Boiler flue gas waste heat utilization device

Abstract

The utility model discloses a boiler flue gas waste heat utilization device which comprises a gas outlet pipe connected to a boiler flue gas outlet, the other end of the gas outlet pipe is connected to a heat exchange box, a heat exchange structure is arranged in the heat exchange box and comprises a heat exchange pipe, opposite fixing holes which are transversely distributed are formed in the side wall of the heat exchange box, and connecting pieces are inserted in the fixing holes. The connecting pieces are pipe fittings, threads are arranged inside and outside the pipe fittings, one ends of the inner sides of the connecting pieces are in threaded connection with the heat exchange pipes, the other ends of the inner sides of the connecting pieces are in threaded connection with the water pipes, nuts are in threaded connection with the outer sides of the connecting pieces, the nuts abut against the side wall of the heat exchange box, and the heat exchange structures are arranged in the heat exchange box. High-temperature flue gas waste heat is subjected to heat exchange through the heat exchange pipe, the flue gas waste heat is effectively utilized, and energy is saved; and meanwhile, the heat exchange structure is easy to disassemble, so that the heat exchange pipes which are attached with smoke dust and influence the heat exchange efficiency can be conveniently cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas utilization technical field, concretely relates to a boiler flue gas waste heat utilization device. BACKGROUND

[0002] The existing power plant boiler combustion process can release high-temperature flue gas, and the high-temperature flue gas needs to be treated by denitration, desulfurization and dust removal and the like to reach the standard before being discharged into the air, and when the high-temperature flue gas is directly treated by the desulfurization and denitration equipment, the high-temperature heat is directly lost without recycling, causing energy waste; the existing Chinese utility model patent with the application number 202321040195.3 discloses a power station boiler flue gas waste heat recovery and utilization device, which is provided with a filtering structure, and then the high-temperature flue gas is utilized by being in contact with the heat exchange pipe to exchange heat; when the flue gas is in contact with the heat exchange pipe for a long time to exchange heat, part of the impurity dust can be attached to the heat exchange pipe, but the heat exchange pipe is fixedly arranged in the heat exchange chamber, and the cleaning is not convenient, thereby affecting the efficiency of the high-temperature flue gas waste heat recovery and utilization. SUMMARY

[0003] The utility model aims at the deficiency existing in the above background art, provides a device that is convenient for the disassembly, maintenance and repair of the heat exchange pipe to ensure the flue gas heat exchange effect and improve the flue gas waste heat utilization.

[0004] To achieve the above object, the utility model discloses a boiler flue gas waste heat utilization device, adopts the following technical scheme:

[0005] A boiler flue gas waste heat utilization device, comprising a gas outlet pipe connected to the flue gas outlet of a boiler, the other end of the gas outlet pipe being connected to a heat exchange box, the heat exchange box being provided with a heat exchange structure, the heat exchange structure comprising a heat exchange pipe, opposite horizontal fixing holes being formed in the side wall of the heat exchange box, a connecting piece being inserted into the fixing holes, the connecting piece being a pipe, threads being formed on the inner and outer surfaces of the pipe, one end of the connecting piece being threadedly connected to the heat exchange pipe, the other end of the connecting piece being threadedly connected to a water pipe, a nut being threadedly connected to the outer surface of the connecting piece, the nut abutting against the side wall of the heat exchange box, the heat exchange structure being provided with a plurality of groups and being arranged in the heat exchange box.

[0006] The further improvement of the utility model discloses a boiler flue gas waste heat utilization device lies in that a sealing gasket is arranged at the fixing hole, and the nut abuts against the sealing gasket.

[0007] The further improvement of the utility model discloses a boiler flue gas waste heat utilization device lies in that the connecting piece passes through the fixing hole, and the two ends of the connecting piece are arranged in the heat exchange box and outside the heat exchange box respectively.

[0008] The further improvement of the utility model discloses a boiler flue gas waste heat utilization device lies in that the gas outlet pipe comprises an arc-shaped section, and the arc-shaped section is provided with an adsorption structure for adsorbing smoke dust.

[0009] A further improvement of this utility model of a boiler flue gas waste heat utilization device is that a vertical partition is provided inside the heat exchange box, which divides the heat exchange box into two independent parts. The heat exchange box is provided with two sets of air inlets, which are distributed on both sides of the partition. The end of the air outlet pipe is connected to the air inlet through two sets of branch pipes, and valves are provided on the branch pipes.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention utilizes the waste heat of high-temperature flue gas through heat exchange tubes, effectively saving energy by utilizing the waste heat of flue gas. At the same time, the heat exchange structure is easy to disassemble, which facilitates the cleaning of heat exchange tubes that are covered with soot and affect the heat exchange efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] In the diagram: 1. Exhaust pipe, 2. Heat exchange box, 3. Heat exchange tube, 4. Connector, 5. Water pipe, 6. Nut, 7. Arc-shaped part, 8. Sealing gasket. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, a boiler flue gas waste heat utilization device includes an outlet pipe 1 connected to the boiler flue gas outlet, and the other end of the outlet pipe connected to a heat exchange box 2. The heat exchange box contains a heat exchange structure, which includes heat exchange tubes 3. Oppositely arranged horizontal fixing holes are formed on the side wall of the heat exchange box, and connectors 4 are inserted into these fixing holes. The connectors are pipe fittings with threads on both the inside and outside. One end of the connector is threaded to the heat exchange tube, and the other end is threaded to a water pipe 5. A thermometer can be installed on the water pipe to monitor the water temperature after heat exchange, thereby facilitating the detection of changes in heat exchange efficiency and determining the fault or dust accumulation on the heat exchange tube. Nuts 6 are screwed onto the outside of the connectors, and the nuts abut against the side wall of the heat exchange box. Multiple sets of heat exchange structures are arranged inside the heat exchange box.

[0016] A sealing gasket 8 is provided at the fixing hole, and the nut abuts against the sealing gasket. This includes the sealing performance of the heat exchange box.

[0017] The connector passes through the fixing hole, with its two ends positioned inside and outside the heat exchange box, respectively. This includes ensuring the stability of the heat exchange tube layout.

[0018] The outlet pipe comprises an arc-shaped section 7, and an adsorption structure for adsorbing smoke dust is arranged in the arc-shaped section. The flue gas is preliminarily filtered, and the influence of the smoke dust on the heat exchange pipe is reduced.

[0019] Further, a vertical partition plate is arranged in the heat exchange box, the partition plate divides the heat exchange box into two independent parts, two groups of air inlets are arranged on the heat exchange box, the two groups of air inlets are arranged on the two sides of the partition plate, the outlet pipe is connected to the air inlets through two groups of branch pipes, and valves are arranged on the branch pipes. Two groups of flue gas outlets are also arranged on the heat exchange box, and valves can also be arranged at the flue gas outlets. When the heat exchange efficiency is affected by the smoke dust attached to a heat exchange pipe and needs to be replaced, the air inlet valve of the part is closed, the air outlet valve is closed after a period of time, then the heat exchange structure is disassembled, and the heat exchange pipe is disassembled and cleaned.

[0020] The working principle of the utility model is as follows: high-temperature flue gas enters the heat exchange box, contacts the heat exchange pipe, exchanges heat with the cold water in the pipe, and realizes flue gas waste heat utilization; when the heat exchange water temperature is monitored to be lower than the normal value, the heat exchange structure is disassembled, the heat exchange pipe is cleaned, so that the heat exchange effect is ensured, and the effect of flue gas waste heat utilization is ensured.

[0021] It is apparent for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A boiler flue gas waste heat utilization device, characterized in that: The utility model provides a heat exchange structure of boiler, including the exhaust pipe that is connected to the boiler flue gas export, exhaust pipe other end is connected to the heat exchange box, be equipped with heat exchange structure in the heat exchange box, heat exchange structure includes heat exchange pipe, the lateral wall of heat exchange box is equipped with opposite transversely arranged fixed hole, and fixed hole inserts and is connected with connecting piece, connecting piece is the pipe, and pipe inside and outside is equipped with thread, and connecting piece inboard one end is connected with heat exchange pipe with thread, and the other end is connected with water pipe with thread, and connecting piece outside is screwed with nut, and nut is close to the lateral wall of heat exchange box, and heat exchange structure is equipped with multiple groups, and is arranged in the heat exchange box.

2. A boiler flue gas waste heat utilization device according to claim 1, characterized in that: The fixed hole is provided with a sealing gasket, and the nut abuts against the sealing gasket.

3. A boiler flue gas waste heat utilization device according to claim 2, characterized in that: The connecting piece passes through the fixed hole, and the connecting piece is arranged in the heat exchange box and outside the heat exchange box respectively.

4. A boiler flue gas waste heat utilization device according to claim 1, characterized in that: The exhaust pipe includes an arc-shaped section, and the arc-shaped section is provided with an adsorption structure for adsorbing smoke dust.

5. A boiler flue gas waste heat utilization device according to claim 4, characterized in that: The heat exchange box is provided with a vertical partition plate, the partition plate divides the heat exchange box into two independent parts, the heat exchange box is provided with two groups of air inlets, the two groups of air inlets are distributed on both sides of the partition plate, the end of the exhaust pipe is connected to the air inlets through two groups of branch pipes, and the branch pipes are provided with valves.

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