CN212841666U

CN212841666U - Gas-gas heat exchanger for cooling flue gas discharged by garbage pyrolysis equipment

Info

Publication number: CN212841666U
Application number: CN202021286368.6U
Authority: CN
Inventors: 崔炜
Original assignee: Shaanxi Huacheng Industrial Co ltd
Current assignee: Shaanxi Huacheng Industrial Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-03-30
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a carry out refrigerated gas heat exchanger to rubbish pyrolysis equipment exhaust flue gas, including the heat preservation casing, be provided with gas heat exchange assemblies in the heat preservation casing, gas heat exchange assemblies includes tube sheet, tube bank, flue gas air inlet, flue gas outlet, cold air inlet and hot-air gas outlet, and two tube sheet symmetries are installed in the heat preservation casing, and are a plurality of the tube bank both ends all run through the tube sheet, and flue gas air inlet and flue gas outlet are seted up respectively the heat preservation casing both ends, cold air inlet and hot-air gas outlet set up the heat preservation casing lateral wall between two tube sheets, through setting up gas heat exchange assemblies, have improved the energy-conserving effect of heat exchanger greatly.

Description

Gas-gas heat exchanger for cooling flue gas discharged by garbage pyrolysis equipment

Technical Field

The utility model relates to a refuse treatment field specifically is a carry out refrigerated gas heat exchanger to rubbish pyrolysis equipment exhaust flue gas.

Background

The garbage is treated by adopting a pyrolysis gasification principle, and the method has the technical advantages of high thermal efficiency, high temperature of a combustion chamber, low thermal ignition loss rate, small fly ash discharge amount, low dioxin discharge concentration and the like under the condition of no need of any auxiliary fuel, provides a new thought and method for solving the problems of high construction cost and serious secondary pollution of garbage incineration projects in China, and is a new generation of small and medium-scale garbage incineration treatment technology with the greatest development potential at home and abroad at present.

Cracking is the process of heating and decomposing organic matter in oxygen-free or oxygen-deficient condition. The process is a complex chemical reaction process, and comprises the reactions of breaking of macromolecular bonds, isomerization, polymerization of small molecules and the like, and finally various smaller molecules are generated. The organic matter causes molecule decomposition under the condition of oxygen-free heating to generate coke, liquid and gas, and is a leading-edge energy conversion and utilization process.

The cracking process can be divided into slow, conventional, fast and flash processes according to the difference of reaction temperature and heating speed. The slow cracking process has a history of thousands of years, is a carbonization process aiming at generating charcoal, and can obtain 30 percent of coke yield by low-temperature and long-term slow cracking; the gas, liquid and solid products with the same proportion can be prepared by the conventional thermal cracking at the medium temperature lower than 600 ℃ and the medium reaction rate (0.1-1 ℃/s); the rapid thermal cracking is carried out at a heating rate of 10-200 ℃/s approximately and the gas retention time is less than 5 seconds; the reaction conditions for flash thermal cracking are more severe than those for fast thermal cracking, the gas residence time is usually less than 1 second, the temperature rise rate is required to be more than 103 ℃/s, and the product is rapidly cooled at a cooling rate of 102-103 ℃/s.

The garbage is pushed into a cracking area of the cracking furnace by the feeder at a set speed and is uniformly scattered. The garbage entering the furnace can be rapidly heated, dried, cracked and gasified in a humid and anaerobic environment under the action of high-temperature flue gas flow and radiant heat from bottom to top in the furnace body. The cracked residue and carbon deposit residue fall into the lower combustion area for combustion.

And (3) introducing combustible gas generated after the solid waste is cracked and gasified into a secondary combustion chamber, performing secondary air oxygen-supplementing combustion, controlling the temperature in the furnace to be 950-1100 ℃, and enabling the flue gas to stay for 2 seconds in an environment of 850 ℃ and stay for 1 second in an environment of 1100 ℃. After the high-temperature waste gas after burning absorbs heat through the gas-gas heat exchanger and recovers energy, the temperature is reduced to 180 ℃ and then the waste gas enters a tail gas treatment system, and the waste gas is discharged into the atmosphere after reaching the standard after treatment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a carry out refrigerated gas heat exchanger to rubbish pyrolysis equipment exhaust flue gas to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a carry out refrigerated gas heat exchanger to rubbish pyrolysis equipment exhaust flue gas, includes the heat preservation casing, be provided with gas heat exchange assembly in the heat preservation casing, gas heat exchange assembly includes tube sheet, tube bank, flue gas air inlet, flue gas outlet, cold air inlet and hot-air gas outlet, and two tube sheet symmetries are installed in the heat preservation casing, and are a plurality of the tube bank both ends all run through the tube sheet, and flue gas air inlet and flue gas outlet are seted up respectively the heat preservation casing both ends, the heat preservation casing lateral wall between two tube sheets is seted up to cold air inlet and hot-air gas outlet.

As a further aspect of the present invention: the tube bundle is made of 304 stainless steel.

As a further aspect of the present invention: the tube bundles are arranged between the tube plates in an equilateral triangle.

As a further aspect of the present invention: the heat preservation shell is made of an aluminum silicate fiber felt with the thickness of 100 mm and an aluminum plate with the thickness of 0.5 mm.

As a further aspect of the present invention: the flue gas air inlet, the flue gas air outlet, the cold air inlet and the hot air outlet are all provided with flanges.

Compared with the prior art, the beneficial effects of the utility model are that:

by arranging the gas-gas heat exchange assembly, high-temperature flue gas enters the heat-insulating shell from the flue gas inlet, passes through the inner wall of the tube bundle, transfers heat to cold air outside the tube bundle, and is discharged from the flue gas outlet after being cooled; the cold air enters the heat-insulating shell from the pipeline of the cold air inlet, and after passing through the outer wall of the tube bundle, the heat of smoke in the tube is taken away, so that the cold air outside the tube becomes high-temperature hot air, flows out of the heat-insulating shell from the hot air outlet, enters the garbage pyrolysis furnace to support combustion, and the energy-saving effect of the heat exchanger is improved.

Drawings

Fig. 1 is a schematic structural diagram of a gas-gas heat exchanger for cooling flue gas discharged from a waste pyrolysis device.

In the figure: 1-heat preservation shell, 2-tube plate, 3-tube bundle, 4-flue gas inlet, 5-flue gas outlet, 6-cold air inlet and 7-hot air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that, if there is a directional indication (such as up, down, left, right, front, and back) in the embodiment of the present invention, it is only used to explain the relative position relationship between the components, the motion situation, etc. in a certain specific posture, and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if a description of "first", "second", etc. is referred to in the present invention, it is used for descriptive purposes only and not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example 1

Referring to fig. 1, in an embodiment of the present invention, a gas-gas heat exchanger for cooling flue gas discharged from a garbage pyrolysis apparatus includes a heat insulation housing 1, a gas-gas heat exchange assembly is disposed in the heat insulation housing 1, the specific type of the gas-gas heat exchange assembly is not limited, in this embodiment, preferably, the gas-gas heat exchange assembly includes tube plates 2, tube bundles 3, a flue gas inlet 4, a flue gas outlet 5, a cold air inlet 6 and a hot air outlet 7, the two tube plates 2 are symmetrically installed in the heat insulation housing 1, two ends of the tube bundles 3 both penetrate through the tube plates 2, the flue gas inlet 4 and the flue gas outlet 5 are respectively disposed at two ends of the heat insulation housing 1, the cold air inlet 6 and the hot air outlet 7 are disposed at a side wall of the heat insulation housing 1 between the two tube plates 2, high temperature flue gas enters the heat insulation housing 1 from the flue gas inlet 4 and passes, heat is transferred to cold air outside the tube bundle, and cooled flue gas is discharged from a flue gas outlet 5; cold air enters the heat preservation shell 1 from the pipeline of the cold air inlet 6, and after passing through the outer wall of the tube bundle 3, the heat of smoke in the tube is taken away, so that the cold air outside the tube becomes high-temperature hot air, flows out of the heat preservation shell 1 from the hot air outlet 7, and enters the garbage pyrolysis furnace for combustion supporting.

Specifically, the specific material of the tube bundle 3 is not limited, and in the present embodiment, it is preferable that the tube bundle 3 is made of 304 stainless steel.

Specifically, the specific arrangement mode of the tube bundles 3 is not limited, in this embodiment, preferably, the tube bundles 3 are arranged between the tube plates 2 according to an equilateral triangle, the turbulence degree of the fluid outside the tube is high, the heat transfer coefficient is large, and the heat exchanger is efficient and energy-saving.

Specifically, the specific material of the heat preservation shell 1 is not limited, in this embodiment, preferably, the heat preservation shell 1 is made of an aluminum silicate fiber felt with the thickness of 100 mm and an aluminum plate with the thickness of 0.5 mm, the heat preservation performance of the aluminum silicate fiber felt is good, the energy-saving effect of the heat exchanger can be effectively improved, and the heat loss is reduced.

Specifically, the flue gas inlet 4, the flue gas outlet 5, the cold air inlet 6 and the hot air outlet 7 are all provided with flanges.

The utility model discloses a theory of operation is:

high-temperature flue gas enters the heat-insulating shell 1 from the flue gas inlet 4, passes through the inner wall of the tube bundle 3, transfers heat to cold air outside the tube bundle, and the cooled flue gas is discharged from the flue gas outlet 5; cold air enters the heat preservation shell 1 from the pipeline of the cold air inlet 6, and after passing through the outer wall of the tube bundle 3, the heat of smoke in the tube is taken away, so that the cold air outside the tube becomes high-temperature hot air, flows out of the heat preservation shell 1 from the hot air outlet 7, and enters the garbage pyrolysis furnace for combustion supporting.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a carry out refrigerated gas heat exchanger to rubbish pyrolysis equipment exhaust flue gas, includes heat preservation casing (1), its characterized in that, be provided with gas heat exchange assembly in heat preservation casing (1), gas heat exchange assembly includes tube sheet (2), tube bank (3), flue gas air inlet (4), flue gas outlet (5), cold air inlet (6) and hot air gas outlet (7), and two tube sheet (2) symmetries are installed in heat preservation casing (1), and are a plurality of tube bank (3) both ends all run through tube sheet (2), and establish respectively flue gas air inlet (4) and flue gas outlet (5) heat preservation casing (1) both ends, cold air inlet (6) and hot air gas outlet (7) set up heat preservation casing (1) lateral wall between two tube sheet (2).

2. Gas-gas heat exchanger for cooling flue gases discharged from a refuse pyrolysis apparatus according to claim 1, characterized in that the tube bundle (3) is made of 304 stainless steel.

3. A gas-gas heat exchanger for cooling flue gases discharged from a plant for the pyrolysis of waste according to claim 2, characterized in that the tube bundles (3) are arranged in equilateral triangles between the tube sheets (2).

4. A gas-gas heat exchanger for cooling flue gases discharged by a refuse pyrolysis apparatus according to any one of claims 1 to 3, characterized in that the heat-insulating casing (1) is made of a felt of aluminium silicate fibres with a thickness of 100 mm and of an aluminium plate with a thickness of 0.5 mm.

5. The gas-gas heat exchanger for cooling flue gas discharged by a refuse pyrolysis apparatus according to claim 4, wherein the flue gas inlet (4), the flue gas outlet (5), the cold air inlet (6) and the hot air outlet (7) are provided with flanges.