CN218120713U - Dustproof split type gas phase change heat exchanger - Google Patents

Abstract

The utility model provides a prevent split type coal gas phase transition heat exchanger of deposition type, including flue gas heat exchanger tube bank and coal gas heat exchanger tube bank, wherein coal gas heat exchanger tube bank is higher than flue gas heat exchanger tube bank, the upper end of flue gas heat exchanger tube bank through steam tedge with coal gas heat exchanger tube bank's upper end is connected, the lower extreme of flue gas heat exchanger tube bank pass through the condensate back flow with coal gas heat exchanger tube bank's lower extreme is connected, coal gas heat exchanger tube level of coal gas heat exchanger tube bank is arranged, the vertical arrangement of fin on the heat exchange tube. The utility model discloses coal gas heat exchanger tube bank's fin heat exchange tube axial direction sets up to the horizontal direction for vertical direction is personally submitted to heat exchange tube fin surface, and the unable deposit of dust has effectively solved the problem of coal gas heat exchanger tube bank deposition on the fin surface.

Description

Dustproof split type gas phase change heat exchanger

Technical Field

The utility model relates to a steel industry waste heat recovery device especially relates to a prevent split type coal gas phase transition heat exchanger of deposition type.

Background

The split phase-change heat exchanger is a high-efficiency heat exchange device, transfers heat through phase change of a working medium, and has a series of advantages of extremely high heat conductivity, good isothermal property, long-distance heat transfer, temperature control and the like.

The heat exchanger consists of an evaporation section and a condensation section of a circulating working medium, the circulating working medium is arranged in a heat exchange tube bundle, the evaporation section and the condensation section are mutually separated, and the evaporation section and the condensation section are connected into a circulating loop through a steam ascending tube and a condensate liquid return tube.

In split type phase change heat exchanger's engineering application, the hot-fluid passageway is arranged in to the evaporation zone tube bank, hot-fluid heat exchanger promptly, the evaporation zone tube bank absorbs hot fluid heat, the heat transmits the circulation medium in the tube bank through the heat absorption tube bank, the circulation medium heat absorption is changed into the vapour phase by the liquid phase, transmit to the condensation segment through the steam tedge, the cold-fluid passageway is arranged in to the condensation segment tube bank, cold-fluid heat exchanger promptly, thereby the vapour phase circulation medium is through heat release tube bank with heat transfer for the cold fluid condensation change into the liquid phase, back flow back to evaporation zone work through the condensate back flow, cycle in proper order, through high-efficient split type phase change heat transfer, realize cold, the purpose of hot-fluid heat transfer.

The split phase-change heat exchanger also has the characteristics of no external power, flexible arrangement, adjustable heat flow density, effective solution of cold and hot fluid leakage, realization of on-line performance recovery, low later maintenance and replacement cost and the like, thereby playing an important role in the fields of petrochemical industry, metallurgy, electric power, building materials, energy conservation, environmental protection and the like.

The split phase-change heat exchanger is mainly used for the working condition of gas-gas heat exchange, is an important characteristic of the split phase-change heat exchanger, and can be provided with fins outside the heat exchange tubes of the hot fluid heat exchange tube bundle and the cold fluid heat exchange tube bundle in order to strengthen heat transfer and improve the heat transfer efficiency of the whole heat exchanger.

In the steel industry, a blast furnace gas heater is used for heating blast furnace gas (cold fluid) by using the waste heat of flue gas (hot fluid) so as to improve the heat efficiency of blast furnace hot blast stoves, gas boilers and other thermal equipment. Because the blast furnace gas has the characteristic of containing ash, the gas side heat exchanger generally has the phenomenon of ash deposition when the equipment runs, and is difficult to remove, thereby bringing adverse effects to the stable operation of the equipment. The reason is mainly that in the prior art, coal gas mostly flows in a horizontal direction, the fin surface of the finned tube of the coal gas heat exchanger is in the horizontal direction, and dust is easily accumulated on the fin surface, so that heat exchange is influenced, and even an airflow channel is blocked. Compared with the prior art, the soot deposition degree of the flue gas side heat exchanger is light, and the soot deposition problem can be solved by adopting the flue gas flow rate of self-soot-cleaning or an online soot cleaner.

Disclosure of Invention

To the dust deposition problem ratio of blast furnace gas heat exchanger tube bank of iron and steel trade is more outstanding, influences the problem of equipment steady operation, the utility model discloses novel split type gas heat exchanger tube bank structure has been adopted innovatively for the unable deposit of dust is on the fin surface.

The utility model provides a prevent split type coal gas phase transition heat exchanger of deposition type, including flue gas heat exchanger tube bank and coal gas heat exchanger tube bank, wherein coal gas heat exchanger tube bank is higher than flue gas heat exchanger tube bank, the upper end of flue gas heat exchanger tube bank through steam tedge with coal gas heat exchanger tube bank's upper end is connected, the lower extreme of flue gas heat exchanger tube bank pass through the condensate back flow with coal gas heat exchanger tube bank's lower extreme is connected, coal gas heat exchanger tube level of coal gas heat exchanger tube bank is arranged, the vertical arrangement of fin on the heat exchange tube.

The flue gas heat exchange tube bundle is arranged in the shell of the flue gas heat exchanger, and the gas heat exchange tube bundle is arranged in the shell of the gas heat exchanger. The axial direction of the finned heat exchange tube of the coal gas heat exchange tube bundle is set to be the horizontal direction, so that the surface of the heat exchange tube fin is in the vertical direction, dust cannot be deposited on the surface of the fin, and the problem of dust deposition of the coal gas heat exchange tube bundle is effectively solved.

Preferably, the gas heat exchange tubes of the gas heat exchange tube bundle are arranged in an inclined manner in the horizontal direction, and the inlet end is higher than the outlet end. The power of phase change heat exchange and circulation of the working medium in the coal gas heat exchange tube bundle is enhanced, and the working medium flows to an outlet after being condensed.

Preferably, the gas heat exchange tube bundle comprises a left connecting tube, a plurality of gas heat exchange tubes and a right connecting tube; the plurality of coal gas heat exchange tubes are arranged in parallel, and two ends of each coal gas heat exchange tube are respectively connected with the left connecting tube and the right connecting tube.

Preferably, the number of the flue gas heat exchange tube bundles and the number of the coal gas heat exchange tube bundles are multiple; the plurality of flue gas heat exchange tube bundles and the plurality of coal gas heat exchange tube bundles are connected in a one-to-one correspondence manner to form respective independent circulation loops.

Preferably, the flue gas heat exchange tube bundle comprises an upper connecting tube, a plurality of flue gas heat exchange tubes and a lower connecting tube, and two ends of each flue gas heat exchange tube are respectively connected with the upper connecting tube and the lower connecting tube.

The utility model discloses arrange the coal gas heat exchange tube level of coal gas heat exchange tube bank to make the fin on the coal gas heat exchange tube be vertical arranging, the finned tube of having solved among the prior art coal gas heat exchange tube bank is vertical direction, and heat exchange tube fin surface is the horizontal direction, and dust in the blast furnace gas piles up on the fin surface easily, therefore influences the heat transfer, blocks airflow channel's technical problem even.

Compared with the prior art, the utility model, have following advantage:

(1) The structural characteristics of the gas heat exchange tube bundle fundamentally solve the problem of dust deposition of the gas heat exchanger;

(2) The flue gas heat exchange tube bundle and the coal gas heat exchange tube bundle can be separately arranged according to the field conditions, so that long-distance heat transfer can be realized, great flexibility is brought to the process design, and good conditions are created for the large-scale of the heat exchanger, the comprehensive utilization of heat energy and the optimization of a heat energy utilization system;

(3) The flue gas heat exchange tube bundle and the coal gas heat exchange tube bundle are independent from each other, and fluid separation and sealing are easy to realize;

(4) The flue gas heat exchange tube bundle and the coal gas heat exchange tube bundle can realize controllable heat flux density of the heat exchange tube and adjustable wall temperature of the heat exchange tube according to the change of operation conditions, so that the problem of dew point corrosion is effectively avoided.

Drawings

FIG. 1 is a schematic view of the ash deposition preventing type split gas phase change heat exchanger of the present invention;

FIG. 2 is a schematic view of the single-row heat exchange tube bundle independent circulation system of the present invention;

fig. 3 is a schematic view of the optimized coal gas heat exchange tube bundle of the utility model.

Reference numerals are as follows:

1. a flue gas heat exchanger housing; 2. 2-1 of a flue gas heat exchange tube bundle, 2-2 of a lower connecting tube, 2-3 of a flue gas heat exchange tube and an upper connecting tube; 3. a steam riser pipe; 4. a gas heat exchanger housing; 5. 5-1 parts of a gas heat exchange tube bundle, 5-2 parts of a left connecting tube, 5-3 parts of a gas heat exchange tube and a left connecting tube; 6. a condensate return pipe; 7. working medium.

Detailed Description

The invention is further described with reference to the following examples and drawings.

The utility model discloses a split type gas phase transition heat exchanger of dust deposition prevention type that shows as fig. 1 and fig. 2 adopts the waste heat of flue gas to heat blast furnace gas. The multiple smoke heat exchange tube bundles 2 are arranged in the smoke heat exchanger shell 1 along the smoke flowing direction and are in contact with smoke, and each smoke heat exchange tube bundle 2 comprises a lower connecting tube 2-1, a smoke heat exchange tube 2-2, an upper connecting tube 2-3 and the like. The multiple coal gas heat exchange tube bundles 5 are arranged in the coal gas heat exchanger shell 4 along the coal gas flowing direction and are in contact with coal gas, and the coal gas heat exchange tube bundles 5 comprise left connecting tubes 5-1, coal gas heat exchange tubes 5-2, right connecting tubes 5-3 and the like. Wherein, the plurality of coal gas heat exchange tube bundles 5 and the plurality of flue gas heat exchange tube bundles 2 are respectively connected in a one-to-one correspondence way through the steam ascending tubes 3 and the condensate return tubes 6 to respectively form an independent closed heat exchange circulating system.

When the flue gas transversely passes through the flue gas heat exchange tube bundle 2, the heat of the flue gas heats the working medium 7 in the tube bundle. The working medium 7 is vaporized after being heated, is transmitted to the gas heat exchange tube bundle 5 along the steam ascending tube 3 through the action of density difference, and heats the gas which transversely passes through the gas heat exchange tube bundle 5. The vaporized working medium 7 transfers the latent heat of condensation to the gas to become condensate, and returns to the flue gas heat exchange tube bundle 2 through the condensate return pipe 6 under the action of potential difference to be continuously heated by the flue gas, so that the energy transfer between the gas heat exchange tube bundle 5 and the flue gas heat exchange tube bundle 2 is formed through repeated circulation. The multiple rows of heat exchange tube bundles work together to complete the energy exchange between the flue gas and the blast furnace gas.

As shown in fig. 2, in the gas heat exchange tube bundle 5, the gas heat exchange tubes 5-2 are horizontally arranged, the heat exchange tubes are finned tubes, and the fin surface of the gas heat exchange tubes 5-2 is vertical, so that the phenomenon that dust in blast furnace gas is accumulated on the fin surface to affect heat exchange and even block an airflow channel is avoided.

As shown in fig. 3, in order to enhance the circulation effect of the working medium in the gas heat exchange tube bundle 5, the gas heat exchange tube 5-2 may be inclined by a certain angle α (for example, α =3 °) in the direction shown in the drawing, and the inlet end of the gas heat exchange tube is higher than the outlet end, so that the power of phase change heat exchange and circulation of the working medium in the gas heat exchange tube bundle 5 may be enhanced.

The above-described embodiments are only preferred embodiments of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several modifications and equivalent substitutions (for example, the cold fluid is other ash-containing medium than blast furnace gas) can be made, and these modifications and equivalent substitutions for the technical solutions of the present invention are included in the protection scope of the present invention.

Claims (5)

1. The utility model provides an anti-dust-deposition split type coal gas phase transition heat exchanger, includes flue gas heat exchanger tube bank and coal gas heat exchanger tube bank, wherein coal gas heat exchanger tube bank is higher than flue gas heat exchanger tube bank, the upper end of flue gas heat exchanger tube bank through steam tedge with the upper end of coal gas heat exchanger tube bank is connected, the lower extreme of flue gas heat exchanger tube bank through the condensate back flow with the lower extreme of coal gas heat exchanger tube bank is connected its characterized in that: the gas heat exchange tubes of the gas heat exchange tube bundle are horizontally arranged, and the fins on the heat exchange tubes are vertically arranged.

2. The ash deposition preventing type split gas phase-change heat exchanger of claim 1, wherein: the coal gas heat exchange tubes of the coal gas heat exchange tube bundle are obliquely arranged in the horizontal direction, and the inlet end is higher than the outlet end.

3. The ash deposition preventing type split gas phase-change heat exchanger of claim 1 or 2, characterized in that: the gas heat exchange tube bundle comprises a left connecting tube, a plurality of gas heat exchange tubes and a right connecting tube; the plurality of coal gas heat exchange tubes are arranged in parallel, and two ends of each coal gas heat exchange tube are respectively connected with the left connecting tube and the right connecting tube.

4. The ash deposition preventing type split gas phase-change heat exchanger of claim 1 or 2, characterized in that: the number of the flue gas heat exchange tube bundles and the number of the coal gas heat exchange tube bundles are multiple; the plurality of flue gas heat exchange tube bundles and the plurality of coal gas heat exchange tube bundles are connected in a one-to-one correspondence mode to form independent circulation loops respectively.

5. The ash deposition preventing type split gas phase-change heat exchanger of claim 1 or 2, characterized in that: the flue gas heat exchange tube bundle comprises an upper connecting tube, a plurality of flue gas heat exchange tubes and a lower connecting tube, and the two ends of each flue gas heat exchange tube are respectively connected with the upper connecting tube and the lower connecting tube.

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