CN216667638U - Fire tube and water tube mixed waste heat boiler - Google Patents

Abstract

The utility model discloses a fire tube and water tube mixed waste heat boiler which comprises a waste boiler steel structure and a fire-resistant lining, wherein the fire-resistant lining is processed on the inner wall of the upper part of the waste boiler steel structure, a fire tube waste boiler shell is arranged below the right side inside the fire-resistant lining, a plurality of groups of fire tube waste boiler heat exchange tube bundles are fixedly connected inside the fire tube waste boiler shell, and the upper ends of the plurality of water tube waste boiler heat exchange tube bundles are communicated with a saturated water outlet and a steam outlet through a water outlet and steam outlet collecting tube. The fire tube and water tube mixed waste heat boiler adopts the fire tube and water tube mixed waste heat boiler through the matching among the fire tube waste heat boiler shell, the fire tube waste heat boiler heat exchange tube bundle, the settling chamber, the water tube waste heat boiler heat exchange tube bundle, the low-temperature flue gas outlet, the high-temperature flue gas inlet and the water inlet of the saturated boiler, has longer service life, is suitable for a natural gas and water circulation mode, and avoids the scaling problem caused by dust contained in flue gas, and the problems of poor economical efficiency of the inspection and maintenance period, the service life and the waste heat boiler rate of the waste heat boiler.

Description

Fire tube and water tube mixed waste heat boiler

Technical Field

The utility model relates to the technical field of boilers, in particular to a fire tube and water tube mixed waste heat boiler.

Background

The waste heat boiler is the core equipment of a chemical device, and is generally used in an exothermic reactor or used after the exothermic reactor to quickly cool reaction gas; or the heat recovery device is used in the heat recovery of high-temperature gas, the waste heat boiler is divided into a fire tube type and a water tube type, the high-temperature medium of the fire tube type waste heat boiler flows into the heat exchange tube, the process medium can take high flow velocity, the heat exchange efficiency is high, scaling is not easy to occur, and the process medium is a pressure container; the utility model relates to a water pipe boiler, which is characterized in that a high-temperature medium of the water pipe boiler runs out of a pipe, the heat exchange efficiency is low, but the outside of the pipe is mostly normal pressure, and the water pipe boiler is suitable for clean or dry-ash-containing process media, in recent years, the heat energy of high-temperature dust-containing (some molten state) flue gas (or process gas) such as garbage incineration, salt-containing waste liquid incineration, coal gasification and the like is utilized, the waste heat boiler is required to work in a harsh environment with high-temperature dust-containing, and in order to solve the problem that the waste heat boiler is easy to scale and the heat transfer efficiency is worsened due to easy scaling of the dust-containing flue gas, the utility model particularly provides a fire pipe and water pipe mixed waste heat boiler structure. The high-temperature flue gas outlet fire tube waste boiler is cooled to 650-800 ℃, dust in the waste boiler is completely solidified, gas and solid are separated in a settling chamber, and the separated solid (dust) is discharged from a dust discharge port; the utility model relates to a method for controlling the flow rate of smoke in a settling chamber of a boiler, which comprises the following steps that smoke with less ash content in the settling chamber enters a heat exchange tube bundle (a plurality of rows) of a water tube boiler to exchange heat, and cooled low-temperature smoke is discharged from a low-temperature smoke outlet; according to the utility model, the side cavities of saturated water and saturated steam are connected in series, and the heat exchange pipe of the water pipe boiler is directly welded on the shell of the fire pipe waste boiler, so that the problem of stress caused by thermal expansion is solved ingeniously, and the large-scale boiler is easy to realize.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a mixed type waste heat boiler with fire tubes and water tubes, which solves the above problems of scaling caused by dust contained in flue gas, and poor inspection and maintenance cycle, service life and economic efficiency of waste heat boiler.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a firetube and water pipe hybrid waste heat boiler, includes waste boiler steel construction and fire-resistant lining, the processing of the top inner wall of waste boiler steel construction has fire-resistant lining, fire tube waste boiler casing is installed to fire tube waste boiler casing's inside right side below, the inside rigid coupling of fire tube waste boiler casing has multiunit fire tube waste boiler heat transfer tube bank, the lower extreme intercommunication of fire tube waste boiler casing has saturated boiler water inlet, the processing of fire tube waste boiler's left side lower extreme has the ash discharge mouth, the outer wall top intercommunication of fire tube waste boiler casing has a plurality of water pipe waste boiler heat transfer tube banks, and is a plurality of the upper end of water pipe waste boiler heat transfer tube bank is linked together through water + vapour export collecting pipe and saturated water + vapour export.

Preferably, a settling chamber is arranged on the left side inside the waste boiler steel structure.

Preferably, a low-temperature flue gas outlet is processed above the right side inside the waste boiler steel structure.

Preferably, the right end of the fire tube waste boiler heat exchange tube bundle is provided with a high-temperature flue gas inlet.

Compared with the prior art, the utility model has the beneficial effects that: the fire tube and water tube mixed waste heat boiler comprises:

the heat recovery system is particularly suitable for a heat recovery system of high-temperature dust-containing (meltable) flue gas (micro positive pressure, normal pressure and micro negative pressure), the heat exchange tube of the water-tube boiler is supported by the fire tube waste boiler shell, no tube plate exists, the equipment is easy to enlarge, the equipment runs more stably, the maintenance period is long, the service life of the equipment is longer, the heat recovery system is suitable for a natural gas and water circulation mode, and the problems of scaling caused by dust contained in the flue gas, maintenance period of the waste heat boiler, service life and poor economy of the waste heat boiler are solved.

Drawings

FIG. 1 is a schematic front view of the present invention;

fig. 2 is a left side view structural diagram of the present invention.

In the figure: 1. the boiler comprises a waste boiler steel structure, 2 parts of an ash discharge port, 3 parts of a fire tube waste boiler shell, 4 parts of a fire tube waste boiler heat exchange tube bundle, 5 parts of a settling chamber, 6 parts of a refractory lining, 7 parts of a water tube waste boiler heat exchange tube bundle, 8 parts of a water and steam outlet collecting pipe, 9 parts of a saturated water and steam outlet, 10 parts of a low-temperature flue gas outlet, 11 parts of a high-temperature flue gas inlet, 12 parts of a saturated boiler water inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a fire tube and water tube mixed waste heat boiler comprises a waste boiler steel structure 1 and a fire-resistant lining 6, wherein the fire-resistant lining 6 is processed on the inner wall of the upper part of the waste boiler steel structure 1, a fire tube waste boiler shell 3 is arranged below the right side of the inside of the fire-resistant lining 6, a plurality of groups of fire tube waste boiler heat exchange tube bundles 4 are fixedly connected inside the fire tube waste boiler shell 3, and flue gas flows in a tube and flows in a reverse U shape outside the tube; the heat exchange model is characterized in that saturated water and steam are connected in series, smoke dust in smoke in a settling chamber 5 is arranged to be cooled and solidified through a fire tube waste boiler shell 3, dust is removed through the settling chamber 5, a large-diameter heat exchange tube is adopted in the fire tube waste boiler shell 3, the influence of scaling on a flow channel is avoided, the water tube waste boiler heat exchange tube is welded on the fire tube waste boiler shell, the problem of thermal expansion is perfectly solved, equipment is easy to enlarge, the smoke in a fire tube waste boiler heat exchange tube bundle 4 adopts high flow velocity, and scaling is reduced; the flue gas in the settling chamber 5 adopts low flow velocity, which is beneficial to gas-solid separation, and the flue gas temperature at the waste fire tube boiler is high, mainly radiation heat transfer; the water pipe waste boiler flue gas temperature is low, with convection heat transfer as the main, adopt the flue gas high velocity of flow, the minor diameter heat exchange tube, the lower extreme intercommunication of firetube waste boiler casing 3 has saturated boiler water inlet 12, the left side lower extreme processing of refractory lining 6 has ash discharge port 2, the outer wall top intercommunication of firetube waste boiler casing 3 has a plurality of water pipe waste boiler heat transfer tube bundles 7, the upper end of a plurality of water pipe waste boiler heat transfer tube bundles 7 is linked together with saturated water + vapour export collecting pipe 8 through water + vapour export collecting pipe 8, the inside left side of waste boiler steel construction 1 is provided with deposit room 5, the inside right side top processing of waste boiler steel construction 1 has low temperature exhanst gas outlet 10, the right side end processing of firetube waste boiler heat transfer tube bundle 4 has high temperature exhanst gas inlet 11.

When the mixed type waste heat boiler with the fire tube and the water tube is required to be used, the specific steps are as follows:

firstly, high-temperature flue gas enters from a high-temperature flue gas inlet 11, and exchanges heat with saturated water in a heat exchange tube bundle 4 of the fire tube boiler and a shell 3 of the fire tube boiler to reduce the temperature;

secondly, the smoke cooled to 650-800 ℃ by the fire tube waste boiler shell 3 flows out of the fire tube waste boiler shell 3, enters the settling chamber 5 and turns back upwards, gas-solid separation is carried out in the settling chamber 5, and the separated solid smoke dust is discharged from the equipment through the ash discharge port 2;

thirdly, the flue gas out of the settling chamber 5 is turned back again and horizontally to exchange heat and cool through (multiple rows of) water pipe boiler heat exchange tube bundles 7 connected to the fire pipe waste boiler shell 3, and the low-temperature flue gas is discharged out of the waste boiler through a low-temperature flue gas outlet 10;

fourthly, arranging a soot blower on the flue gas side of the water pipe boiler, discharging one part of the removed dry ash through a settling chamber 5, and enabling the other part of the removed dry ash to enter a rear system along with the flue gas for dedusting;

the saturated water from the steam drum enters the fire tube waste boiler shell 3 from the saturated boiler water inlet 12, the flue gas in the same pipe exchanges heat and is gasified through the fire tube waste boiler heat exchange tube bundle 4, the generated saturated water and the steam enter the water tube waste boiler heat exchange tube bundle 4, exchange heat with the flue gas outside the heat exchange pipe through the water tube waste boiler heat exchange tube bundle 7, are further gasified, and are collected by the saturated water and gas outlet collecting pipe, and then the steam-water mixture is discharged from the saturated water and gas outlet device to the steam drum for steam-water separation;

sixthly, the waste heat boiler is suitable for a natural circulation mode.

Can realize the boiler through above-mentioned mode and use, compare with current waste heat boiler technique, this embodiment has adopted firetube and water pipe hybrid waste heat boiler, adopt different technological parameter design and structural design in different regions, make this patent be particularly useful for the heat recovery system of high temperature dusty (meltable) flue gas (pressure-fired, ordinary pressure, little negative pressure), the firetube waste heat boiler casing has been adopted to support water pipe boiler heat exchange tube, there is not the tube sheet, the easy macro-scale of equipment, equipment operation is more steady, examine the maintenance cycle length, equipment life is longer, be applicable to gas, water natural circulation mode, the scale deposit problem because the flue gas dusty produces has been avoided, the maintenance cycle is examined to waste heat boiler, the relatively poor problem of the economic nature of life and waste heat boiler rate.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a firetube and water pipe hybrid waste heat boiler, includes waste boiler steel construction (1) and refractory lining (6), the processing of the top inner wall of waste boiler steel construction (1) has refractory lining (6), its characterized in that: fire tube waste heat boiler casing (3) are installed to the inside right side below of fire-resistant lining (6), the inside rigid coupling of fire tube waste heat boiler casing (3) has multiunit fire tube waste heat boiler heat exchanger tube bank (4), the lower extreme intercommunication of fire tube waste heat boiler casing (3) has saturated boiler water inlet (12), the processing of the left side lower extreme of fire-resistant lining (6) has ash discharge mouth (2), the outer wall top intercommunication of fire tube waste heat boiler casing (3) has a plurality of water pipe waste heat boiler heat exchanger tube banks (7), and is a plurality of the upper end of water pipe waste heat exchanger tube bank (7) is linked together through water + vapour export collecting pipe (8) and saturated water + vapour export (9).

2. The fire tube and water tube hybrid waste heat boiler of claim 1, wherein: and a settling chamber (5) is arranged on the left side of the interior of the waste boiler steel structure (1).

3. The fire tube and water tube hybrid waste heat boiler of claim 1, wherein: and a low-temperature flue gas outlet (10) is processed above the right side inside the waste boiler steel structure (1).

4. The fire tube and water tube hybrid waste heat boiler of claim 1, wherein: the right end of the fire tube waste boiler heat exchange tube bundle (4) is provided with a high-temperature flue gas inlet (11).

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