A desulfurization and dust removal test device

Abstract

A desulfurization and dust removal test device comprises a body absorbent circulating tank, a body absorbent circulating pump, an extended absorbent circulating tank, an extended absorbent circulating pump, an air inducing fan, an inlet section, a flow equalizing section, a lower spraying section, a liquid collecting section, an upper spraying section, a demisting and dust removal temperature adjusting section and an outlet section; the body absorbent circulating tank, the inlet section, the flow equalizing section, the lower spraying section, the liquid collecting section, the upper spraying section, the demisting and dust removal temperature adjusting section and the outlet section are detachably and sealingly connected from bottom to top and jointly surround to form a filtering channel. The desulfurization and dust removal test device can be modularly designed according to the field pilot scale, the components are connected through flanges, the field assembly and disassembly are very convenient, the device can be repeatedly used after quick assembly, the device can be transported to another project site after completing a project field test, and the investment waste of the test device which can only be used on site and once is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas treatment, in particular to a desulfurization and dust removal test device. BACKGROUND

[0002] With the increasingly severe environmental situation, the state has increased the control requirements of SO2 emission of coal-fired power plants, and has introduced a series of policies. Among them, the desulfurization reaches the ultra-low emission requirement (under the condition of 6% O2, SO2 concentration < 35 mg / m3, dust concentration < 5 mg / m3), and the desulfurization efficiency is usually more than 97%, and the dust removal efficiency is more than 80%. In recent years, in order to control the fuel cost, the sulfur and ash content of the coal used in the domestic coal-fired power plants is gradually increased, and the SO2 concentration of the flue gas at the inlet of the desulfurization device is continuously increased. In order to meet the ultra-low emission requirement, the desulfurization efficiency must also be increased to 98% or even more than 99%.

[0003] For the desulfurization and dust removal system with desulfurization efficiency more than 97% or SO2 emission concentration requirement, the related research and application have been made at home and abroad, and the main technologies include ammonia desulfurization technology, lime-gypsum wet desulfurization technology (or carbide slag-gypsum wet desulfurization technology), and limestone-gypsum wet tray tower technology, double-tower series desulfurization technology, single-tower double-circulation desulfurization technology and the like.

[0004] For different application scenarios, different flue gas loads and different flue gas conditions, it is necessary to select a most suitable desulfurization and dust removal process. However, it is difficult to achieve this purpose only by theoretical calculation and analysis. Many practices prove that the optimal technical process scheme recommended in the early theoretical analysis stage is often greatly discounted in the actual application stage. The main reason is that the decision maker of the technical scheme selection only judges the technical feasibility of the scheme by the application effect of similar projects, and finally selects the scheme with the lowest investment.

[0005] In fact, the best method to judge the technical feasibility of the technical scheme is to build a test device of the related technical process in the field, introduce the actual working condition flue gas, and perform the related test verification, so as to judge the optimal process scheme according to the test result. However, the test device is usually built once, and can only be used for testing one process. If other processes need to be replaced, it needs to be rebuilt. At the same time, the test device cannot be reused, and must be dismantled and scrapped after the test is completed. Therefore, the construction period is long, the investment is large, it does not have the practical application feasibility, and thus it is urgent to be improved. SUMMARY

[0006] The present application aims to overcome the above-mentioned deficiencies, and provides a desulfurization and dust removal test device, which can be used for on-site test of most of the current mainstream wet desulfurization and dust removal processes, is convenient to transport, install and disassemble, and can be applied to various flue gas desulfurization and dust removal on-site tests.

[0007] A desulfurization and dust removal test device, comprising a body absorbent circulating tank, a body absorbent circulating pump, an extended absorbent circulating tank, an extended absorbent circulating pump, an induced draft fan, an inlet section, a flow equalization section, a lower spray section, a liquid collection section, an upper spray section, a demisting and dust removal temperature adjustment section, and an outlet section; wherein the body absorbent circulating tank, the inlet section, the flow equalization section, the lower spray section, the liquid collection section, the upper spray section, the demisting and dust removal temperature adjustment section, and the outlet section are sequentially and detachably connected by flanges, a plurality of bolts, and a plurality of nut threads, and collectively form a filtering channel; the induced draft fan is arranged outside the body absorbent circulating tank and is connected to the inlet section by a pipeline; the induced draft fan is used to introduce external flue gas into the filtering channel; the flow equalization section is used to equalize the flow of flue gas; the body absorbent circulating tank contains absorbent; the body absorbent circulating pump is used to introduce the absorbent in the body absorbent circulating tank to the lower spray section; the extended absorbent circulating tank is connected to the body absorbent circulating tank; the extended absorbent circulating pump is used to introduce the absorbent in the extended absorbent circulating tank to the upper spray section; the lower spray section and the upper spray section spray absorbent to react with flue gas; the liquid collection section is used to recover the absorbent from the upper spray section; the liquid collection section is also provided with a reflux pipe connected to the extended absorbent circulating tank; the demisting and dust removal temperature adjustment section is used to demist, remove dust, and adjust the temperature of flue gas; and the outlet section is connected to an external flue to discharge flue gas.

[0008] As a preferred embodiment, the body absorbent circulating tank, the inlet section, the flow equalization section, the lower spray section, the liquid collection section, the upper spray section, the demisting and dust removal temperature adjustment section, and the outlet section are sequentially connected by flanges, a plurality of bolts, and a plurality of nut threads.

[0009] As a preferred embodiment, the body absorbent circulating tank and the extended absorbent circulating tank are each provided with a stirrer interface for connecting a stirrer to stir the absorbent in the body absorbent circulating tank and the extended absorbent circulating tank.

[0010] As a preferred embodiment, the desulfurization and dust removal test device further comprises at least one flow equalization member, each of which is arranged in the flow equalization section and is spaced apart along the extension direction of the filtering channel.

[0011] As a preferred embodiment, the lower spray section is provided with a lower spray layer connected to the output end of the body absorbent circulating pump; and the upper spray section is provided with an upper spray layer connected to the output end of the extended absorbent circulating tank.

[0012] As preferred: the liquid collecting section is provided with a liquid collecting cover, the liquid collecting cover adopts a gas-permeable waterproof structure, the liquid collecting cover is used to collect the absorbent sprayed out by the upper spraying section, and the bottom of the liquid collecting cover is also communicated with the extended absorbent circulating tank through the reflux pipe.

[0013] As preferred: the demisting and dust removal temperature adjusting section is provided with a demister, a dust remover and a temperature adjuster arranged in sequence from bottom to top.

[0014] As preferred: a first baffle door is arranged between the input end of the induced draft fan and the external smoke inlet pipeline, and a second baffle door is arranged between the outlet section and the pipeline of the external smoke exhaust duct.

[0015] With the above scheme, the beneficial effects of the present application are:

[0016] (1) Reusable, saving investment

[0017] The main body absorbent circulating tank, the inlet section, the flow equalizing section, the upper and lower spraying sections, the liquid collecting section, the demisting and dust removal temperature adjusting section and the outlet section are modularly designed according to the field pilot scale, the components are connected through flanges, and the field assembly and disassembly are very convenient. After completing a field test of a project, the project can be divided into parts for long-distance transportation to another project site, and after quick assembly, the project can be reused, avoiding the investment waste of the test device used only once in the original place.

[0018] (2) Flexible combination form, suitable for multiple desulfurization and dust removal processes

[0019] The flue gas desulfurization and dust removal test device can change the forms of the flow equalizing plate, the spraying layer, the demister, the dust remover and the temperature adjuster, change the types of absorbents, adjust the operating parameters under different working conditions of the flue gas flow and the circulating pump flow, and also can add or cancel the liquid collecting section. Through the modular function recombination, the flexible combination of multiple desulfurization and dust removal processes is realized, and the test verification of ammonia desulfurization technology, lime-gypsum wet desulfurization technology, limestone-gypsum wet desulfurization tray tower technology, double-tower series desulfurization technology, single-tower double-circulation desulfurization technology and other desulfurization and dust removal technologies is realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the desulfurization and dust removal test device.

[0021] Explanation of reference numerals in the attached drawings: 1. Main absorbent circulation tank; 2. Main absorbent circulation pump; 3. Extended absorbent circulation tank; 4. Extended absorbent circulation pump; 5. Exhaust fan; 6. Inlet section; 7. Flow equalization section; 8. Lower spray section; 9. Liquid collection section; 10. Upper spray section; 11. Demisting, dust removal, and temperature control section; 12. Outlet section; 13. Agitator interface; 14. Flow equalization component; 15. Liquid collection hood; 16. Return pipe; 17. Overflow pipe; 18. Bottom connecting pipe; 19. Upper spray layer; 20. Lower spray layer; 21. Demister; 22. Dust collector; 23. Temperature controller; 24. First baffle gate; 25. Second baffle gate. Detailed Implementation

[0022] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, a desulfurization and dust removal test device includes a main absorbent circulation tank 1, a main absorbent circulation pump 2, an extended absorbent circulation tank 3, an extended absorbent circulation pump 4, an induced draft fan 5, an inlet section 6, a flow equalization section 7, a lower spray section 8, a liquid collection section 9, an upper spray section 10, a demisting, dust removal, and temperature control section 11, and an outlet section 12. The main absorbent circulation tank 1, inlet section 6, flow equalization section 7, lower spray section 8, liquid collection section 9, upper spray section 10, demisting, dust removal, and temperature control section 11, and outlet section 12 are detachably and sealedly connected from bottom to top and together form a [structure / structure]. The filter channel allows the flue gas to be filtered and purified within it. The absorbent circulation tank 1, inlet section 6, flow equalization section 7, lower spray section 8, liquid collection section 9, upper spray section 10, demisting, dust removal and temperature control section 11, and outlet section 12 are connected in various ways from bottom to top. These detachable connections can be made using screw fastening, snap-fit, or other detachable connection methods. In addition, there are various sealing methods for sealing the connection points, such as using sealing gaskets or applying sealant to the connection points.

[0025] The induced draft fan 5 is arranged outside the body absorbent circulating tank 1 and is communicated with the inlet section 6 through a pipeline. The induced draft fan 5 is used to introduce the external flue gas into the filtering channel. For example, the induced draft fan 5 is connected with the main flue, and the flue gas in the main flue is introduced into the filtering channel through the inlet section 6. In addition, flue gas flow detection instruments, pressure detection instruments, temperature detection instruments and gas composition detection instruments can also be arranged on the connecting flue, so that the engineers can know the various parameters of the flue gas introduced into the filtering channel.

[0026] Further, the flow equalization section 7 is arranged on the upper portion of the inlet section 6. The flow equalization section 7 is used to equalize the flow of the flue gas. The body absorbent circulating tank 1 contains absorbent. The body absorbent circulating pump 2 is used to introduce the absorbent in the body absorbent circulating tank 1 to the lower spraying section 8. The extended absorbent circulating tank 3 is arranged in communication with the body absorbent circulating tank 1. Specifically, the extended absorbent circulating tank 3 is connected with the absorbent in the body absorbent circulating tank 1 through the overflow pipe 17 and the bottom connecting pipe 18.

[0027] The extended absorbent circulating pump 4 is used to introduce the absorbent in the extended absorbent circulating tank 3 to the upper spraying section 10. The lower spraying section 8 and the upper spraying section 10 spray the absorbent to make the absorbent react with the flue gas. According to the requirements of the test work, one layer of spraying layer or multiple layers of spraying layer can be arranged in the lower spraying section 8 and the upper spraying section 10. Each spraying layer can adopt the form of empty tower plus spraying layer or the form of filler plus spraying layer, which is not limited here. The liquid collecting section 9 is arranged on the upper portion of the lower spraying section 8. The liquid collecting section 9 is used to recover the absorbent of the upper spraying section 10. The liquid collecting section 9 is also provided with a reflux pipe 16 arranged in communication with the extended absorbent circulating tank 3. The demisting and dust removal temperature adjusting section 11 is used to demist, remove dust and adjust the temperature of the flue gas. The outlet section 12 is arranged in communication with the external flue to discharge the flue gas.

[0028] In this way, the body absorbent circulating tank 1, the inlet section 6, the flow equalization section 7, the upper and lower spraying sections 8, the liquid collecting section 9, the demisting and dust removal temperature adjusting section 11 and the outlet section 12 are modularly designed according to the field test scale. The field loading and unloading is very convenient. After completing the field test of a project, the test device can be transported to another project site for reuse after quick assembly, avoiding the investment waste of one-time use of the test device on site.

[0029] Example two

[0030] On the basis of the first embodiment, in order to make the connection between the body absorbent circulating tank 1, the inlet section 6, the flow equalizing section 7, the lower spraying section 8, the liquid collecting section 9, the upper spraying section 10, the mist and dust removing and temperature adjusting section 11 and the outlet section 12 more convenient, higher in disassembly and more firm after connection, the body absorbent circulating tank 1, the inlet section 6, the flow equalizing section 7, the lower spraying section 8, the liquid collecting section 9, the upper spraying section 10, the mist and dust removing and temperature adjusting section 11 and the outlet section 12 are connected in sequence by the flange, the plurality of bolts and the threaded connection of the plurality of nuts, and the sealing rubber gasket is arranged between the upper and lower flanges. When the upper and lower flanges are connected by the locking of the bolts and the nuts, the sealing rubber gasket at the connection can be extruded to make the connection have better sealing property.

[0031] In addition, in order to avoid the precipitation of the absorbent in the body absorbent circulating tank 1 and the extended absorbent circulating tank 3, the surface of the body absorbent circulating tank 1 and the extended absorbent circulating tank 3 is provided with the agitator interface 13. The two agitator interfaces 13 are used to be connected with the agitator to stir the absorbent in the body absorbent circulating tank 1 and the extended absorbent circulating tank 3.

[0032] In addition, the body absorbent circulating tank 1 and the extended absorbent circulating tank 3 can be provided with the absorbent supplement port to be filled when the absorbent is insufficient. The body absorbent circulating tank 1 and the extended absorbent circulating tank 3 can be provided with the oxidizing air inlet port. The oxidizing air can be introduced when necessary to oxidize and aerate the absorbent.

[0033] Further, the desulfurization and dust removal test device further comprises at least one flow equalizing member 14. Each flow equalizing member 14 is arranged in the flow equalizing section 7 and is arranged in intervals along the extension direction of the filter channel. The number and form of the flow equalizing member 14 are designed and installed according to the test requirements, which are not limited here.

[0034] The lower spraying section 8 is provided with the lower spraying layer 20 which is in communication with the output end of the body absorbent circulating pump 2. The upper spraying section 10 is provided with the upper spraying layer 19 which is in communication with the output end of the extended absorbent circulating tank 3. In this way, the absorbent sprayed from the spraying layer flows downward to the body absorbent circulating tank 1 after being contacted with the flue gas to perform the circulation flow.

[0035] In order for the absorbent sprayed by the upper spraying section 10 to flow into the lower spraying section 8, in this embodiment, the bottom of the liquid collecting cover 15 has a liquid collecting disc to collect the absorbent flowing down from the upper spraying section 10. The liquid collecting cover 15 adopts a breathable waterproof structure. The liquid collecting cover 15 is used to collect the absorbent sprayed from the upper spraying section 10. The bottom of the liquid collecting cover 15 is further in communication with the extended absorbent circulating tank 3 through the backflow pipe 16. In this way, the absorbent flows into the extended absorbent circulating tank 3 through the backflow pipe 16 and will not enter the lower spraying section 8. The liquid collecting cover 15 is arranged in the liquid collecting section 9 of the lower spraying section 8.

[0036] Further, the absorbent enters the spray layer of the upper spray section 10 through the extension absorbent circulating pump 4, is sprayed from the spray layer, contacts the flue gas, and then flows downward into the collecting section 9. The collecting cover 15 collects the absorbent, which then flows back to the extension absorbent circulating tank 3 through the backflow pipe 16, and circulates.

[0037] The demisting and dust-removing temperature-adjusting section 11 is arranged above the upper spray section 10. The demisting and dust-removing temperature-adjusting section 11 is provided with a demister 21, a dust remover 22, and a temperature adjuster 23 arranged from bottom to top. The demister 21 can be in various forms such as flat plate type, ridge type, wire mesh type, and cyclone plate type, and can be arranged in one or two layers. The dust remover 22 can be in the form of wet electrostatic dust removal or tube bundle dust removal. The temperature adjuster 23 is internally provided with a cavity heat exchange pipe structure such as a tube type or a coil type. The heat exchange pipe is connected to an external heat exchange medium through an interface extending out of the demisting and dust-removing temperature-adjusting section 11. The heat exchange pipe can be connected to hot water, steam, cold water, or other heat exchange medium, so that the temperature adjuster 23 exchanges heat with the flue gas, thereby adjusting the temperature of the flue gas flowing through the temperature adjuster 23.

[0038] In addition, a first baffle door 24 is arranged between the input end of the induced draft fan 5 and the external flue gas inlet pipe, and a second baffle door 25 is arranged between the outlet section 12 and the external flue gas outlet pipe, so that the flue can be immediately closed or opened.

Claims

1. A desulfurization and dedusting test device, characterized in that: The desulfurization and dust removal test device comprises a body absorbent circulating tank (1), a body absorbent circulating pump (2), an extended absorbent circulating tank (3), an extended absorbent circulating pump (4), a draft fan (5), an inlet section (6), a flow equalization section (7), a lower spray section (8), a liquid collecting section (9), an upper spray section (10), a demisting and dust removal temperature adjustment section (11), and an outlet section (12); wherein the body absorbent circulating tank (1), the inlet section (6), the flow equalization section (7), the lower spray section (8), the liquid collecting section (9), the upper spray section (10), the demisting and dust removal temperature adjustment section (11), and the outlet section (12) are sequentially and detachably connected by flanges, a plurality of bolts, and a plurality of nut threads, and collectively form a filtering channel; the draft fan (5) is arranged outside the body absorbent circulating tank (1) and is in communication with the inlet section (6) through a pipeline; the draft fan (5) is used to introduce external flue gas into the filtering channel; the flow equalization section (7) is used to equalize the flow of the flue gas; the body absorbent circulating tank (1) contains absorbent; the body absorbent circulating pump (2) is used to introduce the absorbent in the body absorbent circulating tank (1) to the lower spray section (8); the extended absorbent circulating tank (3) is in communication with the body absorbent circulating tank (1); the extended absorbent circulating pump (4) is used to introduce the absorbent in the extended absorbent circulating tank (3) to the upper spray section (10); the lower spray section (8) and the upper spray section (10) spray the absorbent to react with the flue gas; the liquid collecting section (9) is used to recover the absorbent of the upper spray section (10); the liquid collecting section (9) is further provided with a backflow pipe (16) in communication with the extended absorbent circulating tank (3); the demisting and dust removal temperature adjustment section (11) is used to demist, remove dust, and adjust the temperature of the flue gas; the outlet section (12) is in communication with an external flue to discharge the flue gas; the body absorbent circulating tank (1), the inlet section (6), the flow equalization section (7), the lower spray section (8), the liquid collecting section (9), the upper spray section (10), the demisting and dust removal temperature adjustment section (11), and the outlet section (12) are sequentially connected by flanges, a plurality of bolts, and a plurality of nut threads; the liquid collecting section (9) is provided with a liquid collecting cover (15) having a breathable and waterproof structure; the liquid collecting cover (15) is used to collect the absorbent sprayed by the upper spray section (10); the bottom of the liquid collecting cover (15) is further in communication with the extended absorbent circulating tank (3) through the backflow pipe (16).

2. The desulfurization and dust removal test apparatus according to claim 1, characterized by: The body absorbent circulating tank (1) and the extended absorbent circulating tank (3) are both provided with stirrer interfaces (13) for connecting with stirrers to stir the absorbent in the body absorbent circulating tank (1) and the extended absorbent circulating tank (3).

3. The desulfurization and dust removal test apparatus according to claim 1, characterized by: The desulfurization and dust removal test device further comprises at least one flow equalizing member (14), each of the flow equalizing members (14) is arranged in the flow equalizing section (7) and is arranged at intervals along the extension direction of the filtering passage.

4. The desulfurization and dust removal test apparatus according to claim 1, characterized by: The lower spraying section (8) is provided with a lower spraying layer (20) which is arranged in communication with the output end of the body absorbent circulating pump (2); the upper spraying section (10) is provided with an upper spraying layer (19) which is arranged in communication with the output end of the extended absorbent circulating groove (3).

5. The desulfurization and dust removal test apparatus according to claim 1, characterized by: The demisting and dust removal temperature adjusting section (11) is provided with a demister (21), a dust remover (22) and a temperature adjuster (23) arranged in sequence from bottom to top.

6. The desulfurization and dust removal test apparatus according to claim 1, characterized by: The input end of the air inducing fan (5) and the external smoke inlet pipeline are provided with a first baffle door (24), and the outlet section (12) and the pipeline of the external smoke outlet duct are provided with a second baffle door (25).

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