CN211176755U - System for preheating boiler deaerated water by low-temperature boiler flue gas - Google Patents
System for preheating boiler deaerated water by low-temperature boiler flue gas Download PDFInfo
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- CN211176755U CN211176755U CN201921674858.0U CN201921674858U CN211176755U CN 211176755 U CN211176755 U CN 211176755U CN 201921674858 U CN201921674858 U CN 201921674858U CN 211176755 U CN211176755 U CN 211176755U
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- intermediate medium
- pipeline
- boiler
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Abstract
The utility model discloses a system for preheating boiler deoxygenated water by using low-temperature boiler flue gas, which comprises a first heat exchanger and a second heat exchanger; an intermediate medium is arranged in a heat exchange tube of the first heat exchanger, and flue gas is arranged outside the heat exchange tube; the deaerated water of the boiler is arranged in the heat exchange pipe of the second heat exchanger, and the intermediate medium is arranged outside the heat exchange pipe; the first intermediate medium outlet is communicated with the second intermediate medium inlet through a first pipeline, and the second intermediate medium outlet is communicated with the first intermediate medium inlet through a second pipeline; the two ends of the third pipeline are respectively connected to the first pipeline and the second pipeline; the first valve is arranged on the first pipeline and is positioned between the end part of the third pipeline and the second intermediate medium inlet; a second valve and a temperature tester are arranged on the second pipeline, and the second valve is positioned between the end part of the third pipeline and the second intermediate medium outlet; and a third valve is arranged on the third pipeline. The utility model discloses in the heat of the boiler low temperature flue gas of retrieving under the condition that does not have dew point corrosion.
Description
Technical Field
The utility model relates to a low temperature boiler flue gas waste heat utilization field especially relates to a system for preheat boiler deoxidization water with low temperature boiler flue gas.
Background
In order to prevent low-temperature corrosion, the traditional gas-fired boiler ensures that the temperature of flue gas is higher than the acid dew point temperature, generally cannot utilize the low-temperature flue gas waste heat of 145-165 ℃, and most of heat in the flue gas is wasted. The utilization of the waste heat of the existing flue gas mainly aims at the utilization of high-degree flue gas, and the utilization of low-temperature flue gas can cause the problems that flue gas is arranged on one side of a pipeline in a condenser, and condensing fluid for absorbing heat is arranged on the other side of the pipeline, so that the flue gas generates dew point corrosion on a heated surface due to the low temperature of the condensing fluid, and the service life of heat exchange equipment is seriously influenced. The boiler deoxygenated water needs to be heated to the temperature of 103-104 ℃ for deoxygenation, and more energy is needed for heating by using steam; if the low-temperature flue gas is directly used for preheating the boiler deoxygenated water, dew point corrosion can be generated because the temperature of the boiler deoxygenated water before and after heating is lower than the dew point temperature of the flue gas; therefore, a method is urgently needed to enable the low-temperature flue gas to preheat the boiler deaerated water and avoid dew point corrosion.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system for preheat boiler deoxidization water with low temperature boiler flue gas.
The utility model discloses an innovation point lies in can utilizing low temperature flue gas preheating boiler deoxidization water can not produce dew point corrosion again.
In order to realize the purpose of the utility model, the technical proposal of the utility model is that: a system for preheating boiler deoxygenated water by using low-temperature boiler flue gas is characterized by comprising two heat exchangers, wherein each heat exchanger comprises a heat exchanger shell and a heat exchange pipe positioned in the heat exchanger shell, the two heat exchangers are respectively a first heat exchanger and a second heat exchanger, the first heat exchanger is used for exchanging heat between the flue gas and an intermediate medium, and the second heat exchanger is used for exchanging heat between the boiler deoxygenated water and the intermediate medium; an intermediate medium is arranged in a heat exchange tube of the first heat exchanger, flue gas is arranged outside the heat exchange tube, the temperature of the intermediate medium in the first heat exchange tube is higher than the dew point temperature of the flue gas and lower than the temperature of the flue gas, and a low-temperature flue gas inlet, a low-temperature flue gas outlet, a first intermediate medium inlet and a first intermediate medium outlet are arranged on the first heat exchanger; the second heat exchanger is provided with a second intermediate medium inlet, a second intermediate medium outlet, a boiler deoxygenated water inlet and a filtered deoxygenated water outlet; the first intermediate medium outlet is communicated with the second intermediate medium inlet through a first pipeline, and the second intermediate medium outlet is communicated with the first intermediate medium inlet through a second pipeline; the two ends of the third pipeline are respectively connected to the first pipeline and the second pipeline; circulating pumps are arranged on the first pipeline, the second pipeline and the third pipeline; the first valve is arranged on the first pipeline and is positioned between the end part of the third pipeline and the second intermediate medium inlet; the second pipeline is provided with a second valve and a temperature tester, the second valve is positioned between the end part of the third pipeline and the second intermediate medium outlet, and the temperature tester is positioned between the end part of the third pipeline and the first intermediate medium inlet; and a third valve is arranged on the third pipeline. Can be through the valve opening degree size of a valve, No. two valves, No. three valves to the temperature of intermediate medium in the adjustment entering heat exchanger makes the temperature of intermediate medium slightly be higher than dew point temperature in entering heat exchanger, has avoided dew point corrosion, can realize the waste heat recovery of boiler low temperature flue gas and preheating of boiler deaerated water through intermediate medium again.
Furthermore, fins are arranged on the outer walls of the heat exchange tubes of the first heat exchanger and the second heat exchanger. Further improving the heat exchange efficiency.
Furthermore, spoilers are arranged in the heat exchange tubes of the first heat exchanger and the second heat exchanger. The heat exchange coefficient of the inner side of the heat exchange tube is enhanced.
Further, the intermediate medium is water or steam.
Furthermore, the heat exchange tubes of the first heat exchanger and the second heat exchanger are of split structures and are formed by connecting a plurality of sections of straight tubes and elbows in a screwing mode. When partial heat exchange tubes are damaged, partial heat exchange tubes can be replaced without integral replacement.
Furthermore, the heat exchange tube in the first heat exchanger is made of 316L stainless steel, and 316L stainless steel is corrosion-resistant and has high heat exchange efficiency.
The utility model has the advantages that:
1. the utility model discloses in can be through the valve opening degree size of a valve, No. two valves, No. three valves to the adjustment gets into the temperature of middle medium in the heat exchanger, makes the temperature that gets into middle medium in the heat exchanger be a little higher than dew point temperature, has avoided dew point corrosion, can realize the waste heat recovery of boiler low temperature flue gas and preheating of boiler oxygen-eliminating water again through middle medium, the heat of the boiler low temperature flue gas of the recovery as far as possible under the condition that does not have dew point corrosion.
Drawings
Fig. 1 is a schematic structural view of embodiment 1.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The embodiment 1 is that as shown in figure 1, the system for preheating the deaerated water of the boiler by using the low-temperature boiler flue gas comprises two heat exchangers, each heat exchanger comprises a heat exchanger shell and a heat exchange pipe arranged in the heat exchanger shell, the two heat exchangers are a first heat exchanger 1 and a second heat exchanger 2 respectively, the first heat exchanger 1 is used for heat exchange of the flue gas and an intermediate medium, the second heat exchanger 2 is used for heat exchange of the deaerated water of the boiler and the intermediate medium, the intermediate medium is arranged in the heat exchange pipe of the first heat exchanger 1, the flue gas is arranged outside the heat exchange pipe, the temperature of the intermediate medium in the first heat exchange pipe 1 is higher than the dew point temperature of the flue gas and lower than the dew point temperature of the flue gas, the first heat exchanger 1 is provided with a low-temperature flue gas inlet 3, a low-temperature flue gas outlet 4, a first intermediate medium inlet 5 and a first intermediate medium outlet 6, the heat exchange pipe of the second heat exchanger 2 is provided with the intermediate medium, the intermediate medium is arranged outside the heat exchange pipe, the second heat exchange pipe is provided with the intermediate medium inlet 7, the intermediate medium outlet 8, the deaerated water inlet 9 and a filtered deaerated water outlet 10, the intermediate medium outlet 6 is provided with a water or, the heat exchanger 2, the intermediate medium inlet 7, the heat exchange pipe is provided with a second medium inlet 7, the heat exchanger 2, the heat exchange pipe 13 is provided with a third heat exchanger 13, the heat exchange pipe 11, the heat exchange pipe 13 is provided with a heat exchanger 13, the heat exchange pipe 11, the heat exchanger 13 is provided with a heat exchanger 12, the heat exchange pipe 13 heat exchanger 11, the heat exchanger 11 is provided with a heat exchange pipe 11, the heat exchanger 13 is provided with a heat exchange pipe, the heat exchanger 12, the heat exchange pipe 13 heat exchanger 13 is provided with a heat exchanger 13 heat exchanger, the heat exchanger 13 is provided with a heat exchanger 12, the heat exchanger 13 heat exchanger, the heat exchanger 12 is provided with a heat exchanger, the heat exchanger 11, the heat exchanger 13.
When the heat exchanger works, a circulating pump on a first pipeline 11, a second pipeline 12 and a third pipeline 13 is opened, low-temperature flue gas of a boiler is fed, deaerated water of the boiler is fed, after heat exchange is carried out between intermediate medium in a first heat exchanger 1 and low-temperature flue gas in the first heat exchanger, the temperature of the intermediate medium coming out of the first heat exchanger 1 is raised, the intermediate medium enters a second heat exchanger 2, the intermediate medium in the second heat exchanger 2 exchanges heat with deaerated water of the boiler, the temperature of the intermediate medium coming out of the second heat exchanger 2 is reduced, then the intermediate medium coming out of the first heat exchanger 1 and the intermediate medium coming out of the second heat exchanger 2 are mixed, the opening degrees of a first valve 14, a second valve 15 and a third valve 17 are adjusted, so that the temperature of the intermediate medium entering the first heat exchanger 1 is adjusted, the temperature of the intermediate medium entering the first heat exchanger 1 is slightly higher than the dew point temperature, when the temperature tester 16 tests that the temperature is, the third valve 17 is adjusted to be larger, the first valve 14 and the second valve 15 are adjusted to be smaller; when the temperature tester 16 tests that the temperature is too low, the third valve 17 is turned down, and the first valve 14 and the second valve 15 are turned up.
The described embodiments are only some, but not all embodiments of the invention. 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.
Claims (6)
1. A system for preheating boiler deoxygenated water by using low-temperature boiler flue gas is characterized by comprising two heat exchangers, wherein each heat exchanger comprises a heat exchanger shell and a heat exchange pipe positioned in the heat exchanger shell, the two heat exchangers are respectively a first heat exchanger and a second heat exchanger, the first heat exchanger is used for exchanging heat between the flue gas and an intermediate medium, and the second heat exchanger is used for exchanging heat between the boiler deoxygenated water and the intermediate medium; an intermediate medium is arranged in a heat exchange tube of the first heat exchanger, flue gas is arranged outside the heat exchange tube, the temperature of the intermediate medium in the first heat exchange tube is higher than the dew point temperature of the flue gas and lower than the temperature of the flue gas, and a low-temperature flue gas inlet, a low-temperature flue gas outlet, a first intermediate medium inlet and a first intermediate medium outlet are arranged on the first heat exchanger; the second heat exchanger is provided with a second intermediate medium inlet, a second intermediate medium outlet, a boiler deoxygenated water inlet and a filtered deoxygenated water outlet; the first intermediate medium outlet is communicated with the second intermediate medium inlet through a first pipeline, and the second intermediate medium outlet is communicated with the first intermediate medium inlet through a second pipeline; the two ends of the third pipeline are respectively connected to the first pipeline and the second pipeline; circulating pumps are arranged on the first pipeline, the second pipeline and the third pipeline; the first valve is arranged on the first pipeline and is positioned between the end part of the third pipeline and the second intermediate medium inlet; the second pipeline is provided with a second valve and a temperature tester, the second valve is positioned between the end part of the third pipeline and the second intermediate medium outlet, and the temperature tester is positioned between the end part of the third pipeline and the first intermediate medium inlet; and a third valve is arranged on the third pipeline.
2. The system for preheating the boiler deoxygenated water by using the low-temperature boiler flue gas as claimed in claim 1, wherein fins are arranged on the outer walls of the heat exchange tubes of the first heat exchanger and the second heat exchanger.
3. The system for preheating the deaerated water in the boiler by using the flue gas of the low-temperature boiler as claimed in claim 2, wherein a turbolator is arranged in the heat exchange tube of the first heat exchanger and the second heat exchanger.
4. The system for preheating boiler deoxygenated water with low temperature boiler flue gas of claim 1, wherein the intermediate medium is water or steam.
5. The system for preheating the deaerated water in the boiler by using the flue gas of the low-temperature boiler as claimed in claim 1, wherein the heat exchange tubes of the first heat exchanger and the second heat exchanger are of a split structure, and the heat exchange tubes are formed by spirally connecting a plurality of sections of straight tubes and elbows.
6. The system for preheating the boiler deoxygenated water by the low-temperature boiler flue gas as recited in claim 1, wherein the heat exchange tubes in the first heat exchanger are made of 316L stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921674858.0U CN211176755U (en) | 2019-10-09 | 2019-10-09 | System for preheating boiler deaerated water by low-temperature boiler flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921674858.0U CN211176755U (en) | 2019-10-09 | 2019-10-09 | System for preheating boiler deaerated water by low-temperature boiler flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211176755U true CN211176755U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921674858.0U Active CN211176755U (en) | 2019-10-09 | 2019-10-09 | System for preheating boiler deaerated water by low-temperature boiler flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211176755U (en) |
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2019
- 2019-10-09 CN CN201921674858.0U patent/CN211176755U/en active Active
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