Temperature control heater for synthesis ammonia
By designing a temperature-controlled heater for synthetic ammonia, the methanol boiling temperature is controlled by using a methanol heating box and a pump, and steam is recovered through the condenser, the problem of difficult to control the low-load liquid ammonia heating temperature is solved, and stable and efficient liquid ammonia heating is achieved.
Patent Information
- Application Number
- CN202421154956.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-05-24
AI Technical Summary
When the low-load liquid ammonia volume is small, it is difficult for existing heaters to accurately control the liquid ammonia temperature, resulting in large temperature fluctuations and affecting normal production.
A temperature-controlled heater for synthetic ammonia is designed to control the boiling temperature of methanol through a combination of a methanol heating box and a pump, maintain a stable pressure to heat liquid ammonia, and recover methanol steam through a condenser to reduce frequent filling.
It realizes stable control of liquid ammonia temperature under low load conditions, reduces temperature fluctuations, improves heating accuracy and efficiency, and saves costs.
Smart Images
Figure CN222799274U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid ammonia heating, in particular to a temperature-controlled heater for synthetic ammonia. Background Art
[0002] The normal pressure of liquid ammonia produced is 2.5MPa and the temperature is 28℃. After being produced by the synthesis process, it is sent to the liquid ammonia spherical tank (operating pressure 2.5MPa, normal operating temperature 28℃), and then distributed to the subsequent processes that need liquid ammonia through the liquid ammonia spherical tank. When the output of liquid ammonia produced by the ammonia synthesis system is large and the subsequent processes cannot digest it in time, the liquid ammonia will be decompressed and cooled (to 0.1MPa, -33℃), and then the liquid ammonia in this state will be pressurized (0.4MPa, -33℃) by a pump and sent to the liquid ammonia atmospheric pressure storage tank for storage. The state of liquid ammonia in the atmospheric pressure storage tank is (0.1MPa, -33℃). When the demand for liquid ammonia in the subsequent process increases, the liquid ammonia in the atmospheric pressure storage tank needs to be pressurized and heated before being sent to the subsequent required process.
[0003] When the amount of liquid ammonia is small at low load, it is difficult to accurately control the temperature of the liquid ammonia after the ammonia heater by the regulating valve on the steam pipeline because the amount of steam required is very small. It will also cause large temperature fluctuations in the outlet liquid ammonia, which brings great inconvenience to normal production. For this reason, we propose a temperature-controlled heater for synthetic ammonia. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a temperature-controlled heater for synthesizing ammonia. According to the saturated vapor pressure of methanol, the boiling temperature of methanol is controlled by controlling the pressure. By maintaining a certain pressure, liquid ammonia can be heated at a stable and reliable temperature, which can effectively solve the problems in the background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a temperature-controlled heater for synthetic ammonia, comprising a methanol heating box, wherein the methanol steam exhaust hole of the methanol heating box is connected to the air inlet hole of the vacuum pump, the exhaust hole of the vacuum pump is connected to the air inlet of the heat pipe in the heat exchanger, the vacuum pump is used to extract the gas inside the methanol heating box, and control the internal air pressure of the methanol heating box to be negative pressure, the air outlet of the heat pipe in the heat exchanger is connected to a methanol condensation mechanism, and the methanol condensation mechanism is used to recover methanol, the cold pipe liquid inlet of the heat exchanger is connected to a liquid nitrogen box, and the liquid nitrogen box is used to store low-temperature liquid nitrogen, a heating pipe is arranged inside the liquid nitrogen box, the lower end of the heating pipe is connected to a heat source mechanism, and the heat source mechanism is used to provide heat required for heating methanol, and the upper end of the heating pipe is connected to a steam condensation mechanism, and the steam condensation mechanism is used to recover steam.
[0006] A vacuum pump is designed so that the gas pressure in the methanol heating box can be adjusted by the power of the vacuum pump, so that the methanol heating box enters a negative pressure state, thereby reducing the boiling temperature of methanol to below fifty-seven degrees Celsius, thereby stabilizing the heating temperature. When the control device is working, the vacuum pump is controlled to work through an external control switch group, so that the gas inside the methanol heating box is continuously extracted by the vacuum pump, thereby reducing the gas pressure inside the methanol heating box. Methanol is placed in the methanol heating box and heated by a heat source mechanism, so that the methanol boils at a low temperature. The boiling methanol vapor enters the heat pipe of the heat exchanger, thereby heating the liquid nitrogen in the heat exchanger. The methanol vapor after heat exchange is condensed by a methanol condensation mechanism and then recovered.
[0007] Furthermore, the methanol condensation mechanism includes a first condenser, the air outlet of the heat pipe in the heat exchanger is connected to the methanol vapor inlet at the top of the first condenser, the methanol liquid outlet at the bottom of the first condenser is connected to a methanol tank, and the methanol liquid outlet of the methanol tank is connected to the methanol liquid inlet of the methanol heating box.
[0008] The methanol vapor that has completed the heat exchange is condensed by the first condenser, so that the methanol vapor is converted into liquid again and flows back into the methanol tank for recovery without frequent refilling.
[0009] Furthermore, the heat source mechanism includes an evaporation box, the steam inlet of the methanol heating box is connected to the steam exhaust hole of the evaporation box, and a heating rod is fixedly connected to the inside of the evaporation box.
[0010] The water is heated into water vapor by the heating rod, and the water vapor enters the heating tube to heat the methanol in the methanol heating box.
[0011] Furthermore, the steam condensation mechanism includes a water tank, which is arranged on the side of the methanol heating box, the water outlet of the water tank is connected to the water inlet of the evaporation box, the water inlet of the water tank is connected to the drain port of the second condenser, and the steam inlet of the second condenser is connected to the upper end of the heating tube.
[0012] A water tank is designed to store water, and a second condenser is designed to condense and recover steam used for heating, thereby avoiding frequent refilling, thereby streamlining the work process and facilitating operation.
[0013] Furthermore, the temperature-controlled heater also includes an opening and closing valve, and the opening and closing valve is installed between the methanol liquid outlet of the methanol box and the methanol liquid inlet of the methanol heating box.
[0014] Design an opening and closing valve to control the opening and closing of the methanol tank.
[0015] Compared with the prior art, the beneficial effects of the utility model are: the temperature-controlled heater for synthesizing ammonia has the following advantages:
[0016] 1. Design a vacuum pump so that the air pressure in the methanol heating box can be adjusted by the power of the vacuum pump, so that the methanol heating box enters a negative pressure state, thereby reducing the boiling temperature of methanol to below 57 degrees Celsius, thereby stabilizing the heating temperature.
[0017] 2. The methanol vapor that has completed the heat exchange is condensed through the first condenser, so that the methanol vapor is converted into liquid and flows back into the methanol tank, thereby recovering the liquid and saving costs;
[0018] 3. Design the second condenser to condense and recover the steam used for heating, thus avoiding frequent refilling, thus streamlining the work process and facilitating operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the structure of the utility model
[0020] Figure 2 This is a schematic diagram of the structure of the methanol heating box of the utility model
[0021] Figure 3 This is a schematic diagram of the internal structure of the methanol heating box of the utility model
[0022] Figure 4 This is a schematic diagram of the internal structure of the evaporator box of the utility model.
[0023] In the figure: 1 heat exchanger, 2 liquid nitrogen box, 3 methanol heating box, 4 heating tube, 5 vacuum pump, 6 first condenser, 7 methanol box, 8 opening and closing valve, 9 water tank, 10 evaporation box, 11 heating rod, 12 second condenser. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] See also Figure 1-4The present embodiment provides a technical solution: a temperature-controlled heater for synthetic ammonia, comprising a methanol heating box 3, wherein the exhaust hole of the methanol steam in the methanol heating box 3 is connected to the air inlet hole of the vacuum pump 5, the exhaust hole of the vacuum pump 5 is connected to the air inlet of the heat pipe in the heat exchanger 1, the vacuum pump 5 is used to extract the gas inside the methanol heating box 3, and control the internal air pressure of the methanol heating box 3 to be negative pressure, the air outlet of the heat pipe in the heat exchanger 1 is connected to the methanol condensation mechanism, the methanol condensation mechanism is used to recover methanol, the cold pipe inlet of the heat exchanger 1 is connected to the liquid nitrogen box 2, the liquid nitrogen box 2 is used to store low-temperature liquid nitrogen, a heating tube 4 is arranged inside the liquid nitrogen box 2, the lower end of the heating tube 4 is connected to the heat source mechanism, the heat source mechanism is used to provide the heat required for heating methanol, the upper end of the heating tube 4 is connected to the steam condensation mechanism, the steam condensation mechanism is used to recover the steam.
[0026] The vacuum pump 5 is designed so that the gas pressure in the methanol heating box 3 can be adjusted by the power of the vacuum pump 5, so that the methanol heating box 3 enters a negative pressure state, thereby reducing the boiling temperature of methanol to below fifty-seven degrees Celsius, thereby stabilizing the heating temperature. When the control device is working, the vacuum pump 5 is controlled to work through the external control switch group, so that the gas inside the methanol heating box 3 is continuously extracted by the vacuum pump 5, thereby reducing the gas pressure inside the methanol heating box 3. Methanol is placed in the methanol heating box 3, and then heated by the heat source mechanism, so that the methanol boils at a low temperature. The boiled methanol vapor enters the heat pipe of the heat exchanger 1, thereby heating the liquid nitrogen in the heat exchanger 1. The methanol vapor after heat exchange is condensed by the methanol condensation mechanism and then recovered.
[0027] The methanol condensation mechanism includes a first condenser 6, the heat pipe outlet in the heat exchanger 1 is connected to the methanol vapor inlet at the top of the first condenser 6, the methanol liquid outlet at the bottom of the first condenser 6 is connected to the methanol tank 7, and the methanol liquid outlet of the methanol tank 7 is connected to the methanol liquid inlet of the methanol heating tank 3.
[0028] The methanol vapor that has completed the heat exchange is condensed by the first condenser 6, so that the methanol vapor is converted into liquid again and flows back into the methanol tank 7, so as to be recovered without frequent refilling.
[0029] The heat source mechanism comprises an evaporation box 10 , the steam inlet of the methanol heating box 3 is connected to the steam exhaust hole of the evaporation box 10 , and a heating rod 11 is fixedly connected inside the evaporation box 10 .
[0030] The water is heated into water vapor by the heating rod 11 , and the water vapor enters the heating tube 4 to heat the methanol in the methanol heating box 3 .
[0031] The steam condensation mechanism includes a water tank 9. The water tank 9 is arranged on the side of the methanol heating box 3. The water outlet of the water tank 9 is connected to the water inlet of the evaporation box 10. The water inlet of the water tank 9 is connected to the drain port of the second condenser 12. The steam inlet of the second condenser 12 is connected to the upper end of the heating tube 4.
[0032] The water tank 9 is designed to store water, and the second condenser 12 is designed to condense and recover the steam used for heating, thereby avoiding frequent refilling, thereby streamlining the work process and facilitating operation.
[0033] The temperature-controlled heater also includes an opening and closing valve 8 , which is installed between the methanol liquid outlet of the methanol tank 7 and the methanol liquid inlet of the methanol heating tank 3 .
[0034] The opening and closing valve 8 is designed to control the opening and closing of the methanol tank 7.
[0035] The working principle of a temperature-controlled heater for synthetic ammonia provided by the utility model is as follows:
[0036] First, liquid nitrogen is transported to the cooling pipe in the heat exchanger 1, and then methanol is added to the methanol heating box 3, and then cold water is added to the evaporation box 10, and then the heating rod 11 is controlled by the external control switch group to heat, so that the cold water is converted into steam and enters the heating pipe 4 to heat the methanol. At this time, the vacuum pump 5 is controlled by the external control switch group to reduce the pressure in the methanol heating box 3, so that the methanol boils below fifty-seven degrees Celsius, and the generated methanol vapor enters the heat pipe and the liquid nitrogen in the cold pipe of the heat exchanger 1 for heat exchange, thereby heating the liquid nitrogen. After the heat exchange, the methanol vapor enters the first condenser 6 for condensation, and then flows back to the methanol tank 7. The water vapor that completes the heating work is condensed through the second condenser 12 and then flows back to the water tank 9.
[0037] It is worth noting that the heat exchanger 1 disclosed in the above embodiment adopts Lanzhou Lanshi heat exchanger, the first condenser 6 and the second condenser 12 adopt Lanzhou Lanshi condenser, the vacuum pump 5 adopts Dongguan Puli vacuum pump, and the heating rod 11 adopts Songtai electric heating rod. The vacuum pump 5 and the heating rod 11 are controlled by an external control switch group using the method commonly used in the prior art.
[0038] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A temperature-controlled heater for synthesizing ammonia, characterized in that: The invention comprises a methanol heating box (3), wherein a methanol steam exhaust hole of the methanol heating box (3) is connected to an air inlet hole of an exhaust pump (5), wherein the exhaust hole of the exhaust pump (5) is connected to an air inlet hole of a heat pipe in a heat exchanger (1), wherein the exhaust pump (5) is used to extract gas from the interior of the methanol heating box (3) and control the internal air pressure of the methanol heating box (3) to be a negative pressure, wherein an air outlet hole of the heat pipe in the heat exchanger (1) is connected to a methanol condensation mechanism, wherein the methanol condensation mechanism is used to recover methanol, wherein a cold pipe liquid inlet hole of the heat exchanger (1) is connected to a liquid nitrogen box (2), wherein the liquid nitrogen box (2) is used to store low-temperature liquid nitrogen, wherein a heating pipe (4) is arranged inside the liquid nitrogen box (2), wherein the lower end of the heating pipe (4) is connected to a heat source mechanism, wherein the heat source mechanism is used to provide heat required for heating methanol, and wherein the upper end of the heating pipe (4) is connected to a steam condensation mechanism, wherein the steam condensation mechanism is used to recover steam.
2. The temperature-controlled heater for synthesizing ammonia according to claim 1, characterized in that: The methanol condensation mechanism comprises a first condenser (6), the heat pipe outlet of the heat exchanger (1) is connected to the methanol vapor inlet at the top of the first condenser (6), the methanol liquid outlet at the bottom of the first condenser (6) is connected to a methanol tank (7), and the methanol liquid outlet of the methanol tank (7) is connected to the methanol liquid inlet of the methanol heating tank (3).
3. The temperature-controlled heater for synthesizing ammonia according to claim 2, characterized in that: The heat source mechanism comprises an evaporation box (10), the steam inlet of the methanol heating box (3) is connected to the steam exhaust hole of the evaporation box (10), and a heating rod (11) is fixedly connected to the inside of the evaporation box (10).
4. The temperature-controlled heater for synthesizing ammonia according to claim 3, characterized in that: The steam condensing mechanism comprises a water tank (9), the water tank (9) being arranged on the side of the methanol heating box (3), the water outlet of the water tank (9) being connected to the water inlet of the evaporation box (10), the water inlet of the water tank (9) being connected to the drain port of the second condenser (12), and the steam inlet of the second condenser (12) being connected to the upper end of the heating pipe (4).
5. The temperature-controlled heater for synthesizing ammonia according to claim 4, characterized in that: The temperature-controlled heater further comprises an opening and closing valve (8), and the opening and closing valve (8) is installed between the methanol liquid outlet of the methanol tank (7) and the methanol liquid inlet of the methanol heating tank (3).