Boiler flue gas temperature control device
By installing multiple economizers and controlling the water inlet pipeline in the waste heat furnace, the flue gas temperature can be flexibly adjusted, solving the problem that excessively low flue gas temperature affects the denitrification efficiency and ensuring the effectiveness and convenience of denitrification treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-10
AI Technical Summary
Low flue gas temperature inside the boiler affects the efficiency of SCR denitrification, and existing technologies are unable to effectively control the flue gas temperature to meet the requirements of low-temperature denitrification reaction.
First and second economizers are installed in the waste heat furnace, and primary or secondary heat exchange is achieved by controlling the opening and closing of the water inlet pipe and water supply valve to regulate the flue gas temperature and ensure that the flue gas is denitrified within a suitable temperature range.
It effectively regulates flue gas temperature, ensures denitrification efficiency, avoids excessively low temperatures from affecting the denitrification effect, and has a simple structure and is easy to use.
Smart Images
Figure CN224108181U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of boiler equipment relates to a boiler flue gas temperature control device. BACKGROUND
[0002] In order to prevent pollution of the environment, the flue gas generated by coal combustion in the boiler needs to be treated by SCR denitration, and before the flue gas is denitrated, in order to improve the utilization rate of heat in the flue gas, heat exchange is usually required in the waste heat boiler, but sometimes the temperature of the flue gas input into the waste heat boiler is low, and after heat exchange, the temperature of the flue gas is lower than the temperature required for low-temperature denitration reaction, affecting the denitration efficiency. SUMMARY
[0003] The utility model discloses a boiler flue gas temperature control device to solve the technical problem of the prior art.
[0004] Therefore, the utility model adopts the following technical scheme:
[0005] A boiler flue gas temperature control device, comprising a waste heat furnace, a first economizer and a second economizer are arranged in the waste heat furnace, a first water inlet pipe and a first water outlet pipe are arranged on the first economizer, a second water inlet pipe and a second water outlet pipe are arranged on the second economizer, the first water outlet pipe and the second water inlet pipe pass through the side wall of the waste heat furnace, the first water outlet pipe is connected with a first water conveying pipe, the first water conveying pipe is connected with the second water inlet pipe, a first water conveying valve is arranged on the first water conveying pipe, the first water inlet pipe passes through the side wall of the waste heat furnace, the first water inlet pipe is connected with a water inlet main pipe, a second water conveying pipe is connected to the side wall of the water inlet main pipe, the second water conveying pipe is connected with the second water inlet pipe, and a second water conveying valve is arranged on the second water conveying pipe.
[0006] Further, a first water inlet valve is arranged on the first water inlet pipe.
[0007] Further, the second water outlet pipe passes through the side wall of the waste heat furnace, and the second water outlet pipe is connected with a drain pipe.
[0008] Further, a drain valve is arranged on the drain pipe.
[0009] The utility model has the advantages that the first economizer and the second economizer are arranged in the waste heat furnace, and the first economizer and the second economizer are connected, when the temperature of the flue gas input into the waste heat furnace is high, heat exchange is carried out through the two economizers, the heat in the flue gas is effectively utilized, when the temperature of the flue gas input into the waste heat furnace is low, heat exchange is carried out through one economizer to prevent the temperature from being too low and affecting the denitration efficiency, and the structure is simple and the use is convenient. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a structural schematic view of the utility model.
[0011] In the figure, 1 - waste heat boiler, 2 - first economizer, 3 - second economizer, 4 - first water inlet pipe, 5 - first water outlet pipe, 6 - second water inlet pipe, 7 - second water outlet pipe, 8 - first water delivery pipe, 9 - first water delivery valve, 10 - water inlet main pipe, 11 - second water delivery pipe, 12 - second water delivery valve, 13 - first water inlet valve, 14 - drain pipe, 15 - drain valve. DETAILED DESCRIPTION
[0012] The utility model will be described in detail below in combination with the drawings:
[0013] As Figure 1 shown, a boiler flue gas temperature control device, including waste heat boiler 1, waste heat boiler 1 is equipped with first economizer 2 and second economizer 3, and first economizer 2 and second economizer 3 all adopt existing conventional economizer, and first economizer 2 and second economizer 3 are used to heat exchange the flue gas in waste heat boiler 1 and reduce the temperature of flue gas, and second economizer 3 is located above first economizer 2, and first economizer 2 is connected with first water inlet pipe 4 and first water outlet pipe 5, and first water inlet pipe 4 is used to deliver water to first economizer 2, and the water in first economizer 2 is discharged from first water outlet pipe 5 after heat exchange, and similarly, second economizer 3 is connected with second water inlet pipe 6 and second water outlet pipe 7, and first water outlet pipe 5 and second water inlet pipe 6 are out of the side wall of waste heat boiler 1, and first water outlet pipe 5 is connected with first water delivery pipe 8, and first water delivery pipe 8 is connected with second water inlet pipe 6, and the water discharged from first water outlet pipe 5 can be input into second economizer 3 through second water inlet pipe 6 to heat exchange again, and further reduce the temperature of flue gas in waste heat boiler 1, and first water delivery pipe 8 is equipped with first water delivery valve 9, and in addition, first water inlet pipe 4 is out of the side wall of waste heat boiler 1, and first water inlet pipe 4 is connected with water inlet main pipe 10, and water inlet main pipe 10 is used to input water from outside, and first water inlet pipe 4 is equipped with first water inlet valve 13, and closing first water inlet valve 13 can stop water delivery to first water inlet pipe 4 and first economizer 2, and the side wall of water inlet main pipe 10 is connected with second water delivery pipe 11, and second water delivery pipe 11 is connected with second water inlet pipe 6, and water can be input into second water inlet pipe 6 directly through second water delivery pipe 11 without first economizer 2, so that only second economizer 3 is used to reduce the temperature of flue gas in waste heat boiler 1 in the use process, and second water delivery pipe 11 is equipped with second water delivery valve 12,
[0014] In addition, second water outlet pipe 7 is out of the side wall of waste heat boiler 1, and second water outlet pipe 7 is connected with drain pipe 14, and drain pipe 14 is equipped with drain valve 15,
[0015] The use mode of the utility model is as follows:
[0016] When the flue gas temperature input into the waste heat boiler 1 is high, the first water conveying valve 9 and the first water inlet valve 13 can be opened, the second water outlet valve 12 can be closed, water can be input into the first water inlet pipe 4 through the water inlet pipe 10, the first water inlet pipe 4, the first economizer 2 for the first heat exchange, the water can be discharged from the first economizer 2 through the first water outlet pipe 5 after the first heat exchange, then input into the second water inlet pipe 6 through the first water conveying pipe 8, then the second economizer 3 for the second heat exchange, the water can be input into the drain pipe 14 through the second water outlet pipe 7 after the first heat exchange, the flue gas temperature in the waste heat boiler 1 can be effectively reduced through the two heat exchanges, and the heat in the flue gas can be effectively utilized, and the flue gas after temperature reduction can ensure the desulfurization efficiency.
[0017] When the flue gas temperature input into the waste heat boiler 1 is low, the first water conveying valve 9 and the first water inlet valve 13 can be closed, the second water outlet valve 12 can be opened, water can be input into the second water inlet pipe 6 through the second water conveying pipe 11 and the water inlet pipe 10, then the second economizer 3 for heat exchange, the water can be input into the drain pipe 14 through the second water outlet pipe 7 after the heat exchange, the flue gas can be heat exchanged only once, which can effectively prevent the flue gas temperature discharged from the waste heat boiler 1 from being too low to affect the subsequent desulfurization efficiency, the device can heat exchange once or twice according to the flue gas temperature input into the waste heat boiler 1, and then control the flue gas temperature discharged from the waste heat boiler 1, effectively prevent the flue gas temperature discharged from the waste heat boiler 1 from being too low to affect the desulfurization efficiency.
Claims
1. A boiler flue gas temperature control device, characterized by, The application relates to a waste heat boiler (1) which is internally provided with a first economizer (2) and a second economizer (3), the first economizer (2) is connected with a first water inlet pipe (4) and a first water outlet pipe (5), the second economizer (3) is connected with a second water inlet pipe (6) and a second water outlet pipe (7), the first water outlet pipe (5) and the second water inlet pipe (6) are led out from the side wall of the waste heat boiler (1), the first water outlet pipe (5) is connected with a first water conveying pipe (8), the first water conveying pipe (8) is connected with the second water inlet pipe (6), the first water conveying pipe (8) is provided with a first water conveying valve (9), the first water inlet pipe (4) is led out from the side wall of the waste heat boiler (1), the first water inlet pipe (4) is connected with a water inlet main pipe (10), the water inlet main pipe (10) is connected with a second water conveying pipe (11), the second water conveying pipe (11) is connected with the second water inlet pipe (6), and the second water conveying pipe (11) is provided with a second water conveying valve (12).
2. A boiler flue gas temperature control device according to claim 1, characterised in that, The first water inlet pipe (4) is provided with a first water inlet valve (13).
3. A boiler flue gas temperature control device according to claim 1, characterised in that, The second water outlet pipe (7) is led out from the side wall of the waste heat boiler (1), and the second water outlet pipe (7) is connected with a water outlet pipe (14).
4. A boiler flue gas temperature control device according to claim 3, characterised in that, The water outlet pipe (14) is provided with a water outlet valve (15).