and tap water heating pipe The setting of the exhaust gas makes the exhaust gas direction opposite to the heating direction of tap water. The heat in the exhaust gas is fully utilized through three different heat exchange pipelines, which greatly improves the utilization rate of waste heat. At the same time, the exhaust gas is cooled and discharged before being discharged. Reduced thermal pollution.

2. In the present invention, the high-temperature heat exchanger and the high-temperature waste gas channel are arranged in the middle of the rectangular matrix to pass through the pipe, and the heat in the waste gas is exchanged for the first time, and the contact area is increased through the arrangement of multiple pipes, which improves the heat transfer. High efficiency, made of stainless steel, achieves the effect of durability and cost saving.

3. In the present invention, the medium and low temperature heat exchange box is made of copper, which has the highest thermal conductivity, so that the heat exchange efficiency is higher and the heat exchange is more thorough.

4. The present invention sets the medium-temperature heat exchanger as a copper tube with copper fins, the copper tube is medium-temperature tap water, the copper tube is surrounded by medium-temperature exhaust gas, and copper fins are arranged outside the copper tube to increase the distance between the copper tube and the exhaust gas. At the same time, the copper tube is arranged in a trapezoidal shape, which further increases the contact area, making the heat exchange between the medium-temperature water and the medium-temperature exhaust gas more thorough, and greatly improving the heat exchange efficiency

5. In the present invention, the low-temperature heat exchanger is set as a copper tube wrapped outside the copper box, and the residual waste heat on the box wall is also heat-exchanged, so that the heat exchange is more thorough and heat pollution is reduced at the same time.

6. The present invention can well cope with various needs by providing a medium-temperature water outlet on the connecting pipe, and can take water with a suitable water temperature, making the whole device more convenient and faster.

7. In the present invention, through the setting of the electromagnetic valve, the work of adding water and draining water is performed when necessary, which makes it more convenient and quicker.

8. The present invention ensures that the temperature of the discharged water reaches the set temperature through the setting of the temperature probe, which makes the use more convenient.

9. The present invention makes the waste gas meet the discharge standard when it is discharged through the setting of the waste gas cooling purification room, and avoids pollution.

10. The present invention realizes the automatic control of the whole device through the setting of the controller, saving manpower and material resources.

Description of drawings

The invention will be illustrated by way of example with reference to the accompanying drawings, in which:

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

The names of parts corresponding to the reference signs are as follows: 1-stove body, 2-exhaust gas treatment device, 11-stove top 11, 12-burner head, 13-exhaust gas control baffle, 21-tap water inlet pipe, 22-low temperature Heat exchanger, 23-medium temperature heat exchanger, 24-high temperature heat exchanger, 25-hot water outlet pipe, 26-high temperature exhaust gas channel, 27-intermediate connection box, 28-medium and low temperature heat exchange box, 29-strong exhaust Type suction fan, 251-temperature probe, 271-connecting pipe, 272-medium temperature water outlet, 291-exhaust gas cooling purification room.

detailed description

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Example 1

As shown in Figure 1, a waste heat recovery integrated small frying stove includes a stove body 1 and a waste gas treatment device 2, and is characterized in that: the stove body 1 includes a stove 11 and a burner 12, and the stove 11 is arranged on the stove Above the head 12 , the stove 11 is connected to the exhaust gas treatment device 2 , and an exhaust gas control baffle 13 is arranged between the stove 11 and the exhaust gas treatment device 2 . The waste gas treatment device 2 includes a waste gas exhaust pipeline and a tap water heating pipeline, and the tap water heating pipeline includes a tap water inlet pipe 21, a low-temperature heat exchanger 22, a medium-temperature heat exchanger 23, and a high-temperature heat exchanger connected in sequence. 24 and hot water outlet pipe 25, the waste gas exhaust pipeline includes a high temperature waste gas channel 26, an intermediate connection box 27, a medium and low temperature heat exchange box 28 and a forced exhaust fan 29 connected in sequence, and the high temperature waste gas channel 26 runs through The high temperature heat exchanger 24 and the medium temperature heat exchanger 23 are arranged in the medium and low temperature heat exchange box 28 , and the low temperature heat exchanger 22 is wound on the medium and low temperature heat exchange box 28 .

Example 2

On the basis of Example 1, the high-temperature heat exchange box 24 is a rectangular parallelepiped substrate, and the high-temperature exhaust gas channel 26 is a plurality of sets of uniformly arranged rectangular tubes, and the rectangular tubes run through the high-temperature heat exchange box 24 to communicate with the furnace 12 and the middle Connection box 27.

Example 3

On the basis of Embodiment 1 or 2, the medium and low temperature heat exchange box 28 is a hollow copper box, and the copper box communicates with the intermediate connection box 27 and the forced-exhaust suction fan 29 .

Example 4

Based on the above embodiments, the medium-temperature heat exchanger 23 is a copper tube with copper fins, and the copper tubes are arranged in a trapezoidal shape in the medium-low temperature heat exchange box 28 .

Example 5

Based on the above embodiments, the low temperature heat exchanger 22 is a copper tube wound on the medium and low temperature heat exchange box 28 from top to bottom.

Example 6

On the basis of the above embodiments, a connecting pipe 271 is provided between the medium-temperature heat exchanger 23 and the high-temperature heat exchanger 24, and a medium-temperature water outlet 272 is opened on the connecting pipe 271. 6. The hot water Electromagnetic valves are arranged on the water outlet pipe and the tap water inlet pipe.

Example 7

On the basis of the above embodiments, the hot water outlet pipe 25 and the tap water inlet pipe 21 are both provided with electromagnetic valves.

Example 8

Based on the above embodiments, a temperature probe 241 is provided at the connection between the hot water outlet pipe 25 and the high temperature heat exchanger 24 .

Example 9

On the basis of the above-mentioned embodiments, a waste gas cooling and cleaning chamber 291 is provided inside the forced-exhaust suction fan 29 .

Example 10

On the basis of the above-mentioned embodiments, the waste heat recovery integrated small frying stove further includes a controller, and the temperature probe 241, the forced-exhaust suction fan 29, and the solenoid valve are all electrically connected to the controller.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.

Claims (10)

1. A waste heat recovery integrated small frying stove, comprising a stove body (1) and a waste gas treatment device (2), characterized in that: the stove body (1) includes a stove (11) and a burner (12), the The cooktop (11) is arranged above the burner head (12), the cooktop (11) is connected to the exhaust gas treatment device (2), and an exhaust gas control block is arranged between the cooktop (11) and the exhaust gas treatment device (2). plate (13); the waste gas treatment device (2) includes a waste gas exhaust pipeline and a tap water heating pipeline, and the tap water heating pipeline includes a tap water inlet pipe (21), a low-temperature heat exchanger (22), A medium-temperature heat exchanger (23), a high-temperature heat exchanger (24) and a hot water outlet pipe (25), the exhaust gas exhaust pipeline includes a high-temperature exhaust gas passage (26), an intermediate connection box (27), A medium and low temperature heat exchange box (28) and a forced exhaust fan (29), the high temperature exhaust gas channel (26) runs through the high temperature heat exchanger (24), and the medium temperature heat exchanger (23) is located in the medium and low temperature heat exchange box In (28), the low temperature heat exchanger (22) is wound on the medium and low temperature heat exchange box (28). 2. A waste heat recovery integrated small frying stove according to claim 1, characterized in that: the high-temperature heat exchange box (24) is a rectangular parallelepiped substrate, and the high-temperature waste gas passage (26) is a plurality of groups of evenly arranged rectangular The rectangular tube runs through the high-temperature heat exchange box (24) and communicates with the furnace (12) and the intermediate connection box (27). 3. A waste heat recovery integrated small frying stove according to claim 1 or 2, characterized in that: the medium and low temperature heat exchange box (28) is a hollow copper box, and the copper box is connected to the middle connection box (27) And strong exhaust fan (29). 4. A waste heat recovery integrated small frying stove according to claim 3, characterized in that: the medium-temperature heat exchanger (23) is a copper tube with copper fins, and the copper tube is arranged in a trapezoid Inside the exchange box (28). 5. A waste heat recovery integrated small frying stove according to claim 3, characterized in that: the low temperature heat exchanger (22) is a copper tube wound on the medium and low temperature heat exchange box (28) from top to bottom. 6. A waste heat recovery integrated small frying stove according to claim 1, characterized in that: a connecting pipe (271) is provided between the medium-temperature heat exchanger (23) and the high-temperature heat exchanger (24), and the The connecting pipe (271) is provided with a medium temperature water outlet (272). 7. The waste heat recovery integrated small frying stove according to claim 1, characterized in that: the hot water outlet pipe (25) and the tap water inlet pipe (21) are both provided with solenoid valves. 8. The waste heat recovery integrated small frying stove according to claim 1, characterized in that: a temperature probe (241) is provided at the junction of the hot water outlet pipe (25) and the high-temperature heat exchanger (24). 9. A waste heat recovery integrated small frying stove according to claim 1, 7 or 8, characterized in that: a waste gas cooling and purification chamber (291) is provided in the forced exhaust suction fan (29). 10. A waste heat recovery integrated small frying stove according to claim 9, characterized in that it also includes a controller, the temperature probe (241), the forced exhaust fan (29), and the solenoid valve are all electrically connected to the controller. connect.