Sugar production furnace to prevent flue blockage and boiler

Abstract

The present application discloses a boiler for preventing flue clogging during furnace start-up for sugar production, comprising: a low-temperature superheater, a high-temperature superheater, a softened water storage tank, an economizer, and a steam cylinder; the flue gas inlet of the low-temperature superheater is connected to the flue gas outlet pipeline of the furnace; the steam inlet of the low-temperature superheater is connected to the steam outlet pipeline of the drum; the flue gas outlet of the low-temperature superheater is connected to the flue gas inlet pipeline of the high-temperature superheater; the steam outlet of the low-temperature superheater is connected to the steam inlet pipeline of the high-temperature superheater; the flue gas outlet of the high-temperature superheater is connected to the flue gas inlet pipeline of the economizer. The liquefied water in the gas cylinder is passed into the softened water tank, which not only recycles water resources but also increases the temperature of water entering the furnace. At the same time, there is no need to introduce additional energy-consuming equipment, thereby realizing effective recycling of energy. When the softened water after heat recovery passes through the economizer and air preheater, condensation on the outer wall of the economizer and air preheater tubes can be avoided, and the flue gas blockage between the tubes can be avoided, and shutdown for maintenance can be avoided, thereby improving production efficiency and boiler thermal efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of sugar production, and in particular to a boiler for preventing flue clogging when starting the furnace for sugar production. Background Art

[0002] During the use of existing boilers, the water temperature is too low when the boiler is just started. Since the softened water needs to enter the economizer and air preheater for heat exchange with the flue gas, the gap between the economizer and air preheater tubes is small at this time. The flue gas contains various impurities, which will combine with the water droplets condensed on the outer wall of the tubes, causing the flue in the tube gap to be blocked. After the flue is blocked, it needs to be manually cleaned and dredged. Not only is the dredging efficiency low, but it also affects the normal production. It needs to be shut down for cleaning, which makes it difficult to quickly put the boiler into normal use after maintenance.

[0003] The existing method requires preheating of softened water, and an electric heater is usually used to heat the softened water in the water tank, but this requires increased equipment investment and increased boiler electricity charges, which increases production investment and energy consumption.

[0004] Before the existing boiler distributes the generated steam to different production links according to production needs, the steam needs to be temporarily stored in the gas cylinder. After a long period of production, part of the steam in the gas cylinder liquefies to form a high-temperature liquid with a liquid temperature of up to 80°C. This part of the high-temperature water is mainly used to flush the slag in the superheater, and the heat cannot be effectively recycled.

[0005] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in the field. Utility Model Content

[0006] In view of the above technical problems, the present application provides a boiler for preventing flue blockage during startup for sugar production. The flue will not be blocked during startup, thus avoiding repeated shutdowns to clear the flue and improving sugar production efficiency.

[0007] The present application provides a boiler for preventing flue clogging during furnace start-up for sugar production, comprising: a low-temperature superheater, a high-temperature superheater, a softened water reservoir, an economizer, and a steam cylinder;

[0008] The flue gas inlet of the low-temperature superheater is connected to the flue gas outlet pipeline of the furnace; the steam inlet of the low-temperature superheater is connected to the steam outlet pipeline of the boiler drum;

[0009] The flue gas outlet of the low-temperature superheater is connected to the flue gas inlet pipeline of the high-temperature superheater; the steam outlet of the low-temperature superheater is connected to the steam inlet pipeline of the high-temperature superheater;

[0010] The flue gas outlet of the high-temperature superheater is connected to the flue gas inlet pipeline of the economizer;

[0011] The steam outlet of the high-temperature superheater is connected to the cylinder pipeline;

[0012] The liquid discharge port of the sub-cylinder is communicated with the softened water storage pipeline.

[0013] Preferably, it comprises: a drain valve; a drain valve is arranged on a pipeline connecting the drain port of the steam cylinder and the softened water reservoir.

[0014] Preferably, the liquid inlet of the economizer is connected to the softened water storage pipeline; the liquid outlet of the economizer is connected to the liquid inlet pipeline of the boiler drum.

[0015] Preferably, it comprises: an air preheater; the flue gas inlet of the economizer is connected with the flue gas inlet pipeline of the air preheater; the air outlet of the air preheater is connected with the air inlet pipeline of the furnace.

[0016] Preferably, the low-temperature superheater and the high-temperature superheater are both serpentine coil heat exchangers.

[0017] Preferably, the economizer and the air preheater are both serpentine coil heat exchangers.

[0018] The beneficial effects of this application include:

[0019] 1) The boiler for preventing flue clogging during furnace start-up provided in the present application for sugar production passes the liquefied water in the gas cylinder into the softened water tank, which not only recycles water resources but also increases the temperature of water entering the boiler. At the same time, no additional energy-consuming equipment is required, thereby realizing effective recycling of energy. When the reheated softened water passes through the economizer and air preheater, condensation on the outer wall of the economizer and air preheater tubes can be avoided, the flue between the tubes can be avoided, shutdown for maintenance can be avoided, production efficiency can be improved, and boiler thermal efficiency can be improved.

[0020] 2) The boiler for preventing flue clogging during furnace startup for sugar production provided in the present application can avoid frosting caused by too low flue gas temperature entering the air preheater after the inlet water temperature of the boiler is increased, thereby avoiding flue gas blockage caused by the gap between the tubes in the air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a boiler for preventing flue blockage during furnace starting for sugar production in at least one embodiment provided in the present application; Figure 1 The red line represents smoke; the blue line represents steam;

[0022] Legend:

[0023] Furnace 11, boiler drum 12, smoke exhaust port 13, low-temperature superheater 21, high-temperature superheater 22, softened water storage tank 3, economizer 31, air preheater 32, steam cylinder 4, drain valve 41. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0026] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0027] See also Figure 1 The boiler for preventing flue clogging during starting of sugar production provided in the present application comprises: a furnace 11, a boiler drum 12, a smoke outlet 13, a low-temperature superheater 21, a high-temperature superheater 22, a softened water storage tank 3, an economizer 31, an air preheater 32, and a steam cylinder 4;

[0028] The boiler includes: a furnace 11 and a drum 12; softened water is preheated and then introduced into the drum 12 to vaporize and produce steam. The furnace 11 is arranged at the bottom of the drum 12, and air is introduced into the furnace 11 to generate heat through combustion. A smoke exhaust port 13 is arranged at the top of the furnace 11 to generate high-temperature flue gas. In order to utilize the heat in this part of the flue gas, the flue gas is introduced into the air inlet of the low-temperature superheater 21 to heat the saturated steam entering the low-temperature superheater 21. After the steam is heated, it enters the high-temperature superheater 22 connected to the steam outlet pipeline of the low-temperature superheater 21 through a pipeline, and heat is exchanged with the flue gas again. At this time, the temperature of the saturated steam is further increased to superheated steam, and then it enters the sub-cylinder 4 through a pipeline. The sub-cylinder 4 is connected to the steam pipeline of each production link, and the sub-cylinder 4 can temporarily store the superheated steam, which is convenient for timely distribution according to production needs. The temperature of the flue gas introduced into the low-temperature superheater 21 is lower than that of the high-temperature superheater 22.

[0029] The softened water reservoir 3 is connected to the drain pipe provided at the bottom of the steam cylinder 4, and a drain valve 41 is provided on the connecting pipe. When a certain amount of high-temperature gas-liquid mixture accumulates in the steam cylinder 4, the temperature of this part of the material can reach 400°C, and it is discharged to the softened water reservoir 3 through the pipe to achieve the temperature increase of the softened water. Thus, the temperature increase of the softened water is completed without adding any equipment. The temperature of the preheated softened water can reach 65°C, and it enters the economizer 31 to continue heat exchange with the flue gas. After the softened water is further heated, the liquid outlet of the economizer 31 is connected to the liquid inlet pipe of the boiler drum 12, so that the preheated softened water is passed into the drum 12, thereby avoiding the too low temperature of the softened water entering the economizer 31, resulting in the blockage of the gap between the economizer 31 tubes. At the same time, it can also increase the temperature of the flue gas entering the air preheater 32, avoiding the formation of frost on the outer wall of the air preheater 32 tubes due to the too low temperature of the flue gas. After absorbing the heat of the tail flue gas in the preheater 32, the air temperature reaches more than 160 degrees and enters the furnace for combustion (oxygen). Softened water absorbs the flue gas temperature in the economizer 31, and the temperature rises to more than 150 degrees before entering the upper drum 12.

[0030] In a specific embodiment, the low-temperature superheater 21 and the high-temperature superheater 22 are arranged at intervals on the top of the boiler 1 to facilitate pipeline arrangement.

[0031] In a specific embodiment, both the low-temperature superheater 21 and the high-temperature superheater 22 are serpentine coil heat exchangers. The use of this type of heat exchanger can improve the heat exchange efficiency.

[0032] In a specific embodiment, the steam inlet of the low-temperature superheater 21 is connected to the steam outlet of the drum 12 through a pipeline; the smoke inlet of the low-temperature superheater 21 is connected to the smoke exhaust port 13 of the furnace 11 through a pipeline.

[0033] In a specific embodiment, the flue gas outlet of the low-temperature superheater 21 is connected to the flue gas inlet pipeline of the high-temperature superheater 22; the steam outlet of the low-temperature superheater 21 is connected to the steam inlet pipeline of the high-temperature superheater 22; the steam outlet of the high-temperature superheater 22 is connected to the cylinder 4 pipeline; the flue gas outlet of the high-temperature superheater 22 is connected to the flue gas inlet pipeline of the economizer 31.

[0034] In a specific embodiment, the flue gas inlet of the air preheater 32 is connected to the flue gas outlet pipeline of the economizer 31; an air inlet is set on one side of the air preheater 32, and a gas outlet is set on the other side of the air preheater 32, which is connected to the furnace 11 pipeline.

[0035] In a specific embodiment, it includes: a plurality of control valves; the control valves are arranged on the pipelines that need to control the flow of gas, steam, air and flue gas entering the furnace. Those skilled in the art can arrange them according to actual needs.

[0036] In a specific embodiment, it includes: a plurality of delivery pumps; the delivery pumps are used to deliver gas, steam, air, and flue gas into the furnace, and those skilled in the art can set them on specific delivery pipelines according to production needs.

[0037] In a specific embodiment, the air preheater 32 and the economizer 31 are both serpentine coil heat exchangers. The use of this type of heat exchanger can improve the heat exchange efficiency.

[0038] In a specific embodiment, the steam cylinder 4 of the 40 ton / hour boiler is connected to the outside of the softened water tank with a Φ57mm pipe, and a Φ32mm pipe of 50 meters is used to lead to the inside of the softened water tank. Required materials: Φ108 pipe 60 meters, Φ108 elbows 4, PVC pipe Φ90mmX4.3mm, 6 meters, elbows (PVC-UDe90 DN10) 3, flanges (PVC-U De90 DN10) 3, flanges (304-DN80-PN16) 1. The boiler transformation investment is small, the overall use effect is good, and there is no shutdown during the start-up stage during use.

[0039] The device was implemented at the Meng'a Sugar Factory of Yingmao Sugar Co., Ltd. in Xishuangbanna, Yunnan in 2022. After installing the device, condensation can be avoided when the boiler is started.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler for preventing flue clogging during starting of sugar production, characterized in that: include: Low-temperature superheater (21), high-temperature superheater (22), softened water reservoir (3), economizer (31), steam cylinder (4); The smoke inlet of the low-temperature superheater (21) is connected to the smoke exhaust port (13) of the furnace (11) through a pipeline; the steam inlet of the low-temperature superheater (21) is connected to the steam exhaust port of the boiler drum (12) through a pipeline; The flue gas outlet of the low-temperature superheater (21) is connected to the flue gas inlet pipeline of the high-temperature superheater (22); the steam outlet of the low-temperature superheater (21) is connected to the steam inlet pipeline of the high-temperature superheater (22); The flue gas outlet of the high-temperature superheater (22) is connected to the flue gas inlet pipeline of the economizer (31); The steam outlet of the high-temperature superheater (22) is connected to the pipeline of the steam cylinder (4); The liquid discharge port of the steam sub-cylinder (4) is connected to the pipeline of the softened water storage tank (3).

2. The boiler for preventing flue clogging when starting the sugar production according to claim 1 is characterized in that: include: A drain valve (41) is provided on a pipeline connecting the drain port of the steam cylinder (4) and the softened water reservoir (3).

3. The boiler for preventing flue clogging for sugar production according to claim 1, characterized in that: The liquid inlet of the economizer (31) is connected to the pipeline of the softened water storage tank (3); the liquid outlet of the economizer (31) is connected to the liquid inlet pipeline of the boiler drum (12).

4. The boiler for preventing flue clogging for sugar production according to claim 1, characterized in that: include: air preheater (32); the flue gas inlet of the economizer (31) is connected to the flue gas inlet pipeline of the air preheater (32); The air outlet of the air preheater (32) is connected to the air inlet pipeline of the furnace (11).

5. The boiler for preventing flue clogging when starting the sugar production according to claim 1 is characterized in that: The low-temperature superheater (21) and the high-temperature superheater (22) are both serpentine coil heat exchangers.

6. The boiler for preventing flue clogging when starting the sugar production according to claim 1 is characterized in that: The economizer (31) and the air preheater (32) are both serpentine coil heat exchangers.

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