Rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device

Abstract

The utility model discloses a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device which comprises a premixer, and the feeding end of the premixer is respectively connected with a feeding device and a material returning device; the feeding end of the rotary indirect heat exchanger is connected with the discharging end of the premixer, a transition area is arranged on the inner side of the feeding end, and a material returning device and a discharging device are arranged at the discharging end; a furnace end sealing device is arranged at the furnace end of the rotary indirect heat exchanger; and a furnace tail sealing device is arranged at the furnace tail of the rotary drum. According to the rotary dry ammonium furnace, heat exchange is achieved, and meanwhile scabs of the rotary dry ammonium furnace are effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field, and particularly relates to a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device. Background Art

[0002] Ammonium chloride is mainly produced from soda ash production. Every ton of soda ash produces about 1 ton of ammonium chloride as a byproduct. At present, my country's annual production of soda ash ammonium chloride is about 15 million tons. In order to facilitate transportation, storage and use, wet ammonium chloride needs to be dried.

[0003] At present, fluidized bed heat exchange technology is mostly used in the production of ammonium chloride, which uses hot air to directly contact wet materials for mass transfer and heat transfer. However, this method has high energy consumption and large ammonia tail gas emissions (according to the "2612 Inorganic Alkali Manufacturing Industry Coefficient Manual", the emission of ammonia waste gas containing dry ammonium accounts for about 90% of the organized emissions of joint alkali production). These problems have seriously affected the low-carbon development of the joint alkali industry. According to statistics, the average steam consumption per ton of technical products is about 220kg / t, electricity is 25kwh / t (tail gas circulation), tail gas volume is 2000NM3 / t, and ammonia emissions are 2-4kg / t. In addition, the fluidized bed drying equipment has the disadvantages of short operation cycle, large system air volume, difficulty in tail gas collection and treatment, high power consumption and large heat energy loss. At the same time, the fluidized bed is also difficult to scale up due to the limitations of the process structure principle.

[0004] In addition, when the current rotary ammonium drying furnace is used for ammonium chloride heat exchange, due to the particularity of ammonium chloride materials, it is very easy to cause problems such as material adhesion in the furnace. Therefore, the rotary ammonium drying furnace has not been able to be industrially applied in the production of ammonium chloride. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art methods, the purpose of the utility model is to propose a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device, which effectively reduces the scarring of the rotary ammonium drying furnace while achieving heat exchange.

[0006] To achieve the above purpose, the utility model adopts a technical solution: a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device, comprising:

[0007] A premixer, wherein the feed end of the premixer is respectively connected to a feed device and a return device;

[0008] and a rotary indirect heat exchanger, wherein the feed end is connected to the discharge end of the premixer, a transition zone is arranged inside the feed end, and a return device and a discharge device are arranged at the discharge end; a furnace head sealing device is arranged at the furnace head of the rotary indirect heat exchanger, and a furnace tail sealing device is arranged at the furnace tail of the rotating drum.

[0009] Furthermore, the furnace head sealing device comprises:

[0010] A pneumatic seal, which is arranged between the joint surface of the rotary indirect heat exchanger furnace body and the air intake hood; an opening is arranged in the middle of the pneumatic seal, which is communicated with the air intake pipe arranged in the air intake hood;

[0011] The spiral seal is arranged between the joint surface of the furnace body and the air inlet hood; the spiral seal adopts a material pushing spiral, which is spirally wound around the outer wall of the air inlet hood and connected to the furnace body. When the furnace body and the air inlet hood rotate relative to each other, the material pushing spiral pushes the material toward the furnace body;

[0012] and a mechanical seal, which is arranged on the air intake hood and connects the furnace body and the outer wall of the air intake hood; the mechanical seal includes a dynamic sealing ring and a static sealing ring, the dynamic sealing ring is connected to the furnace body, the static sealing ring is connected to the static sealing ring bracket, the static sealing ring bracket is fixed on the outer wall of the air intake hood, and a sealing filler is arranged under the static sealing ring bracket; a clamping device is movably arranged on the static sealing ring bracket, one end of the clamping device is fixedly connected to the sealing bracket, and the sealing bracket is arranged on the outer wall of the air intake hood.

[0013] Furthermore, the furnace tail sealing device comprises a sealing dynamic ring, a dynamic ring sealing ring, a sealing static ring and a sealing ring;

[0014] The sealing dynamic ring is connected to the furnace body as a whole, and the sealing dynamic ring rotates with the furnace body;

[0015] The sealing static ring is connected to the discharge cover;

[0016] The dynamic ring sealing ring is arranged between the sealing dynamic ring and the sealing static ring;

[0017] The sealing ring and the sealing static ring are connected to the discharge cover; the sealing static ring is fixed by a pressing piece.

[0018] The mutual cooperation between the furnace tail sealing device and the furnace head sealing device can maintain the interior of the furnace body in a slightly negative pressure state, thereby preventing the outflow of internal harmful gases and reducing the scarring of materials inside the furnace head.

[0019] Furthermore, the premixer is provided with a raw material inlet, a return material inlet and an exhaust gas outlet, the raw material inlet is connected to a feeding device, the return material inlet is connected to a return material device, and the exhaust gas outlet is connected to an exhaust gas treatment device;

[0020] A mixed material outlet is arranged at the lower part of the lowest end of the premixer, and the mixed material outlet leads to the feed end of the rotary indirect heat exchanger to facilitate the transfer of materials.

[0021] Furthermore, the premixer is tilted, and from the high end to the low end, the return material inlet, the raw material inlet, and the ammonia outlet are arranged in sequence above the upper shell of the premixer, and the lower part of the lowest end is the mixed material outlet, which is convenient for the transfer of materials.

[0022] Furthermore, a feed screw is arranged after the premixer, and the discharge end of the feed screw leads to the rotary indirect heat exchanger, so as to realize smooth transmission of materials from the premixer to the rotary indirect heat exchanger.

[0023] Furthermore, the premixer adopts a heat exchange premixer, including: a shell, a jacket, a hollow shaft and hollow blades; the shell is provided with a jacket, and the jacket is provided with a steam condensate inlet and a steam condensate outlet; the hollow shaft extends and passes through the shell, and the hollow blades are provided on the hollow shaft, and the steam condensate inlet and the steam condensate outlet are provided on the hollow shaft.

[0024] Furthermore, the premixer adopts a heat exchange premixer, including: a shell, a jacket, a solid shaft and solid stirring blades; the shell is provided with a jacket, and the jacket is provided with a steam condensate inlet and a steam condensate outlet; the solid shaft extends and passes through the shell, and the solid stirring blades are provided on the solid shaft.

[0025] Furthermore, the rotary indirect heat exchanger comprises: a rotating drum and a heat exchange tube;

[0026] The rotating drum has a material channel inside;

[0027] At least one group of heat exchange tubes are concentrically arranged in the rotating drum to improve the heat exchange effect.

[0028] Furthermore, the transition zone includes a spacer sleeve arranged inside the furnace body, a transition cavity is formed between the spacer sleeve and the furnace body, and a transition heat exchange tube, a copy plate and a chain are arranged in the transition cavity to reduce the scarring of the material inside the furnace body.

[0029] Furthermore, the rotary indirect heat exchanger is arranged at an angle, with the high end being the furnace head, which is the feed end, and the low end being the furnace tail, which is the discharge end, to facilitate material transfer.

[0030] Furthermore, the ends of the heat exchange tubes of the rotary indirect heat exchanger are closed and face upward, and are inclined along the drum.

[0031] Furthermore, a material baffle is arranged in the furnace at the furnace tail of the rotating drum, and the center of the material baffle is opened to serve as the material outlet, so that the material stays in the furnace to obtain sufficient heat exchange.

[0032] Furthermore, it also includes a moisture-carrying and ammonia-carrying heat exchanger, and the moisture-carrying and ammonia-carrying heat exchanger is connected to the rotary indirect heat exchanger.

[0033] Furthermore, the moisture-carrying ammonia heat exchanger comprises a blower and a heat exchanger, the blower is connected to the heat exchanger, and the heat exchanger is connected to the rotary indirect heat exchanger.

[0034] Furthermore, the return material device includes a return material discharger, a return material conveyor and a return material hopper. The return material discharger is arranged at the discharge end of the rotary indirect heat exchanger, the return material discharger is connected to the return material conveyor, the return material conveyor is connected to the return material hopper, and the return material hopper is connected to the premixer.

[0035] Furthermore, the material return device includes a bucket elevator and a scraper conveyor. The bucket elevator is arranged at the discharge end of the rotary indirect heat exchanger, the bucket elevator leads to the scraper conveyor arranged at the premixer, and the scraper conveyor leads to the premixer.

[0036] Furthermore, the buried scraper includes an inlet, two material outlets and an exhaust port; the buried scraper inlet leads to the bucket elevator, the buried scraper exhaust port is located above the buried scraper discharge port, the buried scraper first material outlet leads to the premixer, and the buried scraper second material outlet leads to the outside.

[0037] Furthermore, the material return device comprises an obliquely buried scraper conveyor, the input end of the obliquely buried scraper conveyor is arranged at the discharge end of the rotary indirect heat exchanger, and the obliquely buried scraper conveyor leads to the premixer.

[0038] Furthermore, the inclined scraper conveyor includes an inlet, two material outlets and an exhaust port; the inlet of the inclined scraper is connected to the discharge end of the rotary indirect heat exchanger, the exhaust port of the inclined scraper is located above the discharge port of the scraper conveyor, the first material outlet of the inclined scraper leads to the premixer, and the second material outlet of the inclined scraper leads to the outside.

[0039] Furthermore, an adjustable return valve is provided on the first material outlet, and the adjustable return valve is connected to the premixer to achieve return adjustment.

[0040] Furthermore, it also includes an exhaust gas treatment device, which is respectively arranged at the exhaust gas output end of the premixer and the exhaust gas output end of the rotary indirect heat exchanger to achieve zero emission.

[0041] Furthermore, the tail gas treatment device of the premixer is a combined alkali and ammonia absorber.

[0042] Furthermore, the exhaust gas treatment device of the rotary indirect heat exchanger includes: a cyclone separator, a bag dust collector, a furnace gas condensation tower, a furnace gas washing tower, a carbonization compressor and a carbonization tower; the exhaust gas end of the rotary indirect heat exchanger is connected to the cyclone separator, the bag dust collector, the furnace gas condensation tower, the furnace gas washing tower, the carbonization compressor and the carbonization tower in sequence.

[0043] Furthermore, the exhaust gas treatment device includes: a cyclone separator, a bag dust collector, a furnace gas condensation tower, a furnace gas washing tower, a carbonization cleaning gas compressor and a carbonization cleaning tower, the exhaust gas end of the rotary indirect heat exchanger is connected to the cyclone separator; the cyclone separator is connected to the bag dust collector, and the bag dust collector is also connected to the exhaust gas output end of the premixing heat exchanger; the output end of the bag dust collector is connected to the furnace gas condensation tower, the furnace gas washing tower, the carbonization cleaning gas compressor and the carbonization cleaning tower in sequence.

[0044] The beneficial effects of adopting this technical solution are:

[0045] The utility model has a special arrangement of a furnace head sealing device and a furnace tail sealing device in the rotary indirect heat exchanger. The two sealing devices cooperate with each other, so that the air pressure in the entire rotary indirect heat exchanger is stably maintained in a low negative pressure environment, reducing scarring.

[0046] Since the heat exchange tube is highly stable and ammonium chloride is highly sensitive, direct contact will cause scarring. Therefore, on the basis of setting a sealing device, the present invention sets a transition zone on the inner side of the feed end of the rotary indirect heat exchanger to evaporate part of the water vapor and disperse it. The front section of the rotary heat exchanger of the present invention is provided with a transition zone structure, which can perform a second indirect heat exchange on the material on the basis of the first indirect heat exchange in the premixer, evaporate the remaining water and decompose the ammonia salt, and effectively reduce scarring in the furnace.

[0047] On the basis of the sealing device and the transition zone, the present invention also adopts a heated premixing heat exchanger to reduce the comprehensive moisture content of the material mixture entering the rotary indirect heat exchanger. By mixing the finished material and the raw material, the moisture content is combined with the setting of other overall devices to effectively reduce scarring in the furnace.

[0048] The utility model adopts two-stage indirect heat exchange. In the first stage of heat exchange, the cylinder of the premixer does not move, and the material is driven forward and heat is exchanged through stirring; in the second stage of heat exchange, the cylinder of the rotary indirect heat exchanger rotates, indirectly exchanges heat with the material, and pushes the material forward, reducing the amount of moisture and ammonia carried, and fundamentally reducing energy consumption.

[0049] Since most of the free ammonia entrained in the evaporating wet material raw materials is used, the utility model recycles the tail gas to achieve zero emission, while reducing the ammonia content of the tail gas of the rotary indirect heat exchanger and reducing the impact of the tail gas overflow on the surrounding environment in abnormal situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device of the utility model;

[0051] Figure 2This is a schematic diagram of the structure of a production device for energy-saving and emission-reducing ammonium chloride products using a rotary indirect heat exchange method using Implementation Scheme 1 in the embodiment of the utility model;

[0052] Figure 3 This is a schematic diagram of the structure of a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride production device using Implementation Scheme 2 in the material return device in the embodiment of the utility model;

[0053] Figure 4 This is a schematic diagram of the structure of a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride production device using Implementation Scheme 3 in the material return device in the embodiment of the utility model;

[0054] Figure 5 This is a schematic diagram of the structure of the furnace head sealing device in the embodiment of the utility model;

[0055] Figure 6 This is a schematic diagram of the structure of the furnace tail sealing device in the embodiment of the utility model;

[0056] Figure 7 This is a structural schematic diagram of the first implementation scheme of the premixer in the embodiment of the utility model;

[0057] Figure 8 It is a top schematic diagram of the first implementation scheme of the premixer in the embodiment of the utility model;

[0058] Fig. 9 This is a structural schematic diagram of the second implementation scheme of the premixer in the embodiment of the utility model;

[0059] Fig.10 It is a top schematic diagram of the second implementation scheme of the premixer in the embodiment of the utility model;

[0060] Fig.11 This is a structural schematic diagram of the second implementation scheme of the tail gas treatment device in the embodiment of the utility model;

[0061] Among them, 1 premixer, 2 rotary indirect heat exchanger, 3 feeding device, 4 return device, 5 discharge device, 6 furnace head sealing device, 7 furnace tail sealing device, 8 moisture and ammonia heat exchanger, 9 alkali ammonia absorber, 10 cyclone separator, 11 bag filter, 12 furnace gas condensing tower, 13 furnace gas washing tower, 14 carbonization compressor, 15 carbonization tower, 16 carbonization cleaning gas compressor, 17 carbonization cleaning tower, 18 air intake hood, 19 air intake pipe, 20 furnace body, 21 discharge hood; 1-1 raw material inlet, 1-2 return material inlet, 1-3 tail gas outlet, 1-4 mixed material outlet, 1-5 feeding screw; 1-6 shell, 1-7 jacket, 1-8 hollow shaft, 1-9 hollow blade, 1-10 Solid shaft, 1-11 solid stirring blade; 2-1 rotating drum, 2-2 heat exchange tube, 2-3 spacer, 2-4 transition chamber, 2-5 transition heat exchange tube, 2-6 copying plate, 2-7 baffle plate, 2-8 chain; 4-1 return material discharger, 4-2 return material conveyor, 4-3 return material bucket elevator; 4-4 bucket elevator, 4-5 buried scraper, 4-6 oblique buried scraper conveyor; 6-1 pneumatic seal, 6-2 spiral seal, 6-3 dynamic sealing ring, 6-4 static sealing ring, 6-5 static sealing ring bracket, 6-6 sealing packing, 6-7 clamping device, 6-8 sealing bracket, 6-9 flexible joint; 7-1 sealing dynamic ring, 7-2 dynamic ring sealing ring, 7-3 sealing static ring, 7-4 sealing ring. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described below with reference to the accompanying drawings.

[0063] In this embodiment, see Figure 1-Figure 4 As shown, a rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device comprises:

[0064] A premixer 1, wherein the feed end of the premixer 1 is respectively connected to a feed device 3 and a return device 4;

[0065] and a rotary indirect heat exchanger 2, the feed end of which is connected to the discharge end of the premixer 1, a transition zone is arranged on the inner side of the feed end, and a return device 4 and a discharge device 5 are arranged on the discharge end; a furnace head sealing device 6 is arranged at the furnace head of the rotary indirect heat exchanger 2, and a furnace tail sealing device 7 is arranged at the furnace tail of the rotating drum 2-1.

[0066] As an optimization solution of the above embodiment, Figure 5 As shown, the furnace head sealing device 6 comprises:

[0067] A pneumatic seal 6-1, which is disposed between the joint surface of the furnace body 20 of the rotary indirect heat exchanger 2 and the air inlet cover 18; an opening is provided in the middle of the pneumatic seal 6-1, which communicates with the air inlet pipe 19 disposed in the air inlet cover 18;

[0068] The spiral seal 6-2 is arranged between the joint surface of the furnace body 20 and the air inlet hood 18; the spiral seal 6-2 adopts a material pushing spiral, which is spirally wound around the outer wall of the air inlet hood 18 and connected to the furnace body 20. When the furnace body 20 and the air inlet hood 18 rotate relative to each other, the material pushing spiral pushes the material toward the furnace body 20;

[0069] and a mechanical seal, which is arranged on the air intake hood 18 and connects the furnace body 20 with the outer wall of the air intake hood 18; the mechanical seal includes a dynamic seal ring 6-3 and a static seal ring 6-4, the dynamic seal ring 6-3 is connected to the furnace body 20, the static seal ring 6-4 is connected to the static seal ring bracket 6-5, the static seal ring bracket 6-5 is fixed on the outer wall of the air intake hood 18, and a sealing filler 6-6 is arranged under the static seal ring bracket 6-5; a clamping device 6-7 is movably arranged on the static seal ring bracket 6-5, one end of the clamping device 6-7 is fixedly connected to the sealing bracket 6-8, and the sealing bracket 6-8 is arranged on the outer wall of the air intake hood 18.

[0070] The furnace tail sealing device 7, such as Figure 6 As shown, it includes a sealing dynamic ring 7-1, a dynamic ring sealing ring 7-2, a sealing static ring 7-3 and a sealing ring 7-4;

[0071] The sealing dynamic ring 7-1 is connected to the furnace body 20 as a whole, and the sealing dynamic ring 7-1 rotates together with the furnace body 20;

[0072] The sealing static ring 7-3 is connected to the discharge cover 21;

[0073] The dynamic ring sealing ring 7-2 is arranged between the sealing dynamic ring 7-1 and the sealing static ring 7-3;

[0074] The sealing ring 7-4 and the sealing static ring 7-3 are connected to the discharge cover 21 and remain stationary during the operation of the equipment; the sealing static ring 7-3 is fixed by a clamping member.

[0075] Due to the special arrangement of the furnace head sealing device 6 and the furnace tail sealing device 7 of the rotary indirect heat exchanger 2, the two sealing devices cooperate with each other, so that the air pressure in the entire rotary indirect heat exchanger 2 is stably maintained in a low negative pressure environment. However, the existing technology is unable to stably maintain the low negative pressure, and unstable air pressure will cause scarring.

[0076] As an optimization solution of the above embodiment, Figure 2-4 and Figure 8 and Fig.10 As shown, the premixer 1 is provided with a raw material inlet 1-1, a return material inlet 1-2 and an exhaust gas outlet 1-3, the raw material inlet 1-1 is connected to a feed device 3, the return material inlet 1-2 is connected to a return material device 4, and the exhaust gas outlet 1-3 is connected to an exhaust gas treatment device;

[0077] A mixed material outlet 1-4 is provided at the lower part of the lowest end of the premixer 1, and the mixed material outlet 1-4 leads to the feed end of the rotary indirect heat exchanger 2. The return material inlet 1-2 of the premixer 1 is arranged at the high end, receiving the material from the return material device 4; the raw material inlet 1-1 is located 200mm to 1500mm below the return material inlet 1-2, receiving the ammonium chloride containing 5% to 10% water from the centrifuge; the mixed material outlet 1-4 is located at the lower part of the low end.

[0078] Preferably, the premixer 1 is tilted, from high end to low end, above the upper shell 1-6 of the premixer 1 are the return material inlet 1-2, the raw material inlet 1-1, the ammonia outlet, and the lower part of the lowest end is the mixed material outlet 1-4.

[0079] Preferably, a feed screw 1-5 is arranged behind the premixer 1, and the discharge end of the feed screw 1-5 leads to the rotary indirect heat exchanger 2. The premixer 1 has a rotating shaft inside, and a stirring device is arranged on the shaft. Driven by the rotation of the stirring device, the material moves from the high end to the low end, and the processed qualified mixed material is conveyed to the mixed material outlet 1-4 at the lower part of the lower end. The mixed material uses its own weight to pass through the chute and enter the feed screw 1-5. The premixer 1 can be a single-shaft or double-shaft premixer 1. The raw material conveying belt in the premixer 1 is an existing technology for the production of alkali.

[0080] The specific structure of the premixer 1 can adopt the first embodiment: Figure 7 and Figure 8 As shown, the heat exchange premixer 1 includes: a shell 1-6, a jacket 1-7, a hollow shaft 1-8 and a hollow blade 1-9; the shell 1-6 is provided with a jacket 1-7, the jacket 1-7 is provided with a steam condensate inlet and a steam condensate outlet, the steam condensate is introduced into the steam condensate inlet of the jacket 1-7, and then discharged from the steam condensate outlet of the jacket 1-7; the hollow shaft 1-8 extends and penetrates into the shell 1-6, the hollow blade 1-9 is provided on the hollow shaft 1-8, the steam condensate inlet and the steam condensate outlet are provided on the hollow shaft 1-8; the steam condensate is introduced into the steam condensate inlet of the hollow shaft 1-8, and then discharged from the steam condensate outlet of the hollow shaft 1-8; the steam condensate drives the hollow stirring blades to exchange heat with the material through the hollow shaft 1-8. The steam condensate refers to the condensate generated after heat exchange with the moisture-carrying and ammonia-carrying heat exchanger 8 and / or the rotary indirect heat exchanger 2. The heat exchange area is large, the heat exchange intensity is high, and the amount of ammonia evaporated from the mixed material is large, which is beneficial to the operation of the downstream rotary indirect heat exchanger 2.

[0081] The specific structure of the premixer 1 can adopt the second embodiment: Fig. 9 and Fig.10As shown, the heat exchange premixer 1 includes: a shell 1-6, a jacket 1-7, a solid shaft 1-10 and a solid stirring blade 1-11; the shell 1-6 is provided with a jacket 1-7, the jacket 1-7 is provided with a steam condensate inlet and a steam condensate outlet, the steam condensate inlet of the jacket 1-7 is introduced into the steam condensate, and then discharged from the steam condensate outlet of the jacket 1-7; the solid shaft 1-10 extends and penetrates into the shell 1-6, and the solid stirring blade 1-11 is provided on the solid shaft 1-10. The equipment has low manufacturing cost and low difficulty.

[0082] As an optimization solution of the above embodiment, Figure 1 As shown, the rotary indirect heat exchanger 2 comprises: a rotating drum 2-1 and a heat exchange tube 2-2;

[0083] The rotating drum 2-1 has a material channel inside;

[0084] At least one group of heat exchange tubes 2-2 are concentrically arranged in the rotating drum 2-1. The heat exchange tubes 2-2 serve as steam channels, using steam as a heat source to indirectly exchange heat with the material.

[0085] Preferably, a transition zone is provided inside the feed end of the rotating drum 2-1; the transition zone includes a spacer sleeve 2-3 provided inside the furnace body 20, a transition chamber 2-4 is formed between the spacer sleeve 2-3 and the furnace body 20, and a transition heat exchange tube 2-5, a copy plate 2-6 and a chain 2-8 are provided in the transition chamber 2-4.

[0086] The spacer 2-3 structure is adopted and the heating tube in the furnace body 20 is used to complete the heat supply, so as to appropriately raise the temperature of the low-temperature material in the furnace head, and at the same time increase the overall temperature of the transition zone to avoid condensation of the dried water, and use the lifting plate 2-6 to break up the material to reduce material adhesion.

[0087] Preferably, the rotary indirect heat exchanger 2 is arranged tilted, with the high end being the furnace head, which is the feed end, and the low end being the furnace tail, which is the discharge end, so as to improve the material conveying effect.

[0088] The ends of the heat exchange tubes 2-2 of the rotary indirect heat exchanger 2 are closed and face upward, and are inclined along the drum. The steam moves upward, and the condensed water after heat exchange moves downward under the action of gravity, that is, the heat medium is in a return type in the tube.

[0089] Preferably, a material baffle plate 2-7 is arranged in the furnace at the furnace tail, and the center of the material baffle plate 2-7 is opened to serve as the material outlet, so as to maintain a suitable material layer at the bottom of the furnace.

[0090] As an optimization solution of the above embodiment, Figure 2-4As shown, it also includes a wet ammonia heat exchanger 8, which is connected to the rotary indirect heat exchanger 2. The wet ammonia heat exchanger 8 receives raw carbon dioxide gas or polluted nitrogen gas, nitrogen, and air from synthetic ammonia, and sends them into the rotary indirect heat exchanger 2 after heat exchange.

[0091] Specifically, the moisture-carrying and ammonia-carrying heat exchanger 8 includes a blower and a heat exchanger, the blower is connected to the heat exchanger, and the heat exchanger is connected to the rotary indirect heat exchanger 2. The raw materials received from the synthetic ammonia are sequentially sent to the rotary indirect heat exchanger 2 through the blower and the heat exchanger. The blower can also be eliminated, and the above purpose can be achieved by using the external conveying pressure or the negative pressure of the induced draft fan of the tail gas system of the rotary indirect heat exchanger 2. The moisture-carrying and ammonia-carrying heat exchanger 8 is a prior art, and the heat medium of the moisture-carrying and ammonia-carrying heat exchanger 8 can be the condensed water generated after the heat exchange of the rotary indirect heat exchanger 2, or the low-pressure steam of 0.1-0.5MPaG.

[0092] For the specific structure of the return device 4, the first embodiment can be adopted: Figure 2 As shown, the return device 4 includes a return discharger 4-1, a return conveyor 4-2 and a return hopper 4-3, wherein the return discharger 4-1 is arranged at the discharge end of the rotary indirect heat exchanger 2, the return discharger 4-1 is connected to the return conveyor 4-2, the return conveyor 4-2 is connected to the return hopper, and the return hopper is connected to the premixer 1. The return discharger 4-1 transfers the return material to the return conveyor 4-2, and then the return hopper 4-3 transfers the return material fed by the return conveyor 4-2 to the premixer 1.

[0093] For the specific structure of the return device 4, the second implementation scheme can be adopted: Figure 3 As shown, the return device 4 includes a bucket elevator 4-4 and a scraper 4-5, the bucket elevator 4-4 is arranged at the discharge end of the rotary indirect heat exchanger 2, the bucket elevator 4-4 leads to the scraper 4-5 arranged at the premixer 1, and the scraper 4-5 leads to the premixer 1. The bucket elevator 4-4 lifts the return material to the scraper 4-5 arranged at the premixer 1, and the scraper 4-5 transfers the return material to the premixer 1.

[0094] The buried scraper includes an inlet, two material outlets and an air extraction port; the buried scraper inlet leads to the bucket elevator 4-4, the buried scraper air extraction port is located above the buried scraper 4-5 discharge port, the buried scraper first material outlet leads to the premixer 1, and the buried scraper second material outlet leads to the outside. The inlet receives the material from the bucket elevator 4-4, the air extraction port is located above the buried scraper 4-5 discharge port, and sends the furnace gas brought out of the furnace and the dust generated during the transportation process to the bag dust collector; the first material outlet leads to the premixer 1, and the second material outlet leads to the material packaging equipment.

[0095] Preferably, an adjustable return valve is provided on the first material outlet, and the first material outlet is connected to the premixer 1 via the adjustable return valve.

[0096] Compared with Implementation Plan I, Implementation Plan II cancels the return screw machine, combines the finished product bucket elevator and the return bucket elevator 4-3 into a bucket elevator 4-4, reduces the conveying equipment, and saves space.

[0097] For the specific structure of the return device 4, the third embodiment can be adopted: Figure 4 As shown, the return device 4 includes an obliquely buried scraper conveyor 4-6, the input end of the obliquely buried scraper conveyor 4-6 is arranged at the discharge end of the rotary indirect heat exchanger 2, and the obliquely buried scraper conveyor 4-6 leads to the premixer 1 to transfer the returned material to the premixer 1.

[0098] The obliquely buried scraper conveyor 4-6 includes an inlet, two material outlets and an exhaust port; the inlet of the obliquely buried scraper is connected to the discharge end of the rotary indirect heat exchanger 2, the exhaust port of the obliquely buried scraper is located above the discharge port of the buried scraper 4-5, the first material outlet of the obliquely buried scraper leads to the premixer 1, and the second material outlet of the obliquely buried scraper leads to the outside. The inlet receives the material from the discharge end of the rotary indirect heat exchanger 2, the exhaust port is located above the discharge port of the buried scraper 4-5, and the furnace gas brought out of the furnace and the dust generated during the transportation process are sent to the bag dust collector; the first material outlet leads to the premixer 1; the second material outlet device is at the material conveying end of the buried scraper 4-5, as the finished product outlet, to ensure that the remaining material after the return material is output from this port, and after crushing, screening and cooling, it is sent to the finished product warehouse.

[0099] Compared with Implementation Plan II, Implementation Plan III cancels the discharging screw machine and replaces the bucket elevator 4-4 and the buried scraper machine 4-5 with an inclined buried scraper machine 4-5, further reducing the conveying equipment and saving space.

[0100] Preferably, an adjustable return valve is provided on the first material outlet, and the first material outlet is connected to the premixer 1 via the adjustable return valve.

[0101] As an optimization solution of the above embodiment, it also includes an exhaust gas treatment device, which is respectively arranged at the exhaust gas output end of the premixer 1 and the exhaust gas output end of the rotary indirect heat exchanger 2.

[0102] The tail gas treatment device of the premixer 1 is a combined alkali and ammonia absorber 9 .

[0103] The tail gas of the premixer 1 has a high ammonia concentration and is preferably sent to the combined alkali ammonia absorber 9 through a pipeline. Based on an annual output of 500,000 tons, the ammonia absorption can recover 90 kg / h of ammonia, accounting for 40% to 50% of the total recoverable ammonia. It can also be sent to the tail gas treatment system of the rotary indirect heat exchanger 2 through a pipeline.

[0104] The specific structure of the tail gas treatment device of the rotary indirect heat exchanger 2 can adopt the implementation scheme 1: Figure 2-Figure 4 As shown, the tail gas treatment device of the rotary indirect heat exchanger 2 includes: a cyclone separator 10, a bag dust collector 11, a furnace gas condensation tower 12, a furnace gas washing tower 13, a carbonization compressor 14 and a carbonization tower 15; the tail gas end of the rotary indirect heat exchanger 2 is connected to the cyclone separator 10, the bag dust collector 11, the furnace gas condensation tower 12, the furnace gas washing tower 13, the carbonization compressor 14 and the carbonization tower 15 in sequence.

[0105] The exhaust gas from the exhaust hood of the rotary indirect heat exchanger 2 passes through the cyclone separator 10 and the bag filter 11 for gas-solid separation. After the solid particles are separated, the exhaust gas is sent to the furnace gas condensation tower 12 and the furnace gas washing tower 13 for purification, and then enters the carbonization compressor 14 and is sent to the carbonization tower 15 to react with the mother liquor to generate sodium bicarbonate and ammonium chloride.

[0106] The specific structure of the tail gas treatment device of the rotary indirect heat exchanger 2 can adopt the second embodiment: Fig.11 As shown, the exhaust gas treatment device includes: a cyclone separator 10, a bag dust collector 11, a furnace gas condensing tower 12, a furnace gas washing tower 13, a carbonization cleaning gas compressor 16 and a carbonization cleaning tower 17, the exhaust gas end of the rotary indirect heat exchanger 2 is connected to the cyclone separator 10; the cyclone separator 10 is connected to the bag dust collector 11, and the bag dust collector 11 is also connected to the exhaust gas output end of the premixing heat exchanger; the output end of the bag dust collector 11 is connected to the furnace gas condensing tower 12, the furnace gas washing tower 13, the carbonization cleaning gas compressor 16 and the carbonization cleaning tower 17 in sequence.

[0107] The tail gas from the rotary indirect heat exchanger passes through the downstream cyclone separator 10; the gas exiting the cyclone separator 10 enters the bag filter 11 together with the premixed heat exchanger gas ammonia output from the premixed heat exchanger; the tail gas exiting the bag filter 11 passes through the downstream furnace gas condensation tower 12 and furnace gas washing tower 13 respectively; the wet and ammonia-carrying gas after the upstream purification treatment passes through the tail gas fan and enters the carbonization cleaning gas compressor 16, and is sent to the carbonization cleaning tower 17 from the bottom after pressurization, and works together with the cleaning liquid added to the upper part of the carbonization cleaning tower 17 to dissolve the scar blocks generated in the carbonization tower 15.

[0108] The above shows and describes the basic principle, main features and 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 of the utility model is defined by the attached claims and their equivalents.

Claims

1. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device, characterized in that: include: A premixer (1), wherein a feed end of the premixer (1) is connected to a feed device (3) and a return device (4); and a rotary indirect heat exchanger (2), wherein the feed end is connected to the discharge end of the premixer (1), a transition zone is provided inside the feed end, and a return device (4) and a discharge device (5) are provided at the discharge end; a furnace head sealing device (6) is provided at the furnace head of the rotary indirect heat exchanger (2), and a furnace tail sealing device (7) is provided at the furnace tail of the rotary indirect heat exchanger (2).

2. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The furnace head sealing device (6) comprises: A pneumatic seal (6-1), the pneumatic seal (6-1) being arranged between a joint surface of a furnace body (20) of a rotary indirect heat exchanger (2) and an air intake hood (18); an opening is arranged in the middle of the pneumatic seal (6-1) and communicates with an air intake pipe (19) arranged in the air intake hood (18); A spiral seal (6-2) is arranged between the joint surface of the furnace body (20) and the air intake hood (18); the spiral seal (6-2) adopts a material pushing spiral, which is spirally wound around the outer wall of the air intake hood (18) and connected to the furnace body (20); when the furnace body (20) and the air intake hood (18) rotate relative to each other, the material pushing spiral pushes the material toward the furnace body (20); and a mechanical seal, which is arranged on the air intake hood (18) and connects the furnace body (20) and the outer wall of the air intake hood (18); the mechanical seal comprises a dynamic seal ring (6-3) and a static seal ring (6-4); the dynamic seal ring (6-3) is connected to the furnace body (20); the static seal ring (6-4) is connected to a static seal ring bracket (6-5); the static seal ring bracket (6-5) is fixed to the outer wall of the air intake hood (18); a sealing filler (6-6) is arranged under the static seal ring bracket (6-5); a clamping device (6-7) is movably arranged on the static seal ring bracket (6-5); one end of the clamping device (6-7) is fixedly connected to a sealing bracket (6-8); and the sealing bracket (6-8) is arranged on the outer wall of the air intake hood (18).

3. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The furnace tail sealing device (7) comprises a sealing dynamic ring (7-1), a dynamic ring sealing ring (7-2), a sealing static ring (7-3) and a sealing ring (7-4); The sealing movable ring (7-1) is connected to the furnace body (20) as a whole, and the sealing movable ring (7-1) rotates together with the furnace body (20); The sealing static ring (7-3) is connected to the discharge cover (21); The dynamic ring sealing ring (7-2) is arranged between the sealing dynamic ring (7-1) and the sealing static ring (7-3); The sealing ring (7-4) and the sealing static ring (7-3) are connected to the discharge cover (21); the sealing static ring (7-3) is fixed by a clamping member.

4. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The premixer (1) is provided with a raw material inlet (1-1), a return material inlet (1-2) and an exhaust gas outlet (1-3), the raw material inlet (1-1) is connected to a feed device (3), the return material inlet (1-2) is connected to a return material device (4), and the exhaust gas outlet (1-3) is connected to an exhaust gas treatment device; A mixed material outlet (1-4) is provided at the lower part of the lowest end of the premixer (1), and the mixed material outlet (1-4) leads to the feed end of the rotary indirect heat exchanger (2).

5. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 4, characterized in that: The premixer (1) is arranged obliquely, and from the high end to the low end, above the upper shell (1-6) of the premixer (1) there are a return material inlet (1-2), a raw material inlet (1-1), and an ammonia outlet in sequence, and the lower part of the lowest end is a mixed material outlet (1-4).

6. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to any one of claims 1 to 5, characterized in that: A feed screw (1-5) is arranged after the premixer (1), and the discharge end of the feed screw (1-5) leads to the rotary indirect heat exchanger (2).

7. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 6, characterized in that: The premixer (1) is a heat exchange premixer (1), comprising: a shell (1-6), a jacket (1-7), a hollow shaft (1-8) and hollow blades (1-9); the shell (1-6) is provided with a jacket (1-7), and the jacket (1-7) is provided with a steam condensate inlet and a steam condensate outlet; the hollow shaft (1-8) extends and penetrates into the shell (1-6), the hollow blades (1-9) are provided on the hollow shaft (1-8), and the steam condensate inlet and the steam condensate outlet are provided on the hollow shaft (1-8).

8. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 6, characterized in that: The premixer (1) is a heat exchange premixer (1), comprising: a shell (1-6), a jacket (1-7), a solid shaft (1-10) and a solid stirring blade (1-11); the shell (1-6) is provided with a jacket (1-7), and the jacket (1-7) is provided with a steam condensate inlet and a steam condensate outlet; the solid shaft (1-10) extends and penetrates into the shell (1-6), and the solid stirring blade (1-11) is provided on the solid shaft (1-10).

9. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The rotary indirect heat exchanger (2) comprises: a rotating drum (2-1) and a heat exchange tube (2-2); The rotating drum (2-1) has a material channel inside; At least one group of heat exchange tubes (2-2) are concentrically arranged in the rotating drum (2-1).

10. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 9, characterized in that: The transition zone comprises a spacer (2-3) arranged inside the furnace body (20), a transition chamber (2-4) is formed between the spacer (2-3) and the furnace body (20), and a transition heat exchange tube (2-5), a copy plate (2-6) and a chain (2-8) are arranged in the transition chamber (2-4).

11. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 9, characterized in that: The rotary indirect heat exchanger (2) is arranged tilted, with the high end being the furnace head, which is the feed end, and the low end being the furnace tail, which is the discharge end.

12. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 9, characterized in that: The ends of the heat exchange tubes (2-2) of the rotary indirect heat exchanger (2) are closed and face upward, tilted along the drum.

13. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 9, characterized in that: A material baffle plate (2-7) is arranged in the furnace at the furnace tail of the rotating drum (2-1), and the center of the material baffle plate (2-7) is opened to serve as a material outlet.

14. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: It also comprises a moisture-carrying and ammonia-carrying heat exchanger (8), wherein the moisture-carrying and ammonia-carrying heat exchanger (8) is connected to the rotary indirect heat exchanger (2).

15. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 14, characterized in that: The moisture-carrying ammonia heat exchanger (8) comprises a blower and a heat exchanger, the blower is connected to the heat exchanger, and the heat exchanger is connected to the rotary indirect heat exchanger (2).

16. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The return material device (4) comprises a return material discharger (4-1), a return material conveyor (4-2) and a return material hopper (4-3); the return material discharger (4-1) is arranged at the discharge end of the rotary indirect heat exchanger (2); the return material discharger (4-1) is connected to the return material conveyor (4-2); the return material conveyor (4-2) is connected to the return material hopper; and the return material hopper is connected to the premixer (1).

17. The rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The material return device (4) comprises a bucket elevator (4-4) and an embedded scraper (4-5); the bucket elevator (4-4) is arranged at the discharge end of the rotary indirect heat exchanger (2); the bucket elevator (4-4) leads to the embedded scraper (4-5) arranged at the premixer (1); and the embedded scraper (4-5) leads to the premixer (1).

18. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 17, characterized in that: The buried scraper comprises an inlet, two material outlets and an air suction port; the buried scraper inlet leads to the bucket elevator (4-4), the buried scraper air suction port is located above the material outlet of the buried scraper elevator (4-5), the first material outlet of the buried scraper leads to the premixer (1), and the second material outlet of the buried scraper leads to the outside.

19. The rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: The material return device (4) comprises an obliquely buried scraper conveyor (4-6), the input end of the obliquely buried scraper conveyor (4-6) being arranged at the discharge end of the rotary indirect heat exchanger (2), and the obliquely buried scraper conveyor (4-6) leading to the premixer (1).

20. The rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 19, characterized in that: The obliquely buried scraper conveyor (4-6) comprises an inlet, two material outlets and an air extraction port; the inlet of the obliquely buried scraper is connected to the discharge end of the rotary indirect heat exchanger (2), the air extraction port of the obliquely buried scraper is located above the discharge port of the buried scraper conveyor (4-5), the first material outlet of the obliquely buried scraper leads to the premixer (1), and the second material outlet of the obliquely buried scraper leads to the outside.

21. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 18 or 20, characterized in that: An adjustable return valve is provided on the first material outlet, and the first material outlet is connected to the premixer (1) via the adjustable return valve.

22. The rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 1, characterized in that: It also includes tail gas treatment devices, which are respectively arranged at the tail gas output end of the premixer (1) and the tail gas output end of the rotary indirect heat exchanger (2).

23. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 22, characterized in that: The tail gas treatment device of the premixer (1) is a combined alkali and ammonia absorber (9).

24. A rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 22, characterized in that: The tail gas treatment device of the rotary indirect heat exchanger (2) comprises: a cyclone separator (10), a bag dust collector (11), a furnace gas condensing tower (12), a furnace gas washing tower (13), a carbonization compressor (14) and a carbonization tower (15); the tail gas end of the rotary indirect heat exchanger (2) is connected to the cyclone separator (10), the bag dust collector (11), the furnace gas condensing tower (12), the furnace gas washing tower (13), the carbonization compressor (14) and the carbonization tower (15) in sequence.

25. The rotary indirect heat exchange energy-saving and emission-reducing ammonium chloride product production device according to claim 22, characterized in that: The tail gas treatment device comprises: a cyclone separator (10), a bag dust collector (11), a furnace gas condensing tower (12), a furnace gas washing tower (13), a carbonization cleaning gas compressor (16) and a carbonization cleaning tower (17); the tail gas end of the rotary indirect heat exchanger (2) is connected to the cyclone separator (10); the cyclone separator (10) is connected to the bag dust collector (11), and the bag dust collector (11) is also connected to the tail gas output end of the premixing heat exchanger; the output end of the bag dust collector (11) is connected to the furnace gas condensing tower (12), the furnace gas washing tower (13), the carbonization cleaning gas compressor (16) and the carbonization cleaning tower (17) in sequence.

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