Automatic control system and method for preparing ammonia through urea hydrolysis

Abstract

The invention provides an automatic control system and method for urea hydrolysis ammonia production, and relates to the technical field of hydrolysis ammonia production control, a urea dissolving module comprises a dissolving stirring tank and a water storage tank, and is used for dissolving urea particles into a urea solution with a certain concentration; the urea hydrolysis module comprises a hydrolysis ammonia generator and is used for hydrolyzing the urea solution to generate ammonia gas and carbon dioxide; the steam heating module is used for providing heat required by the urea hydrolysis reaction; the condensation temperature adjusting module is used for reducing the reaction temperature when the urea hydrolysis reaction temperature is too high; the intelligent control module is used for performing intelligent and precise control on the whole system; wherein the intelligent control module comprises a sensor module, a controller and an execution mechanism, and the sensor module is used for monitoring the running states of the urea dissolving module, the urea hydrolysis module and the steam heating module in real time; the controller controls the executing mechanism according to monitoring data of the sensor module, and intelligent and precise control of the system is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrolysis ammonia production control, and in particular to an automatic control system and method for urea hydrolysis ammonia production. Background Art

[0002] With increasingly stringent environmental protection requirements, the emission control of nitrogen oxides (NOx) in flue gas generated by coal-fired power plants has become particularly important. Urea hydrolysis to produce ammonia is a safe and stable ammonia source, and is widely used in flue gas selective catalytic reduction (SCR) denitrification systems. The urea hydrolysis system forms a urea solution by reacting urea particles with desalted water, and then hydrolyzes under heating conditions to produce ammonia and carbon dioxide, providing the required reducing agent for the SCR denitrification system.

[0003] However, the existing urea hydrolysis ammonia production system still has problems such as high energy consumption, low ammonia conversion rate, insufficient automation and control accuracy. Summary of the invention

[0004] The present invention provides an automated control system and method for producing ammonia by hydrolyzing urea, which are used to solve at least one of the technical problems raised by the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides an automatic control system and method for producing ammonia by urea hydrolysis. The automatic control system for producing ammonia by urea hydrolysis comprises: a urea hydrolysis ammonia production system, wherein the urea hydrolysis ammonia production system comprises: a urea dissolution module, comprising a dissolution stirring tank and a water storage tank, for dissolving urea granules into a urea solution of a certain concentration; a urea hydrolysis module, comprising a hydrolysis ammonia generator, for hydrolyzing the urea solution to produce ammonia and carbon dioxide; a steam heating module, for providing the required heat for the urea hydrolysis reaction; a condensation temperature control module, for lowering the reaction temperature when the urea hydrolysis reaction temperature is too high;

[0006] The intelligent control module is electrically connected to the urea dissolution module, the urea hydrolysis module, the steam heating module and the condensation temperature control module respectively.

[0007] Preferably, the intelligent control module comprises: a data acquisition unit, a data processing unit and a remote control unit;

[0008] A data acquisition unit, used for real-time monitoring of the operating data of the urea dissolution module, the urea hydrolysis module and the steam heating module;

[0009] A data processing unit is used to process and analyze the data collected by the data collection unit to obtain the operating status and fault information of the system;

[0010] The remote control unit is used to receive remote control instructions and remotely control the urea dissolution module, urea hydrolysis module, steam heating module and condensation temperature control module.

[0011] Preferably, the intelligent control module further includes:

[0012] Energy-saving optimization unit, used to analyze and optimize the energy consumption of the system according to the real-time monitoring data of the data acquisition unit, so as to reduce the operating cost of the system;

[0013] The energy-saving optimization unit includes: an energy consumption monitoring subunit and an energy consumption control subunit;

[0014] Energy consumption monitoring subunit, used to monitor the energy consumption data of the system in real time, including electrical energy and thermal energy;

[0015] The energy consumption control subunit dynamically adjusts the operating parameters of the system according to the data of the energy consumption monitoring subunit to minimize the energy consumption.

[0016] Preferably, the urea hydrolysis module comprises: a bottom plate, a hydrolysis ammonia maker; the hydrolysis ammonia maker, the right end outlet of the dissolution stirring tank is fixedly connected to the top of the hydrolysis ammonia maker through a liquid supply pipe, and a liquid supply water pump is fixedly installed on the liquid supply pipe;

[0017] The hydrolysis ammonia generator comprises: a reaction tank body, the top of the bottom plate is fixedly installed with the reaction tank body in the left-right direction, the top of the right side of the reaction tank body is fixedly connected to an air outlet pipe, the air outlet pipe is fixedly connected to an air storage box, a pair of reflux ports are fixedly provided at intervals in the upper and lower right side walls of the reaction tank body, a reflux pump is fixedly connected between the upper and lower reflux ports, and a horizontally reversed catalyst layer is fixedly connected to the center of the interior of the reaction tank body.

[0018] Preferably, the steam heating module comprises: a steam generator, the steam generator is fixedly mounted on the bottom plate, the right end of the steam generator has an outlet fixedly connected to a steam supply pipe 1 along the front-to-back direction, the steam supply pipe 1 is fixedly connected to a plurality of groups of heating pipe networks at equal intervals in front and back, the heating pipe networks are all located inside the reaction tank body along the left-right direction, a first solenoid valve is fixedly mounted on the pipe at the connection between each group of heating pipe networks and the steam supply pipe 1, the right end of each group of heating pipe networks penetrates downward through the bottom wall of the reaction tank body and is fixedly connected to a recovery pipe, and the recovery pipe is fixedly connected to a recovery port of the steam generator;

[0019] The condensation temperature control module includes: a cooling water tank, a cooling water tank is fixedly installed on the bottom plate on the right side of the hydrolysis ammonia producer, the top of the cooling water tank is fixedly connected to a water supply circulation pump, the outlet of the water supply circulation pump is connected to the water supply main pipes in the left and right directions through a water supply pipe 1, the water supply main pipes are fixedly connected to a plurality of groups of condensation pipe networks at equal intervals on the left and right, the condensation pipe networks are all located in the top of the reaction tank body, and a second solenoid valve is installed at the connection between each group of condensation pipe networks and the water supply main pipe.

[0020] Preferably, a group of feeding control mechanisms are fixedly provided on the top of the dissolving and stirring tank and the hydrolysis ammonia making device, and the feeding control mechanism on the top of the dissolving and stirring tank includes: a feeding pipe, a vertical feeding pipe is fixedly installed on the top of the dissolving and stirring tank, the top of the feeding pipe is fixedly connected to a conical bucket, a pretreatment box is fixedly installed on the top of the conical bucket, a pair of grinding rollers along the left and right directions are fixedly provided symmetrically in the front and back center of the pretreatment box, the grinding rollers are rotatably connected to the left and right side walls of the pretreatment box, the right end of each grinding roller is fixedly connected to the output shaft end of a grinding motor, the grinding motor is fixedly connected to the right outer wall of the pretreatment box, and the top of the left side wall of the pretreatment box is hingedly connected to the cover plate; two groups of weighing switch mechanisms are symmetrically provided at the connection between the bottom of the pretreatment box and the conical bucket.

[0021] Preferably, the weighing switch mechanism on the left side includes: a bearing plate, a vertical movable opening is opened on the left side wall of the pretreatment box, the bearing plate is rotatably connected in the movable opening, the left end of the bearing plate is fixedly connected to a strip frame along the left and right directions, the strip frame is slidably hinged to the top of a vertical rod, the bottom end of the vertical rod is rotatably hinged to a horizontal rod along the left and right directions, the horizontal rod slides up and down and passes through the conical bucket, the right end of the horizontal rod is fixedly connected to a vertical adjustment cone, and a rubber ring is provided on the top outer sleeve of the adjustment cone; a plurality of elastic parts are symmetrically distributed on the bearing plate, the top of the elastic parts is fixedly connected to a horizontal plate, and the bottom of the horizontal plate is fixedly connected to a plurality of weighing sensors; the bottom end of the adjustment cone is fixedly connected to a sliding drive mechanism, and the sliding drive mechanism is used to provide a driving force for the adjustment cone to slide up and down.

[0022] Preferably, a method for automatically controlling ammonia production by urea hydrolysis is applied to the automatic control system for ammonia production by urea hydrolysis described above, and is characterized in that it comprises the following steps:

[0023] Step S1: adding urea granules and deionized water into a urea dissolution module to prepare a urea solution of a certain concentration;

[0024] Step S2: sending the urea solution into the urea hydrolysis module to perform a hydrolysis reaction under the action of the steam heating module;

[0025] Step S3: Intelligently and precisely control the hydrolysis reaction process through the intelligent control module, and monitor the operating status and fault information of the system in real time;

[0026] Step S4: adjusting the operating parameters of the intelligent control module according to the real-time monitoring data to ensure the stability and efficiency of the hydrolysis reaction;

[0027] Step S5: The ammonia and carbon dioxide produced by the hydrolysis reaction are collected into a gas storage tank, and then transported to the SCR denitration system to provide the required reducing agent for flue gas denitration.

[0028] Preferably, the step S1 further comprises:

[0029] Step S11: adding a certain amount of inhibitor to the urea dissolution module to prevent crystallization or precipitation of the urea solution during storage and transportation;

[0030] Step S12: Regularly clean and maintain the urea dissolution module and the urea hydrolysis module to ensure the normal operation of the system and extend the service life;

[0031] Step S13: The operator can adjust the type and dosage of the inhibitor according to actual needs to achieve the best inhibitory effect.

[0032] Preferably,

[0033] The step S3 comprises:

[0034] Step S31: the intelligent control module monitors the temperature, pressure and flow parameters of the urea dissolution module, the urea hydrolysis module and the steam heating module in real time through the sensor module, and sends the monitoring data to the controller;

[0035] Step S32: the controller controls the actuator according to the monitoring data to adjust the operating parameters of the system, the operating parameters including heating temperature, pressure and flow rate, to ensure the stability and efficiency of the hydrolysis reaction;

[0036] In step S4, when the intelligent control module detects a system failure or abnormality, it immediately sends out an alarm signal and automatically takes emergency measures, such as shutting down the steam heating module, stopping the delivery of urea solution, etc., to prevent the failure from expanding or causing a safety accident.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an automated control system and method for urea hydrolysis to produce ammonia, which realizes the automation and precision control of the urea hydrolysis to produce ammonia process by integrating a urea dissolution module, a urea hydrolysis module, a steam heating module, a condensation temperature control module and an intelligent control module. The urea dissolution module is responsible for dissolving urea granules into a urea solution of a certain concentration to provide raw materials for the hydrolysis reaction. The urea hydrolysis module uses a hydrolysis ammonia generator to hydrolyze the urea solution to produce ammonia and carbon dioxide. The steam heating module provides the required heat for the hydrolysis reaction to ensure the smooth progress of the reaction. The condensation temperature control module reduces the temperature when the reaction temperature is too high to ensure the stable operation of the system. The intelligent control module monitors the operating status of each system in real time, accurately controls the actuator, and realizes the intelligent management of the system. This system has a compact structure and complete functions, and can significantly improve the efficiency and product quality of urea hydrolysis to produce ammonia, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a front view schematic diagram of the automatic control system for producing ammonia by urea hydrolysis of the present invention;

[0040] Figure 2 It is a front sectional schematic diagram of the feeding control mechanism of the present invention;

[0041] Figure 3 yes Figure 2 A is an enlarged schematic diagram of the local structure at center A;

[0042] Figure 4 The present invention is a flow chart of the automated control method for producing ammonia by urea hydrolysis.

[0043] Reference numerals:

[0044] 1. Bottom plate; 2. Hydrolysis ammonia system; 201. Hydrolysis ammonia generator; 202. Dissolving and stirring tank; 203. Liquid supply pipe; 204. Liquid supply pump; 205. Water storage tank; 3. Steam heating module; 301. Steam generator; 302. Steam supply main pipe; 303. Heating pipe network; 304. First solenoid valve; 4. Condensation temperature control module; 401. Cooling water tank; 402. Water supply circulation pump; 403. Water supply pipe; 404. Water supply main pipe; 405. Condensation pipe network; 406. Second solenoid valve; 407. Return pipe; 5. Feeding control mechanism; 501. Feeding pipe; 502. Conical bucket; 503. Pretreatment box; 504. Grinding roller; 505. Grinding electric machine; 506, cover plate; 507, weighing switch mechanism; 5071, bearing plate; 5072, bar frame; 5073, vertical rod; 5074, cross bar; 5075, adjusting cone; 5076, rubber ring; 5077, elastic member; 5078, horizontal plate; 5079, weighing sensor; 6, sliding drive mechanism; 601, screw seat; 602, lifting screw; 603, lifting motor; 604, sleeve; 605, L-shaped push rod; 7, urea dissolution module; 8, reaction tank body; 801, recovery pipeline; 802, air outlet pipeline; 803, air storage box; 804, reflux port; 805, sewage outlet; 806, catalyst layer; 807, reflux pump. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides the following embodiments

[0049] Example 1

[0050] The embodiment of the present invention provides an automatic control system and method for producing ammonia by urea hydrolysis, such as Figure 1 As shown, an automatic control system for urea hydrolysis to produce ammonia includes: a urea hydrolysis to produce ammonia system, the urea hydrolysis to produce ammonia system includes: a urea dissolving module 7, including a dissolving and stirring tank 202 and a water storage tank, used to dissolve urea granules into a urea solution of a certain concentration; a urea hydrolysis module, including a hydrolysis ammonia generator 201, used to hydrolyze the urea solution to produce ammonia and carbon dioxide; a steam heating module 3, used to provide the required heat for the urea hydrolysis reaction; a condensation temperature control module 4, used to reduce the reaction temperature when the urea hydrolysis reaction temperature is too high;

[0051] The intelligent control module is electrically connected to the urea dissolution module 7, the urea hydrolysis module, the steam heating module 3, and the condensation temperature control module 4 respectively;

[0052] Among them, the intelligent control module includes a sensor module, a controller and an actuator. The sensor module is used to monitor the operating status of the urea dissolution module, the urea hydrolysis module and the steam heating module in real time; the controller controls the actuator according to the monitoring data of the sensor module to realize intelligent and precise control of the system.

[0053] The working principle and beneficial effects of the above technical solution are as follows: the urea hydrolysis ammonia production automation control system provided by the present invention realizes the automation and precision control of the urea hydrolysis ammonia production process by integrating the urea dissolution module 7, the urea hydrolysis module, the steam heating module 3, the condensation temperature control module 4 and the intelligent control module. The urea dissolution module 7 is responsible for dissolving urea granules into a urea solution of a certain concentration to provide raw materials for the hydrolysis reaction. The urea hydrolysis module uses the hydrolysis ammonia generator 201 to hydrolyze the urea solution to produce ammonia and carbon dioxide. The steam heating module 3 provides the required heat for the hydrolysis reaction to ensure the smooth progress of the reaction. The condensation temperature control module 4 reduces the temperature when the reaction temperature is too high to ensure the stable operation of the system. The intelligent control module monitors the operating status of each system in real time, accurately controls the actuator, and realizes the intelligent management of the system. This system has a compact structure and complete functions, can significantly improve the efficiency and product quality of urea hydrolysis ammonia production, and reduce production costs.

[0054] Example 2

[0055] On the basis of Example 1, Figure 1-Figure 3 As shown, the intelligent control module includes: a data acquisition unit, a data processing unit and a remote control unit;

[0056] A data acquisition unit, used to monitor the operating data of the urea dissolution module 7, the urea hydrolysis module and the steam heating module 3 in real time;

[0057] A data processing unit is used to process and analyze the data collected by the data collection unit to obtain the operating status and fault information of the system;

[0058] The remote control unit is used to receive remote control instructions and remotely control the urea dissolution module 7 , the urea hydrolysis module, the steam heating module 3 and the condensation temperature control module 4 .

[0059] The intelligent control module also includes:

[0060] Energy-saving optimization unit, used to analyze and optimize the energy consumption of the system according to the real-time monitoring data of the data acquisition unit, so as to reduce the operating cost of the system;

[0061] The energy-saving optimization unit includes: an energy consumption monitoring subunit and an energy consumption control subunit;

[0062] Energy consumption monitoring subunit, used to monitor the energy consumption data of the system in real time, including electrical energy and thermal energy;

[0063] The energy consumption control subunit dynamically adjusts the operating parameters of the system according to the data of the energy consumption monitoring subunit to minimize the energy consumption.

[0064] The working principle and beneficial effects of the above technical solution are as follows: On the basis of Example 1, the present invention further adds a data acquisition unit, a data processing unit, a remote control unit, and an energy-saving optimization unit. The data acquisition unit is responsible for collecting system operation data and providing an analysis basis for the data processing unit. The data processing unit processes and analyzes the collected data to obtain the operating status and fault information of the system, and provides decision support for intelligent control. The remote control unit enables users to remotely monitor and control the system, thereby improving the flexibility and convenience of the system. The energy-saving optimization unit monitors energy consumption data in real time and dynamically adjusts the system operating parameters, thereby minimizing energy consumption and reducing operating costs. These newly added modules make the system more intelligent, more precise in control, and more energy-efficient in operation.

[0065] Example 3

[0066] On the basis of Example 1, Figure 1-Figure 3 As shown, the urea hydrolysis module includes: a bottom plate 1, a hydrolysis ammonia maker 201; the hydrolysis ammonia maker 201, the right end output port of the dissolving and stirring tank 202 is fixedly connected to the top of the hydrolysis ammonia maker 201 through a liquid supply pipe 203, and a liquid supply water pump is fixedly installed on the liquid supply pipe 203;

[0067] The hydrolysis ammonia generator 201 includes: a reaction tank body 8, the reaction tank body 8 is fixedly installed on the top of the bottom plate 1 along the left and right direction, the top of the right side of the reaction tank body 8 is fixedly connected to an air outlet pipe 802, and the air outlet pipe 802 is fixedly connected to an air storage box 803. A pair of reflux ports 804 are fixedly provided at intervals in the upper and lower right side walls of the reaction tank body 8, and a reflux pump 807 is fixedly connected between the upper and lower reflux ports 804. The center of the interior of the reaction tank body 8 is fixedly connected to a catalyst layer 806 in a horizontally reverse direction.

[0068] The reflux port 804 is used to reflux part of the gas and liquid produced by the hydrolysis reaction to the hydrolysis ammonia generator 201 to improve the efficiency of the hydrolysis reaction and the yield of ammonia;

[0069] The sewage outlet 805 is used to discharge the waste liquid and waste gas generated by the hydrolysis reaction;

[0070] The catalyst layer 806 is used to accelerate the hydrolysis reaction of the urea solution and improve the yield and purity of ammonia. The catalyst layer 806 is composed of one or more catalysts that can catalyze the hydrolysis reaction of urea, and the type and amount of the catalyst can be adjusted according to actual needs.

[0071] The working principle and beneficial effects of the above technical solution are as follows: the urea hydrolysis module of the present invention refluxes part of the gas and liquid produced by the hydrolysis reaction to the hydrolysis ammonia generator 201 through the reflux port 804, thereby improving the efficiency of the hydrolysis reaction and the yield of ammonia. At the same time, the sewage outlet 805 is used to discharge the waste liquid and waste gas produced by the hydrolysis reaction, thereby ensuring the cleanliness and environmental protection of the system. The provision of the catalyst layer 806 accelerates the hydrolysis reaction of the urea solution and improves the yield and purity of ammonia. This design makes the urea hydrolysis process more efficient and environmentally friendly, and the type and amount of the catalyst can be adjusted according to actual needs, with high flexibility and adaptability.

[0072] Example 4

[0073] On the basis of Example 1, Figure 1-Figure 3 As shown, the steam heating module 3 includes: a steam generator 301, the steam generator 301 is fixedly installed on the bottom plate 1, the right end of the steam generator 301 is fixedly connected to the steam supply main pipe 302 along the front-to-back direction, and the steam supply main pipe 302 is fixedly connected to a plurality of groups of heating pipe networks 303 at equal intervals in front and back, and the heating pipe networks 303 are all located inside the reaction tank body 8 along the left-right direction, and a first solenoid valve 304 is fixedly installed on the pipe at the connection between each group of heating pipe networks 303 and the steam supply main pipe 302, and the right end of each group of heating pipe networks 303 penetrates downwardly through the bottom wall of the reaction tank body 8 and is fixedly connected to the recovery pipe 801, and the recovery pipe 801 is fixedly connected to the recovery port of the steam generator 301;

[0074] The condensation temperature control module 4 includes: a cooling water tank 401, the cooling water tank 401 is fixedly installed on the bottom plate 1 on the right side of the hydrolysis ammonia producer 201, the top of the cooling water tank 401 is fixedly connected to a water supply circulation pump 402, the outlet of the water supply circulation pump 402 is connected to a water supply pipe 404 in the left and right directions through a water supply pipe 403, the water supply pipe 404 is fixedly connected to a plurality of groups of condensation pipe networks 405 at equal intervals on the left and right, the condensation pipe networks 405 are all located in the top of the reaction tank body 8, and a second solenoid valve 406 is installed at the connection between each group of condensation pipe networks 405 and the water supply pipe 404.

[0075] The working principle and beneficial effects of the above technical solution are as follows: Working principle:

[0076] Steam heating module 3: The steam generated by the steam generator 301 is transported to the hydrolysis ammonia generator 201 through a pipeline to provide the required heat for the hydrolysis reaction. The temperature, pressure and other parameters of the steam heating module 3 can be accurately adjusted by the intelligent control module. At the same time, the design of the heating pipe network 303 enables the steam to be evenly distributed in the reaction tank 8, thereby improving the heating efficiency and reaction speed.

[0077] Condensation temperature control module 4: When the hydrolysis reaction temperature is too high, the condensation temperature control module 4 is started. The cooling water in the cooling water tank 401 is transported to the condensation pipe network 405 through the water supply circulation pump 402 to cool the hydrolysis ammonia generator 201. The design of the condensation pipe network 405 allows the cooling water to be evenly distributed in the top of the reaction tank body 8, thereby improving the cooling efficiency and the cooling speed.

[0078] Beneficial effects:

[0079] The cooperation of the steam heating module 3 and the condensation temperature control module 4 enables the hydrolysis reaction to be carried out within a suitable temperature range, thereby improving the reaction efficiency and the yield of ammonia.

[0080] The design of the heating pipe network 303 and the condensing pipe network 405 improves the heating and cooling efficiency, and reduces the energy consumption and operating costs;

[0081] Each of the first solenoid valve 304 and the second solenoid valve 406 can be internally controlled to be opened and closed, thereby achieving precise adjustment of the temperature of a fixed point area.

[0082] The steam heating module 3 and the condensation temperature control module 4 of the present invention achieve accurate regulation of the urea hydrolysis reaction temperature by accurately controlling the opening and closing of the heating pipe network 303 and the condensation pipe network 405. The steam heating module 3 provides a stable heat source for the hydrolysis reaction, while the condensation temperature control module 4 timely reduces the temperature when the reaction temperature is too high, thereby ensuring the stable operation of the system. This design not only improves the efficiency and product quality of urea hydrolysis to produce ammonia, but also reduces energy consumption and operating costs.

[0083] Example 5

[0084] On the basis of Example 1 and Example 3, Figure 1-Figure 4 As shown, a group of feeding control mechanisms 5 are fixedly provided on the top of the dissolving and stirring tank 202 and the hydrolysis ammonia making device 201. The feeding control mechanism 5 on the top of the dissolving and stirring tank 202 includes: a feeding pipe 501, a vertical feeding pipe 501 is fixedly installed on the top of the dissolving and stirring tank 202, the top of the feeding pipe 501 is fixedly connected to a conical bucket 502, a pretreatment box 503 is fixedly installed on the top of the conical bucket 502, a pair of grinding rollers 504 along the left and right directions are fixedly provided in the center of the pretreatment box 503 symmetrically front and back, the grinding rollers 504 are rotatably connected to the left and right side walls of the pretreatment box 503, the right end of each grinding roller 504 is respectively fixedly connected to the output shaft end of a grinding motor 505, the grinding motor 505 is fixedly connected to the right outer wall of the pretreatment box 503, and the top of the left side wall of the pretreatment box 503 is hingedly connected to a cover plate 506; two groups of weighing switch mechanisms 507 symmetrically provided at the connection between the bottom of the pretreatment box 503 and the conical bucket 502.

[0085] The weighing switch mechanism 507 on the left side includes: a bearing plate 5071, a vertical movable opening is opened on the left side wall of the pretreatment box 503, the bearing plate 5071 is rotatably connected in the movable opening, the left end of the bearing plate 5071 is fixedly connected to a strip frame 5072 along the left and right directions, the strip frame 5072 is slidably hinged in the top of a vertical rod 5073, the bottom end of the vertical rod 5073 is rotatably hinged to a horizontal rod 5074 along the left and right directions, the horizontal rod 5074 slides up and down and penetrates the conical bucket 502, the horizontal rod The right end of the rod 5074 is fixedly connected to the vertical adjustment cone 5075, and a rubber ring 5076 is provided on the top of the adjustment cone 5075; a plurality of elastic members 5077 are symmetrically distributed on the bearing plate 5071, and the top of the elastic member 5077 is fixedly connected to the horizontal plate 5078, and the bottom of the horizontal plate 5078 is fixedly connected to a plurality of weighing sensors 5079; the bottom end of the adjustment cone 5075 is fixedly connected to the sliding drive mechanism 6, and the sliding drive mechanism 6 is used to provide a driving force for the adjustment cone 5075 to slide up and down;

[0086] The sliding drive mechanism 6 includes: a screw seat 601, a vertical screw seat 601 is fixedly installed on the right side wall of the feed pipe 501, a vertical lifting screw 602 is rotatably connected inside the screw seat 601, an output shaft end of a lifting motor 603 is fixedly installed on the top of the lifting screw 602, a sleeve 604 is threadedly connected on the lifting screw 602, an L-shaped push rod 605 is fixedly connected to the left end of the sleeve 604, the L-shaped push rod 605 slides up and down and passes through the right side wall of the feed pipe 501, and the top of the L-shaped push rod 605 is fixedly connected to the bottom end of the adjusting cone 5075.

[0087] The working principle and beneficial effects of the above technical solution are as follows: Working principle:

[0088] Feeding control mechanism 5: both the dissolving and stirring tank 202 and the hydrolysis ammonia generator 201 are provided with a feeding control mechanism 5. When the feeding control mechanism 5 is working, the operator adds urea or additives into the pretreatment box, and the front and rear grinding motors 505 are operated relative to each other, so that the front and rear grinding rollers 504 squeeze and grind the urea blocks into fine particles, and then the fine particles fall onto the horizontal plate 5078, and the weight is recorded by the weighing sensor 5079. When the weight reaches the preset value, the grinding motor 505 stops; then the sliding drive mechanism 6 works, and the lifting motor 603 runs to rotate the lifting screw 602, and the lifting screw 602 rotates to drive the sliding sleeve 604 and the L-shaped push rod 604 to rotate. The rod 605 simultaneously pushes the adjusting cone 5075 upward to slide upward, and the upward sliding of the adjusting cone 5075 drives the horizontal rod 5074 to push the vertical rod 5073 to move upward, and the vertical rod 5073 lifts the bar frame 5072, and the bar frame 5072 rotates the left and right side supporting plates 5071 downward to open through the lever principle. The adjusting cone 5075 and the rubber ring 5076 can ensure that the main feed port is blocked during the grinding and weighing steps to prevent water vapor from moving upward and causing urea or additives to agglomerate when encountering water vapor, thereby ensuring the accuracy of weighing and the accuracy of the added amount.

[0089] Feed pipe 501: used to transport urea granules to the pretreatment box 503. A grinding roller 504 is arranged inside the pretreatment box 503 to grind the urea granules into fine particles to improve the dissolution efficiency.

[0090] Weighing switch mechanism 507: used to accurately measure the ground urea granules. When the weight of the urea granules reaches a preset value, the weighing switch mechanism 507 automatically closes the feed port to avoid overfeeding.

[0091] Sliding drive mechanism 6: used to adjust the up and down sliding position of the adjusting cone 5075, so as to control the adding speed of the material. By adjusting the operating parameters of the sliding drive mechanism 6, the adding speed of the urea granules can be accurately controlled.

[0092] Beneficial effects:

[0093] The design of the feeding control mechanism 5 realizes accurate metering and automatic feeding of urea granules, thereby improving dissolution efficiency and product quality.

[0094] The cooperation between the weighing switch mechanism 507 and the sliding drive mechanism 6 makes the feeding process more accurate and efficient.

[0095] Example 6

[0096] On the basis of Examples 1-4, Figure 4 As shown, a method for automatically controlling urea hydrolysis to produce ammonia is applied to the automatic control system for urea hydrolysis to produce ammonia described above, and is characterized in that it includes the following steps:

[0097] Step S1: adding urea granules and deionized water into the urea dissolution module 7 to prepare a urea solution of a certain concentration;

[0098] Step S2: sending the urea solution into the urea hydrolysis module, and performing a hydrolysis reaction under the action of the steam heating module 3;

[0099] Step S3: Intelligently and precisely control the hydrolysis reaction process through the intelligent control module, and monitor the operating status and fault information of the system in real time;

[0100] Step S4: adjusting the operating parameters of the intelligent control module according to the real-time monitoring data to ensure the stability and efficiency of the hydrolysis reaction;

[0101] Step S5: The ammonia and carbon dioxide generated by the hydrolysis reaction are collected into the gas storage tank 803, and then transported to the SCR denitration system to provide the required reducing agent for flue gas denitration.

[0102] Preferably, the step S1 further comprises:

[0103] Step S11: adding a certain amount of inhibitor into the urea dissolution module 7 to prevent crystallization or precipitation of the urea solution during storage and transportation;

[0104] Step S12: Regularly clean and maintain the urea dissolution module 7 and the urea hydrolysis module to ensure the normal operation of the system and extend its service life;

[0105] Step S13: The operator can adjust the type and dosage of the inhibitor according to actual needs to achieve the best inhibitory effect.

[0106] The step S3 comprises:

[0107] Step S31: the intelligent control module monitors the temperature, pressure and flow parameters of the urea dissolution module 7, the urea hydrolysis module and the steam heating module 3 in real time through the sensor module, and sends the monitoring data to the controller;

[0108] Step S32: the controller controls the actuator according to the monitoring data to adjust the operating parameters of the system, the operating parameters including heating temperature, pressure and flow rate, to ensure the stability and efficiency of the hydrolysis reaction;

[0109] In step S4, when the intelligent control module detects a system failure or abnormality, it immediately sends out an alarm signal and automatically takes emergency measures, such as shutting down the steam heating module 3, stopping the delivery of urea solution, etc., to prevent the failure from expanding or causing a safety accident.

[0110] The working principle and beneficial effects of the above technical scheme are as follows: the automatic control method for urea hydrolysis to ammonia provided by the present invention realizes comprehensive monitoring and precise control of the urea hydrolysis to ammonia process through a series of steps. First, urea granules and desalted water are added to the urea dissolution module 7 to form a urea solution of a certain concentration. Then, the urea solution is sent to the urea hydrolysis module for hydrolysis reaction, and the steam heating module 3 is used to provide heat. The intelligent control module monitors the operating status and fault information of each system in real time, and adjusts the operating parameters according to the monitoring data to ensure the stability and efficiency of the hydrolysis reaction. Finally, the ammonia and carbon dioxide generated by the hydrolysis reaction are collected in the gas storage tank 803 and transported to the SCR denitration system to provide the required reducing agent for flue gas denitration. In addition, the present invention also provides steps such as adding inhibitors, system cleaning and maintenance to further improve the stability and service life of the system. This control method not only improves the efficiency and product quality of urea hydrolysis to ammonia, but also reduces production costs and energy consumption, and has high economic value and environmental significance.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic control system for producing ammonia by urea hydrolysis, characterized in that: include: The urea hydrolysis ammonia production system comprises: a urea dissolution module (7), comprising a dissolution stirring tank (202) and a water storage tank, and is used to dissolve urea granules into a urea solution of a certain concentration; The urea hydrolysis module comprises a hydrolysis ammonia generator (201) for hydrolyzing a urea solution to produce ammonia and carbon dioxide; a steam heating module (3) for providing the heat required for the urea hydrolysis reaction; and a condensation temperature control module (4) for reducing the reaction temperature when the urea hydrolysis reaction temperature is too high. The intelligent control module is electrically connected to the urea dissolution module (7), the urea hydrolysis module, the steam heating module (3), and the condensation temperature control module (4), respectively.

2. The automatic control system for producing ammonia by urea hydrolysis according to claim 1, characterized in that: The intelligent control module includes: a data acquisition unit, a data processing unit and a remote control unit; A data acquisition unit, used for real-time monitoring of the operating data of the urea dissolution module (7), the urea hydrolysis module and the steam heating module (3); A data processing unit is used to process and analyze the data collected by the data collection unit to obtain the operating status and fault information of the system; The remote control unit is used to receive remote control instructions and remotely control the urea dissolution module (7), the urea hydrolysis module, the steam heating module (3) and the condensation temperature control module (4).

3. The automatic control system for producing ammonia by urea hydrolysis according to claim 2, characterized in that: The intelligent control module also includes: Energy-saving optimization unit, used to analyze and optimize the energy consumption of the system according to the real-time monitoring data of the data acquisition unit, so as to reduce the operating cost of the system; The energy-saving optimization unit includes: an energy consumption monitoring subunit and an energy consumption control subunit; Energy consumption monitoring subunit, used to monitor the energy consumption data of the system in real time, including electrical energy and thermal energy; The energy consumption control subunit dynamically adjusts the operating parameters of the system according to the data of the energy consumption monitoring subunit to minimize the energy consumption.

4. The automatic control system for producing ammonia by urea hydrolysis according to claim 1, characterized in that: The urea hydrolysis module comprises: a bottom plate (1), a hydrolysis ammonia generator (201); the hydrolysis ammonia generator (201), the right end output port of the dissolution stirring tank (202) is fixedly connected to the top of the hydrolysis ammonia generator (201) through a liquid supply pipe (203), and a liquid supply water pump is fixedly installed on the liquid supply pipe (203); The hydrolysis ammonia generator (201) comprises: a reaction tank body (8), the reaction tank body (8) being fixedly mounted on the top of the bottom plate (1) along the left-right direction, the top of the right side of the reaction tank body (8) being fixedly connected to an air outlet pipe (802), the air outlet pipe (802) being fixedly connected to an air storage box (803), a pair of reflux ports (804) being fixedly provided at intervals at the upper and lower sides of the right side wall of the reaction tank body (8), a reflux pump (807) being fixedly connected between the upper and lower reflux ports (804), and a catalyst layer (806) being fixedly connected in a horizontally reverse direction at the center of the interior of the reaction tank body (8).

5. The automatic control system for producing ammonia by urea hydrolysis according to claim 4, characterized in that: The steam heating module (3) comprises: a steam generator (301), the steam generator (301) is fixedly mounted on the bottom plate (1), the right end of the steam generator (301) is fixedly connected to a steam supply pipe (302) along the front-to-back direction, the steam supply pipe (302) is fixedly connected to a plurality of groups of heating pipe networks (303) at equal intervals in the front-to-back direction, the heating pipe networks (303) are all located inside the reaction tank body (8) along the left-right direction, a first solenoid valve (304) is fixedly mounted on the pipe at the connection between each group of heating pipe networks (303) and the steam supply pipe (302), the right end of each group of heating pipe networks (303) passes downward through the bottom wall of the reaction tank body (8) and is fixedly connected to a recovery pipe (801), and the recovery pipe (801) is fixedly connected to the recovery port of the steam generator (301); The condensation temperature control module (4) comprises: a cooling water tank (401), the cooling water tank (401) is fixedly installed on the bottom plate (1) at the right side of the hydrolysis ammonia producer (201), the top of the cooling water tank (401) is fixedly connected to a water supply circulation pump (402), the outlet of the water supply circulation pump (402) is connected to a water supply pipe (404) in the left and right directions through a water supply pipe (403), the water supply pipe (404) is fixedly connected to a plurality of groups of condensation pipe networks (405) at equal intervals on the left and right, the condensation pipe networks (405) are all located in the top of the reaction tank body (8), and a second solenoid valve (406) is installed at the connection point between each group of condensation pipe networks (405) and the water supply pipe (404).

6. The automatic control system for producing ammonia by urea hydrolysis according to claim 1, characterized in that: A group of feeding control mechanisms (5) are fixedly arranged on the top of the dissolving and stirring tank (202) and the hydrolysis ammonia making device (201). The feeding control mechanism (5) on the top of the dissolving and stirring tank (202) comprises: a feeding pipe (501), a vertical feeding pipe (501) is fixedly installed on the top of the dissolving and stirring tank (202), the top of the feeding pipe (501) is fixedly connected to a conical bucket (502), a pretreatment box (503) is fixedly installed on the top of the conical bucket (502), and a pair of left and right symmetrically fixedly arranged in the center of the pretreatment box (503) are provided. The grinding roller (504) is rotatably connected to the left and right side walls of the pretreatment box (503); the right end of each grinding roller (504) is fixedly connected to the output shaft end of a grinding motor (505); the grinding motor (505) is fixedly connected to the right outer wall of the pretreatment box (503); the top of the left wall of the pretreatment box (503) is hingedly connected to the cover plate (506); two groups of weighing switch mechanisms (507) are symmetrical at the bottom of the pretreatment box (503) and the connection between the conical bucket (502).

7. The automatic control system for producing ammonia by urea hydrolysis according to claim 6, characterized in that: The weighing switch mechanism (507) on the left side includes: a bearing plate (5071); a vertical movable opening is opened on the left side wall of the pretreatment box (503); the bearing plate (5071) is rotatably connected in the movable opening; the left end of the bearing plate (5071) is fixedly connected to a strip frame (5072) along the left and right directions; a top end of a vertical rod (5073) is slidably hinged in the strip frame (5072); a bottom end of the vertical rod (5073) is rotatably hinged to a horizontal rod (5074) along the left and right directions; the horizontal rod (5074) slides up and down and penetrates the conical bucket (502); the horizontal rod (5074) The right end of the adjusting cone (5074) is fixedly connected to a vertical adjusting cone (5075), and a rubber ring (5076) is provided on the top of the adjusting cone (5075); a plurality of elastic members (5077) are symmetrically distributed on the bearing plate (5071), and the top of the elastic member (5077) is fixedly connected to a horizontal plate (5078), and the bottom of the horizontal plate (5078) is fixedly connected to a plurality of weighing sensors (5079); the bottom end of the adjusting cone (5075) is fixedly connected to a sliding drive mechanism (6), and the sliding drive mechanism (6) is used to provide a driving force for the adjusting cone (5075) to slide up and down.

8. An automated control method for producing ammonia by urea hydrolysis, applied to an automated control system for producing ammonia by urea hydrolysis as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: adding urea granules and deionized water into a urea dissolution module (7) to prepare a urea solution of a certain concentration; Step S2: feeding the urea solution into a urea hydrolysis module, and performing a hydrolysis reaction under the action of a steam heating module (3); Step S3: Intelligently and precisely control the hydrolysis reaction process through the intelligent control module, and monitor the operating status and fault information of the system in real time; Step S4: adjusting the operating parameters of the intelligent control module according to the real-time monitoring data to ensure the stability and efficiency of the hydrolysis reaction; Step S5: The ammonia and carbon dioxide produced by the hydrolysis reaction are collected into a gas storage tank (803), and then transported to the SCR denitrification system to provide the required reducing agent for flue gas denitrification.

9. The method for automatically controlling urea hydrolysis to produce ammonia according to claim 8, characterized in that: The step S1 further comprises: Step S11: adding a certain amount of inhibitor to the urea dissolution module (7) to prevent crystallization or precipitation of the urea solution during storage and transportation; Step S12: regularly cleaning and maintaining the urea dissolution module (7) and the urea hydrolysis module to ensure the normal operation of the system and extend the service life; Step S13: The operator can adjust the type and dosage of the inhibitor according to actual needs to achieve the best inhibitory effect.

10. The method for automatically controlling urea hydrolysis to produce ammonia according to claim 9, characterized in that: The step S3 comprises: Step S31: the intelligent control module monitors the temperature, pressure and flow parameters of the urea dissolution module (7), the urea hydrolysis module and the steam heating module (3) in real time through the sensor module, and sends the monitoring data to the controller; Step S32: the controller controls the actuator according to the monitoring data to adjust the operating parameters of the system, the operating parameters including heating temperature, pressure and flow rate, to ensure the stability and efficiency of the hydrolysis reaction; In step S4, when the intelligent control module detects that a fault or abnormality occurs in the system, an alarm signal is immediately issued and emergency measures are automatically taken to shut down the steam heating module (3) and stop the delivery of the urea solution, so as to prevent the fault from expanding or causing a safety accident.

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