Automatic flue gas temperature control device

Abstract

The utility model discloses an automatic flue gas temperature control device which comprises a heat exchanger, an inlet pipeline and an outlet pipeline are arranged on the two sides of the heat exchanger respectively, a heat exchanger inlet valve is arranged on the inlet pipeline, temperature monitors are arranged on the inlet pipeline and the outlet pipeline respectively, a frequency conversion fan is arranged at one end of the heat exchanger, and a frequency conversion fan is arranged at the other end of the heat exchanger. The fan frequency is adjusted according to temperature frequency conversion; a bypass pipeline is arranged between the inlet pipeline and the outlet pipeline, the bypass pipeline is connected with the heat exchanger in parallel, and a heat exchanger bypass valve is arranged on the bypass pipeline. According to the utility model, automation can be realized, and the amount of flue gas entering the heat exchanger and the bypass is automatically adjusted, so that the temperature of the flue gas entering the heat exchanger and reaching the inlet of the dust remover is always kept within a certain stable range.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, in particular to a flue gas temperature automatic control device. Background Art

[0002] Waste gas is generated in the production of glass kilns. Environmental protection equipment is required to purify the flue gas before it can be discharged into the atmosphere. Each section of the environmental protection equipment has temperature requirements and requires certain temperature control, especially the dust collector inlet temperature requirement is generally 180 ~ 250 ℃. Below 180 ℃ will cause SO2 and baking soda (desulfurizer) to react poorly, and above 250 ℃ will burn the bags in the dust collector. Waste heat boiler uses water and other media to exchange heat to control the temperature during the production of the kiln. It is a traditional flue gas temperature cooling device. The high-temperature flue gas released during the kiln production process is transported to the inlet of the waste heat boiler through the flue, then flows through the desulfurization tower and dust collector, and finally discharged into the atmosphere through the chimney. Currently available waste heat boilers use water as a cooling medium and generate a large amount of steam during the cooling process. What actually runs in the pipeline is a steam-water mixture. Long-term use will corrode the heat transfer components and is not conducive to equipment maintenance. Secondly, the waste heat boiler itself is a special equipment. When the steam pressure generated is too high, there is a safety risk. The most important thing is that the temperature cannot be adjusted automatically. Utility Model Content

[0003] In order to solve the problems raised in the above background technology, the utility model provides a flue gas temperature automatic control device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A flue gas temperature automatic control device comprises a heat exchanger, wherein an inlet pipeline and an outlet pipeline are respectively arranged on both sides of the heat exchanger, a heat exchanger inlet valve is arranged on the inlet pipeline, and both the inlet pipeline and the outlet pipeline are provided with temperature monitors, and a variable frequency fan is arranged at one end of the heat exchanger, and the fan frequency is adjusted according to the temperature variable frequency;

[0006] A bypass pipeline is provided between the inlet pipeline and the outlet pipeline, the bypass pipeline is connected in parallel with the heat exchanger, and a heat exchanger bypass valve is provided on the bypass pipeline.

[0007] Further technology of the utility model:

[0008] Preferably, the heat exchanger inlet valve and the heat exchanger bypass valve are both provided with intelligent interlocking opening controllers, the variable frequency fan is provided with a fan frequency monitor, and the output ends of the intelligent interlocking opening controller and the fan frequency monitor are electrically connected to the flue gas temperature monitor.

[0009] Preferably, a control cabinet is provided on one side of the heat exchanger, and the intelligent interlocking opening controller, flue gas temperature monitor and fan frequency monitor are placed inside the control cabinet.

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

[0011] The flue gas temperature automatic control device proposed in the utility model can realize automation and automatically adjust the flue gas volume entering the heat exchanger and the bypass, so that the flue gas temperature reaching the dust collector inlet after entering the heat exchanger is finally maintained within a certain stable range, avoiding the use of manual labor and saving operation and maintenance costs. On the other hand, the heat exchanger has a simple structural design and easy component replacement, which reduces the maintenance cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a structural schematic diagram of the flue gas temperature automatic control device;

[0014] Figure 2 This is a schematic diagram of the control cabinet;

[0015] Among them: 1. Heat exchanger inlet flue gas temperature monitor; 2. Heat exchanger inlet valve; 3. Heat exchanger bypass valve; 4. Heat exchanger outlet flue gas temperature monitor; 5. Variable frequency fan; 6. Control cabinet; 7. Intelligent interlocking opening controller; 8. Fan frequency monitor. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific drawings.

[0017] Example:

[0018] like Figure 1 , Figure 2 As shown, a flue gas temperature automatic control device includes a heat exchanger, wherein an inlet pipeline and an outlet pipeline are respectively provided on both sides of the heat exchanger, a heat exchanger inlet valve 2 is provided on the inlet pipeline, a heat exchanger inlet flue gas temperature monitor 1 is provided on the inlet pipeline, a heat exchanger outlet flue gas temperature monitor 4 is provided on the outlet pipeline, and a variable frequency fan 5 is provided at one end of the heat exchanger to adjust the fan frequency according to the temperature variable frequency.

[0019] A bypass pipeline is provided between the inlet pipeline and the outlet pipeline, the bypass pipeline is connected in parallel with the heat exchanger, and a heat exchanger bypass valve 3 is provided on the bypass pipeline.

[0020] The heat exchanger inlet valve 2 and the heat exchanger bypass valve 3 are both provided with an intelligent interlocking opening controller 7, which automatically adjusts the flue gas volume entering the heat exchanger and bypassing according to the set flue gas temperature.

[0021] The variable frequency fan 5 is provided with a fan frequency monitor 8, and the output ends of the intelligent interlocking opening controller 7 and the fan frequency monitor 8 are electrically connected to the flue gas temperature monitor.

[0022] A control cabinet 6 is provided on one side of the heat exchanger, and the intelligent interlocking opening controller 7 , the flue gas temperature monitor and the fan frequency monitor 8 are placed inside the control cabinet 6 .

[0023] Specifically, when in use, the temperature signal detected by the flue gas temperature monitor is transmitted to the intelligent interlocking opening controller 7 and the fan frequency monitor 8. The temperature difference is detected by the flue gas temperature monitor. When the flue gas temperature monitor detects a change in the outlet temperature of the heat exchanger, a feedback signal is given to the intelligent interlocking opening controller 7 and the fan frequency monitor 8. At this time, when the flue gas temperature monitor detects that the temperature is higher or lower than the temperature set by the instrument, the flue gas temperature monitor sends a signal to the intelligent interlocking opening controller 7 and the fan frequency monitor 8 through the output interface. The intelligent interlocking opening controller 7 will adjust the heat exchanger inlet valve 2 and the heat exchanger bypass valve 3 to control the amount of flue gas entering the heat exchanger for preliminary cooling. If the temperature is still not within the temperature range set by the instrument, the signal will be further given to the fan frequency monitor 8 to turn on the fan, thereby controlling the stability of the flue gas temperature at the outlet of the heat exchanger.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0025] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A flue gas temperature automatic control device, characterized in that: It includes a heat exchanger, wherein an inlet pipeline and an outlet pipeline are respectively arranged on both sides of the heat exchanger, a heat exchanger inlet valve is arranged on the inlet pipeline, and both the inlet pipeline and the outlet pipeline are provided with a temperature monitor, and a variable frequency fan is arranged at one end of the heat exchanger, and the fan frequency is adjusted according to the temperature variable frequency; A bypass pipeline is provided between the inlet pipeline and the outlet pipeline, the bypass pipeline is connected in parallel with the heat exchanger, and a heat exchanger bypass valve is provided on the bypass pipeline.

2. According to the flue gas temperature automatic control device described in claim 1, it is characterized by: The heat exchanger inlet valve and the heat exchanger bypass valve are both provided with an intelligent interlocking opening controller, the variable frequency fan is provided with a fan frequency monitor, and the output ends of the intelligent interlocking opening controller and the fan frequency monitor are electrically connected to the flue gas temperature monitor.

3. According to the automatic flue gas temperature control device of claim 2, it is characterized in that: A control cabinet is provided on one side of the heat exchanger, and the intelligent interlocking opening controller, the flue gas temperature monitor and the fan frequency monitor are placed inside the control cabinet.

Images