Anti-crystallization method for denitrification process using urea hydrolysis to produce ammonia, and adjusting apparatus

Abstract

The present invention relates to the technical field of flue heat exchanger installation, in particular to an anti-crystallization method for a denitrification process using urea hydrolysis to produce ammonia, and an adjusting apparatus, comprising a main body component, which comprises a heat exchanger main body and connecting seats, mounting bases arranged on an upper side of the heat exchanger main body and on a lower side of the connecting seats, a U-shaped lug arranged on a side wall of the mounting bases, a connecting lug arranged on a side wall of the U-shaped lug, a supporting base arranged on the connecting lug, a support arranged on a side wall of the supporting base, and a suspension rod mounted on a side wall of the connecting lug; the adjusting component comprises a moving assembly arranged on the support, an adjusting assembly arranged on the moving assembly, and a fixing assembly arranged on the moving assembly. This allows for the adjustment and fixing of the longitudinal distance between two corresponding suspension rods, guaranteeing installation levelness of the heat exchanger main body, and the suspension rods are uniformly stressed, thereby preventing fracturing of the suspension rods from localized stress, and ensuring the installation stability of the heat exchanger main body.

Description

A method and regulating device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process. Technical Field

[0001] This invention relates to the field of flue heat exchanger installation technology, and in particular to a method and regulating device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process. Background Technology

[0002] Currently, in the denitrification process of urea hydrolysis to ammonia production, in order to avoid the reverse reaction leading to a decrease in denitrification efficiency, a flue heat exchanger needs to be installed in the flue below the third catalyst layer of the denitrification process. The cold dilution air is heated and then sent into the ammonia-air mixer to contact the ammonia-containing airflow, in order to prevent the formation of carbamate ammonia crystals, ensure a stable ammonia supply flow, and improve denitrification efficiency. However, the flue heat exchanger is generally installed by means of a hanger. Since the length of the hanger is fixed and the installation position in the flue is limited, it is impossible to ensure the horizontality of the installation, resulting in uneven stress on the hanger. Local hangers are subjected to long-term stress, which can easily cause the hanger to break, leading to the flue heat exchanger falling and being damaged, affecting its use.

[0003] Summary of the Invention

[0004] In view of the problems in the existing technology mentioned above, such as the inability to guarantee the levelness of the installation, resulting in uneven stress on the hanger rod, easy breakage of the hanger rod, and damage to the flue heat exchanger due to falling, thus affecting its use, this invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a method and regulating device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: It includes: installing the denitrification device as a whole and connecting the pipelines; placing the urea solution in the hydrolysis reactor; heating and hydrolyzing the urea solution with steam to generate an ammonia-containing gas flow; installing a flue heat exchanger in the catalyst pipeline of the denitrification device; adjusting the installation height of the flue heat exchanger through an adjustment mechanism; distributing the ammonia-containing gas flow through the flow regulation module on the hydrolysis reactor and then entering the ammonia-air mixer in the denitrification device; the flue gas generated by the denitrification device entering the flue heat exchanger to heat the cold dilution air to 150°C; the heated cold dilution air entering the ammonia-air mixer of the denitrification device and mixing with the ammonia-containing gas flow; the ammonia-containing gas flow being diluted by the heated cold dilution air to ensure that ammonia with a concentration of less than 5% does not undergo a reverse reaction, thus avoiding the formation of ammonia carbamate crystals.

[0007] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the working temperature of the flue gas is between 300 and 370°C, which satisfies the requirement of heating the cold dilution air from 0°C to above 180°C under the minimum denitrification load condition, and the maximum temperature does not exceed 300°C.

[0008] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, wherein: the catalyst pipeline is a vertical pipeline under the third layer of catalyst in the denitrification device.

[0009] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, it includes: a main body component, comprising a heat exchanger body and a connecting seat, a fixed seat disposed on the upper side of the heat exchanger body and the lower side of the connecting seat, a U-shaped lug disposed on the side wall of the fixed seat, a connecting lug disposed on the side wall of the U-shaped lug, a support seat disposed on the connecting lug, a support disposed on the side wall of the support seat, and a hanging rod disposed on the side wall of the connecting lug; an regulating component, comprising a moving component disposed on the support, an regulating component disposed on the moving component, and a fixed component disposed on the moving component; and a connecting component, comprising a connecting component disposed on the hanging rod, a support component disposed on the connecting component, and a limiting component disposed on the connecting component.

[0010] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for urea hydrolysis to ammonia production process of the present invention, the movable component includes a first through groove disposed on the front side of the support, a first sliding groove formed on the inner side wall of the first through groove, a first sliding plate slidably connected in the first through groove, a second sliding plate fixedly connected to the side wall of the first sliding plate, two movable seats fixedly connected to the side wall of the first sliding plate, a V-shaped seat fixedly connected to the side wall of each of the two movable seats, and a pull seat fixedly connected to the upper side of the two movable seats; wherein, the second sliding plate is slidably connected to the first sliding groove.

[0011] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the regulating component includes a guide groove disposed on the side wall of the V-shaped seat, the guide groove having a first arc surface and a second arc surface, a first slide block slidably connected in the guide groove, a slide column fixedly connected to the side wall of the first slide block, an regulating groove opened in the support seat, a second through groove opened in the side wall of the support seat, a third through groove opened in the side wall of the support seat, and an regulating seat slidably connected in the regulating groove; wherein, the slide column is slidably connected to the third through groove, and the side wall of the regulating seat is fixedly connected to the suspension rod.

[0012] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the fixing component includes a first groove disposed on the upper wall of the first chute, a first spring fixedly connected to the inner side wall of the first groove, a fixing block fixedly connected to the lower side of the first spring, a first inclined surface provided on the right side of the fixing block, a connecting column fixedly connected to the upper side of the fixing block, a connecting block fixedly connected to the upper side of the connecting column, a fourth through groove opened on the upper side of the support, a fixing groove opened on the upper side of the second sliding plate, and a second inclined surface provided on the inner side wall of the fixing groove; wherein, the fixing block is inserted into the fixing groove, and the connecting column is slidably connected to the fourth through groove.

[0013] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the connecting assembly includes a second groove disposed on the side wall of the boom, a connecting groove is opened on the outer surface of the boom, a connecting plate is slidably connected in the connecting groove, a second sliding seat is fixedly connected to the side wall of the connecting plate, a fixing rod is provided on the left side of the support base, a second sliding groove is opened on the side wall of the fixing rod, a rotating plate is fixedly connected to the side wall of the connecting plate, and a rotating column is fixedly connected to the side wall of the rotating plate; wherein, the second sliding seat and the second sliding groove are slidably connected.

[0014] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the supporting assembly includes a rotating plate disposed on the outer surface of the rotating column; a rotating groove is formed in the regulating seat; a connecting groove is formed on the inner side wall of the rotating groove; a sliding groove is formed in the regulating seat; a first guide groove is formed on the upper side of the rotating plate; a second guide groove is provided in the first guide groove; a third arc surface is provided in the first guide groove; a pushing seat is slidably connected in the connecting groove; a third groove is formed on the side wall of the pushing seat; a guide column is fixedly connected to the inner side wall of the third groove; a fourth groove is formed on the side wall of the pushing seat; a supporting block is slidably connected in the sliding groove; a U-shaped block is fixedly connected to the side wall of the supporting block; rotating blocks are rotatably connected to both the U-shaped block and the inner side wall of the fourth groove; a pressing plate is fixedly connected to the outer surface of the rotating block; and a supporting groove is formed on the inner side wall of the regulating groove; wherein the supporting block is inserted into the supporting groove, and the connecting groove communicates with the sliding groove.

[0015] As a preferred embodiment of the denitrification and anti-crystallization method and regulating device for the urea hydrolysis ammonia production process of the present invention, the limiting component includes a third sliding groove disposed in the connecting plate, a second spring fixedly connected to the lower wall of the third sliding groove, a slider fixedly connected to the upper side of the second spring, a dial seat and a plug fixedly connected to the upper side of the slider, two fifth through grooves opened on the upper side of the connecting plate, and two slots opened on the upper wall of the through groove; wherein, the plug is inserted into the slot.

[0016] The beneficial effects of the denitrification and anti-crystallization method and adjustment device in the urea hydrolysis ammonia production process of this invention are as follows: By setting the adjustment component, the distance between the two longitudinally corresponding hangers can be adjusted and fixed, ensuring the horizontality of the heat exchanger body installation. By setting the connecting component, the adjustment seat can be provided with auxiliary support force and play a reinforcing role. This solves the problem that the horizontality of the installation cannot be guaranteed, resulting in uneven stress on the hangers, which can easily cause the hangers to break and lead to the flue heat exchanger falling and being damaged, affecting its use. It achieves the effect of uniform stress on the hangers, preventing local hanger breakage due to stress, avoiding the heat exchanger body falling and being damaged, and ensuring the stability of the heat exchanger body installation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0019] Figure 2 is a cross-sectional view of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0020] Figure 3 is an enlarged view of point A in Figure 2.

[0021] Figure 4 is a cross-sectional view of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0022] Figure 5 is a schematic diagram of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0023] Figure 6 is a schematic diagram of the second slide plate of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0024] Figure 7 is a schematic diagram of the fixed components of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0025] Figure 8 is a schematic diagram of the overall connection components of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0026] Figure 9 is a schematic diagram of the overall connection components of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0027] Figure 10 is a schematic diagram of the overall support components of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0028] Figure 11 is a cross-sectional view of the regulating seat of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0029] Figure 12 is a schematic diagram of the rotating plate of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0030] Figure 13 is a schematic diagram of the overall connection components of the denitrification and anti-crystallization method and regulating device in the urea hydrolysis ammonia production process.

[0031] Figure 14 is an enlarged view of point B in Figure 13.

[0032] In the diagram: 100, main component; 101, heat exchanger body; 102, connecting seat; 103, fixed seat; 104, U-shaped lug; 105, connecting lug; 106, support seat; 107, support; 108, suspension rod; 200, adjusting component; 201, moving assembly; 201a, first through groove; 201b, first slide groove; 201c, first sliding plate; 201d, second sliding plate; 201e, moving seat; 201f, V-shaped seat; 201g, pull seat; 202, adjusting assembly; 20 2a. Guide groove; 202b. First arc surface; 202c. Second arc surface; 202d. First slide block; 202e. Sliding column; 202f. Adjustment groove; 202g. Second through groove; 202h. Third through groove; 202i. Adjustment seat; 203. Fixing assembly; 203a. First groove; 203b. First spring; 203c. Fixing block; 203d. First inclined surface; 203e. Connecting column; 203f. Connecting block; 203g. Fourth through groove; 203h. Fixing groove; 203i. Second inclined surface; 300, connecting component; 301, connecting assembly; 301a, second groove; 301b, connecting groove; 301c, connecting plate; 301d, second slide block; 301e, fixing rod; 301f, second sliding groove; 301g, rotating plate; 301h, rotating column; 302, support assembly; 302a, rotating plate; 302b, rotating groove; 302c, connecting groove; 302d, sliding groove; 302e, first guide groove; 302f, second guide groove; 302g, Third arc surface; 302h, Push seat; 302i, Third groove; 302j, Guide post; 302k, Fourth groove; 302l, Support block; 302m, U-shaped block; 302n, Rotating block; 302o, Extrusion plate; 302p, Support groove; 303, Limiting component; 303a, Third slide groove; 303b, Second spring; 303c, Slider; 303d, Dial seat; 303e, Insert post; 303f, Fifth through groove; 303g, Slot. Detailed Implementation

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0036] Example 1

[0037] This is the first embodiment of the present invention, which provides a method and regulating device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process. The method includes: installing a denitrification device as a whole and connecting the pipelines; placing a urea solution in a hydrolysis reactor; heating and hydrolyzing the urea solution with steam to generate an ammonia-containing gas flow; installing a flue gas heat exchanger inside the catalyst pipeline of the denitrification device; adjusting the installation height of the flue gas heat exchanger via a regulating mechanism M; distributing the ammonia-containing gas flow through a flow regulating module on the hydrolysis reactor and then entering an ammonia-air mixer in the denitrification device; the flue gas generated by the denitrification device entering the flue gas heat exchanger to heat the cold dilution air to 150°C; the heated cold dilution air entering the ammonia-air mixer of the denitrification device and mixing with the ammonia-containing gas flow; the ammonia-containing gas flow being diluted by the heated cold dilution air to ensure that ammonia with a concentration less than 5% does not undergo a reverse reaction, thus avoiding the formation of ammonia carbamate crystals; the operating temperature of the flue gas being between 300 and 370°C, meeting the requirement of heating the cold dilution air from 0°C to 180°C under the minimum denitrification load conditions. The above, and the maximum temperature does not exceed 300℃; the catalyst pipeline is a vertical pipeline under the third layer of catalyst in the denitrification unit.

[0038] Specifically, preventing the formation of ammonia carbamate crystals can avoid clogging of the ammonia injection branch pipe, thus avoiding interruption or insufficient ammonia supply flow and improving denitrification efficiency. The ammonia-containing gas flow is diluted by hot dilution air in the ammonia-air mixer, and the resulting ammonia gas enters the ammonia-flue gas mixing system and is injected into the denitrification device by the injection system to complete the denitrification process.

[0039] Example 2

[0040] Referring to Figures 1-8, this is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method and adjustment device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process. This ensures the horizontality of the heat exchanger body 101, ensures uniform force distribution on multiple hangers 108, prevents breakage of localized hangers 108 due to excessive force, and avoids damage to the heat exchanger body 101 from falling and affecting its performance. It includes a main component 100, comprising a heat exchanger body 101 and a connecting seat 102, a fixing seat 103 disposed on the upper side of the heat exchanger body 101 and the lower side of the connecting seat 102, and U-shaped lugs 104 disposed on the sidewall of the fixing seat 103. The lug 104 has a connecting lug 105 on its side wall, a support 106 on the connecting lug 105, a support 107 on the side wall of the support 106, and a hanger 108 on the side wall of the connecting lug 105; an adjusting component 200 includes a moving component 201 on the support 107, an adjusting component 202 on the moving component 201, and a fixing component 203 on the moving component 201; and a connecting component 300 includes a connecting component 301 on the hanger 108, a support component 302 on the connecting component 301, and a limiting component 303 on the connecting component 301.

[0041] Specifically, multiple connecting seats 102 and fixed seats 103 are provided, and the multiple connecting seats 102 and fixed seats 103 are arranged in a rectangular array. The corresponding connecting seat 102 is fixedly connected to the corresponding fixed seat 103, the corresponding fixed seat 103 is fixedly connected to the heat exchanger body 101, the fixed seat 103 is fixedly connected to the U-shaped lug 104, the U-shaped lug 104 is movably connected to the connecting lug 105, the support seat 106 is fixedly connected to the support 107, and multiple hangers 108 are provided, and the multiple hangers 108 are arranged in a rectangular array. The multiple hangers 108 located on the upper side are fixedly connected to the lower side of the corresponding connecting lug 105, while the multiple hangers 108 located on the lower side are fixedly connected to the upper side of the corresponding connecting lug 105. The two hangers 108 in the longitudinal direction are symmetrically arranged.

[0042] Furthermore, the movable component 201 includes a first through groove 201a disposed on the front side of the support 107, a first sliding groove 201b formed on the inner sidewall of the first through groove 201a, a first sliding plate 201c slidably connected within the first through groove 201a, a second sliding plate 201d fixedly connected to the sidewall of the first sliding plate 201c, two movable seats 201e fixedly connected to the sidewall of the first sliding plate 201c, V-shaped seats 201f fixedly connected to the sidewalls of both movable seats 201e, and a pull seat 201g fixedly connected to the upper side of both movable seats 201e; wherein, the second sliding plate 201d is slidably connected to the first sliding groove 201b; the adjustment component 202 includes A guide groove 202a is provided on the side wall of the V-shaped seat 201f. The guide groove 202a has a first arc surface 202b and a second arc surface 202c. A first slide block 202d is slidably connected in the guide groove 202a. A slide column 202e is fixedly connected to the side wall of the first slide block 202d. An adjustment groove 202f is opened in the support seat 106. A second through groove 202g and a third through groove 202h are opened in the side wall of the support seat 106. An adjustment seat 202i is slidably connected in the adjustment groove 202f. The slide column 202e is slidably connected to the third through groove 202h, and the side wall of the adjustment seat 202i is fixedly connected to the hanger rod 108.

[0043] Specifically, the two movable seats 201e are symmetrically arranged. When the first slide 202d is located at the second arc surface 202c, the distance between the two longitudinal hangers 108 is the closest. The movable seat 201e is provided with two guide grooves 202a, which are symmetrically arranged and inclined. This allows the two longitudinal hangers 108 to move away from each other under the action of the first slide 202d and the guide grooves 202a as the first slide 202d gradually moves from the second arc surface 202c to the first arc surface 202b. The two transverse sliding columns 202e are fixedly connected to the middle and rear middle of the corresponding adjusting seats 202i, respectively. There are two adjusting grooves 202f, which are symmetrically arranged. The second through groove 202g communicates with the adjusting grooves 202f. The two longitudinal hangers 108 are slidably connected to the support seat 106 through the corresponding second through groove 202g.

[0044] Furthermore, the fixing component 203 includes a first groove 203a disposed on the upper wall of the first slide groove 201b, a first spring 203b fixedly connected to the inner side wall of the first groove 203a, a fixing block 203c fixedly connected to the lower side of the first spring 203b, a first inclined surface 203d provided on the right side of the fixing block 203c, a connecting post 203e fixedly connected to the upper side of the fixing block 203c, a connecting block 203f fixedly connected to the upper side of the connecting post 203e, a fourth through groove 203g opened on the upper side of the support 107, a fixing groove 203h opened on the upper side of the second slide plate 201d, and a second inclined surface 203i provided on the inner side wall of the fixing groove 203h; wherein, the fixing block 203c is inserted into the fixing groove 203h, and the connecting post 203e is slidably connected to the fourth through groove 203g.

[0045] Specifically, there are two first springs 203b, which are symmetrically arranged. The connecting post 203e is located between the two first springs 203b. The fixing block 203c is slidably connected to the first groove 203a. The first inclined surface 203d is adapted to the second inclined surface 203i, so that when the second slide plate 201d moves to the right, the fixing block 203c can move upward under the action of the first inclined surface 203d and the second inclined surface 203i, thereby releasing the limiting fixation of the second slide plate 201d. When the fixing block 203c loses its squeezing force, the first spring 203b can cause the fixing block 203c to quickly insert downward into the corresponding fixing groove 203h under the action of the reaction force of the first spring 203b, thereby limiting and fixing the second slide plate 201d. There are multiple fixing grooves 203h, which are equidistantly distributed.

[0046] During use, the levelness of the heat exchanger body 101 is first checked using a level or a spirit level. Based on the levelness test results, the corresponding pull seat 201g is moved to the right, causing the moving seat 201e to drive the first sliding plate 201c and the second sliding plate 201d to slide to the right under the action of the first through groove 201a and the first sliding groove 201b. This causes the V-shaped seat 201f to slide to the right. The two longitudinal adjusting seats 202i move away from each other under the action of the first sliding seat 202d, the guide groove 202a, and the adjusting groove 202f, thereby adjusting the distance between the two longitudinal hangers 108 and the distance between the two longitudinal fixed seats 103. This ensures the levelness of the heat exchanger body 101 and ensures that each hanger 108 connected to the heat exchanger body 101 is evenly stressed, preventing localized stress on the hangers 108 and breakage, and preventing the heat exchanger body 101 from falling and being damaged, thus affecting the performance. At the same time, the second sliding plate 201d slides to the right within the first sliding groove 201b. When the fixed block 203c drives the connecting column 203e to move upward under the action of the first inclined surface 203d, the second inclined surface 203i, the first groove 203a and the fourth through groove 203g, it contacts the upper side of the first slide plate 201c. The first spring 203b is compressed and deformed to generate a reaction force. When the fixed block 203c moves upward into the first groove 203a, the fixed block 203c disengages from the fixed groove 203h, releasing the limit on the second slide plate 201d. The first slide plate 201c continues to slide to the right. When the corresponding fixed groove 203h is below the fixed block 203c, the fixed block 203c loses the compressive force and moves downward quickly under the action of the first spring 203b, so that the fixed block 203c inserts into the fixed groove 203h, thereby limiting and fixing the second slide plate 201d, and then limiting and fixing the adjusted hanger 108, so that the two hangers 108 can be stabilized after moving away from each other to a certain distance, ensuring the stability of the heat exchanger body 101 installation.

[0047] In summary, by cooperating with the moving component 201 and the adjusting component 202, the distance between the two longitudinally corresponding hangers 108 can be adjusted to ensure the horizontality of the heat exchanger body 101 installation, so that the multiple hangers 108 are subjected to uniform force, preventing local hangers 108 from breaking due to excessive force, and avoiding the heat exchanger body 101 from falling and being damaged, thus affecting the performance. Furthermore, by using the fixing component 203, the second slide plate 201d is limited and fixed, ensuring the stability of the heat exchanger body 101 installation.

[0048] Example 3

[0049] Referring to Figures 3 to 14, this is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method and adjustment device for denitrification and anti-crystallization in a urea hydrolysis ammonia production process. It includes a connecting assembly 301 with a second groove 301a disposed on the side wall of the lifting rod 108. A connecting groove 301b is opened on the outer surface of the lifting rod 108. A connecting plate 301c is slidably connected in the connecting groove 301b. A second sliding seat 301d is fixedly connected to the side wall of the connecting plate 301c. A fixing rod 301e is provided on the left side of the support base 106. A second sliding groove 301f is opened on the side wall of the fixing rod 301e. A rotating plate 301g is fixedly connected to the side wall of the connecting plate 301c. A rotating column 301h is fixedly connected to the side wall of the rotating plate 301g. The second sliding seat 301d is slidably connected to the second sliding groove 301f.

[0050] Specifically, the connecting groove 301b is connected to the second groove 301a. The connecting groove 301b is arc-shaped, so that when the rear side of the connecting plate 301c contacts the rear wall of the connecting groove 301b, the guide post 302j is located in the second guide groove 302f. When the front side of the connecting plate 301c contacts the front wall of the connecting groove 301b, the guide post 302j contacts the third arc surface 302g in the first guide groove 302e, which limits the sliding range of the connecting plate 301c. There are two second sliding grooves 301f, and the two second sliding grooves 301f are symmetrically arranged. The rotating plate 301g is slidably connected to the second groove 301a, and the rotating post 301h is located in the second groove 301a.

[0051] Furthermore, the support assembly 302 includes a rotating plate 302a disposed on the outer surface of the rotating column 301h, a rotating groove 302b formed in the adjusting seat 202i, a connecting groove 302c formed in the inner side wall of the rotating groove 302b, a sliding groove 302d formed in the adjusting seat 202i, a first guide groove 302e formed on the upper side of the rotating plate 302a, a second guide groove 302f formed in the first guide groove 302e, a third arc surface 302g formed in the first guide groove 302e, a pushing seat 302h slidably connected in the connecting groove 302c, a third groove 302i formed in the side wall of the pushing seat 302h, a guide column 302j fixedly connected in the inner side wall of the third groove 302i, a fourth groove 302k formed in the side wall of the pushing seat 302h, a support block 302l slidably connected in the sliding groove 302d, and a U-shaped block 302m fixedly connected in the side wall of the support block 302l. The inner walls of the U-shaped block 302m and the fourth groove 302k are rotatably connected to a rotating block 302n. The outer surface of the rotating block 302n is fixedly connected to a pressing plate 302o. The inner wall of the adjusting groove 202f has a support groove 302p. The support block 302l is inserted into the support groove 302p, and the connecting groove 302c communicates with the sliding groove 302d. The limiting component 303 includes a third sliding groove 303a disposed in the connecting plate 301c. The lower wall of the third sliding groove 303a is fixedly connected to a second spring 303b. The upper side of the second spring 303b is fixedly connected to a slider 303c. The upper side of the slider 303c is fixedly connected to a dial seat 303d and a pin 303e. The upper side of the connecting plate 301c has two fifth through grooves 303f, and the upper wall of the connecting groove 301b has two slots 303g. The pin 303e is inserted into the slot 303g.

[0052] Specifically, the rotating column 301h extends through the adjusting seat 202i into the rotating groove 302b and is rotatably connected to the adjusting seat 202i. Four connecting grooves 302c and four sliding grooves 302d are provided, and these four grooves are arranged in a circular array. Four first guide grooves 302e are provided, and these four guide grooves are arranged in a circular array. The second guide groove 302f communicates with the first guide grooves 302e. The guide column 302j is slidably connected to the first guide grooves 302e and the second guide grooves 302f. Next, two support blocks 302l are slidably connected within the sliding groove 302d, and the two support blocks 302l are symmetrically arranged. The outer surfaces of the corresponding two rotating blocks 302n are fixedly connected to the extrusion plate 302o. This allows the pusher 302h to slide from the first guide groove 302e to the second guide groove 302f under the action of the guide post 302j, moving from the connecting groove 302c into the sliding groove 302d. This causes the two corresponding support blocks 302l to move away from each other under the action of the extrusion plate 302o and the sliding groove 302d. This causes the support block 302l to insert into the corresponding support groove 302p. When the guide post 302j slides from the second guide groove 302f and the first guide groove 302e to the third arc surface 302g, the other two corresponding support blocks 302l move closer together under the action of the extrusion plate 302o and the sliding groove 302d, causing the support block 302l to disengage from the support groove 302p. Here, the extrusion plate 302o plays an auxiliary extrusion and auxiliary pulling role to control the two corresponding support blocks 302l to move away from or closer to each other. Limiting component 303 It is only set on the connecting plate 301c and the connecting groove 301b located on the upper side. Multiple support grooves 302p are provided, and the multiple support grooves 302p are equally distributed. Three second springs 303b are provided, and the three second springs 303b are equally distributed. The slide plate is slidably connected to the third slide groove 303a. The dial seat 303d and the insert post 303e are both slidably connected to the corresponding fifth through groove 303f. The insert post 303e and the slot 303g can limit the connecting plate 301c to prevent the rotating plate 302a from rotating.

[0053] In use, in conjunction with Embodiment 1, before moving the pull seat 201g to the right, press the pull seat 303d downwards. This causes the pull seat 303d to drive the slider 303c to slide downwards under the action of the third sliding groove 303a and the fifth through groove 303f. The second spring 303b is compressed and deformed, generating a reaction force. The insertion post 303e moves downwards with the movement of the slider 303c, causing the insertion post 303e to disengage from the slot 303g. Then, move the pull seat 303d forward, causing the connecting rod to slide forward under the action of the connecting groove 301b. This causes the rotating plate 301g to reverse under the action of the rotating post 301h and the connecting rod. The clockwise rotation causes the rotating plate 302a to rotate counterclockwise. At this time, the guide post 302j slides from the second guide groove 302f and the first guide groove 302e to the third arc surface 302g. The pushing seat 302h moves towards the rotating post 301h under the action of the connecting groove 302c, as the guide post 302j moves. This causes the corresponding two support blocks 302l to move closer together under the action of the sliding groove 302d, the rotating block 302n, and the pressing plate 302o, as shown in Figure 13. This causes the support blocks 302l to disengage from the support groove 302p, preventing the support blocks 302l and the support groove 302p from obstructing the adjusting seat 20. 2i slides within the adjusting groove 202f. After the distance between the two longitudinal suspension rods 108 is adjusted, the lever 303d is moved backward, causing the connecting rod to move backward. The rotating plate 301g rotates clockwise under the action of the rotating column 301h and the connecting rod, causing the rotating plate 302a to rotate clockwise. At this time, the guide column 302j slides from the second guide groove 302f to the first guide groove 302e, causing the pusher 302h to move away from the rotating column 301h under the action of the connecting groove 302c. This causes the pressing plate 302o to press the support block 302l, causing the corresponding two support blocks 302l to slide in the sliding groove 302f. Under the action of 02d, rotating block 302n and pressing plate 302o, they move away from each other, so that support block 302l is inserted into the corresponding support groove 302p, which plays the role of providing auxiliary support force for adjusting seat 202i and can also play a reinforcing role, further improving the stability of heat exchanger body 101 installation. Then, release the dial seat 303d, and slider 303c moves upward under the action of second spring 303b. Insert post 303e moves upward with slider 303c and inserts into slot 303g to limit the connecting rod, thereby limiting the rotating plate 302a and further playing a reinforcing role.

[0054] In summary, through the cooperation of the connecting component 301, the supporting component 302, and the fixing component 203, after the distance between the two longitudinal hangers 108 is adjusted, the supporting block 302l can be inserted into the corresponding supporting groove 302p, which provides auxiliary support force to the adjusting seat 202i and also plays a reinforcing role, thereby further improving the stability of the heat exchanger body 101 installation.

[0055] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0056] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0057] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for denitrification and anti-crystallization in a urea hydrolysis ammonia production process, characterized in that: include, Install the denitrification unit as a whole and connect the pipelines; Place the urea solution in the hydrolysis reactor; Steam heats and hydrolyzes urea solution, producing an ammonia-containing gas stream. Install the flue heat exchanger inside the catalyst pipeline of the denitrification unit; The installation height of the flue heat exchanger can be adjusted using the adjustment mechanism (M); After being distributed by the flow regulation module on the hydrolysis reactor, the ammonia-containing gas flow enters the ammonia-air mixer in the denitrification unit. The flue gas generated by the denitrification unit enters the flue heat exchanger to heat the cold dilution air to 150°C. The heated, cold dilution air enters the ammonia-air mixer of the denitrification unit and mixes with the ammonia-containing airflow; The ammonia-containing gas stream is diluted by heated cold dilution air to ensure that the ammonia gas concentration is less than 5% and does not undergo a reverse reaction, thus avoiding the formation of ammonia carbamate crystals.

2. The denitrification and anti-crystallization method for urea hydrolysis to ammonia production process as described in claim 1, characterized in that: The operating temperature of the flue gas is between 300 and 370°C, which meets the requirement of heating the cold dilution air from 0°C to above 180°C under the minimum denitrification load condition, and the maximum temperature does not exceed 300°C.

3. The denitrification and anti-crystallization method for urea hydrolysis to ammonia production process as described in claim 2, characterized in that: The catalyst pipeline is a vertical pipeline located below the third layer of catalyst in the denitrification unit.

4. An adjusting device, comprising the adjusting mechanism (M) according to any one of claims 1 to 3, characterized in that: include, The main component (100) includes a heat exchanger body (101) and a connecting seat (102), a fixing seat (103) disposed on the upper side of the heat exchanger body (101) and the lower side of the connecting seat (102), a U-shaped lug (104) disposed on the side wall of the fixing seat (103), a connecting lug (105) disposed on the side wall of the U-shaped lug (104), a support seat (106) disposed on the connecting lug (105), a support (107) disposed on the side wall of the support seat (106), and a hanger (108) disposed on the side wall of the connecting lug (105). The adjusting component (200) includes a movable component (201) disposed on the support (107), an adjusting component (202) disposed on the movable component (201), and a fixing component (203) disposed on the movable component (201); The connecting component (300) includes a connecting assembly (301) disposed on the boom (108), and is provided with... A support component (302) is placed on the connecting component (301), and a limiting component (303) is provided on the connecting component (301).

5. The adjusting device as described in claim 4, characterized in that: The movable component (201) includes a first through groove (201a) disposed on the front side of the support (107), a first sliding groove (201b) is formed on the inner side wall of the first through groove (201a), a first sliding plate (201c) is slidably connected in the first through groove (201a), a second sliding plate (201d) is fixedly connected to the side wall of the first sliding plate (201c), two movable seats (201e) are fixedly connected to the side wall of the first sliding plate (201c), a V-shaped seat (201f) is fixedly connected to the side wall of each of the two movable seats (201e), and a pull seat (201g) is fixedly connected to the upper side of the two movable seats (201e). The second slide plate (201d) is slidably connected to the first slide groove (201b).

6. The adjusting device as described in claim 5, characterized in that: The adjustment assembly (202) includes a guide groove (202a) disposed on the side wall of the V-shaped seat (201f), the guide groove (202a) having a first arc surface (202b) and a second arc surface (202c), a first slide block (202d) slidably connected in the guide groove (202a), a slide column (202e) fixedly connected to the side wall of the first slide block (202d), an adjustment groove (202f) opened in the support seat (106), a second through groove (202g) opened in the side wall of the support seat (106), a third through groove (202h) opened in the side wall of the support seat (106), and an adjustment seat (202i) slidably connected in the adjustment groove (202f). The sliding column (202e) is slidably connected to the third through groove (202h), and the side wall of the adjusting seat (202i) is fixedly connected to the hanging rod (108).

7. The adjusting device as described in claim 6, characterized in that: The fixing component (203) includes a first groove (203a) disposed on the upper wall of the first slide (201b), a first spring (203b) fixedly connected to the inner side wall of the first groove (203a), a fixing block (203c) fixedly connected to the lower side of the first spring (203b), a first inclined surface (203d) provided on the right side of the fixing block (203c), a connecting column (203e) fixedly connected to the upper side of the fixing block (203c), a connecting block (203f) fixedly connected to the upper side of the connecting column (203e), a fourth through groove (203g) opened on the upper side of the support (107), a fixing groove (203h) opened on the upper side of the second slide plate (201d), and a second inclined surface (203i) provided on the inner side wall of the fixing groove (203h). The fixing block (203c) is plugged into the fixing groove (203h), and the connecting post (203e) is slidably connected to the fourth through groove (203g).

8. The adjusting device as described in claim 7, characterized in that: The connecting assembly (301) includes a second groove (301a) disposed on the side wall of the rod (108), a connecting groove (301b) is opened on the outer surface of the rod (108), a connecting plate (301c) is slidably connected in the connecting groove (301b), a second slide block (301d) is fixedly connected to the side wall of the connecting plate (301c), a fixing rod (301e) is provided on the left side of the support base (106), a second sliding groove (301f) is opened on the side wall of the fixing rod (301e), a rotating plate (301g) is fixedly connected to the side wall of the connecting plate (301c), and a rotating column (301h) is fixedly connected to the side wall of the rotating plate (301g). The second slide block (301d) is slidably connected to the second slide groove (301f).

9. The adjusting device as described in claim 8, characterized in that: The support assembly (302) includes a rotating plate (302a) disposed on the outer surface of the rotating column (301h), a rotating groove (302b) formed in the adjusting seat (202i), a connecting groove (302c) formed on the inner side wall of the rotating groove (302b), a sliding groove (302d) formed in the adjusting seat (202i), a first guide groove (302e) formed on the upper side of the rotating plate (302a), a second guide groove (302f) provided in the first guide groove (302e), a third arc surface (302g) provided in the first guide groove (302e), and a push seat (302h) slidably connected in the connecting groove (302c). (302h) has a third groove (302i) on its side wall. A guide post (302j) is fixedly connected to the inner side wall of the third groove (302i). The push seat (302h) has a fourth groove (302k) on its side wall. A support block (302l) is slidably connected in the sliding groove (302d). A U-shaped block (302m) is fixedly connected to the side wall of the support block (302l). A rotating block (302n) is rotatably connected to the inner side wall of both the U-shaped block (302m) and the fourth groove (302k). An extrusion plate (302o) is fixedly connected to the outer surface of the rotating block (302n). A support groove (302p) is opened in the inner side wall of the adjusting groove (202f). The support block (302l) is plugged into the support groove (302p), and the connecting groove (302c) is connected to the sliding groove (302d).

10. The adjusting device as described in claim 9, characterized in that: The limiting component (303) includes a third slide groove (303a) disposed in the connecting plate (301c). A second spring (303b) is fixedly connected to the lower wall of the third slide groove (303a). A slider (303c) is fixedly connected to the upper side of the second spring (303b). A dial seat (303d) and a pin (303e) are fixedly connected to the upper side of the slider (303c). Two fifth through grooves (303f) are opened on the upper side of the connecting plate (301c). Two slots (303g) are opened on the upper wall of the through groove (301b). The insert (303e) is plugged into the slot (303g).

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