Method and equipment for dust-free production of building gypsum powder

Abstract

The application belongs to the technical field of atmospheric dust pollution control, and particularly relates to a building gypsum powder dust-free production method and equipment, which comprises a gypsum powder production line, the gypsum powder production line comprises a beneficiation module, a calcination module, a crushing module, a separation module and a purification module, the purification module comprises a dust removal assembly and a desulfurization assembly, the dust removal assembly is used for dust removal treatment of flue gas generated in the production process, and then the flue gas is sent to the desulfurization assembly for desulfurization purification treatment; a cleaning cavity is arranged in the partition plate of the bag dust removal equipment, dry hot air flow is filled into the cleaning cavity at a fixed time, the humidity of the dust removal filter bag is reduced, the smoke dust impurities adhered to the dust removal filter bag are difficult to absorb water and block, the cleaning is more smooth under the action of the blowing air flow, the good passability is ensured, the dust-free purification operation of the flue gas generated in the building gypsum powder production process is smoothly carried out, the pollution to the atmospheric environment is reduced, and the processing environment of the operators is further improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of atmospheric dust pollution control, and in particular to a dust-free production method and equipment for building gypsum powder. BACKGROUND

[0002] Gypsum powder is one of the five gel materials, which is made of gypsum through a series of processes such as crushing and grinding, and is widely used in building, building materials, industrial molds and artistic models, chemical industry, agriculture, food processing, medicine and beauty, etc. It is an important industrial raw material.

[0003] Building gypsum powder is mainly composed of gypsum, water and additives. Although it looks very simple, it is still classified as a dangerous chemical. The reason is that building gypsum powder can produce dust during processing, use and transportation, which can affect human health. Long-term exposure to building gypsum powder dust can cause respiratory diseases, skin inflammation and digestive problems.

[0004] Therefore, in the crushing, calcination and drying processes of building gypsum powder production, a large amount of flue gas generated needs to be purified to remove dust impurities, reduce environmental pollution and improve the processing environment. The commonly used dust purification equipment is a pulse bag dust collector, which is a dust removal device that uses a bag filter element made of fiber to capture solid particles in dust-containing gas. Its working principle is that dust particles collide with fibers due to inertial force when passing through filter fibers and are intercepted.

[0005] However, in the process of use, the operator found that because the gypsum raw material contains moisture, the flue gas generated during calcination and drying process contacts the dust removal filter bag inside the pulse bag dust collector during the purification process. Part of the moisture in the flue gas will remain inside the dust removal filter bag during the contact process, which can easily increase the humidity inside the dust removal filter bag, causing the dust adhered to the surface to clump due to moisture, increasing the difficulty of pulse blowing cleaning, affecting the passage of the dust removal filter bag, and hindering the smooth progress of the dust removal filter bag. The purification operation of dust and impurities in flue gas. SUMMARY

[0006] In order to make up for the shortcomings of the prior art and solve the above technical problems, the present application provides a dust-free production method and equipment for building gypsum powder.

[0007] The technical scheme adopted by the present application to solve its technical problems is: the present application provides a dust-free production equipment for building gypsum powder, which includes a gypsum powder production line. The gypsum powder production line includes an ore dressing module, a calcination module, a crushing module, a sorting module and a purification module. The purification module is used to purify the flue gas generated during the production of building gypsum powder.

[0008] The purification module comprises a dust removal assembly and a desulfurization assembly, the dust removal assembly is used to remove dust from flue gas generated in the production process, and then the flue gas is sent to the desulfurization assembly for desulfurization purification treatment;

[0009] The dust removal assembly comprises a bag dust removal device and a wet ash pool, the bag dust removal device comprises a body, a purification cavity and an air outlet cavity are arranged in the body, and the purification cavity and the air outlet cavity are separated by a partition plate; an air inlet pipe is arranged on the side wall of the purification cavity, an air outlet pipe is arranged on the side wall of the air outlet cavity, and the air outlet pipe is communicated with the desulfurization assembly; a venturi pipe is uniformly arranged on the partition plate, and the venturi pipe is used to communicate the purification cavity and the air outlet cavity;

[0010] A fixed framework is arranged on the lower side of the venturi pipe, a dust removal filter bag is wrapped and fixed outside the fixed framework, a blowing pipe is arranged inside the purification cavity at a position on the upper side of the partition plate, the blowing pipe is communicated with a pulse air supply assembly, and pulse blowing cleaning of the dust removal filter bag is realized;

[0011] An ash outlet is arranged at the bottom of the purification cavity, an ash discharge device is arranged in the ash outlet, and the wet ash pool is communicated with the ash outlet; a cleaning cavity is arranged in the partition plate, and the cleaning cavity is communicated with a heat source outside; a flushing hole is arranged at the bottom of the cleaning cavity and opposite to a part of the outer surface of the dust removal filter bag, and dry hot air flow is released from the flushing hole to flush the outer surface of the dust removal filter bag to clean the outer surface of the dust removal filter bag.

[0012] Preferably, a flushing pipe is arranged in the flushing hole, the flushing pipe is vertically arranged, the bottom of the flushing pipe extends downward to a position close to the bottom of the dust removal filter bag, and cleaning holes are uniformly arranged on the side wall of the flushing pipe and directed to the part of the outer surface of the dust removal filter bag.

[0013] Preferably, an ash discharge pipe is arranged on the lower side of the flushing pipe, the ash discharge pipe is vertically arranged, the bottom of the ash discharge pipe extends to a position below the opening of the air inlet pipe and close to the ash outlet at the bottom, the top opening of the ash discharge pipe is conically arranged, and is opposite to the lower side of the dust removal filter bag.

[0014] Preferably, a cleaning ring is uniformly arranged outside the dust removal filter bag, the cleaning ring is connected with the outer surface of the flushing pipe, and a scraping block is arranged on the inner surface of the cleaning ring and opposite to the surface of the dust removal filter bag; the conical end of the scraping block is in contact with the outer surface of the surface of the dust removal filter bag.

[0015] The flushing pipe and the inner wall of the flushing hole are in sliding connection, the top of the flushing pipe is connected with the inner wall of the top of the flushing hole through a spring; the bottom of the ash discharge pipe is slidingly embedded in a limiting ring, the limiting ring is connected with the inner wall of the cleaning cavity, and the movement track of the ash discharge pipe is limited.

[0016] Preferably, the inner wall of the cleaning ring is provided with an annular groove at the position above the scraping blocks, and the scraping blocks are uniformly distributed on the upper and lower sides of the annular groove; the annular groove is annularly arranged around the middle axis of the dust removal filter bag, and the annular groove is communicated with the corresponding cleaning hole.

[0017] Preferably, the scraping block is provided with a flow guide groove, one end of the flow guide groove is communicated with the annular groove, and the other end extends to the end of the scraping block.

[0018] Preferably, the flushing pipe is elastically arranged, and the flushing pipe is internally provided with a vibrator controlled by an external controller.

[0019] Preferably, the fixed framework is vertically provided with an impact pipe, the impact pipe is annularly distributed around the central axis of the dust removal filter bag, and is in contact with the inner surface of the dust removal filter bag, thereby supporting and limiting the dust removal filter bag;

[0020] The top of the impact pipe is communicated with the inside of the cleaning cavity, and the impact hole is arranged on the side wall of the impact pipe and faces the inner surface of the dust removal filter bag, and the impact hole is inclined downward.

[0021] Preferably, the blowing pipe is communicated with the inside of the cleaning cavity through a connecting pipe.

[0022] A dust-free production method of building gypsum powder, the production method uses the above production equipment, and the production method comprises the following steps:

[0023] S1: After being mined, the gypsum ore needs to be processed by a beneficiation module, the beneficiation module crushes the gypsum ore, separates the gypsum ore with a particle size meeting the processing requirements into a gypsum powder production line, and the gypsum ore with a particle size not meeting the requirements needs to be crushed and screened again;

[0024] S2: The calcination equipment of the calcination module in the gypsum powder production line will perform calcination treatment on the beneficiation gypsum ore, the calcination temperature is 140-180 DEG C, the duration is 5-6 hours, and the water content in the gypsum ore is adjusted during the calcination process to meet the requirements, and finally the gypsum semi-product is obtained;

[0025] S3: The gypsum semi-product is processed into powder by a gypsum powder special mill in the crushing module, and then the gypsum powder with a particle size meeting the requirements is separated out through a screen, cooperates with a vibrating screen of a sorting module to remove large particles of gypsum, and under the action of a drying equipment, the water content in the gypsum powder is continuously adjusted to meet the requirements of the finished product, and then the gypsum powder is packaged and shipped out;

[0026] S4: In the above production process, the calcining equipment and drying equipment in the gypsum powder production line are communicated with the dust removal assembly of the purification module, the generated waste gas is purified by the dust removal assembly to remove the dust impurities therein, then passes through the water bath desulfurization tower in the desulfurization assembly to remove the sulfur-containing pollutants therein, so that the generated waste gas reaches the emission standard, and dust-free production is realized.

[0027] The beneficial effects of the present application are as follows:

[0028] The cleaning cavity is arranged in the partition plate of the bag-type dust removal equipment, so that when the permeability of the dust removal filter bag is affected, dry hot air flow is filled into the cleaning cavity for a period of time, the hot air flow flows downward through the scouring holes distributed in a ring around the dust removal filter bag, surrounds and contacts the outer surface of the dust removal filter bag, accelerates the falling of the dust and impurities adhered to the outer surface of the dust removal filter bag, reduces the humidity of the dust removal filter bag, and makes it difficult for the dust and impurities adhered to the dust removal filter bag to absorb water and form a block, so as to facilitate the cleaning of the dust removal filter bag under the action of the blowing air flow, ensure good permeability, and ensure the smooth operation of the dust-free purification operation of the flue gas generated in the building gypsum powder production process, reduce the pollution to the atmospheric environment, and further improve the processing environment of the operators. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below with reference to the accompanying drawings.

[0030] Figure 1 is a perspective view of the dust-free production equipment in the present application;

[0031] Figure 2 is a sectional view of the dust-free production equipment in the present application;

[0032] Figure 3 is Figure 2 is a partial enlarged view of A in the present application;

[0033] Figure 4 is Figure 3 is a partial enlarged view of B in the present application;

[0034] Figure 5 is a schematic view of the scouring pipe and the dust removal filter bag cooperating in the present application;

[0035] Figure 6 is a sectional view of the scouring pipe and the dust removal filter bag in the present application;

[0036] Figure 7 is Figure 6 is a partial enlarged view of C in the present application;

[0037] Figure 8 is a schematic view of the scouring pipe and the cleaning ring cooperating in the present application;

[0038] Figure 9 is a flow chart of the dust-free production method in the present application.

[0039] In the figure: bag dust removal equipment 1, body 11, purification cavity 12, air inlet pipe 121, ash outlet 122, air outlet cavity 13, air outlet pipe 131, partition 14, venturi 141, fixed framework 15, impact pipe 151, impact hole 152, dust removal filter bag 16, blowing pipe 2, pulse air supply assembly 21, connecting pipe 22, cleaning cavity 3, flushing hole 31, flushing pipe 32, cleaning hole 321, ash discharge pipe 33, limiting ring 331, cleaning ring 34, annular groove 341, scraper 35, flow guide groove 351. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] Embodiment one:

[0042] As shown in the drawings of the specification Figures 1-8 A dust-free production equipment for building gypsum powder includes a beneficiation module, a calcination module, a crushing module, a sorting module, and a purification module. The purification module is used to purify the flue gas generated during the production process of the building gypsum powder.

[0043] The purification module includes a dust removal assembly and a desulfurization assembly. The dust removal assembly is used to remove dust from the flue gas generated during the production process, and then the flue gas is sent to the water bath desulfurization tower in the desulfurization assembly for desulfurization purification treatment.

[0044] The dust removal assembly includes a bag dust removal equipment 1 and a wet ash pond. The bag dust removal equipment 1 includes a body 11. The body 11 is internally provided with a purification cavity 12 and an air outlet cavity 13. The purification cavity 12 and the air outlet cavity 13 are separated by a partition 14. The side wall of the purification cavity 12 is provided with an air inlet pipe 121, and the side wall of the air outlet cavity 13 is provided with an air outlet pipe 131. The air outlet pipe 131 is communicated with the desulfurization assembly. The partition 14 is uniformly provided with a venturi 141, which communicates the purification cavity 12 and the air outlet cavity 13.

[0045] The venturi 141 is provided with a fixed framework 15 on the lower side. The fixed framework 15 is wrapped with a dust removal filter bag 16. The inside of the purification cavity 12 is provided with a blowing pipe 2 at the upper side of the partition 14. The blowing pipe 2 is communicated with a pulse air supply assembly 21. The pulse air supply assembly 21 includes existing electromagnetic pulse valves, air bags, controllers, and other equipment. The time can be set, and periodic airflow impact can be realized according to the set frequency to realize pulse blowing cleaning of the dust removal filter bag 16.

[0046] An ash outlet 122 is provided at the bottom of the purification chamber 12, and an ash discharge device is provided inside the ash outlet 122. The wet ash water pool is communicated with the ash outlet 122. The ash outlet 122 can be connected to the upper side of the wet ash water pool through a pipe, or the wet ash water pool can be directly installed on the lower side of the ash outlet 122 to realize the recovery and treatment of the discharged smoke and reduce the atmospheric dust pollution caused by the diffusion of smoke during the recovery process; a cleaning chamber 3 is provided inside the partition 14, and the cleaning chamber 3 is communicated with the external heat source, and the heat source here can be an existing hot air blower for drying; a flushing hole 31 is provided at the bottom of the cleaning chamber 3 facing the outer surface of the dust filter bag 16, and the flushing hole 31 releases a dry hot air flow to flush the outer surface of the dust filter bag 16 to clean the outer surface of the dust filter bag 16.

[0047] Specific work flow: After gypsum ore is mined, it needs to be processed by the mineral processing module. The mineral processing module crushes the gypsum ore and separates the gypsum ore with a particle size that meets the processing requirements and enters the gypsum powder production line. The gypsum ore that does not meet the particle size requirements needs to be crushed and screened again;

[0048] The calcination equipment of the calcination module in the gypsum powder production line will calcine the gypsum ore after beneficiation at a temperature of 140℃-180℃ for 5-6 hours. During the calcination process, the moisture content in the gypsum ore will be adjusted to meet the requirements, and the final gypsum semi-finished product will be obtained;

[0049] The semi-finished gypsum product will be processed into powder by the gypsum powder grinding machine in the crushing module. The gypsum powder with the required particle size will be separated through a screen. The vibrating screen in the sorting module will remove the large gypsum particles. The moisture content of the gypsum powder will be further adjusted by the drying equipment to meet the requirements of the finished product. It will then be packaged and shipped.

[0050] In the above production process, the flue gas generated by the processing and production in the calcination module, crushing module, sorting module and other parts is sent to the air inlet pipe 121, and then sent to the interior of the purification chamber 12. The flue gas flows from bottom to top, and after being blocked by the partition 14, it contacts the dust filter bag 16 and penetrates into the dust filter bag 16, and then passes upward through the top venturi 141 into the air outlet chamber 13 on the upper side of the partition 14. In this process, the powder impurities in the flue gas are blocked on the outside of the dust filter bag 16, thereby achieving the purification of the flue gas; after entering the interior of the air outlet chamber 13, the flue gas flows out through the air outlet pipe 131 and enters the desulfurization component for further desulfurization and purification treatment until the impurity content in the flue gas reaches the emission standard and can be discharged normally. This effectively reduces the pollution of the surrounding atmospheric production environment during the production of building gypsum powder, improves the processing environment of the operators, and is more in line with the theme of energy conservation and environmental protection;

[0051] In the production process, the dust and impurities cleaned from the outer surface of the dust removal filter bag 16 fall to the bottom ash outlet 122 under the action of gravity, and then are discharged to the outside wet ash pool through the ash discharge device, so that the separated dust and impurities are effectively treated; the blowing pipe 2 periodically releases the blowing gas flow at a set time frequency through the communicating pulse gas supply assembly 21, and the blowing gas flow acts downward on the dust removal filter bag 16, so that the dust removal filter bag 16 is subjected to the airflow impact from the inside to the outside, and the falling of the dust and impurities adhered to the outer surface of the dust removal filter bag 16 is accelerated, thereby ensuring that the dust removal filter bag 16 can normally function;

[0052] Further, because the building gypsum powder needs to be dried and dehumidified in the process of adjusting the humidity of the building gypsum powder, a large amount of water may be contained in the discharged flue gas, which may cause the humidity of the dust removal filter bag 16 to increase, the humidity of the dust adhered to the surface to increase, the dust to be tightly adhered to the outer surface of the dust removal filter bag 16, and the permeability of the dust removal filter bag 16 to be affected;

[0053] Therefore, the cleaning cavity 3 is arranged inside the partition plate 14, so that when the permeability of the dust removal filter bag 16 is affected, dry hot gas flow is filled into the cleaning cavity 3 for a period of time, the hot gas flow flows downward through the washing holes 31 arranged in a ring around the dust removal filter bag 16, surrounds the outer surface of the dust removal filter bag 16, and accelerates the falling of the dust and impurities adhered to the outer surface of the dust removal filter bag 16 while the heating action of the hot gas flow increases the temperature of the dust removal filter bag 16, prevents the water in the flue gas from being liquefied and accumulated in the dust removal filter bag 16, thereby reducing the humidity of the dust removal filter bag 16, making it difficult for the dust and impurities adhered to the dust removal filter bag 16 to be water-absorbed and caked, and thereby promoting the dust removal filter bag 16 to be smoothly cleaned under the action of the blowing gas flow, ensuring good permeability and smooth operation of the dust-free purification of the flue gas generated in the building gypsum powder production process, reducing the pollution to the atmospheric environment, and further improving the processing environment of the operators.

[0054] Example Two:

[0055] On the basis of example one, the washing pipe 32 is arranged inside the washing hole 31, the washing pipe 32 is vertically arranged, and the bottom of the washing pipe 32 extends downward to a position close to the bottom of the dust removal filter bag 16, and the side wall of the washing pipe 32 is uniformly provided with cleaning holes 321 pointing to the position of the outer surface of the dust removal filter bag 16;

[0056] Specific workflow: on the basis of the specific workflow in embodiment one, in order to improve the cleaning effect when the dust removal filter bag 16 is dried and cleaned, the flushing pipe 32 is arranged, so that the dry hot gas flow flows out through the flushing hole 31 and enters the flushing pipe 32, and is concentrated to the position close to the bottom of the dust removal filter bag 16 under the restriction and guidance of the flushing pipe 32; in this process, the dry hot gas flow flows out from the cleaning hole 321 on the side wall of the flushing pipe 32 and uniformly acts on the outer surface of the dust removal filter bag 16, so that the dust removal filter bag 16 is more fully subjected to the flow flushing action of the dry and dehumidified gas flow, the dry hot gas flow is reduced, and it fully surrounds the whole dust removal filter bag 16, improves the utilization rate of the dry hot gas flow, and ensures that the dust removal filter bag 16 can normally perform flue gas purification treatment after being fully cleaned.

[0057] Embodiment three:

[0058] On the basis of embodiment two, the dust removal pipe 33 is fixedly arranged at the lower side of the flushing pipe 32, the dust removal pipe 33 is vertically arranged, the bottom of the dust removal pipe 33 extends to the position below the opening of the air inlet pipe 121, and the dust outlet 122 close to the bottom; the top opening of the dust removal pipe 33 is conically arranged and faces the lower side of the dust removal filter bag 16.

[0059] Specific workflow: on the basis of the specific workflow in embodiment three, in the normal flue gas purification process, the flue gas flowing out of the air inlet pipe 121 forms a concentrated upward air flow in the purification cavity 12, which causes the dust and impurities falling on the surface of the dust removal filter bag 16 to be affected by the upward air flow when falling, so that the cleaned dust and impurities are difficult to fully enter the dust outlet 122 and flow to the outside; therefore, the dust removal pipe 33 is arranged, so that the top opening of the dust removal pipe 33 faces the bottom of the dust removal filter bag 16, so that the impurities adhering to the surface of the dust removal filter bag 16 fall, and the downward hot gas flow released by the annularly distributed flushing pipe 32 around the dust removal filter bag 16 causes the falling impurities on the dust removal filter bag 16 to enter the inside of the facing dust removal pipe 33 through the central surrounding area of the flushing pipe 32, and then move downward along the downward air flow in the inside of the dust removal pipe 33;

[0060] In this process, the dust removal pipe 33 shields the influence of the upward flowing flue gas from the outside, so that the dust and impurities entering the inside of the dust removal pipe 33 flow downward smoothly, then pass through the position of the air inlet pipe 121, enter the position close to the dust outlet 122 at the bottom, and can more smoothly enter the dust outlet 122, realize effective collection and discharge of the cleaned impurities on the dust removal filter bag 16, reduce the content of the scattered dust and impurities in the cleaning cavity 3, and at the same time without affecting the normal contact of the upward flue gas with the dust removal filter bag 16, the cleaning operation of the dust removal filter bag 16 is more effective and sufficient, and the problem of the cleaned impurities adhering to the dust removal filter bag 16 again is reduced.

[0061] Example 4:

[0062] On the basis of the third embodiment, a cleaning ring 34 is provided on the outside of the dust filter bag 16. The cleaning rings 34 are evenly distributed in the vertical direction. The cleaning rings 34 are connected to the outer surface of the flushing pipe 32. In this way, the cleaning rings 34 and the flushing pipe 32 cooperate to form a cage-like structure on the outside of the dust filter bag 16, limiting the dust filter bag 16 from the outside, reducing the deformation of the dust filter bag 16 under the impact of external smoke, which affects its normal operation; a scraper 35 is provided on the inner surface of the cleaning ring 34 facing the surface of the dust filter bag 16;

[0063] The flushing pipe 32 is slidably connected to the inner wall of the flushing hole 31, and the top of the flushing pipe 32 is connected to the inner wall of the flushing hole 31 by a spring; the bottom of the ash discharge pipe 33 is slidably embedded in the limit ring 331, and the limit ring 331 is connected to the inner wall of the cleaning chamber 3 by a connecting rod to limit the movement trajectory of the ash discharge pipe 33; an annular groove 341 is provided on the inner wall of the cleaning ring 34 at the upper side of the scraper block 35, and the scraper blocks 35 are evenly distributed on the upper and lower sides of the annular groove 341; the annular groove 341 is arranged around the middle axis of the dust filter bag 16 in the middle, and the annular groove 341 is communicated with the cleaning hole 321;

[0064] A guide groove 351 is provided on the scraper block 35, one end of the guide groove 351 is connected to the annular groove 341, and the other end extends to the end of the scraper block 35; the flushing tube 32 is elastically set, and a vibrator is provided inside the flushing tube 32. The vibrator here uses an existing micro-vibration motor, and the vibrator is controlled by an external controller.

[0065] Specific working process: On the basis of the specific working process in Example 3, in order to improve the cleaning effect of the dust filter bag 16, the flushing pipe 32 is set to a sliding setting. When the blowing pipe 2 is started, a short-term impact airflow is formed downward, which impacts the dust filter bag 16 on the lower side, causing the impurities adhering to the dust filter bag 16 to fall downward into the dust discharge pipe 33. At the same time, the impact effect causes the dust discharge pipe 33 to also be subjected to a downward impact force and drives the connected flushing pipe 32 to move downward; the downward movement of the flushing pipe 32 drives the cleaning ring 34 to move downward, and the downward moving cleaning ring 34 drives the scraper 35 on the inner ring surface to contact and scrape the outer surface of the dust filter bag 16, so that the dust and impurities adhering to the outer surface of the dust filter bag 16 are accelerated to fall off;

[0066] Furthermore, the contact and impact of the tapered end of the scraper 35 on the impurities on the surface of the dust filter bag 16 that may have agglomerated due to water absorption will also cause the agglomerated impurities on the surface of the dust filter bag 16 to be broken due to the impact. Subsequently, the impurities will fall into the ash discharge pipe 33 on the lower side under the impact of the downward airflow and be recovered. This makes the dust filter bag 16 cleaned more fully and thoroughly, ensuring the smooth progress of the subsequent flue gas purification operation.

[0067] Further, the vibrator arranged inside the flushing pipe 32 drives the elastic flushing pipe 32 to vibrate after starting, so as to drive the scraping block 35 on the flushing pipe 32 to scrape and remove the dust on the outer surface of the dust removal filter bag 16 while vibrating and impacting the outer surface of the dust removal filter bag 16, so that the agglomerated impurities on the outer surface of the dust removal filter bag 16 are broken and accelerated to fall off under the impact vibration; the cleaning hole 321 is opposite to the annular groove 341 on the cleaning ring 34, so that the airflow flowing out of the cleaning hole 321 enters the annular groove 341, flows along the annular groove 341 around the dust removal filter bag 16, and flushes the outer surface of the dust removal filter bag 16, so that the cleaning effect on the dust removal filter bag 16 is more comprehensive.

[0068] The airflow flowing in the annular groove 341 also flows to the end position of the scraping block 35, and the airflow acts on the contact gap between the scraping block 35 and the dust removal filter bag 16 while the scraping block 35 scrapes the outer surface of the dust removal filter bag 16, so that the impurities and dust scraped off are accelerated to leave the contact gap between the scraping block 35 and the dust removal filter bag 16 under the impact of the airflow, the cleaning effect is improved, and the impurities are prevented from being mixed in the contact gap to affect the cleaning effect; and the hot airflow contacts the outer surface of the dust removal filter bag 16 along with the contact and impact of the scraping block 35 on the outer surface of the dust removal filter bag 16, can penetrate more deeply into the inside of the dust removal filter bag 16, improve the heating and dehumidifying effect on the dust removal filter bag 16, reduce the agglomeration of the adhered impurities, and ensure the normal work of the dust removal filter bag 16.

[0069] Example five:

[0070] On the basis of example four, the impact pipe 151 is vertically arranged in the fixed framework 15, the impact pipe 151 is annularly distributed around the central axis of the dust removal filter bag 16 and in contact with the inner surface of the dust removal filter bag 16, and plays a limiting role on the dust removal filter bag 16.

[0071] The top of the impact pipe 151 is communicated with the inside of the cleaning cavity 3, and the impact hole 152 is arranged on the side wall of the impact pipe 151 and opposite to the inner surface of the dust removal filter bag 16, and the impact hole 152 is inclined downward. The blowing pipe 2 is communicated with the inside of the cleaning cavity 3 through the connecting pipe 22, so as to realize the cooperation of the blowing pipe 2 and the cleaning cavity 3 in the hot airflow cleaning operation.

[0072] Specific workflow: on the basis of the specific workflow in embodiment one, the impact pipe 151 is used as a vertical support part in the fixed framework 15, vertically extending, supporting and limiting the dust removal filter bag 16 inside the dust removal filter bag 16, so that the dust removal filter bag 16 will not deform and twist greatly under the impact of external airflow, ensuring that it can normally carry out purification treatment; the blowing pipe 2 is communicated with the cleaning cavity 3 inside, so that after the blowing pipe 2 starts to release the blowing airflow, it cooperates with the entering hot airflow to increase the air pressure inside the cleaning cavity 3, and then accelerates to flow out through the communicated flushing pipe 32 and impact pipe 151, realizing the synchronization of the outside drying and cleaning operation and the inside blowing and impact cleaning operation, and further realizing the double cleaning of the inside and outside of the dust removal filter bag 16.

[0073] Specifically, the flushing pipe 32 impacts the outer surface of the dust removal filter bag 16 from the outside of the dust removal filter bag 16, and part of the hot airflow penetrates into the dust removal filter bag 16 through the impact pipe 151, and then impacts the inner surface of the dust removal filter bag 16 from the impact hole 152 on the side wall of the impact pipe 151, so that the dust removal filter bag 16 is subjected to reverse impact from the inside and outside, and the impact from the inside and outside is inclined downward, so that the flushing action of the airflow can more effectively clean the dust and impurities adhered to the outer surface of the dust removal filter bag 16 and make it accelerate downward into the ash discharge pipe 33, improving the cleaning effect of the dust removal filter bag 16; and through the guidance of the impact pipe 151, the pulse blowing airflow of the blowing pipe 2 can more directly and comprehensively act on the inner surface of the dust removal filter bag 16, improving the utilization rate of the pulse blowing airflow.

[0074] Embodiment six

[0075] On the basis of the above embodiments, as shown in the drawings Figure 9 The production method includes the following steps:

[0076] S1: After being mined, the gypsum ore needs to be processed by the beneficiation module, which crushes the gypsum ore and separates the gypsum ore with a particle size meeting the processing requirements into the gypsum powder production line, and the gypsum ore with a particle size not meeting the requirements needs to be crushed and screened again;

[0077] S2: The calcination equipment of the calcination module in the gypsum powder production line will perform calcination treatment on the beneficiated gypsum ore, with a calcination temperature of 140-180℃ and a duration of 5-6 hours, and the water content in the gypsum ore will be adjusted during the calcination process to meet the requirements, and finally the gypsum semi-finished product is obtained;

[0078] S3: The gypsum semi-finished product will be crushed into powder by the gypsum powder special mill in the crushing module, then the gypsum powder with the required particle size will be separated through the screen, cooperate with the vibrating screen in the sorting module, remove the large particle gypsum, and continue to adjust the moisture in the gypsum powder under the action of the drying equipment, so that it meets the requirements of the finished product, then it is packaged and shipped out;

[0079] S4: In the above production process, the calcining equipment and drying equipment in the gypsum powder production line are communicated with the dust removal assembly of the purification module, the waste gas generated is purified by the dust removal assembly to remove the dust impurities therein, then it passes through the water bath desulfurization tower in the desulfurization assembly to remove the sulfur-containing pollutants therein, so that the waste gas generated meets the emission standard, realizing dust-free production.

[0080] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A dust-free production equipment for building gypsum powder, including a gypsum powder production line, which includes a beneficiation module, a calcination module, a crushing module, a sorting module and a purification module; The purification module includes a dust removal component and a desulfurization component. The dust removal component is used to remove dust from the flue gas generated during the production process and then sends it to the desulfurization component for desulfurization and purification. Its characteristics are: The dust removal assembly includes a bag dust removal device and a wet ash water pool. The bag dust removal device includes a body, and a purification chamber and an air outlet chamber are provided inside the body. The purification chamber and the air outlet chamber are separated by a partition. An air inlet pipe is provided on the side wall of the purification chamber, and an air outlet pipe is provided on the side wall of the air outlet chamber. The air outlet pipe is connected to the desulfurization assembly. Venturi tubes are evenly arranged on the partitions to connect the purification chamber and the air outlet chamber. A fixed frame is provided on the lower side of the venturi tube, and a dust filter bag is fixed on the outside of the fixed frame. A blow pipe is provided on the upper side of the partition inside the purification chamber. The blow pipe is connected to the pulse air supply component to realize pulse blow cleaning of the dust filter bag. An ash outlet is provided at the bottom of the purification chamber, an ash discharge device is provided inside the ash outlet, and the wet ash water pool is connected to the ash outlet; a cleaning chamber is provided inside the partition, and the cleaning chamber is connected to the external hot air source; a flushing hole is provided at the bottom of the cleaning chamber facing the outer surface of the dust filter bag, and the flushing hole releases dry hot air to flush the outer surface of the dust filter bag to clean the outer surface of the dust filter bag; A flushing pipe is provided inside the flushing hole. The flushing pipe is arranged vertically and releases downward hot air flow. The bottom of the flushing pipe extends downward to a position close to the bottom of the dust filter bag. Cleaning holes are evenly arranged on the side wall of the flushing pipe pointing to the outer surface of the dust filter bag. A dust discharge pipe is provided on the lower side of the flushing pipe. The dust discharge pipe is vertically arranged, and the bottom of the dust discharge pipe extends to the lower side of the air inlet pipe opening and is close to the dust outlet at the bottom; the top opening of the dust discharge pipe is conical and faces the lower side of the dust filter bag; Cleaning rings are evenly arranged on the outside of the dust filter bag, and the cleaning rings are connected to the outer surface of the flushing pipe; an annular groove is arranged on the inner wall of the cleaning ring, and the annular groove is arranged in an annular shape around the middle axis of the dust filter bag in the middle, and the annular groove is connected to the corresponding cleaning hole.

2. A dust-free production equipment for building gypsum powder according to claim 1, characterized in that: A scraper is provided on the inner surface of the cleaning ring facing the surface of the dust filter bag; the tapered end of the scraper contacts the outer surface of the dust filter bag; The flushing pipe is slidably connected to the inner wall of the flushing hole, and the top of the flushing pipe is connected to the inner wall of the top of the flushing hole by a spring; the bottom of the ash discharge pipe is slidably embedded in the limit ring, and the limit ring is connected to the inner wall of the cleaning chamber to limit the movement trajectory of the ash discharge pipe.

3. A dust-free production equipment for building gypsum powder according to claim 2, characterized in that: The scrapers are evenly distributed on the upper and lower sides of the annular groove.

4. A dust-free production equipment for building gypsum powder according to claim 3, characterized in that: A guide groove is provided on the scraper block, one end of the guide groove is communicated with the annular groove, and the other end extends to the end of the scraper block.

5. The dust-free production equipment for building gypsum powder according to claim 4, characterized in that: The flushing pipe is elastically arranged, and a vibrator is arranged inside the flushing pipe, and the vibrator is controlled by an external controller.

6. The dust-free production equipment for building gypsum powder according to claim 1, characterized in that: An impact tube is vertically arranged in the fixed frame. The impact tube is distributed in a ring around the central axis of the dust filter bag and contacts the inner surface of the dust filter bag, playing a supporting and limiting role for the dust filter bag. The top of the impact tube is communicated with the interior of the cleaning chamber, and an impact hole is provided on the side wall of the impact tube at a position facing the inner surface of the dust filter bag, and the impact hole is inclined downward.

7. A dust-free production equipment for building gypsum powder according to claim 6, characterized in that: The blowing pipe is communicated with the interior of the cleaning chamber through a connecting pipe.

8. A dust-free production method for building gypsum powder, the production method using the production equipment described in any one of claims 1 to 7, characterized in that: The production method comprises the following steps: S1: After gypsum ore is mined, it needs to be processed by the beneficiation module. The beneficiation module crushes the gypsum ore and separates the gypsum ore with the particle size that meets the processing requirements and enters the gypsum powder production line. The gypsum ore that does not meet the particle size requirements needs to be crushed and screened again; S2: The calcining equipment in the calcining module of the gypsum powder production line calcines the gypsum ore after beneficiation at a temperature of 140°C-180°C for 5-6 hours. During the calcination process, the moisture content in the gypsum ore is adjusted to meet the requirements, and the semi-finished gypsum product is finally obtained. S3: The semi-finished gypsum product is processed into powder by the gypsum powder grinding machine in the crushing module. The gypsum powder that meets the particle size requirements is then separated through a screen. The vibrating screen in the sorting module removes large gypsum particles. The moisture content of the gypsum powder is further adjusted by the drying equipment to meet the requirements of the finished product. It is then packaged and shipped. S4: In the above production process, the calcining equipment and drying equipment in the gypsum powder production line are connected to the dust removal component of the purification module. The generated exhaust gas is purified by the dust removal component to remove dust impurities, and then passes through the water bath desulfurization tower in the desulfurization component to remove sulfur-containing pollutants, so that the generated exhaust gas meets the emission standards and realizes dust-free production.

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