CN214581032U

CN214581032U - Stabilize regenerative combustion system of stove pressure formula

Info

Publication number: CN214581032U
Application number: CN202120607165.0U
Authority: CN
Inventors: 任峻岭; 严丰
Original assignee: Orient Thermo Technology Shanghai Co ltd
Current assignee: Orient Thermo Technology Shanghai Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-11-02
Anticipated expiration: 2031-03-25

Abstract

The application discloses stabilize regenerative combustion system of stove pressure formula, it includes: the device comprises a hearth, a main burner, a first heat storage tank, a second heat storage tank, a heat exchanger and a natural gas source; the hearth is respectively communicated with the first heat storage tank, the second heat storage tank and the main burner; the main burner is communicated with a natural gas source through a pipeline; the heat exchanger is provided with a heat exchange smoke inlet pipe, a heat exchange smoke exhaust pipe, a heat exchange air inlet pipe and a heat exchange air outlet pipe; the heat exchanger is communicated with the hearth through the heat exchange smoke inlet pipe and communicated with the main burner through the heat exchange air outlet pipe; a fan is arranged at the pipe orifice of the heat exchange air inlet pipe; a four-way reversing valve is arranged in the hearth; the four-way reversing valve is communicated with the air blower, the draught fan, the first heat storage box and the second heat storage box through pipelines respectively. Compared with the prior art, this scheme can further improve combustion efficiency to lower energy consumption, when switching gas flow direction, can keep the pressure stability in the stove simultaneously, reduce the flue gas and leak.

Description

Stabilize regenerative combustion system of stove pressure formula

Technical Field

The utility model belongs to the technical field of waste heat recovery, relate to a heat accumulation combustion system of stable stove pressure formula particularly.

Background

Coal is the most abundant and least expensive fossil energy, and has a great role in human economic activities for a long time. The fossil energy will emit a large amount of hot gas during the combustion process, and how to effectively recover the hot gas and avoid the direct emission into the atmosphere is an important subject of the technicians in the field. Existing combustion systems with waste heat recovery include regenerative combustion devices and heat exchanger devices. The heat storage combustion equipment is used for introducing high-temperature flue gas into a heat storage box, exchanging heat with a heat accumulator and then discharging the heat accumulator; and air is introduced into the other thermal storage image, is heated by the thermal storage image and then enters the combustion area to participate in the combustion reaction. After one period, the gas flow direction is switched to carry out the next round of heat storage. The simple heat exchanger device utilizes various heat exchange devices to transfer the heat of the flue gas to air, and then the high-temperature air is put into a combustion area to participate in combustion reaction. The problems of the scheme are as follows: the heat storage device is only suitable for the high-temperature section above 800K to work, when the temperature is lower than 800K, the viscosity and the humidity of the smoke are higher, dust is attached to the heat storage body, the heat storage body is difficult to clean, and the heat transfer efficiency is reduced; due to the limitation of the existing material technology, the heat exchanger cannot be used in a high-temperature environment. In addition, the existing heat accumulation combustion system also has the problems of increased pressure in the furnace, aggravated leakage of smoke at the furnace door and reduced waste heat recovery efficiency when the reversing valve switches the gas flowing direction. Therefore, how to design a new type of stable furnace pressure type regenerative combustion system, which can overcome the above problems of the existing similar products, is the direction of the research needed by the technicians in this field.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a stable furnace pressure type regenerative combustion system. The combustion efficiency can be further improved, so that lower energy consumption is realized, and meanwhile, when the flowing direction of gas is switched, the pressure in the furnace can be kept stable, and the smoke leakage is reduced.

A regenerative combustion system of a stabilized furnace pressure type, comprising: the device comprises a hearth, a main burner, a first heat storage tank, a second heat storage tank, a heat exchanger and a natural gas source; the hearth is respectively communicated with the first heat storage tank, the second heat storage tank and the main burner; the main burner is communicated with a natural gas source through a pipeline; a heat exchange pipeline and a ventilation pipeline are arranged in the heat exchanger; two ends of the heat exchange pipeline are respectively communicated with the heat exchange smoke inlet pipe and the heat exchange smoke exhaust pipe; the heat exchange air inlet pipe and the heat exchange air outlet pipe at two ends of the air exchange pipeline are communicated; the heat exchanger is communicated with the hearth through the heat exchange smoke inlet pipe and communicated with the main burner through the heat exchange air outlet pipe; a fan is arranged at the pipe orifice of the heat exchange air inlet pipe, which is far away from one end of the heat exchanger; a four-way reversing valve is arranged in the hearth; the four-way reversing valve is communicated with the air blower, the draught fan, the first heat storage box and the second heat storage box through pipelines respectively.

By adopting the technical scheme: the heat exchanger is introduced on the basis of the prior art, so that the flue gas in the hearth enters the heat exchanger for heat exchange, the temperature of the air blown into the hearth is improved, and the combustion efficiency in the hearth is improved. Meanwhile, the temperature of the discharged flue gas is reduced, the waste heat recovery of the flue gas is realized, the pressure value in the furnace when the flow direction of the gas is switched is also reduced, the condition of flue gas leakage is reduced, and the environment protection is facilitated.

Preferably, in the above stable furnace pressure type regenerative combustion system: and a flue gas filter is also arranged on the pipeline of the heat exchange smoke inlet pipe.

By adopting the technical scheme: the smoke filter is additionally arranged to filter smoke entering the heat exchanger from the hearth, so that the phenomenon that large particle components in the smoke are accumulated in the pipeline to cause pipeline blockage after long-term use is avoided. The heat exchange efficiency of the heat exchanger is ensured, and the service life of the equipment is prolonged.

More preferably, in the stable furnace pressure type regenerative combustion system: the device also comprises a first auxiliary burner and a second auxiliary burner; the first auxiliary burner is arranged at the interface of the first heat storage box and the hearth; the second auxiliary burner is arranged at the interface of the second heat storage box and the hearth; and the first auxiliary burner and the second auxiliary burner are respectively communicated with a natural gas source through pipelines.

By adopting the technical scheme: and the first heat storage box and the second heat storage box are used as heat exchange places of air required by combustion supporting and high-temperature flue gas after combustion. Through increasing supplementary combustor, the cooperation main burner has realized hierarchical burning and local low oxygen burning in furnace, and hierarchical burning effect lies in more abundant fuel burnout, improves combustion efficiency, and local low oxygen burning effect lies in improving the factor condition that nitrogen oxide generated, reduces nitrogen oxide's emission.

Compared with the prior art, the scheme has the advantages of simple structure and easiness in implementation. The combustion efficiency can be further improved, so that lower energy consumption is realized, and meanwhile, when the flowing direction of gas is switched, the pressure in the furnace can be kept stable, and the smoke leakage is reduced.

Drawings

The present application will now be described in further detail with reference to the following detailed description and accompanying drawings:

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic structural view of example 2;

fig. 3 is a schematic structural view of embodiment 3.

The correspondence between each reference numeral and the part name is as follows:

1. a hearth; 2. a blower; 3. a four-way reversing valve; 4. an induced draft fan; 5. a flue gas filter; 6. a heat exchanger; 7. a main burner; 8. a natural gas source; 9. a fan; 11. a first heat storage tank; 12. a second heat storage tank; 61. a heat exchange smoke inlet pipe; 62. a heat exchange smoke exhaust pipe; 63. a heat exchange air inlet pipe; 64. a heat exchange air outlet pipe; 71. a first auxiliary burner; 72. a second auxiliary burner.

Detailed Description

In order to more clearly illustrate the technical solutions of the present application, the following will be further described with reference to various embodiments.

As shown in fig. 1, example 1:

a regenerative combustion system of a stabilized furnace pressure type, comprising: the heat-storage type natural gas burner comprises a hearth 1, a main burner 7, a first heat-storage box 11, a second heat-storage box 12, a heat exchanger 6 and a natural gas source 8.

The hearth 1 is respectively communicated with a first heat storage tank 11, a second heat storage tank 12 and a main burner 7; the main burner 7 is communicated with a natural gas source 8 through a pipeline; a four-way reversing valve 3 is arranged in the hearth 1; the four-way reversing valve 3 is respectively communicated with the air blower 2, the draught fan 4, the first heat storage box 11 and the second heat storage box 12 through pipelines. A heat exchange pipeline and a ventilation pipeline are arranged in the heat exchanger 6; two ends of the heat exchange pipeline are respectively communicated with the heat exchange smoke inlet pipe 61 and the heat exchange smoke exhaust pipe 62; the heat exchange air inlet pipe 63 and the heat exchange air outlet pipe 64 at two ends of the air exchange pipeline are communicated; the heat exchanger 6 is communicated with the hearth 1 through a heat exchange smoke inlet pipe 61 and communicated with the main burner 7 through a heat exchange air outlet pipe 64; a fan 9 is arranged at the pipe orifice of the heat exchange air inlet pipe 63 far away from one end of the heat exchanger 6;

in practice, the working process is as follows: the blower 9 is started to blow external low-temperature air into the heat exchanger 6 through the heat exchange air inlet pipe 63. The natural gas source 8 continuously supplies gas to realize combustion in the main burner hearth 1. The four-way reversing valve 3 switches the gas flow direction once every a period of time, so that the first heat storage tank 11 and the second heat storage tank 12 perform exhaust and intake exchange. Specifically, the alternating working processes of the first heat storage tank and the second heat storage tank are as follows: the air blower 2 blows air into the first heat storage box 11 through the four-way valve 3, after the air exchanges heat with the heat accumulator inside the first heat storage box 11, the heat accumulator inside the first heat storage box 11 is cooled, the air is heated and enters the hearth 1, flue gas enters the second heat storage box 12 from the inside of the hearth 1, after the flue gas exchanges heat with the heat accumulator inside the second heat storage box 12, the heat accumulator is heated, and meanwhile, the flue gas is cooled and then is sucked away by the draught fan 4 through the four-way reversing valve 3; the valve plate direction is switched after the four-way reversing valve 3 works for a period of time, the air flow direction flow is opposite to that of the air flow, the air blower 2 blows air into the second heat storage box 12 through the four-way valve 3, the air is subjected to heat exchange with the heat accumulator inside the second heat storage box 12, the heat accumulator inside the second heat storage box 12 is cooled, the air is heated and enters the hearth 1, the flue gas enters the first heat storage box 11 from the inside of the hearth, the flue gas is subjected to heat exchange with the heat accumulator inside the first heat storage box 11, the heat accumulator is heated, the flue gas is cooled, and then the flue gas is sucked away by the draught fan 4 through the four-way reversing valve 3. In the process, the first auxiliary burner 71 and the second auxiliary burner 72 are opened when the air on the corresponding side enters the hearth 1, and are closed at the rest of the time. Therefore, the heat exchange of the low-temperature air and the high-temperature flue gas for enough time is ensured, and the purpose that the high-temperature air participates in combustion is achieved. In the process, the low-temperature flue gas is discharged to a subsequent flue gas treatment device through the induced draft fan 4; meanwhile, high-temperature flue gas in the hearth enters a heat exchange pipeline of the heat exchanger 6 and exchanges heat with low-temperature air in a ventilation pipeline of the heat exchanger 6, so that air flow blown into the hearth 1 in the ventilation pipeline is heated, high-temperature air can be continuously and stably supplied to the main burner 7 for combustion reaction, the waste heat recovery efficiency is improved, and the problem of unstable pressure in the hearth 10 caused by the reversing of the four-way reversing valve 3 is solved.

As shown in fig. 2, example 2:

compared with the embodiment 1, the embodiment 2 further adds a smoke filter 5. The flue gas filter 5 is installed on the pipeline of the heat exchange smoke inlet pipe 61.

In practice, the flue gas entering the heat exchanger 6 from the hearth 1 is filtered by the additionally arranged flue gas filter 5, so that the pipeline blockage caused by accumulation of large particle components in the flue gas in the pipeline after long-term use is avoided.

As shown in fig. 3, example 3:

compared with the embodiment 2, the embodiment 3 further adds a first auxiliary burner 71 and a second auxiliary burner 72; the first auxiliary burner 71 is installed at the interface of the first heat storage tank 11 and the hearth 1; the second auxiliary burner 72 is installed at the interface of the second heat storage tank 12 and the hearth 1; the first auxiliary burner 71 and the second auxiliary burner 72 are respectively communicated with the natural gas source 8 through pipelines.

In practice, the first heat storage tank 71 and the second heat storage tank 72 are used as heat exchange places of air required for combustion supporting and high-temperature flue gas after combustion. Through increasing two supplementary burners, the cooperation main burner 7 has realized hierarchical burning and local low oxygen burning in furnace 1, and hierarchical burning effect lies in improving combustion efficiency, and local low oxygen burning effect lies in improving the factor condition that nitrogen oxide generated, reduces nitrogen oxide's emission.

The above description is only for the specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are intended to be covered by the scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A regenerative combustion system of a stabilized furnace pressure type, comprising: the device comprises a hearth (1), a main burner (7), a first heat storage box (11), a second heat storage box (12) and a natural gas source (8);

the hearth (1) is respectively communicated with the first heat storage tank (11), the second heat storage tank (12) and the main burner (7); the main burner (7) is communicated with a natural gas source (8) through a pipeline;

it is characterized by also comprising: a heat exchanger (6); a heat exchange pipeline and a ventilation pipeline are arranged in the heat exchanger (6); two ends of the heat exchange pipeline are respectively communicated with the heat exchange smoke inlet pipe (61) and the heat exchange smoke exhaust pipe (62); the heat exchange air inlet pipe (63) and the heat exchange air outlet pipe (64) at the two ends of the air exchange pipeline are communicated; the heat exchanger (6) is communicated with the hearth (1) through a heat exchange smoke inlet pipe (61) and communicated with the main burner (7) through a heat exchange air outlet pipe (64); a fan (9) is arranged at the pipe orifice of one end of the heat exchange air inlet pipe (63) far away from the heat exchanger (6);

a four-way reversing valve (3) is arranged in the hearth (1); the four-way reversing valve (3) is communicated with the air blower (2), the draught fan (4), the first heat storage box (11) and the second heat storage box (12) through pipelines respectively.

2. The stabilized furnace pressure type regenerative combustion system according to claim 1, wherein: and a flue gas filter (5) is also arranged on the pipeline of the heat exchange smoke inlet pipe (61).

3. The furnace pressure stabilizing regenerative combustion system according to claim 2, further comprising: further comprising a first supplementary burner (71) and a second supplementary burner (72); the first auxiliary burner (71) is installed at the interface of the first heat storage tank (11) and the hearth (1); the second auxiliary burner (72) is installed at the interface of the second heat storage tank (12) and the hearth (1); the first auxiliary burner (71) and the second auxiliary burner (72) are respectively communicated with a natural gas source (8) through pipelines.